CN113778151B - Electric energy meter terminal temperature control method, device and equipment and electric energy meter - Google Patents
Electric energy meter terminal temperature control method, device and equipment and electric energy meter Download PDFInfo
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- CN113778151B CN113778151B CN202111062739.1A CN202111062739A CN113778151B CN 113778151 B CN113778151 B CN 113778151B CN 202111062739 A CN202111062739 A CN 202111062739A CN 113778151 B CN113778151 B CN 113778151B
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- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
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- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
- G05D23/2033—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature details of the sensing element
- G05D23/2034—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature details of the sensing element the sensing element being a semiconductor
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Abstract
The invention discloses a method, a device and equipment for controlling the temperature of a terminal of an electric energy meter, a computer readable storage medium and the electric energy meter, wherein voltage drop data corresponding to a connecting terminal of the electric energy meter to be measured are obtained from a PN junction temperature sensor; determining the temperature data of the corresponding wiring terminal according to the voltage drop data; judging whether the temperature data exceeds a circuit breaking threshold value; and when at least one piece of temperature data exceeds the disconnection threshold value, disconnecting the disconnection of the electric meter to be tested. The PN junction temperature sensor is arranged for the connecting terminal of the electric energy meter to be measured, the ambient temperature of the PN junction at the moment is obtained through the voltage drop of the PN junction temperature sensor, the temperature measurement of the connecting terminal is realized, and when the temperature of the connecting terminal is higher than a preset open circuit threshold value, the circuit is cut off in time, so that potential safety hazards caused by overhigh temperature are avoided; in addition, the voltage drop and the temperature change of the PN junction temperature sensor are approximately linear, so that the precision and the accuracy of temperature measurement can be greatly improved.
Description
Technical Field
The invention relates to the field of electric energy meter monitoring, in particular to a method, a device and equipment for controlling the temperature of an electric energy meter terminal, a computer readable storage medium and an electric energy meter.
Background
Along with the development of cities, the laying scale of power grids is getting stronger, and the work stability of electric meters serving as important equipment in power grid monitoring is important all the time.
The ammeter passes through binding post connecting circuit's live wire and zero line, and because ammeter binding post screw is not tight or screw, copper line department oxidation make contact impedance compare in design resistance increase, increased the transmission of electricity load of circuit, especially in summer, city domestic power surge, temperature is higher in addition, according to joule law Q ═ I 2 Rt causes the meter wiring to heat up severely. The electric meters in the old residential districts are generally installed in an electric meter box in a centralized mode, heat cannot be dissipated timely, the heat insulation materials are ignited, fire disasters occur, and life and property safety of people are seriously threatened.
Therefore, how to accurately and effectively monitor the temperature of the wiring terminal of the electric energy meter and improve the operation stability of the equipment is a problem to be solved urgently by technical personnel in the field.
Disclosure of Invention
The invention aims to provide a method, a device and equipment for controlling the temperature of a terminal of an electric energy meter, a computer readable storage medium and the electric energy meter, so as to solve the problem that the temperature of a connecting terminal of the electric energy meter cannot be effectively monitored in the prior art.
In order to solve the technical problem, the invention provides a method for controlling the temperature of a terminal of an electric energy meter, which comprises the following steps:
acquiring voltage drop data corresponding to a connecting terminal of the electric energy meter to be measured from the PN junction temperature sensor;
determining the temperature data of the corresponding wiring terminal according to the voltage drop data;
judging whether the temperature data exceeds a circuit breaking threshold value;
and when at least one piece of temperature data exceeds the circuit breaking threshold value, opening the circuit of the ammeter to be tested.
Optionally, in the method for controlling temperature of a terminal of an electric energy meter, the determining whether the temperature data exceeds a cut-off threshold includes:
judging whether the temperature data corresponding to any wiring terminal exceeds the open circuit threshold value for N times continuously;
correspondingly, the disconnecting the electric meter under test when at least one of the temperature data exceeds the disconnection threshold value comprises:
and when the temperature data corresponding to any one wiring terminal continuously exceeds the open circuit threshold value for N times, opening the open circuit of the ammeter to be tested.
Optionally, in the method for controlling temperature of a terminal of an electric energy meter, the obtaining, from a PN junction temperature sensor, voltage drop data corresponding to a terminal of the electric energy meter to be measured includes:
acquiring time period voltage drop data corresponding to a connecting terminal of the electric energy meter to be measured in unit time from the PN junction temperature sensor;
correspondingly, the determining the temperature data of the corresponding connecting terminal according to the voltage drop data comprises:
determining time period temperature data of the corresponding wiring terminal in the unit time according to the time period voltage drop data;
determining a unit time temperature value according to the time period temperature data;
judging whether the unit time temperature change value exceeds a temperature jump threshold value or not;
and when the unit time temperature change value exceeds a temperature jump threshold value, disconnecting the open circuit of the ammeter to be tested.
