CN104569729B - One-phase earthing failure in electric distribution network detection method and system based on fault detector - Google Patents
One-phase earthing failure in electric distribution network detection method and system based on fault detector Download PDFInfo
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The invention discloses one-phase earthing failure in electric distribution network detection method and systems.Method acquires and checks the first zero crossing of phase current comprising steps of S1 and record the first zero passage markers；S2 acquires and checks the second zero crossing of phase current and records the second zero passage markers；First zero passage markers is compared with the second zero passage markers, calculates phase changing capacity by S3；S4, judges whether phase changing capacity is greater than phase change designated value, if yes then enter step S5, otherwise return step S1；S5 according to S4 judging result judges whether that ground fault occurs.System includes current sensor, checks module and processing module.Present invention feature different from non-faulting phase in fault point front and back, failure phase of the steady-state current phase place variation before and after failure generation using distribution network system, to determine ground fault.It greatly reduces power consumption and improves service life, improve the accuracy rate of judgement.It the composite can be widely applied to various isolated neutral distribution network fault detection systems.
Description
Technical field
The present invention relates to distribution network fault location more particularly to a kind of one-phase earthing failure in electric distribution network detection method,
The invention further relates to a kind of one-phase earthing failure in electric distribution network detection systems.
Background technique
Fault detector is a kind of power equipment that can be directly anchored on single power cable, can pass through open C T
Sensor, electric-field sensor etc. carry out collection voltages current signal, and then judge whether break down on route, and breaking down
It is prompted in a manner of board turning, flash of light etc. afterwards.
In the prior art, the isolated neutral one-phase earthing failure in electric distribution network determination method based on fault detector, it is main
Have:
1) first half-wave method (transient current method).
The technology carries out high-speed sampling to fault current, using the amplitude of faulty line capacitance current and voltage head half-wave and
Direction feature different from normal condition carries out Earth Fault Detection.This mode has the disadvantage that
A. the premise of the principle is that moment generation occurs for failure in voltage peaks, just will appear obvious characteristic, if
Ground fault occurs near voltage over zero, then resolution principle fails.
B. the amplitude and phase data for needing moment collection voltages electric current, cause fault detector overall power bigger than normal, this
For as not maintainable fault detector, it is meant that service life reduces.
2) capacitance current is mutated method.
The principle that the technology will increase using capacitance current after ground fault, by detecting the increase of phase current virtual value,
To carry out Earth Fault Detection.This mode has the disadvantage that
A. the phase current that fault detector measures is the vector sum of capacitance current and load current, can not independent measurement electricity
Capacitance current.In fact, capacitance current has since load current generally differs 90 degree or more in the phase angle of perception and capacitance current
The increase of valid value, the whole phase current virtual value after not necessarily will lead to Vector modulation increase, instead it is possible that constant or even change
It is small.Therefore this method is incomplete in principle.
3) injection method.
The signal generated when the technology does not utilize failure to occur itself, but additionally artificially manufactured by third party device
One characteristic signal, which passes sequentially through route, earth fault and the earth and is formed into a loop, thus in fault point upstream
Fault detector can experience the signal, and downstream is then not felt by, and finally realize fault location.The technology and technology 1,2
It compares, has the higher advantage of determination rate of accuracy, but have the disadvantage that
A. when the high resistance grounding of fault point, characteristic signal will greatly be weakened, to reduce determination rate of accuracy.
B. optional equipment is needed to put into signal generating source, investment is big.
C. signal source is unconventional primary equipment, and can change electrical network parameter when investment, will bring safety hidden to power grid
Suffer from.
In conclusion above method has disadvantage, using fault detector made of these methods, asked there are a variety of
It inscribes, performs poor in practical application.
Summary of the invention
In order to solve the above-mentioned technical problem, it is high, small power consumption that the object of the present invention is to provide a kind of breakdown judge accuracys rate
Isolated neutral one-phase earthing failure in electric distribution network detection method and system.
