CN106597188A - Single-phase ground fault diagnosis method on various conditions of cable, overhead line, and parallel-serial line - Google Patents
Single-phase ground fault diagnosis method on various conditions of cable, overhead line, and parallel-serial line Download PDFInfo
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- CN106597188A CN106597188A CN201611007385.XA CN201611007385A CN106597188A CN 106597188 A CN106597188 A CN 106597188A CN 201611007385 A CN201611007385 A CN 201611007385A CN 106597188 A CN106597188 A CN 106597188A
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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Abstract
The invention, which relates to the technical field of circuit protection, provides a single-phase ground fault diagnosis method on various conditions of a cable, an overhead line, and a parallel-serial line. The method comprises: step a, an opening delta zero-sequence voltage at a PT secondary side is monitored; step b, whether a zero-sequence voltage occurs is determined; step c, whether the frequency of the zero-sequence voltage is a power frequency is determined; is not, a signal is sent out to respond to a moving element of a resonance elimination device; step d, three-phase voltage monitoring data are read; if voltage of one phase or voltages of two phases is/are normal-phase voltages and the voltages of other phases are zero, a PT primary side line-breaking fault is determined; step e, a single-phase ground switch that can be turned on or off normally can be put between a neutral point of the PT and the ground, so that a grounding switch trips and is closed rapidly; and step f, whether the opening delta voltage exists is determined; if so, a single-phase ground fault is determined; and if not, fundamental-frequency ferromagnetic resonance is determined. According to the multi-parameter rapid switch fault determination method, the method can be realized simply and reliably; and a fault loop can be disconnected rapidly by using a quick switch, so that accident extending can be avoided.
Description
Technical field：
The present invention relates to circuit protection technical field, and in particular to singlephase earth fault under cable, built on stilts and series-parallel connection circuit
Method of discrimination.
Background technology：
, under the various different line conditions such as trolley line and series-parallel connection circuit, there is the event of all kinds single-phase earthing in research cable
Security protection of the barrier type to power distribution network has great importance.Existing fault distinguishing method mainly has several, existing
Analyze its feature as follows：1) based on fault current and the method characteristic of voltage magnitude：Apply in general to low-impedance earthed system failure, high resistant
Fault current very little during ground connection, voltage and current amplitude change is not obvious, it is difficult to differentiate.2) based on low-frequency information and high-frequency information
Method.Feature：Power distribution network high resistance earthing fault can be differentiated, it is insensitive to low-impedance earthed system 3) based on wavelet transformation
Method characteristic：Wavelet transformation m- dimensional analysis method when being always, in time domain and frequency domain all there is multiple resolution ratio to characterize letter
The ability of number local feature, can detect the transient state abnormality signal carried secretly in normal signal, be highly suitable for the failure of power distribution network
Detection.The detection algorithm for being currently based on wavelet transformation is that fault-signal is decomposed using wavelet transformation, extract wherein certain
One component, then compare the variable quantity of the component and the size of predetermined threshold value judging system failure type, but hardware threshold
Setting is needed according to expertise, and different system thresholds are typically different, increased the difficulty of differentiation.4) based on ANN
The method characteristic of network：Research shows that the method is highly effective in detecting system high resistance earthing fault, but realizes more difficult；5)
Method based on fuzzy theory.Feature：Although the method based on fuzzy theory can recognize fault type, this method needs
Substantial amounts of fault data is collected, and specific failure phase can not be judged.
The content of the invention：
The technical problem to be solved is to overcome existing technological deficiency, there is provided one kind utilizes computer program
The rapid Judging fault classification of algorithm, implementation method is simple and reliable, it is possible to disconnect fault loop rapidly by high-speed switch, it is to avoid
Single-phase earth fault discrimination method under the cable of the further expansion of accident, built on stilts and series-parallel connection circuit.
The technical problem to be solved is realized using following technical scheme：
Single-phase earth fault discrimination method under cable, built on stilts and series-parallel connection circuit, it is characterised in that：Comprise the following steps.
A, monitoring PT secondary side open delta residual voltages；
B, judge whether residual voltage occur, if residual voltage occur then enters step c, if there is not residual voltage
Into step a；
C, whether be power frequency to residual voltage frequency, if not power frequency, then reach a conclusion, be judged as high frequency, divide it is ferromagnetic
Resonance, sends signal and causes to respond harmonic elimination apparatus moving part；If power frequency then enters step d；
D, reading three-phase-voltage monitoring data, if wherein one phase or two-phase are normal phase voltage, other phase voltages are zero, then
Judgement there occurs PT primary side disconnection faults, and system sends warning signal；If occur be not the case if enter step e；
E, between the neutral point and the earth of PT one normally closed single-phase earthing switch of input, now, open ground connection
Tripping operation is closed, and is overlapped rapidly；
F, judge whether open delta voltage is presence, if existing singlephase earth fault is judged as；If not then judging
To be judged as fundamental frequency ferromagnetic resonance, send signal and cause to respond harmonic elimination apparatus action.
