CN201555891U - Nine-current and four-voltage measuring device - Google Patents
Nine-current and four-voltage measuring device Download PDFInfo
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- CN201555891U CN201555891U CN2009202167545U CN200920216754U CN201555891U CN 201555891 U CN201555891 U CN 201555891U CN 2009202167545 U CN2009202167545 U CN 2009202167545U CN 200920216754 U CN200920216754 U CN 200920216754U CN 201555891 U CN201555891 U CN 201555891U
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Abstract
A nine-current and four-voltage measuring device relates to module type equipment used for monitoring multi-way voltage and current signals of an electric distribution network in an electric power system. The utility model fully takes account of the electromagnetic compatibility EMC technology and the signal isolation technology; and a control power supply of the nine-current and four-voltage measuring device adopts the capacitance screening technology to satisfy the field demand in the power distribution network. The communication function is realized in an RS485 standard MODBUS protocol communication manner; analog digital signals are converted and current and voltage signals are calculated through an electric energy metering chip with higher stability and accuracy; and the communication is achieved through an interface SPI bus of serial peripheral equipment and a singlechip, so as to realize measurement and monitoring of multi-way electric energy parameters of the electric distribution network in the electric power system. The measuring module with the advantages of portability and simple operation is suitable for complex field installation and application for monitoring personnel in the field.
Description
Technical field
The utility model relates to the power monitoring field.Be specially adapted to the remote on-line monitoring of multichannel power quality parameter.
Technical background
Along with the progressive economic growth of science and technology, global power load soaring year by year, the problem that reduces electric power accident and electric power safety highlights.Electric power safety becomes the most important thing in the global electric power network field already, and nineteen sixty-eight, the U.S. just set up electric reliability association, renames North America electric reliability association as in 1981, and its main task is exactly to assist to finish the reliability of various countries, North America electric system.In order to prevent that power failure from leading to heavy accident, power monitoring promoting the use of progressively in electric system.Apparatus of electrical monitoring equipment and instrument are existing many in the domestic electric system, but the major part more single monitoring instrument that is monitoring function, and distribution system is increasing to the demand of multifunctional monitoring equipment in the electric system.Domestic energy monitoring apparatus is especially less relatively to the heterogeneous monitoring equipment of the multichannel of electric current and voltage.The utility model can be monitored the multiloop parameters of electric power simultaneously, replaces the simple function instrument, thereby can reduce the wholesale cost of system for distribution network of power network.
The utility model is mainly used in the voltage and current signal of distribution line in the monitoring electric system, can realize the monitoring of a plurality of single-phase or three-phase loop current and busbar voltages simultaneously, and use that 15 LED light are used to refer to equipment state, current/voltage state, whether communication is normal, whether equipment is charged.Its control power supply is for exchanging 85V～265V, and its measuring accuracy satisfies 0.2%.
Summary of the invention
The purpose of this utility model is to solve above-mentioned defective in the prior art.
A kind of nine electric currents of proposition of the present utility model for this reason four voltage measuring apparatus, it comprises: power module, signal acquisition circuit, control circuit, communicating circuit, LED display circuit, wherein said signal acquisition circuit comprises current acquisition circuit, voltage collection circuit, single-chip microcomputer, three accurate three-phase electrical energy computation chips, described control circuit comprises single-chip microcomputer, reset circuit and artificial circuit, it is characterized in that: described power module is exported two groups of 5V power supplys, one the tunnel specially for communicating circuit provides working power, and another road provides working power for other circuit; The input end of current acquisition circuit is connected with measured ac current signal input, voltage collection circuit is connected with the input of measured alternating voltage, described current acquisition circuit, described voltage collection circuit all link to each other with the input end of three described accurate three-phase electrical energy computation chips, described three-phase electrical energy computation chip is connected with described single-chip microcomputer by the Serial Peripheral Interface spi bus, the LED display circuit is connected with single-chip microcomputer by flexible flat cable FFC cable, and reset circuit also is connected with single-chip microcomputer respectively with artificial circuit.Described current acquisition circuit uses 9 current transformers to carry out the ac current signal collection, and voltage transformer (VT) carries out the collection of voltage signal.Described communicating circuit is connected with the supervisory system of distribution network by the RS485 interface.
