CN102830255B - A kind of intelligent electric energy meter with electricity consumption malfunction monitoring defencive function - Google Patents
A kind of intelligent electric energy meter with electricity consumption malfunction monitoring defencive function Download PDFInfo
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Abstract
A kind of intelligent electric energy meter with electricity consumption malfunction monitoring defencive function; comprise computation chip, leakage current sample circuit, phase current sampling circuit, phase voltage sample circuit, central processor CPU, power module; low-voltage circuit breaker; leakage current sample circuit electrically connects described computation chip; computation chip and CPU electrically connect mutually; CPU electrically connects described low-voltage circuit breaker through a tripping operation output interface, and low-voltage circuit breaker electrically connects CPU through a state acquisition interface.A kind of electricity consumption malfunction monitoring and control method of intelligent electric energy meter are also provided.The invention has the beneficial effects as follows: provide reliable electricity consumption emergency protection to control power module; polytype electricity consumption fault alarm and protection are provided; realize the fault alarm to types such as power consumer voltage, electric current, power and emergency protection; prevention and isolated fault point; the economic loss prevented and reduce because the equipment failure of user's electric wiring causes and the generation of personal safety accident, and the reliability effectively improving low voltage electric network.
Description
Technical field
The present invention relates to low voltage electric network power measurement proterctive equipment field, particularly relate to a kind of intelligent electric energy meter with electricity consumption malfunction monitoring defencive function.
Background technology
According to the definition of State Grid Corporation of China's intelligent meter, intelligent electric energy meter is made up of measuring unit, data processing unit, communication unit etc., has electrical energy metering, information stores and the electric energy meter of the function such as process, Real-Time Monitoring, automatically control, information interaction.Therefore, existing intelligent electric energy meter does not possess electricity consumption malfunction monitoring and defencive function.
Intelligent low-pressure device for switching art equipment had achieved very much progress in recent years; occur as Intelligent switchs such as intelligent low-pressure comprehensive protection device, intelligent electricity leakage protector, intelligent breakers; its major function is low-voltage circuit control and protection; the protect types related generally to has overvoltage, under-voltage, decompression, overcurrent, short circuit, electric leakage (residual current) etc.; and some intelligent switch electrical equipment also have communication function, can realize the remote monitoring of device for switching ruuning situation.But these intelligent switch electrical equipment also also exist some shortcomings, as: be difficult to realize realizing interaction with higher level's electrical network smart machine and system; Need to set up independently communication and supervisory system, construction maintenance cost is high.Therefore, in power consumer, larger difficulty will also be there is by large scale application intelligent switch electrical equipment.
In addition, the raising required along with power supply reliability, because power autonomous and dual power supply user constantly increases in recent years, cause being on the increase from the anti-power transmission event of user's side direction low voltage electric network, the personal safety of low voltage electric network maintenance personal in serious threat.According to the data of retrieval, domestic at present also do not have can for the protectiveness Intellectualized Switchgear prevented specially at low voltage electric network from the anti-power transmission in user side.
State Grid Corporation of China proposes at " 12 " period Accelerating The Construction strong intelligent grid, and the main feature of strong intelligent grid is " informationization, robotization, interactive ".At low-voltage distribution, the gordian technique related to is needed to mainly contain intelligent power two-way interaction technology, Self-Service technology, customer trouble intellectualized manage technique, safety on line multiplexe electric technology etc. by all kinds of means with electrical domain.
Low voltage electric network is the weakest link of technology and equipment that intelligent grid is built, and the technology and equipment in current existing low voltage electric network field is all difficult to the demand meeting intelligent grid.Be embodied in; intelligent electric energy meter is still confined to electric energy metrical, charging and relevant information interaction function; intelligent low-pressure device for switching is still confined to electrically monitoring and electric protection aspect function, does not also have a kind of intelligent terminal simultaneously with intelligent electric energy meter and intelligent switch electrical equipment two aspect function.
Intelligent electric energy meter is mounted in a kind of intelligent terminal between low voltage electric network and electricity consumer lines equipment property right circle point, is " intelligent grid " Medial & Low Voltage Power Network part " nerve ending ".Take intelligent electric energy meter as carrier, expand intelligent electric energy meter by the function in electrical measurement, protecting control, malfunction monitoring analysis, power information interaction, to power supply enterprise and power consumer, all there is very strong practical value.Therefore; invent a kind of intelligent electric energy meter with electricity consumption malfunction monitoring defencive function; as the intelligent terminal equipment integrating the function such as metering and billing, switch, measurement, protecting control, on-line monitoring, communication, an electricity consumption interaction, will greatly promote the development of intelligent grid construction in low-voltage distribution, electricity consumption.
Summary of the invention
The technical problem to be solved in the present invention is: overcome the deficiencies in the prior art, a kind of intelligent electric energy meter with electricity consumption malfunction monitoring and defencive function is provided, by electricity consumption working condition measuring, fault analysis, fault isolation is protected, fault remote is monitored, the functions such as power information is interactive include intelligent electric energy meter envelop of function in, intelligent electric energy meter is made to have the protection of electricity consumption malfunction monitoring and warning function, can automatic analysis isolated fault point as required, with shared a set of network channel and the equipment of power information acquisition system, compatible power information acquisition system communication protocol, power information acquisition system main website can be that terminal management carrier realizes managing the remote failure monitoring of power consumer with intelligent electric energy meter.By improving, the anti-stealing electricity function of intelligent electric energy meter can also be improved and prevent the generation of the dangerous electricity consumption behavior of part.
The monitoring of intelligent electric energy meter of the present invention and protection to as if electric energy meter on the downside of electric wiring and equipment, monitoring and protect types comprise: the type fault such as overvoltage, under-voltage, decompression, overcurrent, short circuit, electric leakage (residual current), anti-power transmission is protected.
The technical solution adopted in the present invention is: a kind of intelligent electric energy meter comprises computation chip, leakage current sample circuit, phase current sampling circuit, phase voltage sample circuit, central processor CPU and low-voltage circuit breaker, described leakage current sample circuit electrically connects described computation chip, described computation chip and central processor CPU electrically connect mutually, described central processor CPU electrically connects described low-voltage circuit breaker through a tripping operation output interface, described low-voltage circuit breaker electrically connects described central processor CPU through a state acquisition interface, also comprises power module.It is characterized in that, described computation chip is a kind of digital signal processing (DigitalSingnalProcessing being specifically designed to electric energy metrical and the process of the electric signal such as voltage, electric current, be called for short DSP) chip, be responsible for phase current, phase voltage digital signal to be converted to power and electricity by calculation process, be also responsible for phase voltage, phase current, leakage current digital signal to be converted to effective value by calculation process; Described central processor CPU adopts embedded microprocessor; responsible Protection parameters is adjusted, protect the emergency protection Intelligent treatment judging and send instruction; the monitoring of described intelligent electric energy meter and protection to as if electric energy meter on the downside of electric wiring and equipment, malfunction monitoring and protect types comprise: the type fault protection such as overvoltage, under-voltage, decompression, overcurrent, short circuit, electric leakage (residual current), anti-power transmission.
