CN109494703A - A kind of pro-active intervention type security personnel's arc extinguishing method based on compensation damping mode - Google Patents
A kind of pro-active intervention type security personnel's arc extinguishing method based on compensation damping mode Download PDFInfo
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- CN109494703A CN109494703A CN201811439566.9A CN201811439566A CN109494703A CN 109494703 A CN109494703 A CN 109494703A CN 201811439566 A CN201811439566 A CN 201811439566A CN 109494703 A CN109494703 A CN 109494703A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/08—Limitation or suppression of earth fault currents, e.g. Petersen coil
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/045—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage adapted to a particular application and not provided for elsewhere
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The present invention is a kind of pro-active intervention type security personnel's arc extinguishing method based on compensation damping mode, and this method is changed into neutral point ungrounded electric network through middle resistance eutral grounding power grid by compensation damping branch.By can quickly judge stable singlephase earth fault than detecting the method for compensating branch current compared with.Solves the earthing wire-selecting sensitivity of high resistance ground and the differentiation decision problem of nature of trouble by changing the method for compensating damping branch resistance.
Description
Technical field
The present invention is the quick judgement and process field of the nature of trouble of power distribution network single-phase earthing, is mainly used for power distribution network event
Barrier is mutually grounded pro-active intervention security personnel's arc-extinction device troubleshooting of extinguishing arc mode.
Background technique
Pro-active intervention security personnel arc-extinction device be based on neutral point ungrounded electric network, and neutral point ungrounded electric network due to
Various interior overvoltage are frequently given birth to, and especially ferromagnetic resonance for electromagnetic voltage transformer overvoltage frequently occurs, and in device action
The switching overvoltage generated in the process will affect device judgement as disturbance factor excitation ferromagnetic resonance for electromagnetic voltage transformer
And power grid security.When product verification test in 2017 certain products cause the multiple PT resonance in Luohe experiment station oneself through being proven.
So that certain products propose special requirement to the suppression measures of the voltage transformer of field experiment or substation in test, this
Power grid is actually required to go to meet the product for adapting to producer, rather than the product of producer goes to meet and adapts to power grid, this is not conform to
Suitable.In addition power network neutral point it is earth-free, through in grounding through arc and resistance grounded mode, isolated neutral
Interior overvoltage level is highest.If pro-active intervention type security personnel's arc-extinction device will be popularized in power grid, it is necessary to solve
The protection problem of interior overvoltage problem, especially ferro-resonance over-voltage.
Summary of the invention
In view of the above-mentioned problems, having invented a kind of pro-active intervention type security personnel's arc extinguishing method based on compensation damping mode, pass through
Grounding transformer draw neutral point of electric network, neutral point over the ground between access compensation damping branch, isolated neutral is changed
For resistance eutral grounding in neutral point warp.QF1 closes a floodgate when normal operation, and QF2 is disconnected, and device runs on middle resistance eutral grounding state, to matching
The interior overvoltage of power grid is damped.This internal overvoltage protection of mode, it is especially ferromagnetic to electromagnetic potential transformer is prevented
Resonance is very effective.Because damping resistance is in parallel with the exciting impedance of electromagnetic potential transformer in zero sequence circuit
, the resistance value of resistance is in 500--1000 Ω, and the exciting impedance of electromagnetic potential transformer is in tens of k Ω, poor several quantity
Grade, electromagnetic potential transformer are damped the basic resonance of restriction of resistance not, so compensation damp type pro-active intervention is protected
Peace arc-extinction device does not need to propose any requirement to the suppression measures of substation, will not all occur caused by electromagnetic potential transformer
Ferro-resonance over-voltage.
Since power grid is changed into middle resistance earthing also by isolated neutral mode by the presence of compensation damping resistance
Overvoltage in arc grounding over-voltage, switching overvoltage of power grid etc. can be effectively limited, ensure that the safety of power grid.