Optionally, in the method for controlling temperature of a terminal of an electric energy meter, after determining temperature data of a corresponding terminal according to the voltage drop data, the method further includes:
making a difference between the maximum terminal temperature and the minimum terminal temperature in the temperature data of all the wiring terminals to obtain a terminal temperature peak difference;
judging whether the terminal temperature peak difference exceeds a balance threshold value;
and when the terminal temperature peak difference exceeds a balance threshold value, breaking and switching off the ammeter to be tested.
Optionally, in the method for controlling temperature of a terminal of an electric energy meter, a method for calibrating the PN junction temperature sensor is further included:
receiving ambient temperature data;
under the condition that the electric energy meter to be tested is not connected with a circuit, test voltage drop data corresponding to a connecting terminal of the electric energy meter to be tested is obtained from a PN junction temperature sensor;
determining test temperature data of the corresponding wiring terminal according to the test voltage drop data;
determining adjustment difference value data according to the test temperature data and the environment temperature data;
and writing the adjustment difference data into an adjustment register.
An electric energy meter terminal temperature control device comprises:
the acquisition module is used for acquiring voltage drop data corresponding to a connecting terminal of the electric energy meter to be measured from the PN junction temperature sensor;
the temperature module is used for determining the temperature data of the corresponding wiring terminal according to the voltage drop data;
the judging module is used for judging whether the temperature data exceeds a circuit breaking threshold value or not;
and the switching-off module is used for switching off the circuit of the electric meter to be tested when at least one piece of temperature data exceeds the circuit-breaking threshold value.
An electric energy meter terminal temperature control device, comprising:
a memory for storing a computer program;
and the processor is used for realizing the steps of any one of the above electric energy meter terminal temperature control methods when executing the computer program.
A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, implements the steps of any of the above-mentioned methods for controlling temperature of terminals of an electric energy meter.
An electric energy meter comprises a PN junction temperature sensor and a wiring terminal;
the connecting terminal is used for connecting a live wire and a zero line of the circuit to be tested;
the PN junction temperature sensor comprises a processor and an induction unit corresponding to the connecting terminal;
the induction unit is fixedly connected with the wiring terminal through an adhesive layer;
the processor is used for receiving the voltage drop data sent by each induction unit, determining the temperature data of the corresponding wiring terminal according to the voltage drop data, judging whether the temperature data exceed a circuit breaking threshold value or not, and breaking and switching off the electric energy meter when at least one temperature data exceeds the circuit breaking threshold value.
Optionally, in the electric energy meter, the sensing unit is a triode;
the collector of the triode is grounded, the emitter of the triode is connected to the acquisition end of the processor, and the base of the triode is connected to the constant-voltage power supply.
According to the method for controlling the temperature of the terminal of the electric energy meter, voltage drop data corresponding to the connecting terminal of the electric energy meter to be measured are obtained from the PN junction temperature sensor; determining the temperature data of the corresponding wiring terminal according to the voltage drop data; judging whether the temperature data exceeds a circuit breaking threshold value; and when at least one piece of temperature data exceeds the disconnection threshold value, disconnecting the disconnection of the electric meter to be tested. The PN junction temperature sensor is arranged for the connecting terminal of the electric energy meter to be measured, the ambient temperature of the PN junction at the moment is obtained through the voltage drop of the PN junction temperature sensor, the temperature measurement of the connecting terminal is realized, and when the temperature of the connecting terminal is higher than a preset open circuit threshold value, the circuit is cut off in time, so that potential safety hazards caused by overhigh temperature are avoided; in addition, the PN junction temperature sensor has approximately linear voltage drop and temperature change in the use scene of the electric energy meter, so that the accuracy and the precision of temperature measurement can be greatly improved, and compared with other temperature sensors, the temperature sensor has the advantages of better consistency, lower power consumption, smaller volume and more flexible installation layout. The invention also provides the electric energy meter terminal temperature control device, the electric energy meter terminal temperature control equipment, the computer readable storage medium and the electric energy meter with the beneficial effects.
