CN107144766B - A kind of fast diagnosis method of the fault type for power distribution network transfer earthing or grounding means - Google Patents
A kind of fast diagnosis method of the fault type for power distribution network transfer earthing or grounding means Download PDFInfo
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- CN107144766B CN107144766B CN201710526458.4A CN201710526458A CN107144766B CN 107144766 B CN107144766 B CN 107144766B CN 201710526458 A CN201710526458 A CN 201710526458A CN 107144766 B CN107144766 B CN 107144766B
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000003745 diagnosis Methods 0.000 title claims abstract description 15
- 238000012546 transfer Methods 0.000 title claims abstract description 13
- 230000007935 neutral effect Effects 0.000 claims abstract description 31
- 238000006073 displacement reaction Methods 0.000 claims abstract description 23
- 230000008030 elimination Effects 0.000 claims abstract description 14
- 238000003379 elimination reaction Methods 0.000 claims abstract description 14
- 230000005350 ferromagnetic resonance Effects 0.000 claims abstract description 9
- 238000001514 detection method Methods 0.000 claims description 3
- 230000000977 initiatory effect Effects 0.000 claims description 3
- 230000006641 stabilisation Effects 0.000 claims description 2
- 238000011105 stabilization Methods 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 4
- 238000013016 damping Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 230000005347 demagnetization Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
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- Mathematical Physics (AREA)
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- Emergency Protection Circuit Devices (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Locating Faults (AREA)
Abstract
A kind of fast diagnosis method of the fault type for power distribution network transfer earthing or grounding means, detects neutral point displacement voltage by power network neutral point voltage transformer TVAnd its stablize increment, and handleWith neutral point of electric network displacement voltage fault increment standard valueIt compares, whenWhen, first close zero sequence compensation branch switch QF1, increment is stablized by the electric current of zero sequence compensation branch current mutual inductor TA measurement zero sequence compensation branch, with zero sequence compensation branch current increment standard valueIt compares, such as:It is then one-phase earthing failure in electric distribution network；If:, then it is not singlephase earth fault.Closing zero sequence compensation branch switch QF1Afterwards, if:, Huo ZheWhen, close harmonic elimination branch switch QF2Afterwards,Then failure is power grid ferromagnetic resonance failure.Closing zero sequence compensation branch switch QF1With harmonic elimination circuit switching QF2Afterwards, such as:Then judge that Zero sequence parameter unbalanced fault occurs for power grid.
Description
Technical field
The present invention is the fast diagnosis method and process field of the fault type of power distribution network single-phase earthing, is mainly used for distribution
Net transfer grounding device is when handling distribution network failure to the quick judgement of fault type.
Background technique
There are many types for the failure of power distribution network, but mainly have singlephase earth fault, ferromagnetic resonance failure and asymmetric broken string
Failure, these failures occur Shi Douhui and power network neutral point displacement voltage are caused to increase, and many power distribution network grounding devices
When handling distribution network failure, main according to being exactly that power network neutral point displacement voltage increases, especially power distribution network transfer is connect
Ground processing unit is to close the switch over the ground of failure phase in electric substation to handle with the method for transfer fault current that power distribution network is single-phase connects
Earth fault, and if ferromagnetic resonance has occurred in such as original power grid or asymmetric broken string occurs for power grid to fault type error in judgement
It has been directed at the raising of power network neutral point displacement voltage, and power distribution network transfer grounding device is mistakenly considered that single-phase earthing event has occurred
Barrier, and the switch over the ground of a certain phase is closed a floodgate over the ground, it will result in processing fault, also will cause accident when serious, thus having must
The fast diagnosis method for finding a kind of distribution network failure type, quick diagnosis is carried out when power distribution network breaks down, then fastly
Speed is accurately handled.
Summary of the invention
In view of the above-mentioned problems, a kind of fast diagnosis method of the fault type for power distribution network transfer earthing or grounding means, distribution
The fast diagnosis method of the fault type of net transfer earthing or grounding means draws neutral point of electric network by the grounding transformer JB of device, in
Property point voltage transformer TV tracking measurement neutral point of electric network displacement voltage, by switch QF1Switching zero sequence compensation branch, zero sequence compensation
Branch resistance R1Overvoltage in current limliting and damping power grid is carried out, zero sequence compensation branch current mutual inductor TA detects zero-sequence current, by
Switch QF2Harmonic elimination branch switching harmonic elimination nonlinear resistance R2.Neutral-point displacement is detected in power network neutral point voltage transformer TV
Voltage UNAnd its it generates and stablizes increment Delta UNWhen, Δ UNWith neutral point of electric network displacement voltage fault increment standard value Δ UQIt compares
Compared with as Δ UN≥ΔUQWhen, first close zero sequence compensation branch switch QF1, zero sequence is measured by zero sequence compensation branch current mutual inductor TA
The electric current for compensating branch stablizes increment Delta I0, with zero sequence compensation branch current increment standard value Δ IηIt compares, such as: Δ I0>ΔIη
It is then one-phase earthing failure in electric distribution network；If: Δ I0≤ΔIη, then it is not singlephase earth fault；Closing zero sequence compensation branch switch
QF1Afterwards, if: Δ UN<ΔUQ, or in Δ UN≥ΔUQWhen, close harmonic elimination branch switch QF2Afterwards, Δ UN<ΔUQThen failure be for
Power grid ferromagnetic resonance failure；Closing zero sequence compensation branch switch QF1With harmonic elimination branch switch QF2Afterwards, such as: Δ UN≥ΔUQThen
Judge that Zero sequence parameter unbalanced fault occurs for power grid.
