CN107526005A - A kind of Sudden Changing Rate of singlephase earth fault processing unit starts method - Google Patents
A kind of Sudden Changing Rate of singlephase earth fault processing unit starts method Download PDFInfo
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- CN107526005A CN107526005A CN201710641356.7A CN201710641356A CN107526005A CN 107526005 A CN107526005 A CN 107526005A CN 201710641356 A CN201710641356 A CN 201710641356A CN 107526005 A CN107526005 A CN 107526005A
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- earth fault
- processing unit
- fault processing
- neutral point
- changing rate
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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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- 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
Abstract
A kind of Sudden Changing Rate of singlephase earth fault processing unit starts method, by detecting neutral point of electric network displacement voltage in real timeThe maximum zero-sequence current i with each feeder linemax0If the Sudden Changing Rate of neutral point voltage meets in period Δ T：Δun≥ΔuNL, while the stable Sudden Changing Rate of the zero-sequence current of any feeder line maximum meets：imax0≥i0B+Δiδ, then it is determined as power network there occurs single-phase earthing, now earth fault processing unit enters fault initiating, and singlephase earth fault is handled；If in the periodThe interior Sudden Changing Rate with neutral point voltage meets：ΔuN≥ΔuNL, but the stable Sudden Changing Rate i of the zero-sequence current of feeder line maximummax0∠i0B+∠Δiδ, then it is determined as being neutral point displacement voltage caused by electrical network parameter changeChange, earth fault processing unit do not start；If the power network neutral point voltage jump amount Δ u in period Δ TNNot lasting reaches Δ uN≥ΔuNL, or feeder line maximum zero sequence current imax0Not lasting reaches imax0≥i0B+Δiδ, then being determined as power network, Ge is intermittent leaks over the ground there occurs unstable disturbance ground connection, and now earth fault processing unit does not enter fault initiating.
Description
Technical field
The present invention is one-phase earthing failure in electric distribution network process field, when being mainly used in power distribution network generation single-phase earthing, ground connection
The determination of the fault initiating method of fault treating apparatus.
Background technology
Need to set when singlephase earth fault occurs for power distribution network, during the carry out troubleshooting of different earth fault processing units
One enters fault initiating value, at present typically using the absolute value of neutral point of electric network displacement voltage as singlephase earth fault
Fault initiating value, for the power network using arc suppression coil compensation, typically using neutral point displacement voltage（
For phase voltage）Make fault initiating magnitude of voltage during earth fault processing, but because the parameter of power network is different, power network asymmetric system
NumberAlso it is different.When code regulation centering point is earth-free, dissymmetry coefficientSpan be 0-5%.Mended through arc suppression coil
The power network repaid, neutral point displacement voltage：（V is compensation power network tuning-off degree, and d is the damping of power network
Rate）, it is known that power network dissymmetry coefficientWith compensation power network tuning-off degree v centering point displacement voltagesInfluence it is very big, such as only in
Property point displacement voltageAs the initiation value of earth fault, then it is likely to cause earth fault processing unit malfunction.Because through extinguishing arc
The upper limit of Coil Compensation neutral point of electric network displacement voltage, but such asWhen, just haveFailure dead band can not
Startup separator processing.Neutral point ungrounded electric network, dissymmetry coefficientSpan be 0-5%, if setting electric network fault
Start voltage, then for dissymmetry coefficientFor 0 when, then have 5% failure dead band.And for person electric shock or conductor cord disconnection
Caused by high resistance earthing fault, be substantially all in this scope, that is to say, that as use neutral point of electric network displacement voltage absolute value
As the fault initiating value of singlephase earth fault, the high resistance earthing fault for caused by person electric shock or conductor cord disconnection is substantially all
Do not reach the fault initiating value of earth fault processing unit and cannot handle.
