CN102749554A - Electric power circuit fault detecting system - Google Patents
Electric power circuit fault detecting system Download PDFInfo
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- CN102749554A CN102749554A CN2012102026721A CN201210202672A CN102749554A CN 102749554 A CN102749554 A CN 102749554A CN 2012102026721 A CN2012102026721 A CN 2012102026721A CN 201210202672 A CN201210202672 A CN 201210202672A CN 102749554 A CN102749554 A CN 102749554A
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Abstract
The invention discloses an electric power circuit fault detecting system which is used for detecting electric power circuit faults and conducting remote alarming. The electric power circuit fault detecting system comprises a digital fault indicator, a data collector and a main controller. The digital fault indicator is used for detecting real-time data of the electric power circuit and outputting state information of the electric power circuit according to the real-time data. The data collector and the digital fault indicator form a communication network through short-distance wireless modulation, and the data collector is used for collecting the state information sent by the digital fault indicator and turning the state information into a data packet. The main controller is used for receiving the data packet sent by the data collector and judging fault points and types according to information in the data packet. The electric power circuit fault detecting system can achieve remote alarming of the electric power circuit faults and detecting of various electric power circuit faults.
Description
Technical field
The present invention relates to the electroporation field, particularly a kind of feeder line fault detection system.
Background technology
Electric power line fault indicator is to be applied on electric line, power cable and the switch cubicle turnover line, is used to indicate the device of fault current circulation.In case line failure, the track walker can be by the alarm indication of indicator, and the localization of faults is rapidly fixed a breakdown, and changes in the past blindly line walking, and segmentation is closed a floodgate and sent electricity to search the backward way of fault.But traditional fault detector has adopted Analogical Circuit Technique and small shell package design; Realize that function is too simple, the type of detection failure is also too single, and needs the on-the-spot tour of track walker; Can't realize the remote failure warning, have very big technical limitation.
Summary of the invention
The technical matters that the present invention will solve is that feeder line fault is detected and remote alarms.
To achieve these goals, the invention provides a kind of feeder line fault detection system, comprising: the digital fault indicator is used to detect the real time data of power circuit, according to the status information of real time data output power circuit; Data acquisition unit is formed communication network with said digital fault indicator through short-distance wireless frequency modulation, is used to gather the status information that said digital fault indicator sends, and said status information is processed packet; Master controller is used to receive the packet that said data acquisition unit sends, and judges the trouble spot and the fault type of power circuit according to the information in the packet.
Alternatively, said digital fault indicator and data acquisition unit have the unique mailing address in the nybble whole world respectively, are used for the identification of said data acquisition unit to digital fault detector.
Alternatively, said data acquisition unit also has a byte IEC60870-5-101 protocol communication address, is used for the Address Recognition between said master controller and the digital collection device.
Alternatively, carry out communication through the GPRS public network between said data acquisition unit and the master controller.
Alternatively, the APN passage through the GPRS public network carries out communication between said data acquisition unit and the master controller.
Alternatively, said digital fault indicator comprises: current detection circuit, be couple to the lead of power circuit, and be used to detect the current status of power circuit; The wire insulation voltage detecting circuit is couple to the lead of power circuit, is used to detect the Leakage Current of said lead; Temperature sensing circuit is couple to the lead of power circuit, is used to detect the temperature of said lead; From the power taking circuit, be couple to the lead of power circuit, be used for from power circuit induction power taking electric current; Microcontroller; Be couple to the output terminal of current detection circuit, wire insulation voltage detecting circuit and temperature sensing circuit; Be used for the real time data of the power circuit that receives is compared with the state threshold of the power circuit of presetting, draw the status information of power circuit.
Alternatively, said current detection circuit comprises: first current transformer, the primary current of the power line lead that is used for sampling; The signal rectification filtering circuit is used to receive the secondary current that first current transformer is exported, output flat ripple signal, half-wave voltage signal and trap signal; First analog to digital conversion circuit, the flat ripple signal, half-wave voltage signal and the trap conversion of signals that are used for analog form are the receivable digital signal of microcontroller.
