CN108683157A - A kind of busbar grounding intelligent decision method for shifting grounding device - Google Patents
A kind of busbar grounding intelligent decision method for shifting grounding device Download PDFInfo
- Publication number
- CN108683157A CN108683157A CN201810491957.9A CN201810491957A CN108683157A CN 108683157 A CN108683157 A CN 108683157A CN 201810491957 A CN201810491957 A CN 201810491957A CN 108683157 A CN108683157 A CN 108683157A
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- China
- Prior art keywords
- ground
- zero
- feeder line
- earth fault
- faulty section
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Classifications
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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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- Emergency Protection Circuit Devices (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Locating Faults (AREA)
Abstract
The present invention is a kind of busbar grounding intelligent decision method for shifting grounding device, when singlephase earth fault occurs, according to neutral point voltage UNEarth fault is divided into low-impedance earthed system faulty section and metallic ground faulty section, the variable quantity of zero-sequence current judges substation busbars singlephase earth fault or line single phase grounding failure before and after different faulty sections is according to transfer.
Description
Technical field
The present invention is one-phase earthing failure in electric distribution network process field, is mainly used for substation busbars and singlephase earth fault occurs
Or single-phase earthing occurs for feeder line therefore failure quickly judges and route selection processing.
Background technology
When being handled singlephase earth fault using earth fault processing unit, since substation busbars can also be sent out sometimes
Raw singlephase earth fault needs to judge that singlephase earth fault is happened at the single-phase of the feeder line generation connect on busbar either busbar
Earth fault need to judge that singlephase earth fault is happened at substation bus bar or feeder line, could carry out accurately carrying out failure
Isolation processing.Because when singlephase earth fault occurs, the busbar being linked together is with feeder line in fault signature neutral-point displacement
The variation of voltage is all identical, it is difficult to the quick judgement of fault zone is carried out according to Fault feature of single phase earthing, it such as cannot be accurate
True judges fault zone, cannot carry out Fault Isolation processing, thus quickly judges when singlephase earth fault occurs
It is out of order region and to take timely troubleshooting be very necessary.
Invention content
A kind of busbar grounding intelligent decision method for shifting grounding device, feature have been invented in view of the above problems
It is：According to neutral point voltage UNEarth fault is divided into low-impedance earthed system faulty section and metallic ground faulty section, works as UG2>UN≥UG1
When, it is middle resistance faulty section, it is maximum feeder line K that zero-sequence current in each feeder line is found than width method by zero-sequence current firstn, at this time should
The zero-sequence current of feeder line is In1, earth fault phase is then selected, the earthing switch of failure phase is closed a floodgate over the ground, through time T1Afterwards again
Measure feeder line KnZero-sequence current In2If meeting Δ I in middle resistance faulty sectionn=In1-In2≥δ1Then it is judged as that list has occurred in circuit
It is mutually grounded, ground path is feeder line KnIf Δ In=In1-In2≯δ1, then singlephase earth fault has occurred for substation busbars;
Work as UN>UG2When, it is metallic ground faulty section, if Δ In=In1-In2≥δ2Then it is judged as that single-phase earthing has occurred in circuit, is grounded
Road is feeder line KnIf Δ In=In1-In2≯δ2, then singlephase earth fault has occurred for substation busbars.
δ1Change permissible value, δ for middle resistance faulty section zero-sequence current2Change permissible value for metallic ground faulty section zero-sequence current,
It is related with the ground resistance of fault point and electric substation's transfer ground resistance of grounding device.
UG2For middle resistance failure and metallic ground fault critical, when neutral point displacement voltage works as UN>UG2When, it is metallic ground
Failure; UG1For middle resistance failure and high resistance ground critical value, work as UN< UG1When be high resistance earthing fault.
Present invention tool has the advantage that：
1, the invention solves the accurate judgement technical barrier of busbar singlephase earth fault and feeder line single-phase earthing, convenient for accurate
Isolated fault is carried out, prevents from accidentally cutting feeder line in busbar singlephase earth fault.
2, the invention is by comparing the zero-sequence current variation front and back in failure transfer, method is simple, it is quick, convenient for failure
Property speed judgement processing.