Preferably, described central processor CPU adopts the embedded microprocessor supporting real-time multi-task operating system.
Preferably, also comprise communication interface, communication module, long-range main website, described communication interface is electrically connected to each other with described central processor CPU, communication module respectively, adopts data communication protocol mutually to carry out communication between described long-range main website and communication module.
Preferably, also comprise communication interface, communication module, concentrator, long-range main website, described communication interface is electrically connected to each other with described central processor CPU, communication module respectively, described long-range main website and concentrator, adopts data communication protocol mutually to carry out communication between described concentrator and communication module respectively.
Preferably, described low-voltage circuit breaker comprises shunt release and auxiliary contact, and described tripping operation output interface electrically connects shunt release, and described auxiliary contact electrically connects state acquisition interface.
Preferably, also comprise protection control switch and tripping relay, described protection control switch and tripping relay are serially connected on the output control loop of output interface.
Further, also comprise keyboard, display screen, audible-visual annunciator, described keyboard electrically connects described central processor CPU, and described central processor CPU electrically connects described display screen, audible-visual annunciator respectively.
Further, described display screen is for showing the protection dependent event information of electricity, the electricity charge, power, table meter fault and overcurrent, short circuit, overvoltage, under-voltage, decompression, electric leakage, anti-power transmission fault
Further, described audible-visual annunciator is for pointing out electric energy meter operating condition, communications status, electric energy meter abnormality, relevant emergency protection information.
Further, described data communication protocol carries out function expansion in the communication protocol and technical manual of " power user power consumption information acquisition system ", acquisition system that the protocol realization after expansion is backward compatible and equipment, common user communication passage.
Further, described intelligent electric energy meter and long-range main station system or remote administration terminal carry out two-way communication by data communication protocol, and accept the management of long-range main station system or remote administration terminal.
Further, described central processor CPU electrically connects mutually with a clock module respectively, mutually electrically connects with a data-carrier store.
A kind of electricity consumption malfunction monitoring and the control method with the intelligent electric energy meter of electricity consumption malfunction monitoring defencive function are also provided, comprise the following steps:
Step 1: one or more composite signals in the ac voltage signal that the ac current signal that the described phase current sampling circuit in intelligent electric energy meter gathers, described phase voltage sample circuit gather and the leakage current signal that described leakage current sample circuit gathers are converted to digital signal, import described computation chip into and carry out data processing, and stored in working storage;
Step 2: be previously stored with by the various protection seting value of long-range main website or intelligent electric energy meter key-press input or warning setting valve in described data-carrier store, described central processor CPU constantly reads or receives the data from computation chip, and compare with corresponding protection seting value or warning setting valve, judge intelligent electric energy meter connect duty residing for user load lateral circuit;
Step 3: when the data value read or receive is in the setting range of normal operating conditions, then do not start corresponding failure protection and warning subroutine, data analysis is added up by described central processor CPU, form the statistics such as mean value, maximal value, minimum value in the unit interval, and show on a display screen, and related data is uploaded, is forwarded to long-range main website through concentrator by timing, or directly upload to long-range main website, so that long-range main website carries out data storage and analysis, then returns step 2; When exceeding or lower than setting range, then start the protection subroutine of corresponding failure, carry out further breakdown judge; According to comprehensive descision result, central processor CPU sends trip protection instruction to described low-voltage circuit breaker, the shunt release action open-circuit line in described low-voltage circuit breaker, or sends alarm command to audible-visual annunciator, reports to the police;
Step 4: by described central processor CPU by reporting to the police, the implementation status of fault protection trip event and emergency protection or warning forms event of failure message with timestamp; write data-carrier store; and show over the display; dependent failure event message and data are uploaded by described intelligent electric energy meter in real time; long-range main website is forwarded to through concentrator; or directly uploading to long-range main website, long-range main website carries out data storage and analysis.
Preferably, the overvoltage prestored in gathered current ac voltage signal data and described data-carrier store, under-voltage, decompression setting valve compare by described central processor CPU, when phase voltage value > overvoltage setting valve, then meet overvoltage fault verification entry condition; When the under-voltage setting valve of phase voltage value < and current voltage value > decompression setting valve time, then meet under-voltage fault verification entry condition; When phase voltage value < decompression setting valve, then meet no-voltage fault and judge entry condition; When magnitude of voltage numerical value meets above-mentioned scope, intelligent electric energy meter trigger voltage class protection subroutine, carries out further breakdown judge, carries out comprehensive descision according to data such as voltage swing, fluctuation situation, out-of-limit duration, low-voltage circuit breaker divide-shut brake location statuss.
Preferably, the overcurrent prestored in gathered current ac current signal data and described data-carrier store, short circuit setting valve compare by described central processor CPU, when phase current values > over-current adjusting value, then meet over current fault and judge entry condition; When phase current values > short circuit setting valve, then meet short trouble and judge entry condition; When current value numerical value meets above-mentioned scope, intelligent electric energy meter starting current class protection subroutine, carries out further breakdown judge, carries out comprehensive descision according to data such as phase current size, fluctuation situation, out-of-limit duration, low-voltage circuit breaker divide-shut brake location statuss.
Preferably, described central processor CPU is by the gathered current active power with direction symbol or current data and null value, anti-power transmission protection power setting valve compares, as active power value <0 and active power absolute value > anti-power transmission protection power setting valve time, or as phase current values <0 and phase current absolute value > anti-power transmission protective current setting valve time, intelligent electric energy meter starts anti-power transmission class emergency protection subroutine, carry out further breakdown judge, according to reverse active power or size of current, fluctuation situation, the reverse out-of-limit duration, the data such as low-voltage circuit breaker divide-shut brake location status carry out comprehensive descision.
