CN105891679A - Fault detection system and method for electric power grid - Google Patents

Fault detection system and method for electric power grid Download PDF

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Publication number
CN105891679A
CN105891679A CN201610408569.0A CN201610408569A CN105891679A CN 105891679 A CN105891679 A CN 105891679A CN 201610408569 A CN201610408569 A CN 201610408569A CN 105891679 A CN105891679 A CN 105891679A
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China
Prior art keywords
fault
circuit
fault detector
detector
line
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CN201610408569.0A
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Chinese (zh)
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姹や寒
汤亮
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姹や寒
汤亮
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Priority to CN201610408569.0A priority Critical patent/CN105891679A/en
Publication of CN105891679A publication Critical patent/CN105891679A/en
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08Locating faults in cables, transmission lines, or networks
    • G01R31/081Locating faults in cables, transmission lines, or networks according to type of conductors
    • G01R31/086Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04SSYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00Systems supporting electrical power generation, transmission or distribution
    • Y04S10/50Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
    • Y04S10/52Outage or fault management, e.g. fault detection or location

Abstract

The invention discloses a fault detection system and method for an electric power grid. The power grid is connected with a detection circuit, a plurality of current transformers are arranged on each of branch lines and are used for acquiring current signals on the power grid, the detection circuit is connected with a fault judging circuit, a photoelectric conversion unit, a fault level judging unit and a signal generator are arranged on the fault judging circuit, the fault judging circuit is connected with an alarm processing circuit, and the alarm processing circuit is also connected with a monitoring center. The fault detection system and method disclosed by the invention have the benefit that as the current transformers are arranged on the detection circuit, the current information on the power grid is obtained through the current transformers, and the information of fault signals is determined through the plurality of judging units and is released through an alarm device and the monitoring center, so that the fault can be removed at the highest speed. The fault detection system disclosed by the invention is simple in structure, convenient to operate and lower in cost.