Pro-active intervention type security personnel's arc-extinction device based on compensation damping mode is by grounding transformer JDB, preposition breaker
QF0, threephase potential transformer TV1, neutral point voltage mutual inductor TV2, compensation damping branch fling-cut switch QF1, damping resistance R1With
R2, damping resistance switch switch QF2, compensation damping branch current mutual inductor TA1, failure phase earthing switch QFa、QFb、QFc, transfer
Earth current mutual inductor TA2It is constituted with apparatus control system and the zero sequence current mutual inductor for being mounted on each feeder line.Device is being matched
QF1 closes a floodgate when power grid operates normally, and QF2 is disconnected, and device runs on middle resistance eutral grounding state, carries out to the interior overvoltage of power distribution network
Damping.QF is disconnected when permanent singlephase earth fault occurs in power distribution network, and faulty line cannot be cut off for a long time1Exit compensation
Damping resistance.The QF in ground fault disappearance, device involution1It closes a floodgate, input compensation damps branch, runs on middle resistance eutral grounding shape
State damps the interior overvoltage of power distribution network.
When power distribution network in period Δ T1 neutral point displacement voltage UNStably reach definite value Δ UN>=δ, compensation damping branch
Electric current IBIncrement Delta IB≥Iη, the increment Delta I of the resistive component of any feeder line zero-sequence current0icosФ≥IβWhen, determine distribution
Stable singlephase earth fault has occurred in net, is otherwise unstable singlephase earth fault.δ is power network neutral point displacement voltage
Increment definite value, IηIncrement definite value, I for compensation damping branch currentβFor the resistive component of feeder line zero-sequence current increment definite value,
Δ T1 is to judge that the period of quiet earth, Ф are neutral point displacement voltage UNWith feeder line zero-sequence current I0iPhase angle.
After judging that stable singlephase earth fault has occurred in power distribution network, according to neutral point displacement voltage UNCarry out failure point
Area works as UN≥ULFor low-impedance earthed system failure, UN<ULFor high resistance earthing fault, ULFor low-impedance earthed system and high resistance ground neutral-point displacement
The cut off value of voltage.For low-impedance earthed system failure, selected by acquiring each feeder line zero-sequence current value with zero-sequence current than spoke method
The maximum feeder line of zero-sequence current is the route that single-phase earthing occurs.For high resistance earthing fault, especially unsymmetrical distribution net
High resistance earthing fault closes a floodgate QF2, and resistance in compensation damping branch routing is become low resistance, is provided to fault loop biggish
Current in resistance property is compensated, the increment Delta I of the resistive component of zero-sequence current in each feeder line is detectedmax0iThe maximum feeder line of cos Ф is to connect
Earth fault feeder line.
After judging that stable singlephase earth fault has occurred in power distribution network, ground fault is selected using partition type phase-selecting method
Phase, and failure phase earthing switch is closed a floodgate over the ground after selected earth fault line, fault current is shifted, fault point current potential is clamped down on,
Extinguishing arc processing is carried out to failure.
In failure phase earthing switch, closing time is relatively switched up to after Δ T2, disconnecting failure over the ground, to nature of trouble into
Row judgement, for low-impedance earthed system failure, by comparing neutral point displacement voltage UNWith the standard value U of fault recovery voltageHMethod
Judgement of failure is carried out, if UN<UH, it is transient fault, and failure has been restored, device involution；If UN≥UH, then it is permanent
Property failure；To high resistance earthing fault, the method by comparing ground fault feeder line zero-sequence current resistive component increment is judged,
If the increment Delta I of ground fault feeder line zero-sequence current resistive componentmax0icosФ<IH, then it is instantaneity ground fault, and failure
It has been restored that, device involution；If ground fault feeder line zero-sequence current resistive component increment Delta Imax0icosФ≥IH, then it is permanent
Ground fault.