Description of drawings
Fig. 1 is a scheme Design equivalence block diagram of the present utility model.
Fig. 2 is a shell structure synoptic diagram of the present utility model.
Fig. 3 is mode of connection figure of the present utility model.
Fig. 4 is Acquisition Circuit partly the circuit diagram consistent with table 1.
Embodiment
Below in conjunction with embodiment, the utility model is further specified.Following embodiment only is illustrative, and nonrestrictive, can not limit protection domain of the present utility model with following embodiment.
The utility model uses ATmega16 as system CPU, control three accurate three-phase electrical energy computation chips and carry out signals collecting and analysis, realize the collection of analog quantity, adopted typical R S485 communicating circuit, the use spi bus is finished the communication with single-chip microcomputer, thereby realizes the measurement of nine road electric currents, four road voltage signals.Wherein each three-phase electrical energy computation chip is measured three road current signals and three road voltage signals.The metering circuit of one road three-phase electric energy chip only is shown in the accompanying drawing.
The shell structure synoptic diagram is positioned at the LED light on the housing as shown in Figure 2, is the state that is used to refer to measuring current and voltage signal, when voltage signal during greater than 10V, the LED lamp of instructed voltage is lighted, and when current signal during greater than 30mA, the LED lamp of indicator current state is lighted.Three LED lamps that are positioned at the right side are used to refer to power supply, communication transmission, communication accepting state respectively.After device power, the LED lamp (POWER) of indication power supply is in normal bright state.When equipment was in communication state, (RXD TXD) was in blink states to the LED lamp of the state of indication communication.This design is convenient to the on-site supervision personnel and is monitored, and is particularly suitable for complicated scene, and the monitoring personnel can judge whether current distribution system state, equipment state, backstage monitoring communication state etc. are normal by the LED light on the housing.
Be positioned at row housing terminal A of two on the accompanying drawing 2 and terminal B, it is used for the input of signal, access way such as following table 1.
Table 1
This device mainly is made up of single-chip microcomputer, voltage collection circuit, current acquisition circuit, three-phase electrical energy computation chip, communicating circuit and LED display circuit etc.Accompanying drawing 1 reflects the annexation between each circuit.
The scope of input supply voltage is 85V～265V.The utility model uses power module to guarantee that the fluctuation of external control power supply can not influence the stable of its basic circuit power supply.It exports two groups of 5V power supplys, and one the tunnel specially for communicating circuit provides working power, and another road provides working power for other circuit.Power protecting circuit fully takes into account the EMC technical standard, uses isolating devices such as magnetic bead, magnet ring to reduce the electromagnetic interference (EMI) energy.Use ac capacitor to carry out filtering, make an uproar only.Use voltage dependent resistor (VDR) and thermistor can prevent because of the bigger damage power circuit of electric current and voltage fluctuating range.
Communicating circuit is connected with single-chip microcomputer, and it is the utility model and the extraneous interface circuit that carries out communication.This device is connected with the supervisory system of distribution network by the RS485 communication interface, realizes the monitoring of supervisory system to the distribution network parameters of electric power.Adopt the light isolation technology, the internal circuit beyond the protection communicating circuit.Adopt light-coupled isolation device, rectifier bridge and mu balanced circuit to guarantee that the power supply of communicating circuit is stable.Realize the isolation of signal,, guarantee communication quality to reduce noise.
The input end of current acquisition circuit is connected with measured ac current signal input, the output terminal of current acquisition circuit is connected with the input end of three-phase electrical energy computation chip, the input end of voltage collection circuit is connected with the input of measured three-phase alternating voltage, the output terminal of voltage collection circuit is connected with the input of three-phase electrical energy computation chip, and the output of three-phase electrical energy computation chip is connected with single-chip microcomputer.