Alternatively, said wire insulation voltage detecting circuit comprises: the electric field induction sheet, be couple to power line lead, and be used to detect the Leakage Current of lead; The signal rectification filtering circuit is used to receive the induced signal of electric field induction sheet, output lead insulation voltage detection signal; Second analog to digital conversion circuit is used for converting the wire insulation voltage detection signal of analog form into microcontroller receivable digital signal.
Alternatively, said temperature sensing circuit comprises: thermal conductive metal plate directly contacts with power line lead; Temp probe, an end contacts with thermal conductive metal plate, other end output temperature detection signal; Signal amplification circuit, its input end is couple to the other end of temp probe, the temperature detection signal of output terminal output through amplifying of signal amplification circuit; The 3rd analog to digital conversion circuit is used for converting the temperature detection signal of analog form into microcontroller receivable digital signal.
Alternatively, saidly comprise from the power taking circuit: second current transformer, be couple to power line lead, be used for obtaining the power taking electric current through electromagnetic induction; The power taking current conversion circuit carries out conversion to the power taking electric current, the electric energy of output digital fault indicator available form.
The invention has the beneficial effects as follows:
(1) realization is to the reliable detection and the remote alarms of feeder line fault;
(2) can detect multiple feeder line fault effectively.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work property, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the circuit block diagram of feeder line fault detection system of the present invention;
Fig. 2 is the circuit block diagram of digital fault indicator among Fig. 1;
Fig. 3 is the circuit diagram of current detection circuit among Fig. 2;
Fig. 4 is the circuit diagram of wire insulation voltage detecting circuit among Fig. 2.
Embodiment
To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
Fig. 1 is the circuit block diagram of feeder line fault detection system of the present invention.
As shown in Figure 1; Digital fault indicator 20 mainly is installed in transformer station's 10 outlets, switch load side, built on stilts branch line, cable turnover line and basic routing line segmentation place; Be used to detect the real time data of power circuit; According to the status information of real time data output power circuit, to realize on-line monitoring, fault detect and location to power circuit.For example; Data such as the load current of digital fault indicator 20 detection power circuits, short circuit action current, ground current, landing operation electric current, line-to-earth voltage, conductor temperature; Judge the failure message of power circuit according to these data; The status information of output power circuit, the operational data when failure message when status information comprises fault and normal operation.
Shown in Figure 2 is the circuit block diagram of digital fault indicator among Fig. 1.
As shown in Figure 2, the digital fault indicator comprises: current detection circuit 201, wire insulation voltage detecting circuit 202, temperature sensing circuit 203, from power taking circuit 204 and microcontroller 205.
Current detection circuit 201 is couple to power line lead 50, is used for detecting the current status of power line lead 50; Wire insulation voltage detecting circuit 202 is couple to the lead 50 of power circuit, is used to detect the Leakage Current of lead 50, through the Leakage Current of detection lead 50, and then the insulation voltage of detection lead 50; Temperature sensing circuit 203 is couple to power line lead 50, is used to detect the temperature of lead 50; From power taking circuit 204, be couple to power line lead 50, be used for from power line lead 50 induction power taking electric currents; Microcontroller 205 is couple to the output terminal of current detection circuit 201, wire insulation voltage detecting circuit 202 and temperature sensing circuit 203; Be used for the real time data of the power circuit that receives is compared with the state threshold of the power circuit of presetting, draw the status information of power circuit; Microcontroller 205 also with from power taking circuit 204 couples mutually, the power taking voltage of power-supply circuit 204 is monitored the power taking operation of output power taking control signal control power-supply circuit 204.
Fig. 3 is the circuit diagram of current detection circuit among Fig. 2.