Do not considering fault location, failure line selection is utilized most simple and reliable only for the purpose of fast shut-off faulty line
Excessively stream cut-offs to realize.
Described excessively stream is cut-off for if A phases occur permanent earth fault, A phases high-speed switch closes first shunting failure
The fault current of point, makes failure phase arc extinction；After the several seconds, A phases high-speed switch disconnects, and now permanent earth fault is still
Control system can be made to send ground signalling warning；If ground signalling is yet suffered from, control system instructs perfect phase B phase or C immediately
The high-speed switch closure of phase, causes A phases and B phases two differently phase fault, the failure that the overcurrent of generation passes through faulty line
Phase, its single-phase overcurrent protection act and cut off faulty line, and make to perfect phase B phase at bus or C phases are grounded, be then turned off perfecting
The high-speed switch of phase B phase or C phases, recovers normal operation.
If the method for discrimination that B phases or C phases occur permanent earth fault is consistent with A.
The present invention judges first by the way that whether monitoring electromagnetic voltage transformer secondary side open delta residual voltage occurs
Whether system there occurs single-phase earthing, PT ferromagnetic resonances and PT disconnection faults, if residual voltage is zero, system goes successively to prison
Survey state；If residual voltage is not zero, it is analyzed to whether failure judgement is high frequency or divides humorous to residual voltage frequency
Shake.If frequency is not power frequency, judgement there occurs high frequency or Subharmonic Resonance, sends signal and moves so that accordingly eliminating resonance device
Make；Fault type is determined whether if frequency is power frequency.Three-phase-voltage monitoring data are read, if wherein one phase or two-phase are for just
Normal phase voltage, other phase voltages are zero, then judge to there occurs PT primary side disconnection faults, and system sends warning signal；If occurring
Be not the case, then determine whether singlephase earth fault or fundamental frequency ferromagnetic resonance.In the neutral point and the earth of PT
Between one normally closed single-phase earthing switch of input, now, make earthed switch trip, and overlap rapidly.If open delta
Voltage is caused by resonance, then the zero sequence loop of PT has been cut off in the disconnection of earthed switch, destroys condition of resonance, overlaps again
It is not result in that generation is new to excite and resonance, but recovers normal operation, open delta voltage is 0, is judged as that fundamental frequency is ferromagnetic humorous
Shake, send signal and cause to respond harmonic elimination apparatus action；If open delta voltage is produced by singlephase earth fault, ground connection is opened
Shut-off is opened after coincidence, and open delta voltage is still above threshold value, and the coincidence of single-phase switch does not affect the original voltages of PT to indicate
Function, is judged as singlephase earth fault, and runs next subprogram.
, under the various different line conditions such as trolley line and series-parallel connection circuit, there is the event of all kinds single-phase earthing in research cable
Method of discrimination during barrier type, it is intended to provide original foundation for failure line selection, positioning and high-speed switch arc-extinction device action.
According to theory analysis and simulation calculation to power distribution network dependent failure, to various PT secondary side open deltas are caused
The elevated fault type of magnitude of voltage and failure mechanism carry out theory analysis, the characteristic parameter rule of the various fault types of induction and conclusion
Rule；And the simulation model of different faults type is set up using EMTP electromagnetic transient simulation softwares, it is calculated correlated characteristic parameter
Value, is mutually authenticated with theoretical analysis result.
Isolated neutral distribution system causes the elevated fault type of PT open delta residual voltages to have single-phase earthing event
Barrier, ferromagnetic resonance resonance and PT disconnection faults, through early-stage Study and current period checking arrangement these three fault type features are obtained
Parameter is listed as follows：
The characteristic parameter of power distribution network most common failure type
On the basis of the theory analysis and simulation calculation to various fault types, fast and efficiently single-phase earthing event is proposed
The method of discrimination of barrier, PT ferromagnetic resonances and PT disconnection faults, according to fault distinguishing method, computer programming realizes high-speed switch type
Arc-extinguishing resonance-extinguishing device fault distinguishing method and relevant action strategy.
The invention has the beneficial effects as follows：The present invention is many reference amounts high-speed switch fault distinguishing method, can be according to various failure classes
The characteristics of type parameter, using the rapid Judging fault classification of computer program algorithm, implementation method is simple and reliable, it is possible to by fast
Speed switch is rapid disconnects fault loop, it is to avoid the further expansion of accident.