The technical scheme adopted by the invention is that:
A kind of one-phase earthing failure in electric distribution network detection method based on fault detector comprising step: S1 is acquired and is examined
It looks into the first zero crossing of phase current and records the first zero passage markers；S2 acquires and checks the second zero crossing of phase current and records second
Zero passage markers；First zero passage markers is compared with the second zero passage markers, calculates phase changing capacity by S3；S4 judges phase
Whether variable quantity is greater than phase change designated value, if yes then enter step S5, otherwise return step S1；S5 judges according to S4
As a result, judging whether that ground fault occurs.
Preferably, the step S1 specifically includes sub-step: S11, acquires phase current using current sensor；S12, to phase
Current signal carries out low-pass filtering and obtains fundamental wave；S13 checks the first zero crossing of phase current and records a zero passage markers；The step
Rapid S2 specifically includes sub-step, and: S21 acquires phase current using current sensor；S22 carries out low-pass filtering to phase current signal
Obtain fundamental wave；S23 checks the second zero crossing of phase current and records two zero passage markers.
Preferably, the step S4 specifically: judge whether phase becomes smaller and the degree to become smaller refers to greater than phase change
Definite value, if yes then enter step S5, otherwise return step S1.
Preferably, the step S5 specifically includes sub-step: S51, detects voltage value using voltage sensor；S52, if
Voltage value variation is more than voltage change designated value, is judged as ground fault, otherwise return step S1.
Preferably, the step S52 specifically: whether calculating electric field, which meets down ratio, is more than 30% and is continued above
Specified time such as meets, is judged as ground fault, otherwise return step S1.
A kind of one-phase earthing failure in electric distribution network detection system based on fault detector is referred to for implementing one kind based on failure
Show the one-phase earthing failure in electric distribution network detection method of device comprising: current sensor, for acquiring phase current in different time points
Signal；Module is checked, for checking phase current signal and recording the zero passage markers of phase current signal；Processing module, for comparing
The zero passage markers of the phase current signal of different time points acquisition, calculates the phase changing capacity of phase current, and then judge whether to occur
Ground fault.
It preferably, further include voltage sensor, the voltage sensor is used for collection voltages value signal, the processing mould
Root tuber changes according to phase changing capacity and voltage value signal, judges whether that ground fault occurs.
Preferably, the current sensor, voltage sensor, inspection module and processing module are arranged at fault detector
On, the phase current passes through cable transmission, is provided with multiple fault detectors on the cable.
Preferably, the fault detector is additionally provided with rotary pan apparatus and LED light, and the rotary pan apparatus and LED light are used for
Indicate fault message.
The beneficial effects of the present invention are:
Using isolated neutral distribution network system, the steady-state current phase place before and after failure generation changes in failure the present invention
Point front and back, failure the phase feature different from non-faulting phase, to determine ground fault.Due to abandoned it is original it is insecure,
The transient signal of ultra-high speed sampling high power consumption is needed, and uses the steady-state current phase place signal for being easy measurement, therefore greatly drop
Low power consumption improves service life, improves the accuracy rate of judgement.
It the composite can be widely applied to various isolated neutral distribution network fault detection systems.
Detailed description of the invention
Specific embodiments of the present invention will be further explained with reference to the accompanying drawing:
Fig. 1 is a kind of method flow diagram of embodiment of one-phase earthing failure in electric distribution network detection method of the present invention；
Fig. 2 is isolated neutral power distribution network three-phase current schematic equivalent circuit；
Each current and voltage signals phasor diagram when Fig. 3 is ground fault of the present invention；
Fig. 4 is a kind of embodiment circuit diagram of one-phase earthing failure in electric distribution network detection system of the present invention.
Specific embodiment
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
Mutually combination.
As shown in Figure 1, a kind of one-phase earthing failure in electric distribution network detection method based on fault detector comprising step:
S1 acquires and checks the first zero crossing of phase current and records the first zero passage markers；S2 is acquired and is checked the second zero crossing of phase current
And record the second zero passage markers；First zero passage markers is compared with the second zero passage markers, calculates phase changing capacity by S3；
S4, judges whether phase changing capacity is greater than phase change designated value, if yes then enter step S5, otherwise return step S1；S5,
According to S4 judging result, judge whether that ground fault occurs.
