CN107271855B - A kind of quick judgement and processing method for one-phase earthing failure in electric distribution network region - Google Patents

A kind of quick judgement and processing method for one-phase earthing failure in electric distribution network region Download PDF

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Publication number
CN107271855B
CN107271855B CN201710637239.3A CN201710637239A CN107271855B CN 107271855 B CN107271855 B CN 107271855B CN 201710637239 A CN201710637239 A CN 201710637239A CN 107271855 B CN107271855 B CN 107271855B
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China
Prior art keywords
singlephase earth
earth fault
sequence current
electric substation
feeder line
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CN201710637239.3A
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Chinese (zh)
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CN107271855A (en
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李政洋
李景禄
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李景禄
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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

Abstract

The present invention is a kind of quick judgement and processing method for one-phase earthing failure in electric distribution network region, by the inlet wire zero sequence current mutual inductor, each feeder line zero sequence current mutual inductor acquisition zero-sequence current that are mounted on each regional power grid, troubleshooting is executed by being mounted on each regional power grid ground fault processing unit M, when singlephase earth fault occurs, by inlet wire zero sequence current mutual inductor TAj0Measure Ij0, by each feeder line zero sequence current mutual inductor TA10、TA20、…TAn0Measure I10、I20…In0If:Singlephase earth fault outside the area Ze Wei, ground fault processing unit decide whether to handle singlephase earth fault outside area according to different Grids;If, singlephase earth fault in the area Ze Wei, ground fault processing unit selects singlephase earth fault route than spoke method by zero-sequence current and carries out troubleshooting by comparing the size of feeder line zero-sequence current each in area at this time.

Description

A kind of quick judgement and processing method for one-phase earthing failure in electric distribution network region

Technical field

The present invention is one-phase earthing failure in electric distribution network process field, is mainly used for power distribution network and event when singlephase earth fault occurs Hinder the quick judgement and processing in region.

Background technique

When being handled using ground fault processing unit singlephase earth fault, due to all different mothers of same power transformation Line, it is sometimes desirable to which denominator operation is run sometimes for mother is closed.When closing female operation, singlephase earth fault such as occurs, needs to judge Singlephase earth fault occurs which section bus just can be carried out accurate singlephase earth fault processing at;Some substation's outlet also bands There is switchyard, when singlephase earth fault occurs, need to judge that singlephase earth fault is to occur in substation feeder or switching The feeder line stood just can be carried out accurate singlephase earth fault processing;Hand-in-hand interconnection is also had between different substations, When singlephase earth fault occurs, it need to judge that singlephase earth fault has occurred in the feeder line of which substation, it is accurate just to can be carried out Singlephase earth fault processing.And when singlephase earth fault occurs, distribution network its fault signature being linked together is neutral Point displacement voltage variation be all it is identical, be difficult according to Fault feature of single phase earthing carry out fault zone quick judgement, such as It can not accurately judge fault zone, troubleshooting cannot be carried out, thus quickly sentence when singlephase earth fault occurs Disconnected be out of order and takes timely troubleshooting to be very important at region.

Summary of the invention

A kind of quick judgement and processing method for one-phase earthing failure in electric distribution network region has been invented in view of the above problems, Inlet wire zero sequence current mutual inductor, each feeder line zero sequence current mutual inductor and ground fault by being mounted on each regional distribution network are handled The system that device M is constituted is implemented, when singlephase earth fault occurs, by inlet wire zero sequence current mutual inductor TAj0Measure Ij0, by each Feeder line zero sequence current mutual inductor TA10、TA20、…TAn0Measure I10、I20…In0If: Ij0=I10+I20+…+In0It is single-phase outside the area Ze Wei Ground fault, ground fault processing unit decide whether according to different distribution web areas to outside area at singlephase earth fault Reason;If Ij0≠I10+I20+…+In0, singlephase earth fault in the area Ze Wei, ground fault processing unit is by comparing each in area at this time The size of feeder line zero-sequence current selects singlephase earth fault route than width method by zero-sequence current and carries out troubleshooting.

When the different buses that the region of power distribution network is same electric substation close female operation, it is mainly used for the list to different buses The judgement of phase ground fault and processing, inlet wire zero sequence current mutual inductor is bus connection switch side zero sequence current mutual inductor, single-phase in area to connect Earth fault refers to the Feeder on a certain bus, and the ground fault processing unit being mounted on the bus is removed to the mother The singlephase earth fault that each feeder line occurs in line carries out handling the outer single-phase earthing that should be able to also other bus feeders occur Failure is handled, to adapt to needs when electric substation's difference bus closes female operation.