The current acquisition circuit uses 9 current transformers to carry out the collection of 9 ac current signals respectively, and the current transformer of the utility model practicality is a core-theaded type precision current mutual inductor, finishes the decay of current signal in the distribution system, forms milliampere signal surveyed of level.Mutual inductor housing gabarit can increase the antijamming capability of current acquisition circuit.Fig. 4 is 10～1000 Ω resistance for current acquisition circuit diagram R1, R2, and R3, R4 are 1～2.2K resistance.C1, C2 are 0.001～0.1uF electric capacity.Electric capacity mainly is to be used for carrying out filtering and to make an uproar only.What REFO inserted is about reference voltage 2.4V, and this voltage is provided by the three phase metering chip.I1P and I1N are that the milliampere level of Acquisition Circuit output can be surveyed signal, send into three-phase electrical energy computation chip.
Usually voltage collection circuit can be divided into electric resistance partial pressure mode and mutual inductor mode, and the advantage of electric resistance partial pressure mode is the advantage of the little system good heat dissipation of volume, but its shortcoming is to lack to isolate.And the mode of working voltage mutual inductor both can accomplish that high precision also can satisfy good isolation.
The utility model adopts the voltage transformer (VT) isolation method to carry out the collection of voltage signal, and the input end of voltage transformer (VT) is connected with the input of three-phase alternating voltage signal, and intermediate demand seals in current-limiting resistance, and resistance generally is controlled at about 200K/2W.The power of emphasizing current-limiting resistance mainly is to consider that current-limiting resistance can produce very big heat when absorbing ac voltage signal, if the power of current-limiting resistance is too small, will cause current-limiting resistance hot.And emphasize that the resistance about 200K mainly is for the current signal that guarantees the inflow and outflow voltage transformer (VT) is about 2mA, to guarantee measuring accuracy.
The input of LED display circuit is connected with the output of single-chip microcomputer, the LED display circuit, and state, current-voltage measurement state, the communication that is used for indicating equipment denied unusual etc.The duty of LED display circuit has Single-chip Controlling work.
The control circuit of the reset circuit in the accompanying drawing 1, artificial circuit and monolithic agency cost device, reset circuit mainly is to be used for single-chip microcomputer is effectively resetted, this circuit mainly uses a voltage monitoring chip, when the supply voltage of single-chip microcomputer during less than 3.3V, single-chip microcomputer is resetted.Artificial circuit links to each other with single-chip microcomputer, mainly is to be used for procedure simulation, makes things convenient for the debugging of software program.
Adopt contact pin to connect between control circuit board and the signal acquisition circuit plate, the LED display circuit board is connected by flexible flat cable FFC cable with control circuit board.The integrated circuit design has realized the isolation of strong and weak electricity, the isolation of communication power supply and digital power.Make interference each other be reduced to minimum.This structure is through experimental demonstration repeatedly and get.The current signal of gathering on the signal acquisition circuit plate is 0～5A, the voltage signal of gathering is 0～400V, this strong signal is through Acquisition Circuit, form relative small voltage signal, be sent in the three-phase electrical energy computation chip, such mentality of designing can be avoided the potential safety hazards such as discharge between the stronger voltage and current signal, also can reduce the circuit long signal energy deviation that causes of transmission and reduce problem such as measuring accuracy.
The utility model can use simultaneously with other electric power supervisory control equipment and can not produce and conflict. The utility model can be measured nine road monophase currents and four road voltages simultaneously, also can detect three road three-phase currents and voltage. The equipment of relative measurement function singleness the utlity model has the advantage such as be easy to carry, volume is little, certainty of measurement is high, function is many.