Drawings
In order to more clearly illustrate the embodiments or technical solutions of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
Fig. 1 is a schematic flow chart of an embodiment of a method for controlling temperature of a terminal of an electric energy meter according to the present invention;
fig. 2 is a schematic flow chart of another embodiment of a method for controlling temperature of a terminal of an electric energy meter according to the present invention;
fig. 3 is a schematic flow chart of another embodiment of a method for controlling temperature of a terminal of an electric energy meter according to the present invention;
fig. 4 is a schematic structural diagram of an embodiment of a temperature control device for a terminal of an electric energy meter according to the present invention;
FIG. 5 is a schematic structural diagram of an embodiment of an electric energy meter according to the present invention;
fig. 6 is a schematic partial structure diagram of another embodiment of the electric energy meter provided by the present invention.
Detailed Description
In order that those skilled in the art will better understand the disclosure, reference will now be made in detail to the embodiments of the disclosure as illustrated in the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The core of the invention is to provide a method for controlling temperature of a terminal of an electric energy meter, wherein the flow diagram of one specific embodiment is shown in fig. 1, which is called as the first specific embodiment and comprises the following steps:
s101: and acquiring voltage drop data corresponding to a connecting terminal of the electric energy meter to be measured from the PN junction temperature sensor.
The PN junction temperature sensor should be disposed close to the connection terminal so as to improve the representativeness of the collected data, wherein, taking a triode as an example, the voltage drop data refers to VBE, that is, the voltage between the base and the emitter. Wherein, binding post usually has four, is live wire input end, live wire output, zero line input and zero line output respectively, certainly, can acquire corresponding binding post's pressure drop data according to actual conditions.
The voltage drop data is an analog signal, and analog-to-digital conversion can be performed through an AD chip, for example, 13-bit acquisition of a CT7424 chip is adopted, and the voltage drop data can be adjusted according to actual conditions.
S102: and determining the temperature data of the corresponding wiring terminal according to the voltage drop data.
Under the working environment of the electric energy meter to be measured, the VBE of the PN junction temperature sensor is linearly related to the temperature, so that the accurate temperature of each wiring terminal can be obtained through the voltage.
S103: and judging whether the temperature data exceeds a disconnection threshold value.
The open circuit threshold value is a preset temperature value, and if the open circuit threshold value exceeds the preset temperature value, the electric energy meter to be tested may cause potential safety hazards in the working process.
S104: and when at least one piece of temperature data exceeds the disconnection threshold value, disconnecting the disconnection of the electric meter to be tested.
Namely, the electric energy meter to be tested is disconnected from the zero line and the live line connected with the electric energy meter to be tested.
As a preferred embodiment, step S103 may be modified to:
s113: judging whether the temperature data corresponding to any wiring terminal exceeds the open circuit threshold value for N times continuously;
accordingly, step S104 may be correspondingly modified to:
s114: and when the temperature data corresponding to any one wiring terminal continuously exceeds the open circuit threshold value for N times, opening the open circuit of the ammeter to be tested.
In actual work, to realize continuous monitoring of the electric energy meter to be detected, voltage drop data at the time point needs to be acquired every fixed time, so the temperature data in the actual work also needs to be temperature data continuously sampled along with time.
Still further, after determining that at least one of the temperature data exceeds the trip threshold, further comprising:
uploading the temperature data and the switching-out information to a big data platform; and further uploading the data to the big data platform through WIFI or GPRS.
And the big data platform further sends the temperature data and the switching-out information to a communication terminal of a client corresponding to the electric energy meter to be detected, explains the switching-out reason, prompts the client to reduce the power load, continuously monitors the temperature data of the electric energy meter to be detected, and restores the power supply of the user when the temperature data is reduced to be below the open circuit threshold value.
The invention also provides a calibration method of the PN junction temperature sensor, which comprises the following steps:
a1: ambient temperature data is received.
A2: under the condition that the electric energy meter to be tested is not connected with a circuit, test voltage drop data corresponding to a connecting terminal of the electric energy meter to be tested is obtained from a PN junction temperature sensor;
a3: determining test temperature data of the corresponding wiring terminal according to the test voltage drop data;
a4: determining adjustment difference value data according to the test temperature data and the environment temperature data;
a5: and writing the adjustment difference data into an adjustment register.
After the adjustment difference is written into the adjustment register, in a formal working occasion, after original temperature data directly converted from the voltage drop data is obtained, different wiring terminals are further adjusted according to the adjustment difference, and finally the temperature data is obtained.