Nature of trouble can also be carried out by comparing the variation of compensation branch current before and after failure to high resistance earthing fault to sentence
It is disconnected, if it is I that the compensation branch current before ground fault, which occurs,B0, the compensation branch current after ground fault occurs is IBG, disconnected
Open the electric current I that failure relatively switchs post-compensation branch currentB<fIB0, then it is instantaneity ground fault, and failure has been restored, dress
Set involution；If IB≥fIB0, then it is permanent fault, f is the current coefficient for compensating branch current, generally takes 1.1-1.3.
After judging that power distribution network connects permanent earth fault, tripping can be issued immediately, excision fault feeder is enabled to realize event
Barrier quickly isolates, and cuts off in permanent earth fault, device involution after fault characteristic signals disappear；As power distribution network does not allow to stand
Fault feeder is cut off, failure relatively should be switched immediately and closed a floodgate over the ground again, clamping down on fault point current potential is low potential, until
After troubleshooting, device involution after involution instruction is received.
Compensation damping branch R1 is middle resistance after connecting with R2, and the resistance value after series connection should meet damping power distribution network ferromagnetic resonance
The needs of overvoltage and switching overvoltage, generally 500-800 Ω, R2 are low resistance, generally 50-100 Ω, resistance it is through-flow
It is calculated when capacity is by metallic earthing, throughput time is mutually switched for the first time closing time over the ground by failure and calculated.
The present invention has an advantage that
1, the present invention is changed into isolated neutral mode through middle resistance earthing by compensation damping branch, and realization has
The interior overvoltage protection of effect, entirely prevented overvoltage in ferro-resonance over-voltage, switching overvoltage etc., the harm to power grid.
2, the present invention can quickly exclude non-singlephase earth fault by the detection that compensation damping branch compensates electric current, can be quick
Fault type is diagnosed, anti-error processing, can prevent from jeopardizing power grid safety accident.
3, the present invention compensates method of the detection of electric current compared with by compensation damping branch, can effectively solve high resistant and connect
Earthing wire-selecting sensitivity when the high resistance earthing fault on ground, especially unsymmetrical distribution net.
4, the present invention compensates method of the detection of electric current compared with by compensation damping branch, can effectively solve high resistant and connect
The Judgement of failure when high resistance earthing fault on ground, especially unsymmetrical distribution net.
Detailed description of the invention
Fig. 1 is formation picture of device, by grounding transformer JDB, preposition circuit breaker Q F0, threephase potential transformer TV1, neutral point
Voltage transformer TV2, compensation damping branch fling-cut switch QF1, damping resistance R1And R2, damping resistance switch switch QF2, compensation resistance
Buddhist nun's branch current mutual inductor TA1, failure phase earthing switch QFa、QFb、QFc, transfer earth current mutual inductor TA2It is controlled with device and is
The zero sequence current mutual inductor for uniting and being mounted on each feeder line is constituted.
Specific embodiment
Device QF1 when power distribution network operates normally closes a floodgate, and QF2 is disconnected, and device runs on middle resistance eutral grounding state, to distribution
The interior overvoltage of net is damped.Permanent singlephase earth fault occurs in power distribution network, and faulty line cannot be cut off for a long time
When disconnect QF1Compensation damping resistance is exited, the QF in ground fault disappearance, device involution1It closes a floodgate, input compensation damps branch, fortune
Row damps the interior overvoltage of power distribution network in middle resistance eutral grounding state.
When power distribution network in period Δ T1 neutral point displacement voltage UNStably reach definite value Δ UN>=δ, compensation damping branch
Electric current IBIncrement Delta IB≥Iη, the increment Delta I of the resistive component of any feeder line zero-sequence current0icosФ≥IβWhen, determine distribution
Stable singlephase earth fault has occurred in net, is otherwise unstable singlephase earth fault；δ is power network neutral point displacement voltage
Increment definite value, IηIncrement definite value, I for compensation damping branch currentβFor the resistive component of feeder line zero-sequence current increment definite value,
Δ T1 is to judge that the period of quiet earth, Ф are neutral point displacement voltage UNWith feeder line zero-sequence current I0iPhase angle.