The content of the invention
The fault initiating of earth fault processing unit, has invented one during in order to solve the problems, such as power distribution network generation single earth fault
The Sudden Changing Rate of kind singlephase earth fault processing unit starts method, in power network normal operation by installed in power network neutral point voltage
Transformer detects power network neutral point displacement voltage in real time, by the zero sequence current mutual inductor installed in each feeder line, detection is each in real time
The zero-sequence current of feeder line.If in the periodThe stable Sudden Changing Rate of interior power network neutral point voltage meets：,
The maximum zero-sequence current of any feeder line meets simultaneously：, then being determined as power network, there occurs single-phase earthing, ground connection event
Barrier processing unit enters fault initiating, and singlephase earth fault is handled.If in the periodInterior power network neutral point electricity
The Sudden Changing Rate of pressure meets：, but the zero-sequence current that feeder line is maximum：, then it is determined as being electrical network parameter
Neutral point displacement voltage caused by changeChange, earth fault processing unit do not start；If in the periodInterior distribution
Net neutral point voltage Sudden Changing RateNot lasting reaches, or feeder line maximum zero sequence currentIt is not lasting
Reach, then being determined as power network, Ge is intermittent leaks over the ground there occurs unstable disturbance ground connection, is now grounded
Fault treating apparatus does not enter fault initiating.
If in the periodThe stable Sudden Changing Rate of interior power network neutral point voltage meets：, while any feedback
The stable Sudden Changing Rate of the maximum zero-sequence current of line meets：, then it is determined as power network there occurs single-phase earthing, now
Earth fault processing unit enters fault initiating, and singlephase earth fault is handled.
If in the periodThe Sudden Changing Rate of interior power network neutral point voltage meets：, but the zero of feeder line maximum
The stable Sudden Changing Rate of sequence electric current：, then it is determined as being neutral point displacement voltage caused by electrical network parameter change's
Change, earth fault processing unit does not start.
If in the periodInterior power network neutral point voltage jump amountNot lasting reaches：, or
Feeder line maximum zero sequence currentNot lasting reaches：, then being determined as power network, there occurs unstable disturbance
Ge is intermittent leaks over the ground for ground connection, and now earth fault processing unit does not enter fault initiating.
Present invention tool has the advantage that：
1st, this method is solved using neutral point of electric network position using the fault initiating method of the stable Sudden Changing Rate of neutral point displacement voltage
The absolute value of voltage is moved as failure dead-time problem existing for the fault initiating method of earth fault.
2nd, this method is comprehensive using the stable Sudden Changing Rate of stable Sudden Changing Rate and feeder line maximum zero sequence current of neutral point displacement voltage
Comparison method is closed, avoids the effective ways that single criterion causes Wu to sentence.
3rd, this method uses detection time sectionMethod, compare detection time sectionThe stable mutation value of relevant parameter,
Avoid the intermittent influences leaked over the ground to earth fault processing of unstable disturbance ground connection Ge.
Brief description of the drawings
Fig. 1 is the logic chart that the earth fault based on power network characteristic parameter incremental starts method.
Embodiment
In power distribution network normal operation, by detecting power network neutral point in real time installed in power network neutral point voltage transformer
Displacement voltageAs neutral point steady state voltage, each feeder line zero is detected by the zero sequence current mutual inductor installed in each feeder line in real time
Sequence electric current, then it is superimposed with zero-sequence current increment,, and handleWithCompared to as whether occurring
Single-phase earthing decision method (It can be set according to different electric network compositions and running environment).If in the periodInside match somebody with somebody
The stable increment of neutral point of electric network voltage meets：, while the zero-sequence current of any feeder line maximum meets：, then it is determined as power network there occurs single-phase earthing, now earth fault processing unit enters fault initiating, to list
Phase earth fault is handled.If in the periodThe Sudden Changing Rate of interior power network neutral point voltage meets：, but
The maximum zero-sequence current of feeder line：, then it is determined as being neutral point displacement voltage caused by electrical network parameter change's
Change, earth fault processing unit does not start, now neutral point displacement voltageFor new neutral point stable state
Voltage；If in the periodInterior power network neutral point voltage jump amountNot lasting reaches, or feedback
Line maximum zero sequence currentNot lasting reaches, then being determined as power network, there occurs unstable disturbance ground connection
Ge is intermittent to be leaked over the ground, and now earth fault processing unit does not enter fault initiating.
PeriodTo examine the stabilization time section of Sudden Changing Rate, for excluding unstable disturbance, different earth fault
Processing mode and earth fault processing unit carry out different settings.
The sustained mutations amount of power network neutral point voltage, can be according to different earth fault for fault initiating standard value
Processing mode and earth fault processing unit can carry out different settings.