Description

A kind of electric power network fault detection system and fault detection method
Technical field
The invention belongs to electric power network technical field, be specifically related to a kind of electric power network fault detection system and fault detection method.
Background technology
China's power distribution network has that line construction is complicated, various changeable, the feature such as faults frequent is complicated, maintenance workload is big of environment.A certain section of distribution line breaks down, need to investigate fault piecemeal and position occurs, not only working strength is big, but also emergency repair time can be delayed, affect power supply reliability, in actual use, the normal of the electric network terminal equipment such as household electrical appliance, industrial automation equipment, medical apparatus instrument is used and has a very big impact service life by line voltage.At present, the fluctuation of line voltage is relatively big, and especially in rural area, the fluctuation of line voltage is bigger;Too high line voltage often shortens the service life of electric network terminal equipment, and electric network terminal equipment the most even can be made to burn;Too low line voltage is then likely to result in electric network terminal equipment cisco unity malfunction, therefore, needs a kind of detection device that can monitor electrical network in real time, to solve problems faced in industry in industry.
Traditional fault location is i.e. that the data utilizing ca bin collection are to analyze abort situation.Its method is to set up electric network model in advance in distribution main website, forms the topological structure of electrical network.When an error occurs, the data that ca bin is uploaded by distribution main website combine the topological structure of electrical network, use fault location algorithm to be calculated location of fault.
Traditional Fault Locating Method there is problems in that
One, owing to electrical network is huge, situation is complicated, greatly and the time is long to create suitable electric network model difficulty.
Two, there is no unified fault location algorithm, different electric network models, need to use the fault location algorithm adapted, each other can not be general.And generally amount of calculation is very big, expends the time long.
But, the position that major part fault occurs is single, and is not required to point-device location.Using feeder line end=end unit to gather very many electric network informations the most again, then utilize the fault location algorithm of complexity to calculate, hardware cost and time cost are the biggest.
Summary of the invention
Goal of the invention: the invention aims to solve deficiency of the prior art, it is provided that the electric power network fault detection system of a kind of low cost that can quickly and easily position single failure and fault detection method.
Technical scheme: a kind of electric power network fault detection system of the present invention, including electrical network, described electrical network connects testing circuit, multiple branched line it is provided with on described testing circuit, multiple current transformer it is respectively arranged with on described branched line, described current transformer is for gathering the current signal on electrical network, described detection connection is to fault judging circuit, photoelectric conversion unit and fault level judging unit and signal generator it is provided with on described fault judging circuit, described fault judging circuit connects alert process circuit, it is provided with alarm device on described alert process circuit.
Further, described alert process circuit is also associated with Surveillance center, and described Surveillance center is provided with wireless signal generator.
Further, described fault level judging unit is provided with fault comparison unit, in described fault comparison unit, is provided with multiple fault level standard.
A kind of electric power network fault detection method comprises the steps:
(1) arranging fault detector in electrical network, described fault detector is distributed on the circuit of electrical network, and described circuit includes basic routing line and at least one-level branched line, and every circuit is provided with at least one fault detector;
(2) tree shape model with fault detector as node is set up;In described tree shape model: the fault detector on same circuit is sequentially connected with, a rear fault detector is as the child node of previous fault detector;First fault detector on branched line as first fault detector on the child node of last fault detector on basic routing line, secondary one-level branched line as the child node of last fault detector on upper level branched line;
(3) fault detector it is identified and numbers;Fault detector number consecutively on same circuit, increases by 1 on the basis of the numbering of last fault detector on basic routing line of first fault detector on branched line;1 is increased on the basis of the numbering of last fault detector on upper level branched line of first fault detector on secondary one-level branched line;
(4) all paths of the traversal tree shape model with fault detector as node, judge that the quantity indicating the fault detector of fault on each paths is the most consistent with the numbering of the fault detector of numbering maximum, the most then using the mark of fault detector maximum for described numbering and numbering as the fault coordinate in this path;
(5) obtain the fault detector that the numbering component of fault coordinate is maximum, fault is positioned after which;
(6) in the case of detecting that described power distribution network breaks down, display screen shows the faulty line in described power distribution network, and obtains the terminal corresponding to described faulty line;And send fault cues message to described terminal;
(7) from default interconnected system, obtain the fault message of described faulty line, and in described display screen, show described fault message, wherein, described fault message at least includes: fault section, and described fault section is the railroad section at the place, position broken down in described faulty line.