Of course, for the sake of safety, after obtaining the adjustment difference, the calibration process may be performed again, and the test temperature data is adjusted according to the adjustment difference obtained in the previous time, and it is checked whether the adjusted test temperature data matches the environmental temperature data, which includes the following steps, taken in combination with actual situations:
the method comprises the following steps: the ambient temperature was controlled at 23 ℃.
Step two: and the upper computer sends a command to the electric energy meter to enter an in-plant mode.
Step three: the real-time temperature of the meter terminal 1 is read.
Step four: the read temperature is compared to the ambient temperature by difference.
Step five: this difference is written into the adjustment register.
Step six: and reading the meter again to measure the real-time temperature of the terminal 1, and if the real-time temperature is 23 ℃, ending the temperature correcting process.
Step seven: and storing the terminal temperature reference value into a power-down storage medium.
According to the method for controlling the temperature of the terminal of the electric energy meter, voltage drop data corresponding to the connecting terminal of the electric energy meter to be measured are obtained from the PN junction temperature sensor; determining the temperature data of the corresponding wiring terminal according to the voltage drop data; judging whether the temperature data exceeds a circuit breaking threshold value; and when at least one piece of temperature data exceeds the disconnection threshold value, disconnecting the disconnection of the electric meter to be tested. The PN junction temperature sensor is arranged for the connecting terminal of the electric energy meter to be measured, the ambient temperature of the PN junction at the moment is obtained through the voltage drop of the PN junction temperature sensor, the temperature measurement of the connecting terminal is realized, and when the temperature of the connecting terminal is higher than a preset open circuit threshold value, the circuit is cut off in time, so that potential safety hazards caused by overhigh temperature are avoided; in addition, the PN junction temperature sensor has approximately linear voltage drop and temperature change in the use scene of the electric energy meter, so that the accuracy and the precision of temperature measurement can be greatly improved, and compared with other temperature sensors, the temperature sensor has the advantages of better consistency, lower power consumption, smaller volume and more flexible installation layout.
On the basis of the first specific embodiment, further improving the condition of the electric meter to be tested for switching off to obtain a second specific embodiment, a schematic flow chart of which is shown in fig. 2, includes:
s201: and acquiring time period voltage drop data corresponding to the wiring terminal of the electric energy meter to be measured in unit time from the PN junction temperature sensor.
The pressure drop data of the time period may include all the pressure drop data in the time period, or may include only the pressure drop data of the start time and the pressure drop data of the end time in the time period, and may be adjusted according to the algorithm of the unit time temperature value below.
S202: and determining time period temperature data of the corresponding wiring terminal in the unit time according to the time period voltage drop data.
The time-period temperature data and the time-period pressure drop data can contain data, and are not described again.
S203: determining a unit time temperature value from the time period temperature data.
The unit time temperature change value can be directly the difference of the pressure drop data of the starting time and the pressure drop data of the ending time in the corresponding time period; the difference between the highest voltage drop data and the lowest voltage drop data in the corresponding time period can be used, or other algorithms are adopted according to actual conditions, so long as the temperature change of the wiring terminal in the corresponding time period can be reflected.
S204: and judging whether the unit time temperature change value exceeds a temperature jump threshold value.
S205: and when the unit time temperature change value exceeds a temperature jump threshold value, disconnecting the open circuit of the ammeter to be tested.
It should be noted that the present embodiment and the first embodiment are not related to an alternative, but may be implemented in parallel.
As can be seen from the foregoing, the scheme in the first embodiment is to collect time point data after a fixed time interval, and in the first embodiment, data in a previous period is summarized after a plurality of collection time points. If the electric energy meter to be tested works normally, the temperature of the wiring terminal does not greatly rise and fall in a short time, if the temperature change value in unit time is too large and even exceeds the temperature jump threshold value, the temperature change of the wiring terminal is over violent, the electric energy meter to be tested is judged to work abnormally, and the connection between the electric energy meter to be tested and an external circuit needs to be cut off by switching off, so that potential safety hazards are avoided, and the working reliability of equipment is further improved.
On the basis of the first specific embodiment, further improving the condition of the electric meter to be tested for switching off to obtain a third specific embodiment, a schematic flow chart of which is shown in fig. 3, includes:
s301: and acquiring voltage drop data corresponding to a connecting terminal of the electric energy meter to be measured from the PN junction temperature sensor.
S302: and determining the temperature data of the corresponding wiring terminal according to the voltage drop data.
S313: and subtracting the maximum terminal temperature and the minimum terminal temperature in the temperature data of all the wiring terminals to obtain a terminal temperature peak difference.
S314: and judging whether the terminal temperature peak difference exceeds a balance threshold value.
