CN108683157B - Bus grounding intelligent judgment method for transferring grounding processing device - Google Patents

Bus grounding intelligent judgment method for transferring grounding processing device Download PDF

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Publication number
CN108683157B
CN108683157B CN201810491957.9A CN201810491957A CN108683157B CN 108683157 B CN108683157 B CN 108683157B CN 201810491957 A CN201810491957 A CN 201810491957A CN 108683157 B CN108683157 B CN 108683157B
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fault
grounding
resistance
phase
bus
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CN108683157A (en
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李政洋
李景禄
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H1/00—Details of emergency protective circuit arrangements
    • H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means

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  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Locating Faults (AREA)

Abstract

The invention relates to a bus grounding intelligent judgment method for a transfer grounding processing device, which is used for judging whether a single-phase grounding fault occurs according to a neutral point voltage UNThe earth fault is divided into a low-resistance earth fault area and a metal earth fault area, and whether the bus single-phase earth fault or the line single-phase earth fault of the substation is judged in different fault areas according to the variable quantity of zero-sequence current before and after transfer.

Description

Bus grounding intelligent judgment method for transferring grounding processing device
Technical Field
The invention belongs to the field of single-phase earth fault processing of a power distribution network, and is mainly used for rapidly judging and selecting faults of a single-phase earth fault of a bus of a substation or a single-phase earth fault of a feeder.
Background
When the ground fault processing device is used for processing the single-phase ground fault, the bus of the substation sometimes has the single-phase ground fault, the single-phase ground fault needs to be judged to occur on the bus or a feeder line connected to the bus, and the fault isolation processing can be accurately carried out only by judging whether the single-phase ground fault occurs on the bus of the substation or the feeder line. When a single-phase earth fault occurs, the change of the shift voltage of the bus and the feeder which are connected together at the neutral point of the fault characteristic is the same, so that the fault area is difficult to be quickly judged according to the single-phase earth fault characteristic, and if the fault area cannot be accurately judged, the fault isolation processing cannot be carried out, so that the fault area is quickly judged and the fault processing in time is very necessary when the single-phase earth fault occurs.
Disclosure of Invention
According to neutral point voltage UNDividing the earth fault into a medium resistance earth fault area and a metal earth fault area, when UG2>UN≥UG1Then, for the middle-resistance fault area, firstly, the feeder line K with the maximum zero-sequence current in each feeder line is found through a zero-sequence current amplitude comparison methodnWhen the zero sequence current of the feeder line is In1Then selecting the earth fault phase, switching on the earth switch of the fault phase for a time T1Then measuring the feeder line KnZero sequence current I ofn2If the medium resistance fault region meets delta In=In1-In2>δ1Judging that the line is in single-phase grounding, and the grounding line is the feeder KnIf Δ In=In1-In2≯δ1When the single-phase earth fault occurs to the bus of the substation, when the U is in the fault stateN>UG2When it is a metal ground fault area, if Δ In=In1-In2>δ2Then the circuit is judged to be single-phase grounding, and the grounding circuit is the feedLine KnIf Δ In=In1-In2≯δ2If so, generating single-phase earth fault for the bus of the substation; delta1For the allowable value of zero-sequence current change, delta, in the medium-resistance fault region2The zero sequence current change allowable value is a metal grounding fault area; u shapeG2The threshold value is a medium resistance fault and metal grounding fault threshold value; u shapeG1Is a medium resistance fault and high resistance grounding critical value.
δ1For the allowable value of zero-sequence current change, delta, in the medium-resistance fault region2The allowable value of the zero sequence current change of the metal grounding fault area is related to the grounding resistance of a fault point and the grounding resistance of a substation transfer grounding processing device.
UG2The threshold value of medium resistance fault and metal ground fault is the neutral point displacement voltage as UN>UG2Time, metal ground fault, UG1For medium resistance fault and high resistance grounding threshold, when UN< UG1A high resistance ground fault is present.
The invention has the following advantages:
1. the method solves the technical problem of accurate judgment of the bus single-phase earth fault and the feeder single-phase earth, is convenient for accurately isolating the fault, and prevents the feeder from being cut by mistake in the bus single-phase earth fault.
2. The method is simple and quick, and is convenient for the rapid judgment and processing of the fault by comparing the change of the zero sequence current before and after the fault transfer.
Detailed Description
According to neutral point voltage UNDividing the earth fault into a medium resistance earth fault area and a metal earth fault area, when UG2>UN≥UG1Then, for the middle-resistance fault area, firstly, the feeder line K with the maximum zero-sequence current in each feeder line is found through a zero-sequence current amplitude comparison methodnWhen the zero sequence current of the feeder line is In1Then selecting the earth fault phase, switching on the earth switch of the fault phase for a time T1Then measuring the feeder line KnZero sequence current I ofn2If the medium resistance fault region meets delta In=In1-In2>δ1Judging that the line is in single-phase grounding, and the grounding line is the feeder KnIf Δ In=In1-In2≯δ1When the single-phase earth fault occurs to the bus of the substation, when the U is in the fault stateN>UG2When it is a metal ground fault area, if Δ In=In1-In2>δ2Judging that the line is in single-phase grounding, and the grounding line is the feeder KnIf Δ In=In1-In2≯δ2If so, generating single-phase earth fault for the bus of the substation; delta1For the allowable value of zero-sequence current change, delta, in the medium-resistance fault region2The zero sequence current change allowable value is a metal grounding fault area; u shapeG2The threshold value is a medium resistance fault and metal grounding fault threshold value; u shapeG1Is a medium resistance fault and high resistance grounding critical value.
δ1For the allowable value of zero-sequence current change, delta, in the medium-resistance fault region1For the allowable value of zero-sequence current change, delta, in the medium-resistance fault region2The allowable value of the zero sequence current change of the metal grounding fault area is related to the grounding resistance of a fault point and the grounding resistance of a substation transfer grounding processing device.
UG2The threshold value of medium resistance fault and metal ground fault is the neutral point displacement voltage as UN>UG2Time, metal ground fault, UG1For medium resistance fault and high resistance grounding threshold, when UN< UG1A high resistance ground fault is present.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that several modifications and adaptations to those skilled in the art without departing from the principles of the present invention should also be considered within the scope of the present invention.