After judging that stable singlephase earth fault has occurred in power distribution network, according to neutral point displacement voltage UNCarry out failure point
Area works as UN≥ULFor low-impedance earthed system failure, UN<ULFor high resistance earthing fault, ULFor low-impedance earthed system and high resistance ground neutral-point displacement
The cut off value of voltage；For low-impedance earthed system failure, selected by acquiring each feeder line zero-sequence current value with zero-sequence current than spoke method
The maximum feeder line of zero-sequence current is the route that single-phase earthing occurs；For high resistance earthing fault, especially unsymmetrical distribution net
High resistance earthing fault closes a floodgate QF2, and resistance in compensation damping branch routing is become low resistance, is provided to fault loop biggish
Current in resistance property is compensated, the increment Delta I of the resistive component of zero-sequence current in each feeder line is detectedmax0iThe maximum feeder line of cos Ф is to connect
Earth fault feeder line.
After judging that stable singlephase earth fault has occurred in power distribution network, ground fault is selected using partition type phase-selecting method
Phase, and failure phase earthing switch is closed a floodgate over the ground after selected earth fault line, fault current is shifted, fault point current potential is clamped down on,
Extinguishing arc processing is carried out to failure.
In failure phase earthing switch, closing time is relatively switched up to after Δ T2, disconnecting failure over the ground, to nature of trouble into
Row judgement, for low-impedance earthed system failure, by comparing neutral point displacement voltage UNWith the standard value U of fault recovery voltageHMethod
Judgement of failure is carried out, if UN<UH, it is transient fault, and failure has been restored, device involution；If UN≥UH, then it is permanent
Property failure；To high resistance earthing fault, the method by comparing ground fault feeder line zero-sequence current resistive component increment is judged,
If the increment Delta I of ground fault feeder line zero-sequence current resistive componentmax0icosФ<IH, then it is instantaneity ground fault, and failure
It has been restored that, device involution；If ground fault feeder line zero-sequence current resistive component increment Delta Imax0icosФ≥IH, then it is permanent
Ground fault.
Nature of trouble can also be carried out by comparing the variation of compensation branch current before and after failure to high resistance earthing fault to sentence
It is disconnected, if it is I that the compensation branch current before ground fault, which occurs,B0, the compensation branch current after ground fault occurs is IBG, disconnected
Open the electric current I that failure relatively switchs post-compensation branch currentB<fIB0, then it is instantaneity ground fault, and failure has been restored, dress
Set involution；If IB≥fIB0, then it is permanent fault, f is the current coefficient for compensating branch current, generally takes 1.1-1.3.
After judging that power distribution network connects permanent earth fault, tripping can be issued immediately, excision fault feeder is enabled to realize event
Barrier quickly isolates, and cuts off in permanent earth fault, device involution after fault characteristic signals disappear；As power distribution network does not allow to stand
Fault feeder is cut off, failure relatively should be switched immediately and closed a floodgate over the ground again, clamping down on fault point current potential is low potential, until
After troubleshooting, device involution after involution instruction is received.
Compensation damping branch R1 is middle resistance after connecting with R2, and the resistance value after series connection should meet damping power distribution network ferromagnetic resonance
The needs of overvoltage and switching overvoltage, generally 500-800 Ω, R2 are low resistance, generally 50-100 Ω, resistance it is through-flow
It is calculated when capacity is by metallic earthing, throughput time is mutually switched for the first time closing time over the ground by failure and calculated.