When the region of power distribution network is the switchyard that electric substation is connected with outgoing line side, it is mainly used for judging singlephase earth fault It is the feeder line occurred in switchyard, or other feeder lines in electric substation occurs, inlet wire zero sequence current mutual inductor is switchyard Interconnector zero sequence current mutual inductor, singlephase earth fault refers to the singlephase earth fault that feeder line occurs in switchyard in area, should The ground fault processing unit of switchyard need to only be handled singlephase earth fault in switchyard, be not required to the list of processing electric substation Phase ground fault.

When the region of power distribution network is that different electric substations is interconnected by route hand in hand, it is mainly used for judging single-phase earthing Failure is occurred in which electric substation, and inlet wire zero sequence current mutual inductor is that the interconnector inlet wire zero-sequence current of the electric substation is mutual Sensor, singlephase earth fault refers to the singlephase earth fault that feeder line occurs in the electric substation in area, at the ground fault of the electric substation Reason device need to only be handled singlephase earth fault in the electric substation, be not required to the outer electric substation's singlephase earth fault for the treatment of region.

The present invention has an advantage that

1, the invention solves interrelated by comparing the correlation of inlet wire zero-sequence current and each feeder line zero-sequence current The judgment technology problem of one-phase earthing failure in electric distribution network generation area keeps the judgement of interconnected network singlephase earth fault convenient, fast It is prompt, accurate.

2, when the different buses that the invention solves same electric substation close female operation, which mother singlephase earth fault occurs Line problem, the technical problem of the judgement and processing of singlephase earth fault when solving electric substation's more bus parallel runnings.

3, the invention solves electric substation and outgoing line side is connected switchyard when singlephase earth fault occurs, and fault zone is sentenced Disconnected and processing technique problem.

4, when the invention solves different electric substations by the interconnection of route hand in hand, which seat singlephase earth fault occurs at The judgement and processing problem of electric substation.

Detailed description of the invention

Fig. 1 is power distribution network subregion and the circuit structure diagram that ground fault is handled.

Specific embodiment

By the inlet wire zero sequence current mutual inductor, each feeder line zero sequence current mutual inductor and ground connection that are mounted on each regional distribution network The system that fault treating apparatus M is constituted is implemented.When singlephase earth fault occurs, by inlet wire zero sequence current mutual inductor TAj0Measurement Ij0, by each feeder line zero sequence current mutual inductor TA10、TA20、…TAn0Measure I10、I20…In0If: Ij0=I10+I20+…+In0Then it is Singlephase earth fault outside area, ground fault processing unit decide whether according to different Grids to singlephase earth fault outside area It is handled;If Ij0≠I10+I20+…+In0, singlephase earth fault in the area Ze Wei, ground fault processing unit is by comparing at this time The size of each feeder line zero-sequence current in area, by zero-sequence current than width method select the maximum feeder line of zero-sequence current be single-phase earthing therefore Hinder route.

When the different buses that the region of power distribution network is same electric substation close female operation, it is mainly used for the list to different buses The judgement of phase ground fault and processing, inlet wire zero sequence current mutual inductor is bus connection switch side zero sequence current mutual inductor, single-phase in area to connect Earth fault refers to the Feeder on a certain bus, and the ground fault processing unit being mounted on the bus is removed to the mother The singlephase earth fault that each feeder line occurs in line carries out handling the outer single-phase earthing that should be able to also other bus feeders occur Failure is handled, to adapt to needs when female operation is closed by electric substation.When the ground fault processing unit being mounted on certain bus Each feeder line zero-sequence current I on this bus is detected when singlephase earth fault occurs10、I20…InIf: Ij0=I10+I20+…+In0Then Singlephase earth fault has occurred for feeder line on other bus;If Ij0≠I10+I20+…+In0, then connect for feeder line on this bus is single-phase Earth fault, ground fault processing unit compares width by zero-sequence current by the size of each bus feeder line zero-sequence current of detection at this time Method selects singlephase earth fault route and carries out troubleshooting.