Compared with prior art, the invention has the beneficial effects as follows: 1, provide power module, for low-voltage circuit breaker provides reliable and stable protection act to control power supply, improve reliable rate and the protection act accuracy of whole device, and reduce the failure rate of low-voltage circuit breaker trip operation mechanism, for intelligent electric energy meter nucleus module provides operation back-up source, support the operational modes such as standby, the dormancy of intelligent electric energy meter nucleus module, providing condition for resuming operation fast after intelligent electric energy meter power down, improve the practicality of failure protection function, 2, polytype electricity consumption fault alarm and protection are provided, electricity consumption emergency protection type comprises overvoltage, under-voltage, decompression, overcurrent, short circuit, electric leakage (residual current), the type protections such as anti-power transmission, by electricity consumption fault alarm and the defencive function of intelligent electric energy meter, can realize power consumer voltage, electric current, the fault alarm of the types such as power and emergency protection, prevention electric fault and automatic separating fault point, the drain conditions of Real-Time Monitoring electric wiring and equipment, reduce the electric energy loss and economic loss that cause because leaking electricity, the economic loss prevented and reduce because electric wiring equipment failure causes and the generation of personal safety accident, and effectively improve the reliability of low voltage electric network, 3, polytype electricity consumption failure message is provided to point out, intelligent electric energy meter can show relevant failure message and electricity consumption information on its display screen, maintain easily the reason of personnel and user understanding electric fault intuitively, accurately and timely fix a breakdown and hidden danger, and accurately can distinguish power-off fault reason and caused by power consumer or caused by power supply enterprise, for power supply enterprise and electric power electricity consumption fault analysis provide foundation, improve power supply reliability and breakdown repair efficiency.The back-up source that intelligent electric energy meter is built-in with power module and is powered by rechargeable battery, can continue in a period of time to point out failure condition after intelligent electric energy meter power-off, manually can wake up when intelligent electric energy meter proceeds to standby mode and carry out data query; 4, electricity consumption fault management can include telemanagement in, and especially accessible power user power consumption information acquisition system manages.Power supply enterprise includes electricity consumption fault management in range of management, low voltage electric network and user power utilization fault pests occurrence rule can be analyzed, timely early warning and take measures investigation fault and hidden danger, improve the intelligent level of low voltage electric network and electricity consumption, effectively instructs power consumer science, safety, efficient electricity consumption; 5, compatible existing power user power consumption information acquisition system and equipment.The present invention carries out function expansion in the communication protocol and technical manual of " power user power consumption information acquisition system ", its great advantage be exactly can backward compatible acquisition system and equipment, can common user communication passage; 6, by adding the current acquisition element having and gather neutral line current or gather phase line, neutral line current simultaneously, more effectively can monitor the electricity filching behavior adopting current return shunting or short circuit method, improve the function of opposing electricity-stealing of intelligent electric energy meter, and prevent the generation of dangerous electricity consumption behavior, reduce the economic loss that power supply enterprise causes because measuring exception and stealing.
Accompanying drawing explanation
Fig. 1 is the circuit structure block diagram of the mode one that the present invention divides according to the object of nucleus module exchanges data;
Fig. 2 is the circuit structure block diagram of the mode two that the present invention divides according to the object of nucleus module exchanges data;
Fig. 3 is electricity consumption emergency protection primary control program schematic diagram;
Fig. 4 is the circuit structure diagram of the present invention according to the mode one of alternating-current electric signals collecting sensor element Type division;
Fig. 5 is the circuit structure diagram of the present invention according to the mode two of alternating-current electric signals collecting sensor element Type division;
Fig. 6 is the circuit structure diagram of the present invention according to the mode three of alternating-current electric signals collecting sensor element Type division;
Fig. 7 is the built-in schematic diagram of low-voltage circuit breaker of the present invention;
Fig. 8 is low-voltage circuit breaker external schematic diagram of the present invention;
Description of reference numerals: 1, computation chip; 2, leakage current sample circuit; 3, phase current sampling circuit; 4, phase voltage sample circuit; 5, trip output interface; 6, state acquisition interface; 7, low-voltage circuit breaker; 8, communication interface; 9, communication module; 10, data-carrier store; 11, clock module; 12, central processor CPU; 13, audible-visual annunciator; 14, display screen; 15, keyboard; 16, long-range main website; 17, concentrator; 18, power module.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
As shown in Figure 1 and Figure 2; a kind of intelligent electric energy meter with electricity consumption malfunction monitoring and defencive function; comprise computation chip 1, phase current sampling circuit 3, phase voltage sample circuit 4, central processor CPU 12, leakage current sample circuit 2, low-voltage circuit breaker 7, and power module 18.Described leakage current sample circuit 2 electrically connects described computation chip 1, described computation chip 1 electrically connects mutually with central processor CPU 12, described central processor CPU 12 electrically connects described low-voltage circuit breaker 7 through a tripping operation output interface 5, and described low-voltage circuit breaker 7 electrically connects described central processor CPU 12 through a state acquisition interface 6.Described leakage current sample circuit 2 comprises leakage current pick-up transducers.
Also comprise communication interface 8, communication module 9, keyboard 15, display screen 14, audible-visual annunciator 13, described communication interface 8 is electrically connected to each other with described central processor CPU 12, communication module 9 respectively, described keyboard 15 accesses described central processor CPU 12, and described central processor CPU 12 electrically connects described display screen 14, audible-visual annunciator 13 respectively.Described central processor CPU 12 and a clock module 11 electrically connect mutually.Described central processor CPU 12 and a data-carrier store 10 electrically connect mutually.
Leakage current sample circuit is responsible for low-voltage leakage electric current AC analogue signal to be converted to digital signal, and imports leakage current digital signal into computation chip and carry out data processing.In leakage current sample circuit, most important element is leakage current pick-up transducers, leakage current pick-up transducers is the AC analogue signal conversion element of leakage current, by line electrical leakage current signal by a certain percentage relation be converted to the AC signal being suitable for the process of leakage current sample circuit, leakage current sample circuit outputs to computation chip after again electric leakage AC analogue signal being converted to digital signal, carries out leakage current digital signal processing by computation chip.Leakage current pick-up transducers can adopt the leakage current signal such as current transformer or shunt resistance to gather sensing element.The phase current of three-phase or single phase low voltage circuit, phase voltage AC analogue signal are converted to the digital signal that proper measurement chip gathers by phase current sampling circuit, phase voltage sample circuit respectively, and voltage, current digital signal are imported into computation chip and carry out data processing, form the measurement data such as electric current, voltage, electric power, electricity.Voltage, current sampling circuit comprise sensor element, are generally voltage, current transformer or dividing potential drop, shunt resistance element.Computation chip is a kind of digital signal processing (DigitalSingnalProcessing being specifically designed to electric energy metrical and the process of the electric signal such as voltage, electric current, be called for short DSP) chip, in the present invention, computation chip is not only responsible for phase current, phase voltage digital signal to be converted to power and electricity by calculation process, also phase voltage, phase current, leakage current digital signal is responsible for be converted to effective value by calculation process, and related data to be stored in the working storage of computation chip.CPU is the core parts of intelligent electric energy meter; general employing embedded microprocessor; be the protection Intelligent treatment core parts that intelligent electric energy meter realizes that instruction is adjusted, protects judgement and sent to Protection parameters, and be responsible for the tasks such as data parameters storage administration, peripheral hardware control and Control on Communication.Data-carrier store except for except the data such as storage of electrical energy metering, charging and table meter event, also for stored electricity data (phase voltage, phase current, leakage current etc.), parameter and event information.Tripping operation output interface is used for exporting tripping operation control wave or level signal to low-voltage circuit breaker, realizes controlling the tripping operation