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 (2)
- The arc extinguishing method 1. a kind of pro-active intervention type based on compensation damping mode is ensured public security, by grounding transformer JDB, preposition breaker QF0, threephase potential transformer TV1, neutral point voltage mutual inductor TV2, compensation damping branch fling-cut switch QF1, damping resistance R1With R2, damping resistance switch switch QF2, compensation damping branch current mutual inductor TA1, failure phase earthing switch QFa、QFb、QFc, transfer Earth current mutual inductor TA2It is constituted with apparatus control system and the zero sequence current mutual inductor for being mounted on each feeder line, feature exists In: device QF1 when power distribution network operates normally closes a floodgate, and QF2 is disconnected, and device runs on middle resistance eutral grounding state, to power distribution network Interior overvoltage is damped；When permanent singlephase earth fault occurs in power distribution network, and faulty line cannot be cut off for a long time, break Open QF1Exit compensation damping resistance；The QF in ground fault disappearance, device involution1It closes a floodgate, input compensation damps branch, runs on Middle resistance eutral grounding state damps the interior overvoltage of power distribution network；When power distribution network in period Δ T1 neutral point displacement voltage UNStably reach definite value Δ UN>=δ, compensation damping branch current IBIncrement Delta IB≥Iη, the increment Delta I of the resistive component of any feeder line zero-sequence current0icosФ≥IβWhen, determine power distribution network hair Stable singlephase earth fault has been given birth to, has been otherwise unstable singlephase earth fault；δ is the increment of power network neutral point displacement voltage Definite value, IηIncrement definite value, I for compensation damping branch currentβIncrement definite value, Δ T1 for the resistive component of feeder line zero-sequence current To judge that the period of quiet earth, Ф are neutral point displacement voltage UNWith feeder line zero-sequence current I0iPhase angle；After judging that stable singlephase earth fault has occurred in power distribution network, according to neutral point displacement voltage UNFailure subregion is carried out, when UN≥ULFor low-impedance earthed system failure, UN<ULFor high resistance earthing fault, ULFor low-impedance earthed system and high resistance ground neutral point displacement voltage Cut off value；For low-impedance earthed system failure, by acquiring each feeder line zero-sequence current value, with zero-sequence current than spoke method, zero sequence electricity is selected Flowing maximum feeder line is the route that single-phase earthing occurs；The high resistant of high resistance earthing fault, especially unsymmetrical distribution net is connect Earth fault closes a floodgate QF2, and resistance in compensation damping branch routing is become low resistance, provides biggish compensation resistance to fault loop Property electric current, detects the increment Delta I of the resistive component of zero-sequence current in each feeder linemax0iThe maximum feeder line of cos Ф is ground fault Feeder line；After judging that stable singlephase earth fault has occurred in power distribution network, ground fault phase is selected using partition type phase-selecting method, And failure phase earthing switch is closed a floodgate over the ground after selected earth fault line, fault current is shifted, fault point current potential is clamped down on, to event Barrier carries out extinguishing arc processing；After closing time reaches Δ T2 over the ground in failure phase earthing switch, disconnects failure and relatively switch, nature of trouble is sentenced It is disconnected, for low-impedance earthed system failure, by comparing neutral point displacement voltage UNWith the standard value U of fault recovery voltageHMethod carry out Judgement of failure, if UN<UH, it is transient fault, and failure has been restored, device involution；If UN≥UH, then it is permanent event Barrier；To high resistance earthing fault, the method by comparing ground fault feeder line zero-sequence current resistive component increment is judged, if connecing The increment Delta I of earth fault feeder line zero-sequence current resistive componentmax0icosФ<IH, then it is instantaneity ground fault, and failure is extensive It is multiple, device involution；If ground fault feeder line zero-sequence current resistive component increment Delta Imax0icosФ≥IH, then it is permanent earth Failure；Judgement of failure can also be carried out by comparing the variation of compensation branch current before and after failure to high resistance earthing fault, if Compensation branch current before ground fault occurs is IB0, the compensation branch current after ground fault occurs is IBG, disconnect failure Relatively switch the electric current I of post-compensation branch currentB<fIB0, then it is instantaneity ground fault, and failure has been restored, device is multiple Return；If IB≥fIB0, then it is permanent fault, f is the current coefficient for compensating branch current, generally takes 1.1-1.3；After judging that power distribution network connects permanent earth fault, tripping can be issued immediately, excision fault feeder is enabled to realize failure It quickly isolates, is cut off in permanent earth fault, device involution after fault characteristic signals disappear；As power distribution network does not allow to cut immediately Except fault feeder, failure relatively should be switched immediately and closed a floodgate over the ground again, clamping down on fault point current potential is low potential, until failure After processing, device involution after involution instruction is received.