As shown in Figure 3, current detection circuit comprises: first current transformer 2011, the primary current of the power line lead 50 that is used for sampling; Signal rectification filtering circuit 2012 is used to receive the secondary current that first current transformer 2011 is exported, output flat ripple signal, half-wave voltage signal and trap signal; Flat wave circuit 2014 receives flat ripple signal, according to the zero-sequence current of load current, short-circuit current and the threephase cable of putting down ripple signal measurement single-phase overhead lead; Half-wave circuit 2015 receives half-wave voltage signal, measures short trouble according to half-wave voltage signal later reclosing power failure gap and inrush current prevention malfunction warning take place; Trap circuit 2016 receives the trap signal, is used to filter first-harmonic, three times and quintuple harmonics electric current, and extracts the transient state ground current; First analog to digital conversion circuit 2013, the flat ripple signal, half-wave voltage signal and the trap conversion of signals that are used for analog form are digital signal and the input end that is sent to microcontroller 205.First current transformer 2011 among Fig. 3 is merely schematic; First current transformer 2011 specifically comprises the current coil of coiling on magnetic conductive axis and the magnetic conductive axis, left column, right column and the moving plate that permeability magnetic material is processed; Above-mentioned magnetic conductive component is formed the magnetic circuit of a closure; Magnetic conductive axis employing material mixture ratio is that 3: 1 iron-nickel alloy and process high-temperature heat treatment forms, and left column, right column and moving plate adopt the 430Ti corrosion resistant plate to form through high-temperature heat treatment.
Fig. 4 is the circuit diagram of wire insulation voltage detecting circuit among Fig. 2.
As shown in Figure 4, the wire insulation voltage detecting circuit comprises: electric field induction sheet 2021, be couple to power line lead 50, and be used to detect the Leakage Current of lead 50, calculate the insulation voltage of lead 50 through Leakage Current; Signal rectification filtering circuit 2022; Be used to receive the induced signal of electric field induction sheet 2021; Output lead insulation voltage detection signal; Signal rectification filtering circuit 2022 comprises the body capacitance negative plate, constitutes complete signal circuit together by power line lead 50, electric field induction sheet 2021, body capacitance negative plate and space stray capacitance, and wherein the body capacitance negative plate is as signal ground; Second analog to digital conversion circuit 2023 is used for the A/D input end that wire insulation voltage detection signal with analog form converts digital signal into and is sent to microcontroller 205.Electric field induction sheet 2021 among Fig. 4 is merely schematically, and those skilled in the art can select for use any suitable electric field induction sheet that power line lead is sampled.
Temperature sensing circuit 203 among Fig. 2 specifically comprises: with the thermal conductive metal plate that power line lead 50 directly contacts, be used for the temperature of conductive leads 50; With the contacted temp probe of thermal conductive metal plate, the other end output temperature detection signal of temp probe; Signal amplification circuit, its input end is couple to the other end of temp probe, the temperature detection signal of output terminal output through amplifying of signal amplification circuit; The 3rd analog to digital conversion circuit is used for the input end that temperature detection signal with analog form converts digital signal into and is sent to microcontroller 205.For example, temp probe is made up of temperature sensor chip LM94022, cylindrical metal case and inside stuffing, and the enclosure interior filling material is the silica flour that insulativity is high, thermal conductivity is good, and surface of shell uses epoxy resin to seal admittedly.Temp probe is installed on the top encapsulating face of digital fault indicator; And fix by encapsulating; The exposed part of temp probe is enclosed within on the thermal conductive metal plate; Digital fault indicator 20 is installed 50 last times of leads, and lead 50 can directly be pressed on the thermal conductive metal plate, and the temperature of lead 50 is directly conducted to temp probe through thermal conductive metal plate.
First analog to digital conversion circuit of feeder line fault detection system of the present invention, second analog to digital conversion circuit and the 3rd analog to digital conversion circuit; Can adopt discrete element to realize; Also can adopt the analog to digital conversion circuits that are integrated in microcontroller 205 inside to realize; And carry out dormancy and wake timing sampling control up by program, to reduce Overall Power Consumption.