S315: and when the terminal temperature peak difference exceeds a balance threshold value, breaking and switching off the ammeter to be tested.
S303: and judging whether the temperature data exceeds a disconnection threshold value.
S304: and when at least one piece of temperature data exceeds the disconnection threshold value, disconnecting the disconnection of the electric meter to be tested.
It should be noted that the flow composed of S313, S314, and S315 in this embodiment has no precedence relationship with the flow composed of S303 and S304, and the positions of the two may be changed or paralleled.
In this embodiment, whether the temperature of the connection terminal is balanced or not is further determined, in other words, whether an overlarge temperature difference exists or not is further determined, in actual work, the spatial positions of the four connection terminals are not far apart, if the electric energy meter to be measured works normally, the temperature among the four connection terminals should tend to be consistent, if the temperature difference (namely, the temperature peak difference) exists and is larger than the balance threshold value, it can be determined that the electric energy meter to be measured works abnormally, and the electric energy meter to be measured should be stopped in time to avoid causing potential safety hazards.
The temperature control device for the terminals of the electric energy meter provided by the embodiment of the invention is introduced below, and the temperature control device for the terminals of the electric energy meter described below and the temperature control method for the terminals of the electric energy meter described above can be referred to correspondingly.
Fig. 4 is a block diagram of a terminal temperature control device of an electric energy meter according to an embodiment of the present invention, where in reference to fig. 4, the terminal temperature control device of the electric energy meter may include:
the acquisition module 100 is used for acquiring voltage drop data corresponding to a connecting terminal of the electric energy meter to be measured from the PN junction temperature sensor;
the temperature module 200 is used for determining the temperature data of the corresponding connecting terminal according to the voltage drop data;
a determining module 300, configured to determine whether the temperature data exceeds a shutdown threshold;
and the switching-off module 400 is used for switching off the circuit of the electric meter to be tested when at least one piece of temperature data exceeds the circuit-breaking threshold value.
As a preferred implementation, the determining module 300 includes:
the continuous judging unit is used for judging whether the temperature data corresponding to any connecting terminal exceeds the circuit breaking threshold value for N times continuously;
accordingly, the switching module 400 includes:
and the continuous determined switching-off unit is used for switching off the open circuit of the electric meter to be tested when the temperature data corresponding to any one wiring terminal continuously exceeds the open circuit threshold value for N times.
As a preferred embodiment, the obtaining module 100 includes:
the time period acquisition unit is used for acquiring time period voltage drop data corresponding to the wiring terminal of the electric energy meter to be measured in unit time from the PN junction temperature sensor;
accordingly, the temperature module 200 includes:
the time period temperature unit is used for determining time period temperature data of the corresponding wiring terminal in the unit time according to the time period voltage drop data;
the temperature change determining unit is used for determining a unit time temperature change value according to the time period temperature data;
the temperature change judging unit is used for judging whether the unit time temperature change value exceeds a temperature jump threshold value or not;
and the variable-temperature switching-off unit is used for switching off the electric meter to be tested in an open circuit mode when the variable-temperature value per unit time exceeds a temperature jump threshold value.
As a preferred embodiment, the temperature module 200 further includes:
the temperature difference unit is used for making a difference between the maximum terminal temperature and the minimum terminal temperature in the temperature data of all the wiring terminals to obtain a terminal temperature peak difference;
a balance judging unit for judging whether the terminal temperature peak difference exceeds a balance threshold value;
and the balance switching-off unit is used for switching off the electric meter to be tested when the terminal temperature peak difference exceeds a balance threshold value.
As a preferred embodiment, the method for calibrating the PN junction temperature sensor further comprises:
an environment receiving module for receiving ambient temperature data;
the test acquisition module is used for acquiring test voltage drop data corresponding to a connecting terminal of the electric energy meter to be tested from the PN junction temperature sensor under the condition that the electric energy meter to be tested is not connected with a circuit;
the test temperature module is used for determining test temperature data of the corresponding wiring terminal according to the test voltage drop data;
the adjustment determining module is used for determining adjustment difference value data according to the test temperature data and the environment temperature data;
and the register module is used for writing the adjustment difference data into an adjustment register.
