CN203054159U - Power distribution network fault positioning device based on zero-sequence current synchronous measurement - Google Patents

Power distribution network fault positioning device based on zero-sequence current synchronous measurement Download PDF

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Publication number
CN203054159U
CN203054159U CN 201320004864 CN201320004864U CN203054159U CN 203054159 U CN203054159 U CN 203054159U CN 201320004864 CN201320004864 CN 201320004864 CN 201320004864 U CN201320004864 U CN 201320004864U CN 203054159 U CN203054159 U CN 203054159U
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CN
China
Prior art keywords
terminal
zero
sequence current
main website
distribution network
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CN 201320004864
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Chinese (zh)
Inventor
林道鸿
蔡志伟
蔡渊
李砚
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海南电力技术研究院
北京丹华昊博电力科技有限公司
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Priority to CN 201320004864 priority Critical patent/CN203054159U/en
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Publication of CN203054159U publication Critical patent/CN203054159U/en

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Abstract

The utility model discloses a power distribution network fault positioning device based on zero-sequence current synchronous measurement, comprising a main station and a terminal, wherein the terminal is arranged on a overhead line tower, or in a cable branch box or a ring main unit, an input end of the terminal receives phase current and zero current signals at a secondary side of a circuit CT, and the terminal is connection with the main station through optical fiber communication or mobile communication. The positioning device can determine the fault point quickly and accurately, and is applicable to various failure condition of metallic grounding, grounding through voltaic arcs, grounding through transition resistors and the like. The positioning device can realize the ''two remote'' function, reduces the investment of users, and has high cost performance.

Description

Distribution network failure locating device based on the zero-sequence current synchro measure

Technical field

The utility model relates to a kind of power technology and equipment, is particularly useful for 3~35kV based on the power distribution network of pole line, can quick and precisely locate when being short-circuited fault or singlephase earth fault.

Background technology

China 3~35kV power distribution network extensively adopts the small current neutral grounding mode.The fault of power distribution network comprises short trouble and singlephase earth fault.The feature of these two kinds of faults is different fully, but all must find the trouble spot as early as possible, and this has just proposed fault-location problem.

The distribution network failure orientation problem is not well solved for a long time, and on-the-spot toward the method for contact at the artificial line walking of employing, artificial line walking has not only expended a large amount of manpower and materials, and has prolonged power off time, influences power supply safety.The scene has three kinds of methods to locate automatically at present, and first method is to inject high-frequency signal from PT, detect this signal along circuit and determine abort situation, but because line distribution capacitance forms path to high-frequency signal, therefore the location is inaccurate when resistance grounded.Second method is to utilize the method for fault detector, because fault detector can only be measured phase current, can not measure zero-sequence current, thus better for the short trouble effect, but very low for the singlephase earth fault locating accuracy.The third method is that the intelligent switch of built-in CT is installed, though this method can be measured zero-sequence current, the accurate positioning of singlephase earth fault is also better, invests bigger.

The utility model content

The purpose of this utility model is to overcome the deficiency on the prior art, and a kind of locating device at distribution network failure is provided.The localization of faults quickly and accurately of this locating device, and be applicable to metallic earthing, through arcing ground, through various faults situations such as transition resistance eutral groundings.Locating device can be realized " two is distant " function, has reduced user's investment, and cost performance is higher.

To achieve these goals, the technical solution of the utility model is: a kind of distribution network failure locating device based on the zero-sequence current synchro measure is provided, comprises two parts of main website and terminal:

Described terminal is located on the overhead transmission line shaft tower, in cable branch box or the ring main unit, phase current and the zero sequence current signal of terminal input end receiving lines CT secondary side, terminal also is connected by optical fiber communication or mobile communication with main website;

Described terminal is utilized GPS synchro measure signal, guarantees that the signal that the strange land is measured has the markers comparability;

Described overhead transmission line CT is the ferromagnetic formula structure of opening, is nested with on described overhead transmission line.

Described main website is located in the transformer station or the dispatching center, and main website comprises optical fiber communication module and mobile communication module.