Further, if the numbering indicating the quantity of the fault detector of fault and the fault detector of numbering maximum on a paths is inconsistent, then judge that whether the ratio indicating the numbering of the fault detector of the quantity of the fault detector of fault and numbering maximum is more than setting threshold value, if, then number the fault coordinate as this path using number maximum fault detector, and described fault coordinate is used for fault location;Otherwise it is assumed that there is not fault in this paths.
Further, the described threshold value that sets is as 60%.
Further, after the faulty line in showing described power distribution network, described method also includes: the running status of described faulty line is revised as exception;And send the work order handheld terminal that extremely described faulty line is corresponding, wherein, including at least repairing task in described work order.
Further, after sending the handheld terminal that work order is corresponding to described faulty line, described method also includes: set up described handheld terminal with the communication connection between command centre;Obtain directorial video information in described command centre by the picture pick-up device of described command centre, and described video information is sent to described handheld terminal by described communication connection.
Further, after sending the handheld terminal that work order is corresponding to described faulty line, described method also includes: receive described handheld terminal send complete instruction after, the running status of described faulty line is reverted to normally, wherein, complete instruction described in eliminate for the fault indicating described power distribution network to occur.
Further, whether operational factor based on the power distribution network received, detect described power distribution network and break down and include;Detect in described power distribution network and just on the circuit of distribution, whether foreign body occur, wherein, detect described just on the circuit of distribution, foreign body occurs in the case of, determine that described power distribution network breaks down;Or detect whether the just electric current on the circuit of distribution in described power distribution network undergos mutation, wherein, in the case of detecting that described electric current is undergone mutation, determine that described power distribution network breaks down.
Beneficial effect: compared with prior art, usefulness of the present invention is: be provided with testing circuit, fault judging circuit, alert process circuit and Surveillance center, testing circuit is provided with current transformer, the current information on electrical network is obtained by current transformer, and the information of fault-signal is determined by multiple judging units, thus determine that electrical network is the most faulty, and by alarm device and Surveillance center, information is released, it is thus possible to fix a breakdown with the fastest speed, present configuration is simple, easy to operate, cost is relatively low.
Fault detection method of the present invention uses operational factor based on the power distribution network received, and detects whether described power distribution network breaks down;In the case of detecting that described power distribution network breaks down, display screen shows the faulty line in described power distribution network;Obtain the terminal corresponding to described faulty line;Send the mode of fault cues message extremely described terminal, by in the case of detecting that power distribution network breaks down, the faulty line broken down is shown in display screen, and send fault cues message to terminal corresponding to faulty line, so that the holder of terminal such as repair personnel etc. can know rapidly power distribution network and occur in that fault, reach the purpose of rapid rush-repair faulty line, it is achieved thereby that improve the technique effect of distribution network failure maintenance efficiency, and then solve the technical problem that in prior art, distribution network failure maintenance efficiency is low.
Accompanying drawing explanation
Fig. 1 is the fault detection system structural representation of the present invention;
Fig. 2 is the fault detection method flow chart of one embodiment of the present of invention;
Fig. 3 is installation site and the schematic diagram of this body structure of the fault detector of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawings and detailed description of the invention describes the present invention:
According to a kind of power grid fault detection system shown in Fig. 1, being provided with electrical network 1, described electrical network 1 connects testing circuit 2, and described testing circuit 2 is provided with multiple branched line 201.
Further, described branched line 201 being respectively arranged with multiple current transformer 202, described current transformer 202 is for gathering the current signal on electrical network 1.
Yet further, described detection circuit 2 is connected to fault judging circuit 3, and described fault judging circuit 3 is provided with photoelectric conversion unit 301 and fault level judging unit 302 and signal generator 303.
Further, described fault judging circuit 3 connects alert process circuit 4, and described alert process circuit 4 is provided with alarm device 401.
Further, described alert process circuit 4 is also associated with Surveillance center 5, and described Surveillance center 5 is provided with wireless signal generator.
Further, described fault level judging unit 302 is provided with fault comparison unit 304, in described fault comparison unit 304, is provided with multiple fault level standard.
nullDuring use,It is provided with electrical network 1,Electrical network 1 is provided with testing circuit 2,Owing to testing circuit 2 is provided with multiple current transformer 202,From electrical network 1, the information of electric current is obtained by current transformer 202,The current signal of acquisition is passed to fault judging circuit 3,Current signal is first transmitted to photoelectric conversion unit 301,Current signal is converted into optical signal by photoelectric conversion unit 301,Then optical signal is passed to fault level judging unit 302,Owing to being provided with fault comparison unit 304 on fault level judging unit 302,So fault level judging unit 302 will be by the optical signal that receives compared with fault comparison unit 304,One is found to be consistent therewith or close numerical value,Thus obtain the fault level corresponding to optical signals,And fault level is sent to signal generator 303,Signal generator 303 judges whether to trigger alarm device 401 according to fault level,And by alarm device 401 to fault level sent Surveillance center 5,By the operator on duty in Surveillance center 5, fault is further analyzed,To judge whether this fault is further processed.