Description of the drawings：
Fig. 1 is the sub-process figure of method of discrimination and relevant action strategy.
Specific embodiment：
In order that technological means, creation new feature, reached purpose and effect that the present invention is realized are easy to understand, below
With reference to being specifically illustrating, the present invention is expanded on further.
As shown in Figure 1
Single-phase earth fault discrimination method under cable, built on stilts and series-parallel connection circuit, it is characterised in that：Comprise the following steps.
A, monitoring PT secondary side open delta residual voltages；
B, judge whether residual voltage occur, if residual voltage occur then enters step c, if there is not residual voltage
Into step a；
C, whether be power frequency to residual voltage frequency, if not power frequency, then reach a conclusion, be judged as high frequency, divide it is ferromagnetic
Resonance, sends signal and causes to respond harmonic elimination apparatus moving part；If power frequency then enters step d；
D, reading three-phase-voltage monitoring data, if wherein one phase or two-phase are normal phase voltage, other phase voltages are zero, then
Judgement there occurs PT primary side disconnection faults, and system sends warning signal；If occur be not the case if enter step e；
E, between the neutral point and the earth of PT one normally closed single-phase earthing switch of input, now, open ground connection
Tripping operation is closed, and is overlapped rapidly；
F, judge whether open delta voltage is presence, if existing singlephase earth fault is judged as；If not then judging
To be judged as fundamental frequency ferromagnetic resonance, send signal and cause to respond harmonic elimination apparatus action.
Do not considering fault location, failure line selection is utilized most simple and reliable only for the purpose of fast shut-off faulty line
Excessively stream cut-offs to realize.
Excessively stream is cut-off for if A phases occur permanent earth fault, A phases high-speed switch closes first the event of shunting trouble point
Barrier electric current, makes failure phase arc extinction；After the several seconds, A phases high-speed switch disconnects, and now permanent earth fault can still make control
System processed sends ground signalling warning；If ground signalling is yet suffered from, control system instructs perfect the fast of phase B phase or C phases immediately
Speed switch closure, causes A phases and B phases two differently phase fault, the overcurrent of generation to pass through the failure phase of faulty line, its list
Phase overcurrent protection action and cut off faulty line, and make to perfect phase B phase at bus or C phases are grounded, be then turned off perfecting phase B phase or
The high-speed switch of C phases, recovers normal operation.
If the method for discrimination that B phases or C phases occur permanent earth fault is consistent with A.
The general principle and principal character and advantages of the present invention of the present invention has been shown and described above.The technology of the industry
Personnel it should be appreciated that the present invention is not restricted to the described embodiments, the simply explanation described in above-described embodiment and specification this
The principle of invention, without departing from the spirit and scope of the present invention, the present invention also has various changes and modifications, these changes
Change and improvement is both fallen within scope of the claimed invention.The claimed scope of the invention by appending claims and its
Equivalent thereof.
Claims (4)
1. single-phase earth fault discrimination method under cable, built on stilts and series-parallel connection circuit, it is characterised in that：Comprise the following steps.
A, monitoring PT secondary side open delta residual voltages；
B, judge whether residual voltage occur, if residual voltage occur then enters step c, enter if there is not residual voltage
Step a；
C, whether it is power frequency to residual voltage frequency, if not power frequency, then reach a conclusion, is judged as high frequency, frequency dividing ferromagnetic resonance,
Send signal to cause to respond harmonic elimination apparatus moving part；If power frequency then enters step d；
D, reading three-phase-voltage monitoring data, if wherein one phase or two-phase are normal phase voltage, other phase voltages are zero, then judge
PT primary side disconnection faults are there occurs, system sends warning signal；If occur be not the case if enter step e；
E, between the neutral point and the earth of PT one normally closed single-phase earthing switch of input, now, jump earthed switch
Lock, and overlap rapidly；
F, judge whether open delta voltage is presence, if existing singlephase earth fault is judged as；If not being then judged as
Break as fundamental frequency ferromagnetic resonance, send signal and cause to respond harmonic elimination apparatus action.
2. single-phase earth fault discrimination method under cable according to claim 1, built on stilts and series-parallel connection circuit, its feature exists
In：Do not considering fault location, failure line selection is opened only for the purpose of fast shut-off faulty line using most simple and reliable excessively stream
Break to realize.