Claims (3)

1. The utility model provides a bus grounding intelligence judgement method for shifting ground treatment device which characterized in that: according to neutral point voltage UNDividing earth faults into medium-impedance connectionsGround fault area and metal ground fault area, when UG2>UN≥UG1Then, for the middle-resistance fault area, firstly, the feeder line K with the maximum zero-sequence current in each feeder line is found through a zero-sequence current amplitude comparison methodnWhen the zero sequence current of the feeder line is In1Then selecting the earth fault phase, switching on the earth switch of the fault phase for a time T1Then measuring the feeder line KnZero sequence current I ofn2If the medium resistance fault region meets delta In=In1-In2>δ1Judging that the line is in single-phase grounding, and the grounding line is the feeder KnIf Δ In=In1-In2≯δ1When the single-phase earth fault occurs to the bus of the substation, when the U is in the fault stateN>UG2When it is a metal ground fault area, if Δ In=In1-In2>δ2Judging that the line is in single-phase grounding, and the grounding line is the feeder KnIf Δ In=In1-In2≯δ2If so, generating single-phase earth fault for the bus of the substation; delta1For the allowable value of zero-sequence current change, delta, in the medium-resistance fault region2The zero sequence current change allowable value is a metal grounding fault area; u shapeG2The threshold value is a medium resistance fault and metal grounding fault threshold value; u shapeG1Is a medium resistance fault and high resistance grounding critical value.
2. The bus grounding intelligent judgment method for the transfer grounding processing device according to claim 1, characterized in that: delta1And delta2Both are related to the ground resistance of the fault point and the ground resistance of the substation transfer ground processing device.
3. The bus grounding intelligent judgment method for the transfer grounding processing device according to claim 1, characterized in that: when the neutral point displacement voltage is UN>UG2When it is a metal ground fault, when UN< UG1A high resistance ground fault is present.
CN201810491957.9A 2018-05-22 2018-05-22 Bus grounding intelligent judgment method for transferring grounding processing device Active CN108683157B (en)

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CN201810491957.9A CN108683157B (en) 2018-05-22 2018-05-22 Bus grounding intelligent judgment method for transferring grounding processing device

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CN108683157B true CN108683157B (en) 2020-01-03

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113253044B (en) * 2020-07-10 2022-08-16 李景禄 Intelligent judgment and processing method for single-phase earth fault in small-resistance earthing mode

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105119257A (en) * 2015-07-25 2015-12-02 李景禄 Dynamic processing method for single-phase transition resistor grounding fault of power distribution network
CN106505537A (en) * 2016-12-08 2017-03-15 李景禄 A kind of power network neutral point dynamic electric resistor earthing mode and earthing wire-selecting method
CN107144766A (en) * 2017-06-30 2017-09-08 李景禄 A kind of fast diagnosis method for the fault type that earthing or grounding means is shifted for power distribution network
CN107276050A (en) * 2017-06-29 2017-10-20 李景禄 A kind of Modes for Neutral partition type fault handling method

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2680017A1 (en) * 2012-06-28 2014-01-01 ABB Technology AG A method of early detection of feeder lines with a high-ohm ground fault in compensated power networks

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105119257A (en) * 2015-07-25 2015-12-02 李景禄 Dynamic processing method for single-phase transition resistor grounding fault of power distribution network
CN106505537A (en) * 2016-12-08 2017-03-15 李景禄 A kind of power network neutral point dynamic electric resistor earthing mode and earthing wire-selecting method
CN107276050A (en) * 2017-06-29 2017-10-20 李景禄 A kind of Modes for Neutral partition type fault handling method
CN107144766A (en) * 2017-06-30 2017-09-08 李景禄 A kind of fast diagnosis method for the fault type that earthing or grounding means is shifted for power distribution network

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