Described terminal comprises power pack, A/D modular converter, GPS module, the mobile communication module that connects in turn.

Described terminal also comprises solar recharging module and optical fiber transceiver module.The solar recharging module is used to the terminal power supply.

Described main website is industrial control computer.

Terminal is calculated the amplitude of phase current, the amplitude of zero-sequence current during normal the operation, and the result is uploaded to main website, is shown by main website; After breaking down, terminal adopts fourier algorithm that phase current and zero-sequence current are analyzed, and amplitude and the phase information of phase current and zero-sequence current sent to main website, and main website calculates fault section according to all terminal information analysis-by-synthesis.The main website algorithm adopts the Dijkstra searching algorithm of graph theory, at first begins to analyze from first terminal, and out-of-limit just the continuation searched downstream for discovery phase current or zero-sequence current; When two take-off points occurring, continue to search to phase current or the out-of-limit terminal place branch of zero-sequence current; Until finding that out-of-limit and n+1 the terminal current of n terminal current do not have when out-of-limit, failure judgement is between n terminal and n+1 terminal.

Fault locator of the present utility model realizes localization of fault by the following method:

Described terminal is the microcomputer type device that is applicable to outdoor use, is installed on the pole line shaft tower, in cable branch box or the ring main unit, inserts the CT signal.Terminal is made up of power pack, A/D, GPRS module, mobile communication module for measuring phase current and zero sequence current signal and sending failure message to main website.

Described main website is an industrial control computer, is installed in the transformer station or the dispatching center, is used for the information of receiving terminal and carries out the localization of fault computing, is made up of optical fiber communication module, mobile communication module.

Terminal is calculated the amplitude of phase current, the amplitude of zero-sequence current during normal the operation, and the result is uploaded to main website, is shown by main website; After breaking down, terminal adopts fourier algorithm that phase current and zero-sequence current are analyzed, and amplitude and the phase information of phase current and zero-sequence current sent to main website, and main website calculates fault section according to all terminal information analysis-by-synthesis.The main website algorithm adopts the Dijkstra searching algorithm of graph theory, at first begins to analyze from first terminal, and out-of-limit just the continuation searched downstream for discovery phase current or zero-sequence current; When two take-off points occurring, continue to search to phase current or the out-of-limit terminal place branch of zero-sequence current; Until finding that out-of-limit and n+1 the terminal current of n terminal current do not have when out-of-limit, failure judgement is between n terminal and n+1 terminal.

Advantage of the present utility model is as follows:

1, can accurately determine short trouble and singlephase earth fault place section.

2, the phase place of zero-sequence current can be accurately measured, the orientation problem under the single-phase earthing situation can be effectively solved.

3, can under band singlephase earth fault ruuning situation, locate, improve reliability of system operation.

4, technology maturation, reliability height are applicable to the power distribution network of 3~35kV isolated neutral or neutral by arc extinction coil grounding, are applicable to metallic earthing, through arcing ground, through various faults situations such as transition resistance eutral groundings.

Description of drawings

Fig. 1 is structural representation of the present utility model;

The circuit diagram of short-circuit current when Fig. 2 is short trouble;

The circuit diagram of zero-sequence current when Fig. 3 is singlephase earth fault;

Fig. 4 is the schematic diagram of terminal.

Embodiment

A kind of new distribution network failure locating device that the utility model proposes, its principle is to utilize the high precision overhead transmission line CT with socket joint type structure accurately to measure phase current and the zero-sequence current of overhead transmission line in real time, the fault post-positioning device is determined fault section according to phase current information when being short-circuited, after singlephase earth fault took place, locating device was determined fault section according to zero-sequence current information.

Based on the locating device of the utility model development by circuit CT, two parts of terminal and main website.Described circuit CT is the ferromagnetic formula structure of opening, can open dimidiation and be socketed on the overhead transmission line, has avoided the difficulty of construction that overhead transmission line is disconnected; The CT precision reaches 1 grade, has fully guaranteed the accuracy of measuring.Each check point need be installed 3 CT at the ABC three-phase, and the secondary side parallel connection with CT just can obtain zero sequence current signal like this.