A kind of fault detection method as shown in Figure 2, comprises the steps:
(1) arranging fault detector in electrical network, described fault detector is distributed on the circuit of electrical network, and described circuit includes basic routing line and at least one-level branched line, and every circuit is provided with at least one fault detector;
(2) tree shape model with fault detector as node is set up;In described tree shape model: the fault detector on same circuit is sequentially connected with, a rear fault detector is as the child node of previous fault detector;First fault detector on branched line as first fault detector on the child node of last fault detector on basic routing line, secondary one-level branched line as the child node of last fault detector on upper level branched line;
(3) fault detector it is identified and numbers;Fault detector number consecutively on same circuit, increases by 1 on the basis of the numbering of last fault detector on basic routing line of first fault detector on branched line;1 is increased on the basis of the numbering of last fault detector on upper level branched line of first fault detector on secondary one-level branched line;
(4) all paths of the traversal tree shape model with fault detector as node, judge that the quantity indicating the fault detector of fault on each paths is the most consistent with the numbering of the fault detector of numbering maximum, the most then using the mark of fault detector maximum for described numbering and numbering as the fault coordinate in this path;
(5) obtain the fault detector that the numbering component of fault coordinate is maximum, fault is positioned after which;
(6) in the case of detecting that described power distribution network breaks down, display screen shows the faulty line in described power distribution network, and obtains the terminal corresponding to described faulty line;And send fault cues message to described terminal;
(7) from default interconnected system, obtain the fault message of described faulty line, and in described display screen, show described fault message, wherein, described fault message at least includes: fault section, and described fault section is the railroad section at the place, position broken down in described faulty line.
Further, if the numbering indicating the quantity of the fault detector of fault and the fault detector of numbering maximum on a paths is inconsistent, then judge that whether the ratio indicating the numbering of the fault detector of the quantity of the fault detector of fault and numbering maximum is more than setting threshold value, if, then number the fault coordinate as this path using number maximum fault detector, and described fault coordinate is used for fault location;Otherwise it is assumed that there is not fault in this paths.
Further, the described threshold value that sets is as 60%.
Further, after the faulty line in showing described power distribution network, described method also includes: the running status of described faulty line is revised as exception;And send the work order handheld terminal that extremely described faulty line is corresponding, wherein, including at least repairing task in described work order.
Further, after sending the handheld terminal that work order is corresponding to described faulty line, described method also includes: set up described handheld terminal with the communication connection between command centre;Obtain directorial video information in described command centre by the picture pick-up device of described command centre, and described video information is sent to described handheld terminal by described communication connection.
Further, after sending the handheld terminal that work order is corresponding to described faulty line, described method also includes: receive described handheld terminal send complete instruction after, the running status of described faulty line is reverted to normally, wherein, complete instruction described in eliminate for the fault indicating described power distribution network to occur.
Further, whether operational factor based on the power distribution network received, detect described power distribution network and break down and include;Detect in described power distribution network and just on the circuit of distribution, whether foreign body occur, wherein, detect described just on the circuit of distribution, foreign body occurs in the case of, determine that described power distribution network breaks down;Or detect whether the just electric current on the circuit of distribution in described power distribution network undergos mutation, wherein, in the case of detecting that described electric current is undergone mutation, determine that described power distribution network breaks down.
With reference to Fig. 3, fault detector may be installed the positions such as aerial line, electric power cable, bin, ring main unit and cable branch box, is used for indicating the fault such as grid short circuit or single-phase earthing.Fault detector mainly includes two parts: sensing part, including ground fault sensor and short trouble sensor;Host machine part, processes the signal of sensor, provides relevant instruction and alarm, simultaneously also by GPRS Communication module is sent to Surveillance center relevant warning message.When circuit is short-circuited or after earth fault, the equal board turning of all fault detectors from substation exit to trouble point or flash of light instruction.
The above, it it is only presently preferred embodiments of the present invention, not the present invention is made any pro forma restriction, although the present invention is disclosed above with preferred embodiment, but it is not limited to the present invention, any those skilled in the art, in the range of without departing from technical solution of the present invention, when the technology contents of available the disclosure above makes a little change or is modified to the Equivalent embodiments of equivalent variations, in every case it is the content without departing from technical solution of the present invention, any simple modification above example made according to the technical spirit of the present invention, equivalent variations and modification, all still fall within the range of technical solution of the present invention.