- The arc extinguishing method 2. a kind of pro-active intervention type based on compensation damping mode according to claim 1 is ensured public security, feature Be: it is middle resistance that compensation, which damps after branch R1 connects with R2, and the resistance value after series connection should meet damping power distribution network ferromagnetic resonance mistake The needs of voltage and switching overvoltage, the discharge capacity of resistance press metallicity Grounding calculation, and throughput time is by failure mutually switch the Once closing time calculates over the ground.
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| CN110888018A (en) * | 2019-11-11 | 2020-03-17 | 国网河南省电力公司漯河供电公司 | Asymmetric power grid high-resistance grounding line selection method based on resistive current comparison method |
| CN110896214A (en) * | 2019-12-02 | 2020-03-20 | 国网河南省电力公司电力科学研究院 | Phase selection method of active intervention type arc suppression device |
| CN112054487A (en) * | 2019-06-05 | 2020-12-08 | 李景禄 | Single-phase earth fault judgment and processing method for direct-distribution new energy power plant |
| CN112103934A (en) * | 2020-08-19 | 2020-12-18 | 许继电气股份有限公司 | Resistor switching device and method in low-current line selection parallel connection |
| CN112332397A (en) * | 2019-08-01 | 2021-02-05 | 李景禄 | Parallel ground fault processing method for arc suppression coil and active intervention arc suppression device |
| CN112332380A (en) * | 2019-07-19 | 2021-02-05 | 李景禄 | Intelligent judgment and processing method for multiple earth faults of power distribution network |
| CN112666421A (en) * | 2019-10-16 | 2021-04-16 | 李景禄 | Fault area isolation method based on compensation damping type active intervention arc suppression device |
| CN113036744A (en) * | 2019-12-09 | 2021-06-25 | 李景禄 | Fault judgment and processing method for dynamic grounding device of power distribution network |
| CN113054638A (en) * | 2019-12-26 | 2021-06-29 | 李景禄 | Method for processing dynamic parallel ground fault of arc suppression coil and active intervention arc suppression device |
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| CN112054487A (en) * | 2019-06-05 | 2020-12-08 | 李景禄 | Single-phase earth fault judgment and processing method for direct-distribution new energy power plant |
| CN112332380B (en) * | 2019-07-19 | 2022-05-24 | 李景禄 | Intelligent judgment and processing method for multiple earth faults of power distribution network |
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| CN113036744A (en) * | 2019-12-09 | 2021-06-25 | 李景禄 | Fault judgment and processing method for dynamic grounding device of power distribution network |
| CN113054638A (en) * | 2019-12-26 | 2021-06-29 | 李景禄 | Method for processing dynamic parallel ground fault of arc suppression coil and active intervention arc suppression device |
| CN112103934A (en) * | 2020-08-19 | 2020-12-18 | 许继电气股份有限公司 | Resistor switching device and method in low-current line selection parallel connection |
| CN113253060A (en) * | 2021-06-24 | 2021-08-13 | 国网河南省电力公司电力科学研究院 | Fault diagnosis method and system considering action influence of active intervention type arc suppression device |
| CN113253060B (en) * | 2021-06-24 | 2022-04-26 | 国网河南省电力公司电力科学研究院 | Fault diagnosis method and system considering action influence of active intervention type arc suppression device |
| CN114465210A (en) * | 2022-01-28 | 2022-05-10 | 河海大学 | Power distribution network fault arc extinction and feeder line protection device and method based on line voltage series modulation damping grounding |
| 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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