of low-voltage circuit breaker.Tripping operation output interface comprises a tripping relay, for controlling the output of trip signal.Whether tripping operation output interface also comprises protection control switch, on the output control loop of protection control switch serial connection tripping operation output interface, come into operation for the fault protection trip function setting intelligent electric energy meter.State acquisition interface is responsible for the divide-shut brake location status amount gathering low-voltage circuit breaker.Communication interface and communication module are responsible for communicating of intelligent electric energy meter and the intelligent terminals such as concentrator, long-range main website, field portable data acquisition PDA.Clock is timing device, and from charged pool, for the independent timing of intelligent electric energy meter, and guarantees that intelligent electric energy meter still can accurately timing when power-off, to guarantee the accuracy of failure message time of origin record.Keyboard button, display, acousto-optic are designated as the input-output apparatus of the man-machine interaction of intelligent electric energy meter, and responsible electricity consumption malfunction monitoring defencive function debugging and fault alarm, failure message show.Power module is the circuit module with voltage stabilizing, rectification and charge function, and the normal operation being responsible for intelligent electric energy meter itself provides stable power supply, and can be low-voltage circuit breaker and control to provide safe and reliable low-voltage to control power supply.Power module comprises one group of rechargeable battery power supply in support, can support that intelligent electric energy meter maintains after dead electricity and run a period of time, carry out data processing, data storage, data communication, display information and send the operations such as alerting signal; And according to battery power Expenditure Levels, automatically proceed to standby, dormant state, to resume operation fast during intelligent electric energy meter telegram in reply.Low-voltage circuit breaker is a kind of low-voltage circuit breaker with shunt release and auxiliary contact.The effect of shunt release is a kind of contents realizing carrying out low-voltage circuit breaker sub-switching operation as intelligent electric energy meter, when intelligent electric energy meter tripping operation control interface exports sub-gate signal, just connects shunt opening trip coil power supply, handles low-voltage circuit breaker separating brake.Auxiliary contact is a kind of contents of low-voltage circuit breaker for auxiliary judgment divide-shut brake position, and the moving contact of it and low-voltage circuit breaker links, and is responsible for the divide-shut brake position state signal to intelligent electric energy meter feedback low-voltage circuit breaker.Low-voltage circuit breaker is the electrical control equipment for cutting off and recover user load, and the shunt opening trip coil of low-voltage circuit breaker, auxiliary contact are connected with the tripping operation output interface of intelligent electric energy meter, state acquisition interface respectively.In the present invention, low-voltage circuit breaker to be responsible for when breaking down open failure point or fault power consumer as required, and can disconnect low-voltage circuit breaker according to the instruction of long-range main website or prevent low-voltage circuit breaker from illegally being closed a floodgate according to the parameter that long-range main website issues.The low-voltage circuit breaker with electric switch-on operating mechanism external accessory can be selected, and increase combined floodgate output interface in intelligent electric energy meter core, expanded by function, the function of intelligent electric energy meter to low-voltage circuit breaker automatic reclosing can be realized, and realize long-range main website to low-voltage circuit breaker remote control closing function belonging to intelligent electric energy meter.Concentrator refers to the data of collecting each acquisition terminal or electric energy meter; row relax of going forward side by side stores; simultaneously can and power information collection main website or handheld device carry out the equipment of exchanges data; in the present invention, concentrator is also responsible for intelligent electric energy meter failure protection function related data, parameter, the storage of event and forwarding.Long-range main website refers to power information acquisition system main website, is responsible for carrying out data acquisition and management to intelligent electric energy meter, and service data, controling parameters and the protecting control be also responsible for intelligent electric energy meter carries out telemanagement.
The present invention also provides a kind of electricity consumption malfunction monitoring and the control method with the intelligent electric energy meter of electricity consumption malfunction monitoring defencive function, comprises the following steps:
(1) one or more composite signals in the ac voltage signal that the ac current signal that the described phase current sampling circuit in intelligent electric energy meter gathers, described phase voltage sample circuit gather and the leakage current signal that described leakage current sample circuit gathers are converted to digital signal, import described computation chip into and carry out data processing, and stored in working storage;
(2) be previously stored with in described data-carrier store by the various protection seting value of long-range main website or intelligent electric energy meter key-press input or warning setting valve, described central processor CPU constantly reads or receives the data from computation chip, and compare with corresponding protection seting value or warning setting valve, judge intelligent electric energy meter connect duty residing for user load lateral circuit;
(3) when the data value read or receive is in the setting range of normal operating conditions, then do not start corresponding failure protection and warning subroutine, data analysis is added up by described central processor CPU, form the statistics such as mean value, maximal value, minimum value in the unit interval, and on a display screen, and related data is uploaded, is forwarded to long-range main website through concentrator by timing, or directly upload to long-range main website, store so that long-range main website carries out electric leakage data and analyze, then return step (2); When exceeding or lower than setting range, then start the protection subroutine of corresponding failure, carry out further breakdown judge; According to comprehensive descision result, central processor CPU sends trip protection instruction to described low-voltage circuit breaker, the shunt release action open-circuit line in described low-voltage circuit breaker, or sends alarm command to audible-visual annunciator, reports to the police;
(4) by described central processor CPU by reporting to the police, the implementation status of fault protection trip event and emergency protection or warning forms event of failure message with timestamp; write data-carrier store; and show over the display; dependent failure event message and data are uploaded by described intelligent electric energy meter in real time; long-range main website is forwarded to through concentrator; or directly uploading to long-range main website, long-range main website carries out data storage and analysis.
Its emergency protection principle of work and process as follows:
The monitoring of intelligent electric energy meter and protection to as if electric energy meter on the downside of electric wiring and equipment, monitoring and protection content comprise: the type fault protection such as overvoltage, under-voltage, decompression, overcurrent, short circuit, electric leakage (residual current), anti-power transmission.
For realizing all kinds of electricity consumption emergency protection, in the embedded type CPU core working procedure of intelligent electric energy meter, each emergency protection subroutine is all benefited from electric fault protection primary control program and is controlled.For guaranteeing the real-time that malfunction monitoring is protected, embedded type CPU and operating system thereof should select the operating system supporting real-time multi-task.
Electricity consumption emergency protection primary control program as shown in Figure 3, after intelligent electric energy meter powers up startup, loads electricity consumption emergency protection primary control program immediately and carries out electricity consumption failure monitoring and protection.Electricity consumption emergency protection primary control program reads from computation chip one group of current phase voltage, phase current, leakage current numerical value, and phase voltage, phase current, leakage current numerical value is compared with corresponding setting valve respectively.If phase voltage, phase current, leakage current numerical value are out-of-limit; or there is anti-power transmission abnormal signal; then check whether the protection subroutine process of corresponding failure is in operation; if corresponding protection subroutine is run; then directly turn back to the next item down data decision node; if corresponding protection subroutine off-duty, then start corresponding protection subroutine process and judge further, and turn back to the next item down data decision node.After each data item has compared with setting valve all, flow process turns back to and reads new one group of current phase voltage, phase current, leakage current numerical value node, and carries out cycle criterion by above-mentioned flow process.Because intelligent electric energy meter adopts real-time multi-task operating system; therefore intelligent electric energy meter supports multinomial fault type parallel detection simultaneously protection; operating system creates corresponding failure process according to different fault signal type temporarily; start corresponding protection subroutine; when after completing fault protection or fault-signal disappear after, operating system automatically stops and discharges this process.