Claims (10)

1. an electric power network fault detection system, it is characterized in that: include electrical network (1), described electrical network (1) connects testing circuit (2), multiple branched line (201) it is provided with on described testing circuit (2), multiple current transformer (202) it is respectively arranged with on described branched line (201), described current transformer (202) is used for gathering the current signal on electrical network (1), described detection circuit (2) is connected to fault judging circuit (3), photoelectric conversion unit (301) and fault level judging unit (302) and signal generator (303) it is provided with on described fault judging circuit (3), described fault judging circuit (3) connects alert process circuit (4), it is provided with alarm device (401) on described alert process circuit (4).
A kind of electric power network fault detection system the most according to claim 1, it is characterized in that: described alert process circuit (4) is also associated with Surveillance center (5), described Surveillance center is provided with wireless signal generator on (5).
A kind of electric power network fault detection system the most according to claim 1, it is characterised in that: described fault level judging unit (302) being provided with fault comparison unit (304) on, described fault comparison unit (304) is inner is provided with multiple fault level standard.
4. an electric power network fault detection method, it is characterised in that: comprise the steps:
(1) arranging fault detector in electrical network, described fault detector is distributed on the circuit of electrical network, and described circuit includes basic routing line and at least one-level branched line, and every circuit is provided with at least one fault detector;
(2) tree shape model with fault detector as node is set up;In described tree shape model : the fault detector on same circuit is sequentially connected with, and a rear fault detector is as the child node of previous fault detector ;First fault detector on branched line is as first fault detector on the child node of last fault detector on basic routing line, secondary one-level branched line Child node as last fault detector on upper level branched line;
(3) fault detector it is identified and numbers;Fault detector number consecutively on same circuit, on branched line 1 is increased on the basis of the numbering of one fault detector last fault detector on basic routing line;On the basis of the numbering of last fault detector on upper level branched line of first fault detector on secondary one-level branched line Increase by 1;
(4) all paths of the traversal tree shape model with fault detector as node, judge that the quantity indicating the fault detector of fault on each paths is the most consistent with the numbering of the fault detector of numbering maximum, the most then using the mark of fault detector maximum for described numbering and numbering as the fault coordinate in this path;
(5) obtain the fault detector that the numbering component of fault coordinate is maximum, fault is positioned after which;
(6) in the case of detecting that described power distribution network breaks down, display screen shows the faulty line in described power distribution network, and obtains the terminal corresponding to described faulty line ;And send fault cues message to described terminal;
(7) obtaining the fault message of described faulty line from default interconnected system, and show described fault message in described display screen, wherein, described fault message at least includes: fault section, and described fault section is to break down in described faulty line The railroad section at place, position.
A kind of electric power network fault detection method the most according to claim 4, it is characterized in that: if indicating the quantity of the fault detector of fault and the numbering numbering maximum fault detector inconsistent on a paths, then judge that whether the ratio indicating the numbering of the fault detector of the quantity of the fault detector of fault and numbering maximum is more than setting threshold value, if, then number the fault coordinate as this path using number maximum fault detector, and described fault coordinate is used for fault location;Otherwise it is assumed that there is not fault in this paths.
A kind of electric power network fault detection method the most according to claim 5, it is characterised in that: the described threshold value that sets is as 60%.
A kind of electric power network fault detection method the most according to claim 4, it is characterised in that: after the faulty line in showing described power distribution network, described method also includes: the running status of described faulty line is revised as exception;And send the work order handheld terminal that extremely described faulty line is corresponding, wherein, including at least repairing task in described work order.
A kind of electric power network fault detection method the most according to claim 7, it is characterised in that: after sending the handheld terminal that work order is corresponding to described faulty line, described method also includes: set up described handheld terminal with the communication connection between command centre;Directorial video information in described command centre is obtained by the picture pick-up device of described command centre, and by described video Information is sent to described handheld terminal by described communication connection.
A kind of electric power network fault detection method the most according to claim 7, it is characterized in that: after sending the handheld terminal that work order is corresponding to described faulty line, described method also includes: receive described handheld terminal send complete instruction after, the running status of described faulty line is reverted to normally, wherein, complete instruction described in eliminate for the fault indicating described power distribution network to occur.
A kind of electric power network fault detection method the most according to claim 4, it is characterised in that: whether operational factor based on the power distribution network received, detect described power distribution network and break down and include;Detect in described power distribution network and just on the circuit of distribution, whether foreign body occur, wherein, detect described just on the circuit of distribution, foreign body occurs in the case of, determine that described power distribution network breaks down;Or detect whether the just electric current on the circuit of distribution in described power distribution network undergos mutation, wherein, detecting described electric current In the case of undergoing mutation, determine that described power distribution network breaks down.
CN201610408569.0A 2016-06-13 2016-06-13 Fault detection system and method for electric power grid Pending CN105891679A (en)

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CN106443362A (en) * 2016-11-16 2017-02-22 合肥普望电子有限责任公司 Power distribution network fault detection system
CN106546875A (en) * 2016-10-13 2017-03-29 华北科技学院 Power circuit alarm method
CN106646116A (en) * 2016-11-16 2017-05-10 合肥普望电子有限责任公司 Trouble shooting and locating method for power distribution network
CN108828288A (en) * 2018-04-10 2018-11-16 曲阜师范大学 A kind of intelligence Active Power Filter-APF referential current detection system
CN110532343A (en) * 2019-09-04 2019-12-03 广东电网有限责任公司 Comprehensive analysis of fault and information presentation system are pressed in a kind of power distribution network

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CN110532343A (en) * 2019-09-04 2019-12-03 广东电网有限责任公司 Comprehensive analysis of fault and information presentation system are pressed in a kind of power distribution network

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Application publication date: 20160824