Specifically comprising among Fig. 2 from the power taking circuit: second current transformer, be couple to power line lead 50, be used for obtaining the power taking electric current through electromagnetic induction; The power taking current conversion circuit carries out conversion to the power taking electric current, the electric energy of output digital fault indicator 50 available forms.For example; First current transformer 2011 in the current detection circuit 201 is except being used for current measurement; Also can be used for online power taking; On the current coil basis, add the power taking coil again, just can obtain certain power taking electric current, the power taking current conversion circuit carries out current-voltage conversion, super capacitor energy-storage to the power taking electric current and the voltage stabilizing conversion of boosting just can provide complete machine working power and wireless telecommunications power supply for the digital fault indicator.Second current transformer specifically comprises the current coil of coiling on magnetic conductive axis and the magnetic conductive axis, left column, right column and the moving plate that permeability magnetic material is processed, and above-mentioned magnetic conductive component is formed the magnetic circuit of a closure.
Feeder line fault detection system of the present invention can realize the remote alarms of feeder line fault, realizes multiple feeder line fault is detected.
The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a feeder line fault detection system is characterized in that, comprising:
The digital fault indicator is used to detect the real time data of power circuit, according to the status information of real time data output power circuit;
Data acquisition unit is formed communication network with said digital fault indicator through short-distance wireless frequency modulation, is used to gather the status information that said digital fault indicator sends, and said status information is processed packet;
Master controller is used to receive the packet that said data acquisition unit sends, and judges the trouble spot and the fault type of power circuit according to the information in the packet.
2. feeder line fault detection system as claimed in claim 1 is characterized in that, said digital fault indicator and data acquisition unit have the unique mailing address in the nybble whole world respectively, are used for the identification of said data acquisition unit to digital fault detector.
3. feeder line fault detection system as claimed in claim 2 is characterized in that, said data acquisition unit also has a byte IEC60870-5-101 protocol communication address, is used for the Address Recognition between said master controller and the digital collection device.
4. feeder line fault detection system as claimed in claim 3 is characterized in that, carries out communication through the GPRS public network between said data acquisition unit and the master controller.
5. feeder line fault detection system as claimed in claim 4 is characterized in that, the APN passage through the GPRS public network between said data acquisition unit and the master controller carries out communication.
6. like each described feeder line fault detection system of claim 1 to 5, it is characterized in that said digital fault indicator comprises:
Current detection circuit is couple to the lead of power circuit, is used to detect the current status of power circuit;
The wire insulation voltage detecting circuit is couple to the lead of power circuit, is used to detect the Leakage Current of said lead;
Temperature sensing circuit is couple to the lead of power circuit, is used to detect the temperature of said lead;
From the power taking circuit, be couple to the lead of power circuit, be used for from power circuit induction power taking electric current;
Microcontroller; Be couple to the output terminal of current detection circuit, wire insulation voltage detecting circuit and temperature sensing circuit; Be used for the real time data of the power circuit that receives is compared with the state threshold of the power circuit of presetting, draw the status information of power circuit.
7. feeder line fault detection system as claimed in claim 6 is characterized in that, said current detection circuit comprises:
First current transformer, the primary current of the power line lead that is used for sampling;
The signal rectification filtering circuit is used to receive the secondary current that first current transformer is exported, output flat ripple signal, half-wave voltage signal and trap signal;
First analog to digital conversion circuit, the flat ripple signal, half-wave voltage signal and the trap conversion of signals that are used for analog form are the receivable digital signal of microcontroller.
8. feeder line fault detection system as claimed in claim 6 is characterized in that, said wire insulation voltage detecting circuit comprises:
The electric field induction sheet is couple to power line lead, is used to detect the Leakage Current of lead;
The signal rectification filtering circuit is used to receive the induced signal of electric field induction sheet, output lead insulation voltage detection signal;
Second analog to digital conversion circuit is used for converting the wire insulation voltage detection signal of analog form into microcontroller receivable digital signal.
9. feeder line fault detection system as claimed in claim 6 is characterized in that, said temperature sensing circuit comprises:
Thermal conductive metal plate directly contacts with power line lead;
Temp probe, an end contacts with thermal conductive metal plate, other end output temperature detection signal;
Signal amplification circuit, its input end is couple to the other end of temp probe, the temperature detection signal of output terminal output through amplifying of signal amplification circuit;
The 3rd analog to digital conversion circuit is used for converting the temperature detection signal of analog form into microcontroller receivable digital signal.