The invention provides a terminal temperature control method of an electric energy meter, which is used for acquiring voltage drop data corresponding to a wiring terminal of the electric energy meter to be measured from a PN junction temperature sensor through an acquisition module 100; the temperature module 200 is used for determining the temperature data of the corresponding wiring terminal according to the voltage drop data; a determining module 300, configured to determine whether the temperature data exceeds a shutdown threshold; and the switching-off module 400 is used for switching off the circuit of the electric meter to be tested when at least one piece of temperature data exceeds the circuit-breaking threshold value. The PN junction temperature sensor is arranged for the connecting terminal of the electric energy meter to be measured, the ambient temperature of the PN junction at the moment is obtained through the voltage drop of the PN junction temperature sensor, the temperature measurement of the connecting terminal is realized, and when the temperature of the connecting terminal is higher than a preset open circuit threshold value, the circuit is cut off in time, so that potential safety hazards caused by overhigh temperature are avoided; in addition, the PN junction temperature sensor has approximately linear voltage drop and temperature change in the use scene of the electric energy meter, so that the accuracy and the precision of temperature measurement can be greatly improved, and compared with other temperature sensors, the temperature sensor has the advantages of better consistency, lower power consumption, smaller volume and more flexible installation layout.
The temperature control device for an electric energy meter terminal of this embodiment is used for implementing the aforementioned temperature control method for an electric energy meter terminal, and therefore, specific embodiments of the temperature control device for an electric energy meter terminal may be found in the foregoing embodiments of the temperature control method for an electric energy meter terminal, for example, the obtaining module 100, the temperature module 200, the determining module 300, and the switch-off module 400 are respectively used for implementing steps S101, S102, S103, and S104 in the foregoing temperature control method for an electric energy meter terminal.
The invention also provides a terminal temperature control device of the electric energy meter, which comprises:
a memory for storing a computer program;
and the processor is used for realizing the steps of any one of the above electric energy meter terminal temperature control methods when executing the computer program. According to the method for controlling the temperature of the terminal of the electric energy meter, voltage drop data corresponding to the connecting terminal of the electric energy meter to be measured are obtained from the PN junction temperature sensor; determining the temperature data of the corresponding wiring terminal according to the voltage drop data; judging whether the temperature data exceeds a circuit breaking threshold value; and when at least one piece of temperature data exceeds the disconnection threshold value, disconnecting the disconnection of the electric meter to be tested. The PN junction temperature sensor is arranged on the connecting terminal of the electric energy meter to be measured, the ambient temperature of the PN junction at the moment is obtained through the voltage drop of the PN junction temperature sensor, the temperature measurement of the connecting terminal is realized, and when the temperature of the connecting terminal is higher than a preset breaking threshold value, a circuit is cut off in time, so that potential safety hazards caused by overhigh temperature are avoided; in addition, the PN junction temperature sensor has approximately linear voltage drop and temperature change in the use scene of the electric energy meter, so that the accuracy and the precision of temperature measurement can be greatly improved, and compared with other temperature sensors, the temperature sensor has the advantages of better consistency, lower power consumption, smaller volume and more flexible installation layout.
The invention also provides a computer readable storage medium, wherein a computer program is stored on the computer readable storage medium, and when the computer program is executed by a processor, the steps of any one of the above-mentioned electric energy meter terminal temperature control methods are realized. According to the method for controlling the temperature of the terminal of the electric energy meter, voltage drop data corresponding to the connecting terminal of the electric energy meter to be measured are obtained from the PN junction temperature sensor; determining the temperature data of the corresponding wiring terminal according to the voltage drop data; judging whether the temperature data exceeds a circuit breaking threshold value; and when at least one piece of temperature data exceeds the disconnection threshold value, disconnecting the disconnection of the electric meter to be tested. The PN junction temperature sensor is arranged on the connecting terminal of the electric energy meter to be measured, the ambient temperature of the PN junction at the moment is obtained through the voltage drop of the PN junction temperature sensor, the temperature measurement of the connecting terminal is realized, and when the temperature of the connecting terminal is higher than a preset breaking threshold value, a circuit is cut off in time, so that potential safety hazards caused by overhigh temperature are avoided; in addition, the PN junction temperature sensor has approximately linear voltage drop and temperature change in the use scene of the electric energy meter, so that the accuracy and the precision of temperature measurement can be greatly improved, and compared with other temperature sensors, the temperature sensor has the advantages of better consistency, lower power consumption, smaller volume and more flexible installation layout.
The invention also provides an electric energy meter, a schematic structural diagram of a specific embodiment of which is shown in fig. 5, and the electric energy meter comprises a PN junction temperature sensor and a connecting terminal 10;
the connecting terminal 10 is used for connecting a live wire and a zero line of a circuit to be tested;
the PN junction temperature sensor comprises a processor 22 and a sensing unit 21 corresponding to the connecting terminal;
the induction unit 21 is fixedly connected with the wiring terminal 10 through an adhesive layer;
the processor 22 is configured to receive the voltage drop data sent by each sensing unit 21, determine temperature data of the corresponding connection terminal 10 according to the voltage drop data, determine whether the temperature data exceeds a disconnection threshold, and disconnect the electric energy meter when at least one of the temperature data exceeds the disconnection threshold.