When the region of power distribution network is the switchyard that electric substation is connected with outgoing line side, it is mainly used for judging singlephase earth fault It is the feeder line occurred in switchyard, or other feeder lines in electric substation occurs, inlet wire zero sequence current mutual inductor is switchyard Interconnector zero sequence current mutual inductor, singlephase earth fault refers to the singlephase earth fault that feeder line occurs in switchyard in area.Work as peace Mounted in switchyard ground fault processing unit singlephase earth fault occur when each feeder line zero-sequence current I in detection switch station10、 I20…InIf: Ij0=I10+I20+…+In0Singlephase earth fault then has occurred for station is outer;If Ij0≠I10+I20+…+In0, then for Singlephase earth fault in standing.The ground fault processing unit of the switchyard need to only be handled singlephase earth fault in standing, no Need the outer singlephase earth fault for the treatment of stations.

When the region of power distribution network is that different electric substations is interconnected by route hand in hand, it is mainly used for judging single-phase earthing Failure is occurred in which electric substation, and inlet wire zero sequence current mutual inductor is the interconnector zero sequence current mutual inductance of the electric substation Device, singlephase earth fault refers to the singlephase earth fault that feeder line occurs in the electric substation in area.When the ground connection for being mounted on the electric substation Fault treating apparatus detects each feeder line zero-sequence current I of electric substation when singlephase earth fault occurs10、I20…InIf: Ij0=I10+ I20+…+In0Then for singlephase earth fault has occurred outside;If Ij0≠I10+I20+…+In0, then it is single-phase earthing in the electric substation Failure.The ground fault processing unit of the electric substation need to only be handled singlephase earth fault in institute, and it is outer single to be not required to processing institute Phase ground fault.

The above is only a preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-mentioned implementation Example, all technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It should be pointed out that for the art Those of ordinary skill for, several improvements and modifications without departing from the principles of the present invention also should be regarded as guarantor of the invention Protect range.

Claims (4)