Intelligent electric energy meter adopts supports that the advantage of the operating system of real-time multi-task is: just can realize multiple electric fault protect types such as voltage, electric current, electric leakage, anti-power transmission by a cpu chip and run simultaneously; can guarantee that emergency protection judges and protection act real-time, and the unified coordinated scheduling of dissimilar protection subprogram activation can be realized.
Now for earth leakage protection, its emergency protection principle of work and process is described:
When intelligent electric energy meter connect user load lateral circuit occur touch, electric leakage time, the zero sequence current mutual inductor of intelligent electric energy meter inside just generates leakage current, leakage current signal is input to A/D converter and carries out the collection of leakage current analog signal figure by the secondary circuit of zero sequence current mutual inductor after treatment, leakage current simulating signal is converted to digital signal, and will and import leakage current digital signal into computation chip and carry out data processing.The leakage current data that leakage current sample circuit transmits by computation chip form the data such as leakage current effective value, average data after mathematical operation process, and store data in the working storage of computation chip.CPU constantly reads or receives the leakage current data from computation chip, and real-time leakage current data and earth leakage protection setting valve or warning setting valve are compared, if leakage current value is greater than earth leakage protection setting valve or warning setting valve, then start earth leakage protection subroutine, when meeting earth leakage protection tripping operation trigger condition, CPU exports tripping operation control wave or level signal by tripping operation output interface to low-voltage circuit breaker, connect the shunt opening trip coil power supply of low-voltage circuit breaker, realize earth leakage protection tripping operation; When meeting leakage-current alarm trigger condition, CPU exports control signal to sound and light alarm equipment, connects sound and light alarm equipment and carries out leakage-current alarm.Described earth leakage protection setting valve or warning setting valve are by the earth leakage protection of long-range main website or intelligent electric energy meter key-press input and alarm parameters; parameter type comprises earth leakage protection setting valve, leakage-current alarm setting valve, earth leakage protection tripping operation delay time, parameter such as earth leakage protection tripping operation Enable/Disable, leakage-current alarm Enable/Disable etc., and correlation parameter is all stored in the data-carrier store of intelligent electric energy meter.
Earth leakage protection subroutine is that intelligent electric energy meter carries out electric leakage judgement and sends one section of computer program code of trip protection/alarm command; its principle is that the various factors such as size, fluctuation situation, duration according to leakage current carries out from motion tracking and intelligent decision, whether sends earth leakage protection tripping operation or leakage-current alarm instruction according to judged result and predetermined strategy decision.
Leakage-current alarm, earth leakage protection trip event that the power consumer that intelligent electric energy meter is monitored occurs because of electric leakage; and the implementation status condition of earth leakage protection or leakage-current alarm; the event message with timestamp is formed by CPU; event message is write data-carrier store, and dependent event information is shown on a liquid crystal display.After leakage-current alarm, earth leakage protection trip event occur, dependent event message and data are also uploaded by intelligent electric energy meter in real time, be forwarded to long-range main website through concentrator, or directly upload to long-range main website.
If intelligent electric energy meter connects load-side leakage current value in normal range, the CPU of intelligent electric energy meter is also continuous to be read current leakage current value from data-carrier store and carries out analytic statistics, form the statistics such as leakage current mean value, maximal value, minimum value in the unit interval, and as required in liquid crystal display screen display related data, and related data is uploaded, is forwarded to long-range main website through concentrator by timing, or directly upload to long-range main website, store so that long-range main website carries out electric leakage data and analyze.
Other type protection principle of work such as the overvoltage of intelligent electric energy meter, under-voltage, decompression, overcurrent, short circuit, anti-power transmission is consistent with earth leakage protective principle process with process; its difference is service data, controling parameters, event information type difference, different from warning subroutine with the protection of performed correspondence.
Overvoltage, under-voltage, no-voltage fault protection principle of work and process are as follows:
The voltage signal that intelligent electric energy meter is gathered by phase voltage sample circuit, the voltage data after computation chip computing, not only as the data source of electricity, power calculation, also as the voltage class malfunction monitorings such as overvoltage, under-voltage, decompression and protection judgment basis.Similar with Leakage Protective Rule, gathered current voltage data and the overvoltage be stored in advance in data-carrier store, under-voltage, decompression setting valve compare by the CPU of intelligent electric energy meter, when current voltage value > overvoltage setting valve, then meet overvoltage fault verification entry condition; When the under-voltage setting valve of current phase voltage value < and current voltage value > decompression setting valve time, then meet under-voltage fault verification entry condition; When current phase voltage value < decompression setting valve, then meet no-voltage fault and judge entry condition.If current voltage value numerical value meets above-mentioned scope, then show there is voltage class fault, intelligent electric energy meter trigger voltage protection subroutine carries out further breakdown judge, comprehensive descision is carried out according to data such as voltage swing, fluctuation situation, out-of-limit duration, low-voltage circuit breaker divide-shut brake location statuss, when meeting fault alarm condition, then output alarm information; When meeting fault protection condition, then export trip command to tripping operation control interface, control low-voltage circuit breaker disconnect user circuit.Voltage class failure message also shows after judging on the display of intelligent electric energy meter, and real-time report is to long-range main website.
Overcurrent, short trouble protection principle of work and process as follows:
The current data that intelligent electric energy meter is gathered by phase current sampling circuit, the current data after computation chip computing, not only as the data source of electricity, power calculation, also as the current capacity such as overcurrent, short circuit malfunction monitoring and protection judgment basis.Similar with Leakage Protective Rule, gathered current flow data and the overcurrent be stored in advance in data-carrier store, short circuit setting valve compare by the CPU of intelligent electric energy meter, when current phase current values > over-current adjusting value, then meet over current fault and judge entry condition; When current phase current values > short circuit setting valve, then meet short trouble and judge entry condition.If present current value numerical value meets above-mentioned scope, then show there is current capacity fault, intelligent electric energy meter starting current protection subroutine carries out further breakdown judge, comprehensive descision is carried out according to data such as phase current size, fluctuation situation, out-of-limit duration, low-voltage circuit breaker divide-shut brake location statuss, when meeting fault alarm condition, then output alarm information; When meeting fault protection condition, then export trip command to tripping operation control interface, control low-voltage circuit breaker disconnect user circuit.Current capacity failure message also shows after judging on the display of intelligent electric energy meter, and real-time report is to long-range main website.