As a specific embodiment, the sensing unit 21 is a transistor Q1, and a schematic diagram of a connection structure thereof can refer to fig. 6;
the collector of the transistor Q1 is grounded, the emitter of the transistor Q1 is connected to the collecting terminal of the processor 22, and the base of the transistor Q1 is connected to the constant voltage power supply.
The processor 22 adopted in fig. 6 is a CT7424 chip D1, only one connection relationship between the transistor Q1 and the processor 22 is shown in the drawing, and the other transistor Q1 is the same, and is different only in that the connection acquisition end is different, the transistor Q1 in the drawing is connected to the acquisition end DP1, and the DN end of the CT7424 chip D1 can output stable voltage, so that the base of the transistor Q1 in fig. 6 is directly connected to the DN end of the CT7424 chip D1, so as to simplify the device structure and improve the production efficiency, and certainly, in practical application, other voltage stabilizing sources can also be adopted to supply voltage to the base.
Preferably, an anti-interference capacitor C1 is arranged between the emitter and the base, so that the accuracy of the acquired voltage reduction data is increased.
The electric energy meter provided by the invention comprises a PN junction temperature sensor and a wiring terminal 10; the connecting terminal 10 is used for connecting a live wire and a zero line of a circuit to be tested; the PN junction temperature sensor comprises a processor 22 and a sensing unit 21 corresponding to the connecting terminal; the induction unit 21 is fixedly connected with the wiring terminal 10 through an adhesive layer; the processor 22 is configured to receive the voltage drop data sent by each sensing unit 21, determine temperature data of the corresponding connection terminal 10 according to the voltage drop data, determine whether the temperature data exceeds a disconnection threshold, and disconnect the electric energy meter when at least one of the temperature data exceeds the disconnection threshold. According to the invention, the PN junction temperature sensor is arranged for the connecting terminal 10 of the electric energy meter to be tested, the ambient temperature of the PN junction at the moment is obtained through the voltage drop of the PN junction temperature sensor, the temperature measurement of the connecting terminal 10 is realized, and when the temperature of the connecting terminal 10 is higher than a preset open circuit threshold value, the circuit is cut off in time, so that potential safety hazards caused by overhigh temperature are avoided; in addition, the PN junction temperature sensor has approximately linear voltage drop and temperature change in the use scene of the electric energy meter, so that the accuracy and the precision of temperature measurement can be greatly improved, and compared with other temperature sensors, the temperature sensor has the advantages of better consistency, lower power consumption, smaller volume and more flexible installation layout.
The electric energy meter provided by the invention is used for executing the electric energy meter terminal temperature control method in the foregoing, so that the specific implementation mode can be supplemented in comparison with the foregoing, and details are not repeated herein.
The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or similar parts among the embodiments are referred to each other. The device disclosed in the embodiment corresponds to the method disclosed in the embodiment, so that the description is simple, and the relevant points can be referred to the description of the method part.
It should be noted that, in the present specification, relational terms such as first and second, and the like are used only for distinguishing one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The method, the device, the equipment, the computer readable storage medium and the electric energy meter for controlling the temperature of the electric energy meter terminal provided by the invention are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (9)
1. A temperature control method for an electric energy meter terminal is characterized by comprising the following steps:
acquiring voltage drop data corresponding to a connecting terminal of the electric energy meter to be measured from the PN junction temperature sensor;
determining the temperature data of the corresponding wiring terminal according to the voltage drop data;
judging whether the temperature data exceeds a circuit breaking threshold value;
when at least one temperature data exceeds the disconnection threshold value, disconnecting the disconnection of the electric meter to be tested;
after the temperature data of the corresponding connecting terminal is determined according to the voltage drop data, the method further comprises the following steps:
the maximum terminal temperature and the minimum terminal temperature in the temperature data of all the wiring terminals are subjected to difference to obtain terminal temperature peak difference;
judging whether the terminal temperature peak difference exceeds a balance threshold value or not;
and when the terminal temperature peak difference exceeds a balance threshold value, breaking and switching off the ammeter to be tested.