1. a kind of quick judgement and processing method for one-phase earthing failure in electric distribution network region, by being mounted on each region distribution The system that the inlet wire zero sequence current mutual inductor of net, each feeder line zero sequence current mutual inductor and ground fault processing unit M are constituted is implemented, It is characterized by: when singlephase earth fault occurs for power distribution network, by inlet wire zero sequence current mutual inductor TAj0Measure Ij0, by each feeder line Zero sequence current mutual inductor TA10、TA20、…TAn0Measure I10、I20…In0;If: Ij0=I10+I20+…+In0Single-phase earthing outside the area Ze Wei Failure, ground fault processing unit decide whether to handle singlephase earth fault outside area according to different distribution web areas; If Ij0≠I10+I20+…+In0, singlephase earth fault in the area Ze Wei, ground fault processing unit is respectively presented by comparing in area at this time The size of line zero-sequence current selects singlephase earth fault route than width method by zero-sequence current and carries out troubleshooting;
When the different buses that the region of power distribution network is same electric substation close female operation, it is mainly used for connecing the single-phase of different buses Earth fault judgement and processing, inlet wire zero sequence current mutual inductor are bus connection switch side zero sequence current mutual inductor, single-phase earthing event in area Barrier refers to the Feeder on a certain bus, and the ground fault processing unit being mounted on the bus is removed in the bus The singlephase earth fault that each feeder line occurs carries out handling the outer singlephase earth fault that should be able to also other bus feeders occur It is handled, to adapt to needs when electric substation's difference bus closes female operation;
When the region of power distribution network is the switchyard that electric substation is connected with outgoing line side, it is mainly used for judging that singlephase earth fault is hair The raw feeder line in switchyard, or other feeder lines in electric substation occur, inlet wire zero sequence current mutual inductor is the connection of switchyard Winding thread road zero sequence current mutual inductor, singlephase earth fault refers to the singlephase earth fault that feeder line occurs in switchyard, the switch in area The ground fault processing unit stood need to only be handled singlephase earth fault in switchyard, be not required to processing the single-phase of electric substation and connect Earth fault;
When the region of power distribution network is that different electric substations is interconnected by route hand in hand, it is mainly used for judging singlephase earth fault It is to occur in which electric substation, inlet wire zero sequence current mutual inductor is the interconnector inlet wire zero sequence current mutual inductance of the electric substation Device, singlephase earth fault refers to the singlephase earth fault that feeder line occurs in the electric substation, the ground fault processing of the electric substation in area Device need to only be handled singlephase earth fault in the electric substation, be not required to the outer electric substation's singlephase earth fault for the treatment of region.
2. a kind of quick judgement and processing method for one-phase earthing failure in electric distribution network region according to claim 1, It is characterized by: being mainly used for when the different buses that the region of power distribution network is same electric substation close female operation to different buses Singlephase earth fault judgement and processing, inlet wire zero sequence current mutual inductor is bus connection switch side zero sequence current mutual inductor, single in area Phase ground fault refers to the Feeder on a certain bus, be mounted on ground fault processing unit on the bus except pair The singlephase earth fault that each feeder line occurs in the bus handle outside should be able to also be to the single-phase of other bus feeders generation Ground fault is handled, to adapt to needs when female operation is closed by electric substation, when the ground fault processing being mounted on certain bus Device detects each feeder line zero-sequence current I on this bus when singlephase earth fault occurs10、I20…InIf: Ij0=I10+I20+…+ In0Singlephase earth fault then has occurred for feeder line on other bus;If Ij0≠I10+I20+…+In0, then it is feeder line list on this bus Phase ground fault, ground fault processing unit carries out troubleshooting by detecting the size of each bus feeder line zero-sequence current at this time.
3. a kind of quick judgement and processing method for one-phase earthing failure in electric distribution network region according to claim 1, It is characterized by: being mainly used for judging single-phase earthing when the region of power distribution network is the switchyard that electric substation is connected with outgoing line side Failure is the feeder line occurred in switchyard, or other feeder lines in electric substation occur, and inlet wire zero sequence current mutual inductor is switch The interconnector zero sequence current mutual inductor stood, singlephase earth fault refers to the singlephase earth fault that feeder line occurs in switchyard in area, Each feeder line zero-sequence current in detection switch station when being mounted on the ground fault processing unit of switchyard in singlephase earth fault generation I10、I20…InIf: Ij0=I10+I20+…+In0Singlephase earth fault then has occurred for station is outer;If Ij0≠I10+I20+…+In0, then For interior singlephase earth fault of standing, the ground fault processing unit of the switchyard need to only be handled singlephase earth fault in standing, It is not required to the outer singlephase earth fault for the treatment of stations.
4. a kind of quick judgement and processing method for one-phase earthing failure in electric distribution network region according to claim 1, It is characterized by: being mainly used for judging single-phase when the region of power distribution network is that different electric substations is interconnected by route hand in hand Ground fault is occurred in which electric substation, and inlet wire zero sequence current mutual inductor is that the interconnector zero-sequence current of the electric substation is mutual Sensor, singlephase earth fault refers to the singlephase earth fault that feeder line occurs in the electric substation in area, is mounted on the ground connection of the electric substation Fault treating apparatus detects each feeder line zero-sequence current I of electric substation when singlephase earth fault occurs10、I20…InIf: Ij0=I10+ I20+…+In0Then for singlephase earth fault has occurred outside;If Ij0≠I10+I20+…+In0, then it is single-phase earthing in the electric substation Failure, the ground fault processing unit of the electric substation need to only be handled singlephase earth fault in institute, and it is outer single to be not required to processing institute Phase ground fault.
CN201710637239.3A 2017-07-31 2017-07-31 A kind of quick judgement and processing method for one-phase earthing failure in electric distribution network region CN107271855B (en)

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CN1529178A (en) * 2003-10-09 2004-09-15 武汉大学 Electric-power system transmitting-line fault diagnosis and phase selecting method
CN101551432B (en) * 2009-05-07 2011-06-15 江苏省电力公司常州供电公司 Power distribution network fault positioning method
CN102064537B (en) * 2010-12-10 2013-10-16 天津天大求实电力新技术股份有限公司 Method for judging and processing single-phase earth faults by using electronic mutual inductor
CN103208788B (en) * 2013-03-08 2015-11-04 李景禄 Intelligent Dynamic power network neutral point earthing method and the complete sets of equipment
CN103219721A (en) * 2013-04-19 2013-07-24 国家电网公司 Automatic integrated processing method for single-phase earth fault
CN103529357A (en) * 2013-08-02 2014-01-22 吉林省电力有限公司长春供电公司 Method for determining section of single-phase ground fault of 10kV power distribution system
CN203688722U (en) * 2014-01-24 2014-07-02 泉州维盾电气有限公司 Single-phase grounding fault processing device for small-current grounding system
CN103760465B (en) * 2014-01-24 2016-06-08 泉州维盾电气有限公司 Single-phase grounded malfunction in grounded system of low current discriminating direction and processing method
CN104535883B (en) * 2014-12-29 2017-04-26 北京四方继保自动化股份有限公司 Small current grounding fault line selection method based on full-system grounding fault information
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CN106370975B (en) * 2016-08-18 2018-11-02 国家电网公司 A kind of pinpoint method of electrical power distribution automatization system single-phase earthing section

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