Anti-power transmission emergency protection principle of work and process as follows:
Anti-power transmission refers to the phenomenon of power supply through the reverse power transmission of improper approach, and in low voltage electric network, the principal mode of anti-power transmission is low-voltage electricity user side emergency generator's power supply or the double-cricuit supply phenomenon to the reverse power transmission of low voltage electric network.Its harm is when low-voltage distribution network interruption maintenance, and the anti-power transmission of electric power electricity consumption very easily causes line facility maintainer to suffer electric shock to cause human casualty accident.
The anti-power transmission emergency protection principle of intelligent electric energy meter of the present invention is: when intelligent electric energy meter detects the phase line active power that flows through intelligent electric energy meter or electric current is reverse; disconnect low-voltage circuit breaker immediately, disconnection electric power electric line or equipment connect with the electric of low voltage electric network.According to electric energy four-quadrant diagram, when applied power drops on the Ith or the IVth quadrant, electric energy throughput direction is for be powered to power consumer by low voltage electric network, and its active power and direction of current are forward, belongs to normal power transmission state; When applied power drops on the IIth or III quadrant, electric energy throughput direction is for be powered by power consumer side direction low voltage electric network side, and its active power and direction of current are oppositely, belongs to anti-power transmission state.
The anti-power transmission emergency protection course of work and other failure protection process similar, the gathered current active power with direction symbol or current data and null value compare by the CPU of intelligent electric energy meter, as current active power value <0 and current active power absolute value > anti-power transmission protection power setting valve time, or as current phase current values <0 and current phase current absolute value > anti-power transmission protective current setting valve time, then may there is anti-power transmission situation, intelligent electric energy meter starts anti-power transmission emergency protection subroutine and carries out further breakdown judge, according to reverse active power or size of current, fluctuation situation, the reverse out-of-limit duration, the data such as low-voltage circuit breaker divide-shut brake location status carry out comprehensive descision, when meeting fault alarm condition, then output alarm information, when meeting fault protection condition, then export trip command to tripping operation control interface, control low-voltage circuit breaker disconnect user circuit.Anti-power transmission failure message also shows on the display of intelligent electric energy meter, and real-time report is to long-range main website.
The process of the electric data that the present invention gathers according to intelligent electric energy meter computation chip and related data, the failure protection function other type can also be expanded, as: according to three-phase voltage phasing degree order extendible go out Phase-sequence Fault protection (preventing power consumer three phase electric machine from reversing); According to the multiplying of voltage and electric current extendible go out the out-of-limit emergency protection of power (preventing power consumer electricity consumption from overloading).
Intelligent electric energy meter of the present invention; on the original power information data remote transmission function basis of reservation; improved by expansion data communication protocol and related software being carried out to malfunction monitoring protection correlation function; without the need to increasing private communication, main website hardware device; adopt shared communication medium, communication facilities and main website mode, just can realize remote monitoring and the adjustment of user power utilization emergency protection ruuning situation.
Intelligent electric meter malfunction monitoring protection correlation function data communication protocol expands, and refers to the data communication protocol gathered between main website at intelligent electric energy meter and concentrator, concentrator and power information and expands.Wherein, communication protocol between intelligent electric energy meter and concentrator expands based on DL/T645-2007 " multifunctional electric energy meter communication protocol ", and between concentrator and power information acquisition system main website, communication protocol expands based on Q/GDW376.1-2009 " power user power consumption information acquisition system communication protocol: main website and acquisition terminal communication protocol ".
The implementation method of electricity consumption fault remote monitoring is as follows:
The telecommunication protocol of intelligent electric energy meter is expanded.For leak current fault protection, increase the data item such as real-time leakage current, leakage current freezing data, leakage current curve data, increase zero sequence current mutual inductor multiplying power (as measurement point basic parameter item), leakage current thresholding (as earth leakage protection trip operation current setting), the leakage current upper limit (as leakage current off-limit alarm current setting), leakage current is got over the thresholding duration (earth leakage protection tripping operation delay time), leakage current gets over the upper limit duration (leakage-current alarm delay time), leakage current gets over thresholding coefficient of restitution, leakage current gets over measurement point threshold parameters and the Protection parameters such as upper limit coefficient of restitution, increase earth leakage protection controling parameters such as earth leakage protection tripping operation Enable/Disable, leakage-current alarm Enable/Disable etc., increase the event Item such as earth leakage protection trip event, electric leakage off-limit alarm event.Voltage class emergency protection and the current capacity such as overcurrent, the short circuit emergency protections such as overvoltage, under-voltage, decompression, and anti-power transmission emergency protection, the extending method of its communication protocol is similar to earth leakage protection type, no longer carefully states one by one.For realizing the compatibility of main website and intelligent electric energy meter function, the concentrator be connected with intelligent electric energy meter, the communication protocol of main website also carry out communication protocol expansion as stated above.
The adjustment of malfunction monitoring protection correlation parameter issues.Improved by the parameter management software function such as the electric leakage to main website, overvoltage, under-voltage, decompression, overcurrent, short circuit, anti-power transmission.For earth leakage protection, increase zero sequence current mutual inductor multiplying power, leakage current thresholding, the leakage current upper limit, leakage current more thresholding duration, leakage current more upper limit duration, leakage current more thresholding coefficient of restitution, leakage current more upper limit coefficient of restitution, earth leakage protection tripping operation Enable/Disable, the electric leakage correlation parameter management functions such as off-limit alarm Enable/Disable of leaking electricity.Complete the setting of correlation parameter in main website after, correlation parameter formed message batch or under concentrator forwards, pass to intelligent electric energy meter one by one, intelligent electric energy meter is verified the parameter message received, is resolved, and the parameter issued by main website is stored in data-carrier store.The voltage class emergency protections such as overvoltage, under-voltage, decompression, the current capacity such as overcurrent, short circuit emergency protection, and the isoparametric adjustment of anti-power transmission emergency protection issues also similar with Parameters of Earth-Leakage Protection delivery method, no longer carefully states one by one.
The remote monitoring of intelligent electric energy meter ruuning situation and emergency protection.The real time data of the types such as the leakage current collected, phase voltage, phase current, freezing data, curve data are uploaded to main website in data message mode through concentrator by intelligent electric energy meter timing automatic, the data message received carries out verifying, resolving by main website, and by data write into Databasce, carry out data exhibiting and display by main website.Intelligent electric energy meter detects with automatically starting after corresponding protection and warning subroutine process after electric fault; and form fault protection trip event or electric protection numerical value off-limit alarm event message; pertinent events information is uploaded to main website through concentrator automatically in event message mode, is processed further by main website.If main station monitoring personnel need the current or historical failure monitoring and protecting relevant information of inquiring about intelligent electric energy meter; failure message can be sent from main website and call survey order together; relevant information is passed to main website with message after receiving and calling together and survey order by intelligent electric energy meter in form automatically immediately.