2. The method for controlling the temperature of terminals of an electric energy meter according to claim 1, wherein said determining whether said temperature data exceeds a trip threshold comprises:
judging whether the temperature data corresponding to any wiring terminal exceeds the open circuit threshold value for N times continuously;
correspondingly, the disconnecting the electric meter under test when at least one of the temperature data exceeds the disconnection threshold value comprises:
and when the temperature data corresponding to any one wiring terminal continuously exceeds the open circuit threshold value for N times, opening the open circuit of the ammeter to be tested.
3. The method for controlling the temperature of the terminal of the electric energy meter according to claim 1, wherein the step of obtaining the voltage drop data corresponding to the connecting terminal of the electric energy meter to be tested from the PN junction temperature sensor comprises the following steps:
acquiring time period voltage drop data corresponding to a connecting terminal of the electric energy meter to be measured in unit time from the PN junction temperature sensor;
correspondingly, the determining the temperature data of the corresponding connecting terminal according to the voltage drop data comprises:
determining time period temperature data of the corresponding wiring terminal in the unit time according to the time period voltage drop data;
determining a unit time temperature value according to the time period temperature data;
judging whether the unit time temperature change value exceeds a temperature jump threshold value or not;
and when the unit time temperature change value exceeds a temperature jump threshold value, disconnecting the open circuit of the ammeter to be tested.
4. The method for controlling the temperature of the terminals of the electric energy meter according to claim 1, further comprising a method for calibrating the PN junction temperature sensor, wherein the method comprises the following steps:
receiving ambient temperature data;
under the condition that the electric energy meter to be tested is not connected with a circuit, test voltage drop data corresponding to a connecting terminal of the electric energy meter to be tested is obtained from a PN junction temperature sensor;
determining test temperature data of the corresponding wiring terminal according to the test voltage drop data;
determining adjustment difference data according to the test temperature data and the environment temperature data;
and writing the adjustment difference data into an adjustment register.
5. The utility model provides an electric energy meter terminal temperature regulating device which characterized in that includes:
the acquisition module is used for acquiring voltage drop data corresponding to a wiring terminal of the electric energy meter to be measured from the PN junction temperature sensor;
the temperature module is used for determining the temperature data of the corresponding wiring terminal according to the voltage drop data;
the judging module is used for judging whether the temperature data exceeds a circuit breaking threshold value;
the switching-off module is used for switching off the circuit of the electric meter to be tested when at least one piece of temperature data exceeds the circuit-breaking threshold value;
the temperature module further comprises:
the temperature difference unit is used for making a difference between the maximum terminal temperature and the minimum terminal temperature in the temperature data of all the wiring terminals to obtain a terminal temperature peak difference;
a balance judging unit for judging whether the terminal temperature peak difference exceeds a balance threshold value;
and the balance switching-out unit is used for disconnecting the circuit of the ammeter to be tested when the terminal temperature peak difference exceeds a balance threshold value.
6. An electric energy meter terminal temperature control device, comprising:
a memory for storing a computer program;
processor for implementing the steps of the method for controlling temperature of electric energy meter terminals according to any of claims 1 to 4 when executing said computer program.
7. A computer-readable storage medium, characterized in that the computer-readable storage medium has a computer program stored thereon, and the computer program is executed by a processor to implement the steps of the method for controlling temperature of an electric energy meter terminal according to any one of claims 1 to 4.
8. An electric energy meter is characterized by comprising a PN junction temperature sensor and a wiring terminal;
the connecting terminal is used for connecting a live wire and a zero line of the circuit to be tested;
the PN junction temperature sensor comprises a processor and an induction unit corresponding to the connecting terminal;
the induction unit is fixedly connected with the wiring terminal through an adhesive layer;
the processor is used for receiving the voltage drop data sent by each induction unit, determining the temperature data of the corresponding wiring terminal according to the voltage drop data, judging whether the temperature data exceeds a circuit-breaking threshold value, and switching off the open circuit of the electric energy meter when at least one temperature data exceeds the circuit-breaking threshold value;
after the temperature data of the corresponding connecting terminal is determined according to the voltage drop data, the method further comprises the following steps:
the maximum terminal temperature and the minimum terminal temperature in the temperature data of all the wiring terminals are subjected to difference to obtain terminal temperature peak difference;
judging whether the terminal temperature peak difference exceeds a balance threshold value or not;
and when the terminal temperature peak difference exceeds a balance threshold value, breaking and switching off the ammeter to be tested.
9. The electric energy meter according to claim 8, wherein the induction unit is a triode;
the collector of the triode is grounded, the emitter of the triode is connected to the acquisition end of the processor, and the base of the triode is connected to the constant-voltage power supply.
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