3. single-phase earth fault discrimination method under cable according to claim 2, built on stilts and series-parallel connection circuit, its feature exists
In：Described excessively stream is cut-off for if A phases occur permanent earth fault, A phases high-speed switch closes first the event of shunting trouble point
Barrier electric current, makes failure phase arc extinction；After the several seconds, A phases high-speed switch disconnects, and now permanent earth fault can still make control
System processed sends ground signalling warning；If ground signalling is yet suffered from, control system instructs perfect the fast of phase B phase or C phases immediately
Speed switch closure, causes A phases and B phases two differently phase fault, the overcurrent of generation to pass through the failure phase of faulty line, its list
Phase overcurrent protection action and cut off faulty line, and make to perfect phase B phase at bus or C phases are grounded, be then turned off perfecting phase B phase or
The high-speed switch of C phases, recovers normal operation.
4. single-phase earth fault discrimination method under cable, built on stilts and series-parallel connection circuit according to claim 1,2 or 3, it is special
Levy and be：If the method for discrimination that B phases or C phases occur permanent earth fault is consistent with A.
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Cited By (8)
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| CN107132464A (en) * | 2017-06-09 | 2017-09-05 | 合肥远见电力科技有限公司 | A kind of bus insulation monitoring system |
| CN108318762A (en) * | 2018-02-28 | 2018-07-24 | 南京南瑞继保电气有限公司 | The method of discrimination of voltage transformer power frequency ferromagnetic resonance |
| CN108508314A (en) * | 2018-02-24 | 2018-09-07 | 安徽合凯电气科技股份有限公司 | A kind of high-precision route selection tripgear |
| CN109375056A (en) * | 2018-10-19 | 2019-02-22 | 国网浙江省电力有限公司电力科学研究院 | Distribution broken string is grounded live test loop and fault simulation platform and test method |
| CN112067944A (en) * | 2020-09-09 | 2020-12-11 | 国网江苏省电力有限公司盐城供电分公司 | Single-phase grounding fault detection control method for power transmission and distribution line |
| CN112255573A (en) * | 2020-11-20 | 2021-01-22 | 国网江苏省电力有限公司盐城供电分公司 | Single-phase earth fault processing method for neutral point ungrounded system |
| CN113644622A (en) * | 2021-01-18 | 2021-11-12 | 保定钰鑫电气科技有限公司 | Device for auxiliary treatment of interphase short circuit |
| CN113671412A (en) * | 2021-09-10 | 2021-11-19 | 国网安徽省电力有限公司检修分公司 | Low-current grounding line selection device |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107132464A (en) * | 2017-06-09 | 2017-09-05 | 合肥远见电力科技有限公司 | A kind of bus insulation monitoring system |
| CN108508314A (en) * | 2018-02-24 | 2018-09-07 | 安徽合凯电气科技股份有限公司 | A kind of high-precision route selection tripgear |
| CN108318762A (en) * | 2018-02-28 | 2018-07-24 | 南京南瑞继保电气有限公司 | The method of discrimination of voltage transformer power frequency ferromagnetic resonance |
| CN108318762B (en) * | 2018-02-28 | 2020-09-08 | 南京南瑞继保电气有限公司 | Method for judging power frequency ferromagnetic resonance of voltage transformer |
| CN109375056A (en) * | 2018-10-19 | 2019-02-22 | 国网浙江省电力有限公司电力科学研究院 | Distribution broken string is grounded live test loop and fault simulation platform and test method |
| CN109375056B (en) * | 2018-10-19 | 2023-11-07 | 国网浙江省电力有限公司电力科学研究院 | Distribution network broken line grounding live test loop, fault simulation platform and test method |
| CN112067944A (en) * | 2020-09-09 | 2020-12-11 | 国网江苏省电力有限公司盐城供电分公司 | Single-phase grounding fault detection control method for power transmission and distribution line |
| CN112255573A (en) * | 2020-11-20 | 2021-01-22 | 国网江苏省电力有限公司盐城供电分公司 | Single-phase earth fault processing method for neutral point ungrounded system |
| CN112255573B (en) * | 2020-11-20 | 2022-12-23 | 国网江苏省电力有限公司盐城供电分公司 | Single-phase earth fault processing method for neutral point ungrounded system |
| CN113644622A (en) * | 2021-01-18 | 2021-11-12 | 保定钰鑫电气科技有限公司 | Device for auxiliary treatment of interphase short circuit |
| CN113644622B (en) * | 2021-01-18 | 2023-07-18 | 保定钰鑫电气科技有限公司 | Device for assisting in processing interphase short circuit |
| CN113671412A (en) * | 2021-09-10 | 2021-11-19 | 国网安徽省电力有限公司检修分公司 | Low-current grounding line selection device |
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