For the zero-sequence current value detected during each feeder line normal operation,Zero-sequence current is prominent during for single-phase earthing occurs
Become critical value,Different settings can be carried out according to different electric network compositions and earth fault processing unit.
For power network of the neutral point through arc suppression coil compensation, its neutral point displacement voltage is,
Power system operating mode change can centering point displacement voltageImpact, while arc suppression coil adjusts sense and residual flow control also can be right
Neutral point displacement voltageImpact, the method for fault initiating is：In the periodThe stabilization of interior power network neutral point voltage
Sudden Changing Rate meets：, while the stable Sudden Changing Rate of any feeder line maximum zero sequence current meets：, then it is determined as
There occurs single-phase earthing, now earth fault processing unit to enter fault initiating for power network, and singlephase earth fault is handled；Such as
Fruit is in the periodThe stable increment of interior power network neutral point voltage meets：, but feeder line maximum zero sequence current
Sudden Changing Rate：, then it is determined as being neutral point displacement voltage caused by electrical network parameter changeChange, at earth fault
Reason device does not start, now neutral point displacement voltageFor new neutral point steady state voltage.If in the time
SectionInterior power network neutral point voltage jump amountThat does not stablize reaches, or feeder line maximum zero sequence current dashes forward
Variable does not have stable reach, then being determined as power network, Ge is intermittent leaks over the ground there occurs unstable disturbance ground connection,
Now earth fault processing unit does not enter fault initiating, earth fault is not handled.
For neutral point ungrounded electric network, its neutral point displacement voltage is：, the method for fault initiating is：
PeriodThe stable Sudden Changing Rate of interior power network neutral point voltage meets：, while any feeder line zero-sequence current
Stable Sudden Changing Rate meets：, then being determined as power network, there occurs single-phase earthing, now earth fault processing unit entrance event
Barrier starts, and singlephase earth fault is handled；If in the periodThe stable Sudden Changing Rate symbol of interior power network neutral point voltage
Close：, but feeder line maximum zero sequence current Sudden Changing Rate, then it is determined as being neutral caused by electrical network parameter change
Point displacement voltageChange, earth fault processing unit does not start, now neutral point displacement voltageFor
New neutral point steady state voltage.If in the periodInterior power network neutral point voltage jump amountThat does not stablize reaches, or feeder line maximum zero sequence currentThat does not stablize reaches, then it is determined as power network
Ge is intermittent leaks over the ground for unstable disturbance ground connection, and now earth fault processing unit does not enter fault initiating, do not dock
Earth fault is handled.
Described above is only the preferred embodiment of the present invention, and protection scope of the present invention is not limited merely to above-mentioned implementation
Example, all technical schemes belonged under thinking of the present invention belong to protection scope of the present invention.It should be pointed out that for the art
Those of ordinary skill for, some improvements and modifications without departing from the principles of the present invention also should be regarded as the guarantor of the present invention
Protect scope.
Claims (4)
1. a kind of Sudden Changing Rate of singlephase earth fault processing unit starts method, it is characterised in that：By detecting power network neutrality in real time
Point displacement voltage uNThe maximum zero-sequence current i with each feeder linemax0If the Sudden Changing Rate of neutral point of electric network voltage in period Δ T
Meet：Δun≥ΔuNL, while the zero-sequence current of any feeder line maximum meets：imax0≥i0B+Δiδ, then it is determined as power network
Single-phase earthing, now earth fault processing unit enter fault initiating, singlephase earth fault is handled；If in the time
The Sudden Changing Rate of power network neutral point voltage meets in section Δ T：Δun≥ΔuNL, but the zero-sequence current that feeder line is maximum：imax0∠i0B+
Δiδ, then it is determined as being neutral point displacement voltage u caused by electrical network parameter changeNChange, earth fault processing unit do not open
It is dynamic；If the power network neutral point voltage jump amount Δ u in period Δ TNNot lasting reaches Δ un≥ΔuNL, or feeder line
Maximum zero sequence current imax0Not lasting reaches：imax0≥i0B+Δiδ, then it is judged to power network there occurs unstable disturbance to connect
Ground Ge is intermittent to be leaked over the ground, and now earth fault processing unit does not enter fault initiating.