Electricity consumption situation and error information displaying method as follows:
In normal electricity consumption situation, the display screen of intelligent electric energy meter automatic turning screen display can show the data such as the information that current voltage, electric current, leakage current, power, electricity, the electricity charge, time, main website issue; When generation electric fault, the display screen of intelligent electric energy meter can show the information such as electricity consumption fault type, failure cause, fault-time; When there is electric network fault and causing intelligent electric energy meter dead electricity, rely on the support of built-in back-up source, the display screen of intelligent electric energy meter still can provide the power information of a period of time to show, for repair personnel and user provide the coherent reference information of power-off event, failure judgement type and the source of failure exactly.When back-up source is depleted to a certain degree or after power-off certain hour, intelligent electric energy meter proceeds to standby low power consumpting state automatically, close all peripheral hardwares and peripheral circuit power supply, power only to the internal memory of intelligent electric energy meter core.When needing inquiry intelligent electric energy meter for information about under power down mode, intelligent electric energy meter can be waken up by manual operation keyboard button and carrying out information inquiry.When after intelligent electric energy meter telegram in reply, operating system can be experienced and reboot start-up course, normal operating condition can be returned to rapidly, guarantee the accuracy of measuring, guarantee that every failure protection function puts into operation in time.
The present invention presses the difference of the connected mode of intelligent electric energy meter nucleus module exchanges data, has two kinds of embodiments:
Mode one: as shown in Figure 1, the communication interface 8 of nucleus module is electrically connected to each other with central processor CPU 12, communication module 9 respectively, adopts data communication protocol mutually to carry out communication between long-range main website 16 and communication module 9.
Mode two: as shown in Figure 2, also comprises concentrator 17, long-range main website 16 and concentrator 17, adopts data communication protocol mutually to carry out communication between concentrator 17 and the communication module 9 of nucleus module respectively.The data of each acquisition terminal or electric energy meter collected by concentrator 17, and store, and can realize the exchanges data of electric energy meter and power information collection main website or handheld intelligent terminal device simultaneously.
The element that the present invention presses alternating-current electric signals collecting sensor in leakage current sample circuit, phase current sampling circuit, phase voltage sample circuit is selected different with the type of combination, has three kinds of embodiments:
Mode one: as shown in Figure 4, adopt transformer type acquisition elements, zero sequence current mutual inductor L1 gathers leakage current, and current transformer L2 gathers phase line current, and voltage transformer (VT) L3 gathers phase voltage.
Mode two: as shown in Figure 5, adopt transformer type acquisition elements, current transformer L1 gathers phase line current, and current transformer L2 gathers neutral line current, and voltage transformer (VT) L3 gathers phase voltage.Leakage current is superposed through computation chip mathematical operation by the instantaneous value of phase line current, neutral line current and obtains the instantaneous numerical value of leakage current.For improving the acquisition precision of leakage current, current transformer L1, L2 should adopt the current transformer that electrical specification is consistent with parameter.
Mode three: as shown in Figure 6, adopts dividing potential drop, shunt resistance type acquisition elements.Resistance R1, R2 form shunt resistance circuit jointly, wherein, R1 resistance value is less, R2 resistance value is larger, the ratio 1:N of R1 and R2 resistance value, wherein N is integer, and resistance R1 is connected in phase line, partial current signal is outputted to phase line current and gathers terminal by resistance R2 on divided circuit, and the current signal that computation chip collects is 1/(N+1) phase line current doubly.Resistance R3, R4 form shunt resistance circuit jointly for gathering neutral line current, and acquisition method is identical with phase line acquisition method.Resistance R5, R6 series connection forms voltage dividing resistance circuit for gathering phase voltage between phase line, zero line, wherein, R5 resistance value is larger, R6 resistance value is less, the ratio of R5 and R6 is M:1, wherein M is integer, and the voltage signal at R6 two ends outputs to phase voltage and gathers terminal, and the voltage signal that computation chip collects is 1/(M+1) phases line voltage doubly.Identical with mode two, leakage current is superposed through computation chip mathematical operation by the instantaneous value of phase line current, neutral line current and obtains numerical value, for improving the acquisition precision of leakage current, resistance R1, R3 should adopt the resistance that electrical specification is consistent with parameter, and resistance R2, R4 also should adopt the resistance that electrical specification is consistent with parameter.Each collection resistance described in mode three should adopt precision resistance to be used as exchanging acquisition elements.
The interchange pick-up transducers element mode of connection that what above-mentioned three kinds of modes exemplified is in single-phase situation, for three-phase four-line system, its mode of connection principle is same as described above, and difference is only to add two current acquisition elements and two voltage acquisition elements respectively.
The present invention presses the installation site of topworks's (i.e. low-voltage circuit breaker) of fault protection, has two kinds of assembly models:
Mode one: low-voltage circuit breaker is built-in.As shown in Figure 7, the low-voltage circuit breaker with electrical apparatus release and auxiliary contact is installed additional in intelligent electric energy meter inside.The quantity of state acquisition interface input terminal of the auxiliary contact access intelligent electric energy meter nucleus module of isolating switch is used for deciliter position of monitoring breaker, and the tripping operation output interface terminal of the shunt opening trip coil access intelligent electric energy meter nucleus module of isolating switch realizes fault protection trip and controls.Whether tripping operation output interface also comprises protection control switch and tripping relay, on the output control loop of protection control switch and tripping relay serial connection tripping operation output interface, come into operation in the fault protection trip function for setting intelligent electric energy meter.
Mode two: low-voltage circuit breaker external.As shown in Figure 8, low-voltage circuit breaker installation site is moved on to intelligent electric energy meter outside, the mode of connection between intelligent electric energy meter with low-voltage circuit breaker is identical with Fig. 7, electric major loop, control signal loop, state detection signal return wire one_to_one corresponding is connected.
What mode one, mode two exemplified is the mode of connection of function of the present invention in the different installation site of the protection topworks of single-phase intelligent electric energy meter; for three-phase intelligent electric-energy meter; its connection principle is constant, but three-phase low-voltage isolating switch need be selected as emergency protection topworks.For conserve space and cost, the low-voltage circuit breaker only cut-offfing phase line type can be selected, also there is identical effect, but just not have earth leakage protective effect when electric energy meter zero line and phase terminal mistake.The tripping operation output interface of such scheme all comprises a tripping relay, for being switched on or switched off the control power supply of isolating switch shunt opening trip coil, plays the effect controlling breaker open operation.The shunt opening trip coil of isolating switch controls power supply, the Type Control power supply such as alternating current 220V, direct current 24V can be adopted, both the mode of directly being powered by electric major loop (i.e. phase line) can have been adopted, the interchange that also can be exported after voltage stabilizing rectification by the power module of intelligent electric energy meter or DC power supply.Adopt and directly provide the advantage controlling Power supply mode to be that structure is simple by electric major loop, production results is low, but it is poor to control power quality, fault protection accuracy can reduce, for improving protection act accuracy, the shunt release adopting wide operating voltage range can be considered in the type selecting aspect of breaker shunt release annex; The advantage adopting the mode of being powered by the power module of intelligent electric energy meter is that fault protection accuracy is high, and can reduce the failure rate of breaker shunt release annex, improves the reliability of electricity protection.