Described terminal is the microcomputer type device that is applicable to outdoor use, is installed on the pole line shaft tower, in cable branch box or the ring main unit, inserts the CT signal.Terminal is made up of power pack, A/D, GPRS module, mobile communication module for measuring phase current and zero sequence current signal and sending failure message to main website.Terminal is calculated the amplitude of phase current, the amplitude of zero-sequence current during normal the operation, and the result is uploaded to main website, is shown by main website; After breaking down, terminal adopts fourier algorithm that phase current and zero-sequence current are analyzed, and amplitude and the phase information of phase current and zero-sequence current sent to main website, and main website calculates fault section according to all terminal information analysis-by-synthesis.

Described main website is an industrial control computer, is installed in the transformer station or the dispatching center, is used for the information of receiving terminal and carries out the localization of fault computing, is made up of optical fiber communication module, mobile communication module.The main website algorithm adopts the Dijkstra searching algorithm of graph theory, at first begins to analyze from first terminal, and out-of-limit just the continuation searched downstream for discovery phase current or zero-sequence current; When two take-off points occurring, continue to search to phase current or the out-of-limit terminal place branch of zero-sequence current; Until finding that out-of-limit and n+1 the terminal current of n terminal current do not have when out-of-limit, failure judgement is between n terminal and n+1 terminal.

As shown in Figure 1, locating device by circuit CT C(when using many group circuit CT, use C-1, C-2 respectively ... C-n represents), terminal B(is when using many groups terminal corresponding with CT, a plurality of terminals are used B-1, B-2 respectively ... B-n represents) and two parts of the A of main website, wherein overhead transmission line CT and terminal are used, and install in a plurality of positions of circuit.Terminal is the low-power consumption microcomputer type device that is applicable to outdoor use, is installed on the pole line shaft tower, in cable branch box or the ring main unit, inserts the CT signal.Terminal is made up of power pack, A/D, GPS module, mobile communication module and solar recharging module for measuring phase current and zero sequence current signal and sending failure message to main website.Main website is an industrial control computer, is installed in the transformer station or the dispatching center, is used for the information of receiving terminal and carries out the localization of fault computing, is made up of optical fiber communication module, mobile communication module.

During short trouble the equivalent circuit of short-circuit current as shown in Figure 2, circuit is made of backbone and branch line.Wherein U is line voltage, and I is the failed shorted electric current.Because short-circuit current flows into short dot from power supply during short trouble, so will flow through the very big short-circuit current of amplitude on from power supply to the path between the short dot, will can not detect short-circuit current but not (comprise part backbone and branch line) on the path of fault.Therefore by judging that the detected phase current of each terminal just can failure judgement place section.The main website algorithm adopts the first search algorithm that gos deep into of graph theory, at first begins to analyze from first terminal, and the discovery phase current is searched by out-of-limit just continuation the downstream; When two take-off points occurring, out-of-limit terminal place branch continues to search to phase current; Until finding that out-of-limit and n+1 the terminal phase current of n terminal phase current do not have when out-of-limit, failure judgement is between n terminal and n+1 terminal.

The equivalent circuit in zero sequence loop as shown in Figure 3 during fault.U wherein 0Be residual voltage, I is the real component of zero-sequence current.The direction of zero-sequence current all is the end that flows to bus and circuit from the trouble spot.Though in each branch, zero-sequence current is arranged during singlephase earth fault, but the zero-sequence current in most cases from bus to the path between the earth point is maximum, and detected zero-sequence current is very little but not (comprise part backbone and branch line) on the path of fault.Therefore by judging that the detected zero-sequence current electric current of each terminal just can failure judgement place section.The main website algorithm adopts the first search algorithm that gos deep into of graph theory, at first begins to analyze from first terminal, and the discovery zero-sequence current is searched by out-of-limit just continuation the downstream; When two take-off points occurring, out-of-limit terminal place branch continues to search to zero-sequence current; Until finding that out-of-limit and n+1 the terminal zero-sequence current of n terminal zero-sequence current do not have when out-of-limit, failure judgement is between n terminal and n+1 terminal.