Claims (4)
1. electric current four voltage measuring apparatus, it comprises power module, signal acquisition circuit, control circuit, communicating circuit, LED display circuit, wherein said signal acquisition circuit comprises current acquisition circuit, voltage collection circuit, three accurate three-phase electrical energy computation chips, described control circuit comprises single-chip microcomputer, reset circuit and artificial circuit, it is characterized in that: described power module is exported two groups of 5V power supplys, one the tunnel specially for communicating circuit provides working power, and another road provides working power for other circuit; The input end of current acquisition circuit is connected with measured ac current signal input, voltage collection circuit is connected with the input of measured alternating voltage, described current acquisition circuit, described voltage collection circuit all link to each other with the input end of three described accurate three-phase electrical energy computation chips, described three-phase electrical energy computation chip is connected with described single-chip microcomputer by the Serial Peripheral Interface spi bus, the LED display circuit is connected with single-chip microcomputer by flexible flat cable FFC cable, and reset circuit also is connected with single-chip microcomputer respectively with artificial circuit.
2. nine electric currents, four voltage measuring apparatus according to claim 1, wherein said current acquisition circuit uses 9 current transformers to carry out the ac current signal collection.
3. nine electric currents, four voltage measuring apparatus according to claim 1, wherein said voltage collection circuit adopts voltage transformer (VT) to carry out the collection of voltage signal.
4. nine electric currents, four voltage measuring apparatus according to claim 1, wherein said communicating circuit is connected with the supervisory system of distribution network by the RS485 interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202167545U CN201555891U (en) | 2009-09-22 | 2009-09-22 | Nine-current and four-voltage measuring device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202167545U CN201555891U (en) | 2009-09-22 | 2009-09-22 | Nine-current and four-voltage measuring device |
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| CN201555891U true CN201555891U (en) | 2010-08-18 |
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| CN2009202167545U Expired - Fee Related CN201555891U (en) | 2009-09-22 | 2009-09-22 | Nine-current and four-voltage measuring device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102692538A (en) * | 2012-06-11 | 2012-09-26 | 兰州海红技术股份有限公司 | Multi-path intelligent comprehensive electric quantity detecting device |
| CN102928702A (en) * | 2012-10-25 | 2013-02-13 | 长兴县供电局 | Branch loop monitor |
| CN104155515A (en) * | 2013-05-13 | 2014-11-19 | 苏州工业园区新宏博通讯科技有限公司 | Multipath ammeter |
| CN105182265A (en) * | 2015-09-29 | 2015-12-23 | 中国电力科学研究院 | Metering chip model selection testing system |
| CN106018925A (en) * | 2016-07-15 | 2016-10-12 | 广州开能电气实业有限公司 | DC system intelligent sensor |
| CN113162832A (en) * | 2021-03-23 | 2021-07-23 | 苏州市万松电气有限公司 | Intelligent electrical appliance system |
-
2009
- 2009-09-22 CN CN2009202167545U patent/CN201555891U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102692538A (en) * | 2012-06-11 | 2012-09-26 | 兰州海红技术股份有限公司 | Multi-path intelligent comprehensive electric quantity detecting device |
| CN102928702A (en) * | 2012-10-25 | 2013-02-13 | 长兴县供电局 | Branch loop monitor |
| CN104155515A (en) * | 2013-05-13 | 2014-11-19 | 苏州工业园区新宏博通讯科技有限公司 | Multipath ammeter |
| CN105182265A (en) * | 2015-09-29 | 2015-12-23 | 中国电力科学研究院 | Metering chip model selection testing system |
| CN106018925A (en) * | 2016-07-15 | 2016-10-12 | 广州开能电气实业有限公司 | DC system intelligent sensor |
| CN113162832A (en) * | 2021-03-23 | 2021-07-23 | 苏州市万松电气有限公司 | Intelligent electrical appliance system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| DD01 | Delivery of document by public notice |
Addressee: Bai Yu Document name: Notification of Termination of Patent Right |
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| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100818 Termination date: 20110922 |