2. a kind of Sudden Changing Rate of singlephase earth fault processing unit according to claim 1 starts method, it is characterised in that：When
Between section Δ T be the duration section for examining Sudden Changing Rate, for excluding unstable disturbance, different earth fault processing modes and
Earth fault processing unit carries out different settings.
3. a kind of Sudden Changing Rate of singlephase earth fault processing unit according to claim 1 starts method, it is characterised in that：Match somebody with somebody
The sustained mutations amount Δ u of neutral point of electric network voltageNLFor fault initiating standard value, can according to different earth fault processing modes and
Earth fault processing unit can carry out different settings.
4. a kind of Sudden Changing Rate of singlephase earth fault processing unit according to claim 1 starts method, it is characterised in that：i0B
For the zero-sequence current value detected during each feeder line normal operation, Δ iδThe mutation standard of zero-sequence current during for single-phase earthing occurs
Value, Δ iδDifferent settings can be carried out according to different electric network compositions and earth fault processing unit.
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| CN201710641356.7A CN107526005B (en) | 2017-07-31 | 2017-07-31 | Sudden change starting method of single-phase earth fault processing device |
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| CN201710641356.7A CN107526005B (en) | 2017-07-31 | 2017-07-31 | Sudden change starting method of single-phase earth fault processing device |
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Cited By (7)
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|---|---|---|---|---|
| CN108287296A (en) * | 2018-02-07 | 2018-07-17 | 李景禄 | One kind being suitable for unbalance grid high resistance earthing fault reverse starting and route selection method |
| CN108321779A (en) * | 2018-03-12 | 2018-07-24 | 李景禄 | A kind of earth fault Intelligent treatment method of Modes for Neutral |
| CN109031035A (en) * | 2018-02-07 | 2018-12-18 | 李景禄 | A kind of otherness one-phase earthing failure in electric distribution network property and fault recovery judgment method |
| CN109633376A (en) * | 2018-12-21 | 2019-04-16 | 国网北京市电力公司 | Handle the method and device of singlephase earth fault |
| CN110031716A (en) * | 2019-03-26 | 2019-07-19 | 国电南瑞科技股份有限公司 | A kind of distribution system distributing fault detection method with resonance grounding |
| CN110632439A (en) * | 2019-09-29 | 2019-12-31 | 国网河南省电力公司电力科学研究院 | Power distribution network single-phase earth fault diagnosis technology based on synchronous waveform and association rule |
| CN112152191A (en) * | 2020-09-01 | 2020-12-29 | 国网陕西省电力公司榆林供电公司 | Fault processing method, device and storage medium for distribution line |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108287296A (en) * | 2018-02-07 | 2018-07-17 | 李景禄 | One kind being suitable for unbalance grid high resistance earthing fault reverse starting and route selection method |
| CN109031035A (en) * | 2018-02-07 | 2018-12-18 | 李景禄 | A kind of otherness one-phase earthing failure in electric distribution network property and fault recovery judgment method |
| CN108321779A (en) * | 2018-03-12 | 2018-07-24 | 李景禄 | A kind of earth fault Intelligent treatment method of Modes for Neutral |
| CN108321779B (en) * | 2018-03-12 | 2019-07-05 | 李景禄 | A kind of ground fault Intelligent treatment method of Modes for Neutral |
| CN109633376A (en) * | 2018-12-21 | 2019-04-16 | 国网北京市电力公司 | Handle the method and device of singlephase earth fault |
| CN110031716A (en) * | 2019-03-26 | 2019-07-19 | 国电南瑞科技股份有限公司 | A kind of distribution system distributing fault detection method with resonance grounding |
| WO2020192156A1 (en) * | 2019-03-26 | 2020-10-01 | 国电南瑞科技股份有限公司 | Distributed fault detection method for power distribution system having resonant grounding |
| CN110632439A (en) * | 2019-09-29 | 2019-12-31 | 国网河南省电力公司电力科学研究院 | Power distribution network single-phase earth fault diagnosis technology based on synchronous waveform and association rule |
| CN112152191A (en) * | 2020-09-01 | 2020-12-29 | 国网陕西省电力公司榆林供电公司 | Fault processing method, device and storage medium for distribution line |
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