The principle of terminal is made up of CPU, power pack, A/D, GPS module, mobile communication module, optical fiber transceiver module as shown in Figure 4.Constituting power pack by small current mutual inductor and resistance R z is transformed to power line current and exchanges 0 to 5V signal, exchange 0 to 5V signal and be input among the input operational amplifier OP07 OP07, reference voltage source AD584 and resistance R 1, R2, Rf composition totalizer.Input operational amplifier OP07 output is received on the P1.0 pin of 8051F120, and 8051F120 contains inside ADC and additional reference voltage source, and simulating signal is carried out the AD sampling, and sampling back CPU calculates signal characteristic.8051F120 by the P4.0-P4.7 in these two I/O mouths of P4 and P5 and P5.0-P5.6 contact respectively with 15 contacts of the Sub HD Pin15 port of mobile communication module M1206 corresponding linking to each other one by one, be used for driving mobile communication module M1206, adopt mobile communication to send characteristic to main website.HFBR14 is the optical fiber sending module, and HFBR24 is optic fiber transceiver module, and the 8051F120 chip is connected to the optical fiber transceiver module by UART0, adopts the optical fiber communication mode to send characteristic to main website.8051F120 is used for reception pulse per second (PPS) and standard time clock data by P6.1, P6.2, P6.3, P6.4 and corresponding linking to each other of port TXA, RXA, RXB, 1PPS as the GPS module M-87 of slave computer GPS module.

Above disclosed only is preferred embodiment of the present utility model, can not limit the interest field of the utility model certainly with this, and therefore the equivalent variations of doing according to the utility model claim still belongs to the scope that the utility model is contained.

Claims (4)

1. based on the distribution network failure locating device of zero-sequence current synchro measure, comprise two parts of main website and terminal, it is characterized in that:
Described terminal is located on the overhead transmission line shaft tower, in cable branch box or the ring main unit, phase current and the zero sequence current signal of terminal input end receiving lines CT secondary side, terminal also is connected by optical fiber communication or mobile communication with main website;
Described main website is located in the transformer station or the dispatching center, and main website comprises optical fiber communication module and mobile communication module.
2. the distribution network failure locating device based on the zero-sequence current synchro measure as claimed in claim 1 is characterized in that: described terminal comprises power pack, A/D modular converter, GPS module, the mobile communication module that connects in turn.
3. the distribution network failure locating device based on the zero-sequence current synchro measure as claimed in claim 2, it is characterized in that: described terminal also comprises solar recharging module and optical fiber transceiver module.
4. the distribution network failure locating device based on the zero-sequence current synchro measure as claimed in claim 1, it is characterized in that: described main website is industrial control computer.
CN 201320004864 2013-01-07 2013-01-07 Power distribution network fault positioning device based on zero-sequence current synchronous measurement CN203054159U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014089899A1 (en) * 2012-12-10 2014-06-19 国家电网公司 Distribution network phase-to-earth fault location method and location device based on transient signal wavelet transformation
CN106771855A (en) * 2016-11-30 2017-05-31 国网河南省电力公司安阳供电公司 A kind of electrified locating device for single-phase earth fault of electric distribution network based on smart machine
CN108761277A (en) * 2018-07-26 2018-11-06 国网福建省电力有限公司莆田供电公司 A kind of cable and junction malfunction indicator and on-line monitoring system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014089899A1 (en) * 2012-12-10 2014-06-19 国家电网公司 Distribution network phase-to-earth fault location method and location device based on transient signal wavelet transformation
CN106771855A (en) * 2016-11-30 2017-05-31 国网河南省电力公司安阳供电公司 A kind of electrified locating device for single-phase earth fault of electric distribution network based on smart machine
CN108761277A (en) * 2018-07-26 2018-11-06 国网福建省电力有限公司莆田供电公司 A kind of cable and junction malfunction indicator and on-line monitoring system

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EXPY Termination of patent right or utility model
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Granted publication date: 20130710

Termination date: 20150107