The advantage of mode one is installed simply; if intelligent electric energy meter and superior communication mode are power carrier modes; method and the common electric energy meter of its access electrical network are completely the same, only need the phase line of low-voltage circuit line, zero line to be accessed respectively respective terminal and can realize described fault remote monitoring and protecting function.Its shortcoming is that low-voltage circuit breaker repair and replacement are inconvenient.The advantage of mode two is that low-voltage circuit breaker repair and replacement are more convenient.Shortcoming is that installation and connection is slightly aobvious complicated, and control signal wire, state detection signal line all need receive low-voltage circuit breaker respective terminal from intelligent electric energy meter terminal, need the problem considering to prevent connecting line destroyed.
Although specifically show in conjunction with preferred embodiment and describe the present invention; but those skilled in the art should be understood that; not departing from the spirit and scope of the present invention that appended claims limits; in the form and details the present invention is made a variety of changes, be protection scope of the present invention.
Claims (4)
1. one kind has electricity consumption malfunction monitoring and the control method of the intelligent electric energy meter of electricity consumption malfunction monitoring defencive function, it is characterized in that: adopt the intelligent electric energy meter with electricity consumption malfunction monitoring defencive function, the voltage signal that intelligent electric energy meter is gathered by phase voltage sample circuit, voltage data after computation chip computing, not only as the data source of electricity, power calculation, also as voltage class malfunction monitoring and the protection judgment basis of overvoltage, under-voltage, decompression; By the current data that phase current sampling circuit gathers, the current data after computation chip computing, not only as the data source of electricity, power calculation, also as current capacity malfunction monitoring and the protection judgment basis of overcurrent, short circuit; Draw voltage, current data according to gathered computing, calculate each phase line active power direction or direction of current further, as monitoring and the protection judgment basis of anti-power transmission fault, comprise the following steps:
Step 1: one or more composite signals in the ac voltage signal that the ac current signal that the phase current sampling circuit in intelligent electric energy meter gathers, phase voltage sample circuit gather and the leakage current signal that leakage current sample circuit gathers are converted to digital signal, import described computation chip into and carry out data processing, and stored in working storage;
Step 2: be previously stored with in data-carrier store by long-range main website or intelligent electric energy meter key-press input about phase voltage, the protection seting value of phase current and leakage current numerical value or warning setting valve, central processor CPU constantly reads or receives the data from computation chip, electricity consumption emergency protection primary control program reads from computation chip one group of current phase voltage, phase current, leakage current numerical value, and by phase voltage, phase current, leakage current numerical value compares with corresponding protection seting value or warning setting valve respectively, judge intelligent electric energy meter connect duty residing for user load lateral circuit,
Step 3: intelligent electric energy meter supports multinomial fault type parallel detection simultaneously protection, when the phase voltage read or receive, phase current, leakage current numerical value is all in the setting range of normal operating conditions, then do not start the protection subroutine of corresponding failure, data analysis is added up by described central processor CPU, form the mean value in the unit interval, maximal value, minimum value statistics, and show on a display screen, and timing is by data upload, long-range main website is forwarded to through concentrator, or directly upload to long-range main website, so that long-range main website carries out data storage and analysis, return step 2 again, when any one of phase voltage, phase current or leakage current numerical value exceed or lower than setting range time, or there is anti-power transmission abnormal signal, then check whether the protection subroutine process of corresponding failure is in operation, if corresponding protection subroutine is run, then directly turn back to the next item down data decision node, carry out further breakdown judge, if corresponding protection subroutine off-duty, then start corresponding protection subroutine process to judge further, and turn back to the next item down data decision node, according to comprehensive descision result, central processor CPU sends trip protection instruction to low-voltage circuit breaker, shunt release action open-circuit line in low-voltage circuit breaker, or send alarm command to audible-visual annunciator, report to the police,
Step 4: by described central processor CPU by reporting to the police, the implementation status of fault protection trip event and emergency protection or warning forms event of failure message with timestamp; write data-carrier store; and show over the display; dependent failure event message and data are uploaded by intelligent electric energy meter in real time; long-range main website is forwarded to through concentrator; or directly uploading to long-range main website, long-range main website carries out data storage and analysis.
2. a kind of electricity consumption malfunction monitoring and control method with the intelligent electric energy meter of electricity consumption malfunction monitoring defencive function according to claim 1, it is characterized in that, the overvoltage prestored in gathered current ac voltage signal data and described data-carrier store, under-voltage, decompression setting valve compare by described central processor CPU, when phase voltage value > overvoltage setting valve, then meet overvoltage fault verification entry condition; When the under-voltage setting valve of phase voltage value < and current voltage value > decompression setting valve time, then meet under-voltage fault verification entry condition; When phase voltage value < decompression setting valve, then meet no-voltage fault and judge entry condition; When magnitude of voltage numerical value meets above-mentioned scope, intelligent electric energy meter trigger voltage class protection subroutine, carries out further breakdown judge, carries out comprehensive descision according to voltage swing, fluctuation situation, out-of-limit duration, low-voltage circuit breaker divide-shut brake location status data.
3. a kind of electricity consumption malfunction monitoring and control method with the intelligent electric energy meter of electricity consumption malfunction monitoring defencive function according to claim 1, it is characterized in that, the overcurrent prestored in gathered current ac current signal data and described data-carrier store, short circuit setting valve compare by described central processor CPU, when phase current values > over-current adjusting value, then meet over current fault and judge entry condition; When phase current values > short circuit setting valve, then meet short trouble and judge entry condition; When current value numerical value meets above-mentioned scope, intelligent electric energy meter starting current class protection subroutine, carries out further breakdown judge, carries out comprehensive descision according to phase current size, fluctuation situation, out-of-limit duration, low-voltage circuit breaker divide-shut brake location status data.
4. a kind of electricity consumption malfunction monitoring and control method with the intelligent electric energy meter of electricity consumption malfunction monitoring defencive function according to claim 1, it is characterized in that, described central processor CPU is by the gathered current active power with direction symbol or current data and null value, anti-power transmission protection power setting valve compares, as active power value <0 and active power absolute value > anti-power transmission protection power setting valve time, or as phase current values <0 and phase current absolute value > anti-power transmission protective current setting valve time, intelligent electric energy meter starts anti-power transmission class emergency protection subroutine, carry out further breakdown judge, according to reverse active power or size of current, fluctuation situation, the reverse out-of-limit duration, low-voltage circuit breaker divide-shut brake location status data carry out comprehensive descision.
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