Neutral point displacement voltage increment value Δ UNThe stabilization increment of neutral point of electric network displacement voltage when being operation of power networks；Failure
Increment standard value Δ UQIt is the standard increment value of neutral point of electric network displacement voltage when judging grid collapses, at different failures
Fault initiating requirement when managing device and require specific setting according to it, but generally meeting high resistance ground.
The electric current of zero sequence compensation branch stablizes increment Delta I0Be zero sequence compensation branch electric current stablize incremental value, power grid just
Often when operation, Ge closes zero sequence compensation branch switch QF in changes of operating modes1,By current transformer TA detection branch electric current
I01A reference value is made in storage, and zero sequence compensation branch switch QF is closed when judging failure1,Detecting zero sequence compensation circuit I02, zero
The electric current that sequence compensates branch stablizes increment: Δ I0=I02-I01；ΔIηIt is the zero-sequence current judged when single-phase earthing occurs for power distribution network
Increment standard value, Δ IηEarth current when high resistance ground can occur according to power grid is set.
The present invention has an advantage that
1, the invention solves the problems, such as the quick diagnosis of distribution network failure type, can fast and accurately judge power distribution network list
Zero sequence parameter unbalanced fault caused by phase ground fault, ferromagnetic resonance failure and power grid break.
2, using the fast diagnosis method of one-phase earthing failure in electric distribution network type, power distribution network can be judged within the shortest time
Fault type helps correctly to handle different distribution network failures in power distribution network transfer earthing or grounding means, prevents error action of device from making
At accident, Ge makes fault spread jeopardize equipment and personal safety.
Detailed description of the invention
Fig. 1 is that power distribution network shifts structure chart of the earthing or grounding means for the quick diagnosis of distribution network failure type.
Specific embodiment
The fast diagnosis method that power distribution network shifts the fault type of earthing or grounding means draws electricity by the grounding transformer JB of device
Net neutral point；By neutral point voltage mutual inductor TV tracking measurement neutral point of electric network displacement voltage；By switch QF1Switching zero sequence compensation
Branch；Zero sequence compensation branch resistance R1Carry out overvoltage in current limliting and damping power grid；Zero sequence compensation branch current mutual inductor TA inspection
Survey zero-sequence current；By switch QF2Harmonic elimination branch switching harmonic elimination nonlinear resistance R2.It is examined in power network neutral point voltage transformer TV
Measure neutral point displacement voltage UNWhen stable variation occurs, by the increment Delta U of neutral point displacement voltageNWith the event being set in advance
Barrier starting standard value Δ UQIt compares, as Δ UN≥ΔUQWhen, first close zero sequence compensation branch switch QF1, by zero sequence compensation branch
The electric current that current transformer TA measures zero sequence compensation circuit stablizes increment Delta I0, with zero sequence compensation branch current increment standard value Δ
IηIt compares, single-phase earthing such as occurs, the faulty line and zero sequence compensation branch of ground connection constitute circuit, and zero-sequence current is inevitable at this time
Increase to Δ I0>ΔIη, it was demonstrated that singlephase earth fault occurs for power distribution network；If: Δ I0≤ΔIη, then illustrate no and zero sequence compensation
Branch constitutes circuit, is not singlephase earth fault.At this time because closing zero sequence compensation branch switch QF1A damping resistance R is put into1,
Damping action can be generated to power grid ferromagnetic resonance failure, ferromagnetic resonance failure can disappear under normal circumstances, Δ UN<ΔUQIf failure
It does not disappear, Δ UN≥ΔUQWhen, then close harmonic elimination branch switch QF2Put into nonlinear resistance R2Pressure demagnetization is carried out, if ferromagnetic
Resonance failure, then Δ UN<ΔUQ, failure vanishes；If closing zero sequence compensation branch switch QF1With harmonic elimination circuit switching QF2Afterwards,
If failure does not disappear still, Δ UN≥ΔUQThen judge that Zero sequence parameter unbalanced fault occurs for power grid, should alarm at this time.