Preferably, the step S1 specifically includes sub-step: S11, acquires phase current using current sensor；S12, to phase
Current signal carries out low-pass filtering and obtains fundamental wave；S13 checks the first zero crossing of phase current and records a zero passage markers；The step
Rapid S2 specifically includes sub-step, and: S21 acquires phase current using current sensor；S22 carries out low-pass filtering to phase current signal
Obtain fundamental wave；S23 checks the second zero crossing of phase current and records two zero passage markers.
Preferably, the step S4 specifically: judge whether phase becomes smaller and the degree to become smaller refers to greater than phase change
Definite value, if yes then enter step S5, otherwise return step S1.
Preferably, the step S5 specifically includes sub-step: S51, detects voltage value using voltage sensor；S52, if
Voltage value variation is more than voltage change designated value, is judged as ground fault, otherwise return step S1.
Preferably, the step S52 specifically: whether calculating electric field, which meets down ratio, is more than 30% and is continued above
Specified time such as meets, is judged as ground fault, otherwise return step S1.In the embodiment, while meeting electric field decline 30%
And when for 5 seconds above, it is judged to ground fault.
As shown in figure 4, a kind of one-phase earthing failure in electric distribution network detection system based on fault detector, for implementing one kind
One-phase earthing failure in electric distribution network detection method based on fault detector comprising: current sensor, in different time points
Acquire phase current signal；Module is checked, for checking phase current signal and recording the zero passage markers of phase current signal；Handle mould
Block, the zero passage markers of the phase current signal for comparing different time points acquisition, calculates the phase changing capacity of phase current, and then sentence
It is disconnected whether ground fault to occur.
It preferably, further include voltage sensor, the voltage sensor is used for collection voltages value signal, the processing mould
Root tuber changes according to phase changing capacity and voltage value signal, judges whether that ground fault occurs.
Preferably, the current sensor, voltage sensor, inspection module and processing module are arranged at fault detector
On, the phase current passes through cable transmission, is provided with multiple fault detectors on the cable.Preferably, the indicating fault
Device is additionally provided with rotary pan apparatus and LED light, and the rotary pan apparatus and LED light are used to indicate fault message.As shown in figure 4, in electricity
Multiple fault detectors are provided on cable, when ground fault occurs in a certain position P of C phase, corresponding fault detector 1 and 2 is turned over
Board, fault detector 3 and other equal not board turnings, thus can easily judge earth fault occur fault detector 2 and 3 it
Between, and Earth Phase is C phase.
The present invention is applied to isolated neutral power distribution network, since isolated neutral distribution network system is earth-free side
Formula, i.e. suspension system should not generate any influence to system in principle, but in fact, matching when singlephase earth fault occurs
There are distribution capacity between electric line and the earth, so that distribution system and the earth system be connected.
Phase current I=I in every line phaseL+IC, wherein ILFor load current, ICFor capacitance current.Before failure occurs
Afterwards, ILDo not change, therefore ICVariation how changing for phase current just determined.
As shown in Fig. 2, three phase capacitance has A, B, C three-phase, C01、 C02And C0SRespectively route I, route II and bus
Three relatively equivalent capacitys.When normal operation, the electric current on every route is the vector sum of load current and capacitance current.When
After A phase ground fault occurs for route II, C01-A(C01In the equivalent capacity of A phase), C02-AAnd C0S-AIt is shorted, all non-faulting
In the failure phase of route, it is no longer flow through capacitance current；Non-faulting phase (B, C phase) direct-to-ground capacitance both end voltage of all routes is by phase
Voltage rises to line voltage, and capacitance current phase and size change, and are all flowed back to by fault point.
The capacitance current direction that every route flows to faulty line is identical, size according to its line mutual-ground capacitor size and
It is fixed, therefore analyze the variation of capacitance current before and after single line failure.Use route II phase electricity after phasor diagram analysis failure
Capacitance current is as shown in Figure 3.By analysis result it is found that after failure, A phase capacitance current IA2Size becomes original 3 times, and direction is kept
It is constant, i.e. still 90 ° of leading voltage.In Fig. 2 and Fig. 3, IB2For B phase capacitance current, IC2For C phase capacitance current, Ua is A phase electricity
Pressure, Uba are that B phase and A phase voltage are poor, and Uca is that C phase and A phase voltage are poor, and P is earth fault.