10. feeder line fault detection system as claimed in claim 6 is characterized in that, saidly comprises from the power taking circuit:
Second current transformer is couple to power line lead, is used for obtaining the power taking electric current through electromagnetic induction;
The power taking current conversion circuit carries out conversion to the power taking electric current, the electric energy of output digital fault indicator available form.
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| CN2012102026721A CN102749554A (en) | 2012-06-19 | 2012-06-19 | Electric power circuit fault detecting system |
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| CN2012102026721A CN102749554A (en) | 2012-06-19 | 2012-06-19 | Electric power circuit fault detecting system |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103487726A (en) * | 2013-10-15 | 2014-01-01 | 浙江宝明电气有限公司 | System for online monitoring faults of electric power line |
| CN103645417A (en) * | 2013-11-27 | 2014-03-19 | 国家电网公司 | Pure internet access-prepositioned data acquisition method |
| CN103731182A (en) * | 2012-10-12 | 2014-04-16 | 深圳市金正方科技股份有限公司 | Method and system for real-time monitoring of power line carrier communication |
| CN104316107A (en) * | 2014-10-28 | 2015-01-28 | 成都峰达科技有限公司 | Electric transmission line monitoring system |
| CN106610461A (en) * | 2015-10-27 | 2017-05-03 | 国网智能电网研究院 | Fast fault detection method and fast fault detection system for high-voltage DC equipment |
| CN107516870A (en) * | 2017-10-12 | 2017-12-26 | 国家电网公司 | A kind of cable run automatic reclosing method based on short circuit current heat localization process |
| CN108535603A (en) * | 2018-05-23 | 2018-09-14 | 安徽国电京润电力科技有限公司 | A kind of power circuit automatic fault detection positioning system |
| CN110299932A (en) * | 2019-06-12 | 2019-10-01 | 国网江苏省电力有限公司南京供电分公司 | Distribution network and equipment running status online recognition method based on power line signal |
| CN110703658A (en) * | 2019-10-28 | 2020-01-17 | 深圳供电局有限公司 | Virtual power plant remote monitoring system |
| CN111600636A (en) * | 2020-06-03 | 2020-08-28 | 北京兴华瑞麒科技有限公司 | Intelligent communication system capable of automatically taking electricity |
| CN113671305A (en) * | 2021-06-17 | 2021-11-19 | 中国铁路设计集团有限公司 | Comprehensive sensing system for power transmission line |
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| CN103645417A (en) * | 2013-11-27 | 2014-03-19 | 国家电网公司 | Pure internet access-prepositioned data acquisition method |
| CN103645417B (en) * | 2013-11-27 | 2016-08-17 | 国家电网公司 | A kind of pure internet access-prepositioneddata data acquisition method |
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| CN106610461A (en) * | 2015-10-27 | 2017-05-03 | 国网智能电网研究院 | Fast fault detection method and fast fault detection system for high-voltage DC equipment |
| CN107516870A (en) * | 2017-10-12 | 2017-12-26 | 国家电网公司 | A kind of cable run automatic reclosing method based on short circuit current heat localization process |
| CN108535603A (en) * | 2018-05-23 | 2018-09-14 | 安徽国电京润电力科技有限公司 | A kind of power circuit automatic fault detection positioning system |
| CN110299932A (en) * | 2019-06-12 | 2019-10-01 | 国网江苏省电力有限公司南京供电分公司 | Distribution network and equipment running status online recognition method based on power line signal |
| CN110299932B (en) * | 2019-06-12 | 2022-04-12 | 国网江苏省电力有限公司南京供电分公司 | Power distribution network and equipment running state online identification method based on power line signal |
| CN110703658A (en) * | 2019-10-28 | 2020-01-17 | 深圳供电局有限公司 | Virtual power plant remote monitoring system |
| CN111600636A (en) * | 2020-06-03 | 2020-08-28 | 北京兴华瑞麒科技有限公司 | Intelligent communication system capable of automatically taking electricity |
| CN113671305A (en) * | 2021-06-17 | 2021-11-19 | 中国铁路设计集团有限公司 | Comprehensive sensing system for power transmission line |
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Application publication date: 20121024 |