Specific implementation mode
When voltage transformer detects electric substation residual voltage UNWhen abnormal, according to neutral point voltage UNEarth fault point
For low-impedance earthed system faulty section and metallic ground faulty section, work as UG2>UN≥UG1When, it is middle resistance faulty section, passes through zero-sequence current first
It is maximum feeder line K that zero-sequence current in each feeder line is found than width methodn, the zero-sequence current of the feeder line is I at this timen1, then select ground connection
Failure phase over the ground closes a floodgate the earthing switch of failure phase, through time T1Measure feeder line K again afterwardsnZero-sequence current In2, in middle resistance
If faulty section meets Δ In=In1-In2≥δ1Then it is judged as that single-phase earthing has occurred in circuit, ground path is feeder line KnIf Δ In
=In1-In2≯δ1, then singlephase earth fault has occurred for substation busbars;Work as UN>UG2When, it is metallic ground faulty section, if Δ
In=In1-In2≥δ2Then it is judged as that single-phase earthing has occurred in circuit, ground path is feeder line KnIf Δ In=In1-In2≯δ2, then
Singlephase earth fault has occurred for substation busbars.
δ1Change permissible value, δ for middle resistance faulty section zero-sequence current1Change permissible value, δ for middle resistance faulty section zero-sequence current2For
Metallic ground faulty section zero-sequence current changes permissible value, and grounding device is shifted with the ground resistance of fault point and electric substation
Ground resistance is related.
UG2For middle resistance failure and metallic ground fault critical, when neutral point displacement voltage works as UN>UG2When, it is metallic ground
Failure; UG1For middle resistance failure and high resistance ground critical value, work as UN< UG1When be high resistance earthing 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 the guarantor of the present invention
Protect range.
Claims (3)
1. a kind of busbar grounding intelligent decision method for shifting grounding device, it is characterised in that：According to neutral point voltage UN
Earth fault is divided into low-impedance earthed system faulty section and metallic ground faulty section, works as UG2>UN≥UG1When, it is middle resistance faulty section, first
It is maximum feeder line K that than width method zero-sequence current in each feeder line is found by zero-sequence currentn, the zero-sequence current of the feeder line is I at this timen1,
Then earth fault phase is selected, the earthing switch of failure phase is closed a floodgate over the ground, through time T1Measure feeder line K again afterwardsnZero sequence electricity
Flow In2If meeting Δ I in middle resistance faulty sectionn=In1-In2≥δ1Then it is judged as that single-phase earthing has occurred in circuit, ground path is
Feeder line KnIf Δ In=In1-In2≯δ1, then singlephase earth fault has occurred for substation busbars;Work as UN>UG2When, it is connect for metal
Earth fault area, if Δ In=In1-In2≥δ2Then it is judged as that single-phase earthing has occurred in circuit, ground path is feeder line KnIf Δ In=
In1-In2≯δ2, then singlephase earth fault has occurred for substation busbars.
2. a kind of busbar grounding intelligent decision method for shifting grounding device according to claim 1, feature
It is：δ1Change permissible value, δ for middle resistance faulty section zero-sequence current2Change permissible value for metallic ground faulty section zero-sequence current, with
The ground resistance that the ground resistance of fault point shifts grounding device with electric substation is related.
3. a kind of busbar grounding intelligent decision method for shifting grounding device according to claim 1, feature
It is：UG2For middle resistance failure and metallic ground fault critical, when neutral point displacement voltage works as UN>UG2When, it is metallic ground event
Barrier; UG1For middle resistance failure and high resistance ground critical value, work as UN< UG1When be high resistance earthing fault.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810491957.9A CN108683157B (en) | 2018-05-22 | 2018-05-22 | Bus grounding intelligent judgment method for transferring grounding processing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810491957.9A CN108683157B (en) | 2018-05-22 | 2018-05-22 | Bus grounding intelligent judgment method for transferring grounding processing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108683157A true CN108683157A (en) | 2018-10-19 |
| CN108683157B CN108683157B (en) | 2020-01-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810491957.9A Active CN108683157B (en) | 2018-05-22 | 2018-05-22 | Bus grounding intelligent judgment method for transferring grounding processing device |
Country Status (1)
| Country | Link |
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| CN (1) | CN108683157B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113253044A (en) * | 2020-07-10 | 2021-08-13 | 李景禄 | Intelligent judgment and processing method for single-phase earth fault in small-resistance earthing mode |
Citations (5)
| 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 |
| 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 |
-
2018
- 2018-05-22 CN CN201810491957.9A patent/CN108683157B/en active Active
Patent Citations (5)
| 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 |
| 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 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113253044A (en) * | 2020-07-10 | 2021-08-13 | 李景禄 | Intelligent judgment and processing method for single-phase earth fault in small-resistance earthing mode |
| 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 |
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| Publication number | Publication date |
|---|---|
| CN108683157B (en) | 2020-01-03 |
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