Neutral point displacement voltage increment value Δ UNThe increment of neutral point of electric network displacement voltage when being operation of power networks, by neutral point
Reality tracking measurement when voltage transformer TV.Fault increment standard value Δ UQIt is that neutral point of electric network is displaced when judging grid collapses
The standard increment value of voltage, different fault treating apparatus can require specific setting according to it, but generally meet single-phase high resistant
Fault initiating requirement when ground connection.
ΔI0It is the stable incremental value of electric current in zero sequence compensation circuit, device is when power grid operates normally or the method for operation is sent out
Zero sequence compensation branch switch QF is closed when changing1,By current transformer TA detection branch electric current I01Benchmark reference point is made in storage,
In the increment value Δ U of neutral point displacement voltageNReach fault increment starting standard value Δ UQWhen close zero sequence compensation branch switch again
QF1,By current transformer TA measure loop electric current I02, Δ I0=I02-I01.Zero-sequence current increment standard value Δ IηIt can be according to power grid
Earth current when high resistance ground occurs is set.
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 (3)
1. a kind of fast diagnosis method of the fault type for power distribution network transfer earthing or grounding means, by grounding transformer JB, neutrality
Point voltage transformer TV, zero sequence compensation branch switch QF1, zero sequence compensation branch resistance R1, zero sequence compensation branch current mutual inductor
TA, harmonic elimination branch switch QF2, harmonic elimination nonlinear resistance R2Composition, it is characterised in that: in power network neutral point voltage transformer TV
Detect neutral point displacement voltage UNStable increment Delta U occursNWhen, Δ UNWith neutral point of electric network displacement voltage fault increment mark
Quasi- value Δ UQIt compares, as Δ UN≥ΔUQWhen, close zero sequence compensation branch switch QF1, by zero sequence compensation branch current mutual inductor
The electric current that TA measures zero sequence compensation branch stablizes increment Delta I0, with zero sequence compensation branch current increment standard value Δ IηIt compares,
Such as: Δ I0>ΔIηIt is then one-phase earthing failure in electric distribution network, if: Δ I0≤ΔIη, then it is not singlephase earth fault；Closing zero sequence
Compensate branch switch QF1Afterwards, if: Δ UN<ΔUQ, or in Δ UN≥ΔUQWhen, close harmonic elimination branch switch QF2Afterwards, Δ UN<Δ
UQThen failure is power grid ferromagnetic resonance failure；Closing zero sequence compensation branch switch QF1With harmonic elimination circuit switching QF2Afterwards, such as: Δ
UN≥ΔUQThen judge that Zero sequence parameter unbalanced fault occurs for power grid.
2. a kind of fast diagnosis method of fault type for power distribution network transfer earthing or grounding means according to claim 1,
It is characterized by: neutral point displacement voltage increment value Δ UNThe stabilization increment of neutral point of electric network displacement voltage when being operation of power networks；
Fault increment standard value Δ UQIt is the standard value of neutral point of electric network displacement voltage when judging grid collapses, at different failures
Device is managed according to requiring specifically to set, to meet fault initiating requirement when high resistance ground.
3. a kind of fast diagnosis method of fault type for power distribution network transfer earthing or grounding means according to claim 1,
It is characterized by: Δ I0Be zero sequence compensation circuit electric current stablize incremental value, device power grid operate normally when or the method for operation
Zero sequence compensation branch switch QF is closed when changing1,By current transformer TA detection branch electric current I01Benchmark reference is made in storage
Value, in the increment value Δ U of neutral point displacement voltageNReach fault increment starting standard value Δ UQWhen close zero sequence compensation branch again
Switch QF1,By current transformer TA measure loop electric current I02, Δ I0=I02-I01；ΔIηIt is zero-sequence current increment standard value, according to
Earth current when high resistance ground occurs for power grid is set.
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108683157B (en) * | 2018-05-22 | 2020-01-03 | 李景禄 | Bus grounding intelligent judgment method for transferring grounding processing device |
| CN110146780B (en) * | 2019-04-24 | 2021-06-08 | 国网江苏省电力有限公司电力科学研究院 | Ferromagnetic resonance distinguishing method for neutral point ungrounded flexible power distribution network system |
| CN112763838B (en) * | 2019-11-06 | 2022-08-30 | 李景禄 | Power distribution network multivariable characteristic parameter dynamic association fault judgment method |
| CN117833183A (en) * | 2022-04-24 | 2024-04-05 | 李景禄 | Intelligent overvoltage protection method for power distribution network and neutral point ungrounded transformer |
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