It is added after All other routes it is found that failure phase capacitance current size becomes full line electricity after singlephase earth fault occurs
Three times of capacitance current sum, direction is constant, is still Ua90 ° of leading voltage.Since load current is constant, capacitance current becomes larger, and
Load current phase is generally higher than -90 ° less than 90 °, therefore the phase of its vector sum phase current is bound to become smaller.Behind fault point by
It disappears in -90 ° of capacitance currents, so that phase current phase is bound to become larger.
The present invention judges ground fault information by the variation of detection phase current phase, effectively increases ground fault judgement
Accuracy rate；Without doing real-time quick high-frequency sampling, fault detector power consumption is greatly reduced, to improve fault detector
Service life；Without additionally putting into signal generating source, effective raising power grid security performance while cost is reduced.
It the composite can be widely applied to various isolated neutral distribution network fault detection systems.
It is to be illustrated to preferable implementation of the invention, but the invention is not limited to the implementation above
Example, those skilled in the art can also make various equivalent variations on the premise of without prejudice to spirit of the invention or replace
It changes, these equivalent deformations or replacement are all included in the scope defined by the claims of the present application.
Claims (8)
1. a kind of one-phase earthing failure in electric distribution network detection method based on fault detector, which is characterized in that itself comprising steps of
S1 acquires and checks the first zero crossing of phase current and records the first zero passage markers；
S2 acquires and checks the second zero crossing of phase current and records the second zero passage markers；The first zero passage markers and the second mistake
The phase current that the same line road is designated as when zero acquires phase current signal in different time points；
First zero passage markers is compared with the second zero passage markers, calculates phase changing capacity by S3；
S4, judges whether phase changing capacity is greater than phase change designated value, if yes then enter step S5, otherwise return step
S1；
S5 according to S4 judging result judges whether that ground fault occurs；
The method also includes judging whether that ground fault occurs using following constraint condition step:
First constraint condition: the phase current I=I in every line phaseL+IC, wherein ILFor load current, ICFor capacitance current,
Front and back, load current I occur for failureLDo not change, therefore capacitance current ICVariation just determine how phase current will change；
Second constraint condition: after singlephase earth fault occurs, failure phase capacitance current ICSize becomes full line capacitance current sum
Three times, direction is constant, is still 90 ° of leading voltage, due to load current ILIt is constant, capacitance current ICBecome larger, and load current IL
Phase is greater than -90 ° and less than 90 °, therefore capacitance current ICWith load current ILThe phase of vector sum phase current be bound to become
Small, the capacitance current behind fault point due to -90 ° disappears, so that phase current phase is bound to become larger；
The power distribution network is isolated neutral power distribution network.
2. a kind of one-phase earthing failure in electric distribution network detection method based on fault detector according to claim 1, special
Sign is,
The step S1 specifically includes sub-step:
S11 acquires phase current using current sensor；
S12 carries out low-pass filtering to phase current signal and obtains fundamental wave；
S13 checks the first zero crossing of phase current and records the first zero passage markers；
The step S2 specifically includes sub-step:
S21 acquires phase current using current sensor；
S22 carries out low-pass filtering to phase current signal and obtains fundamental wave；
S23 checks the second zero crossing of phase current and records the second zero passage markers.
3. a kind of one-phase earthing failure in electric distribution network detection method based on fault detector according to claim 1, special
Sign is, the step S4 specifically: judge whether phase becomes smaller and the degree to become smaller is greater than phase change designated value, if
It is to enter step S5, otherwise return step S1.
4. a kind of one-phase earthing failure in electric distribution network detection based on fault detector according to any one of claims 1 to 3
Method, which is characterized in that the step S5 specifically includes sub-step:
S51 detects voltage value using voltage sensor；
S52 is judged as ground fault, otherwise return step S1 if voltage value variation is more than voltage change designated value.
5. a kind of one-phase earthing failure in electric distribution network detection system based on fault detector, which is characterized in that for implementing as weighed
Benefit requires a kind of 1 to 4 described in any item one-phase earthing failure in electric distribution network detection methods based on fault detector comprising:
Current sensor, for acquiring phase current signal in different time points；
Module is checked, for checking phase current signal and recording the zero passage markers of phase current signal；
Processing module, the zero passage markers of the phase current signal for comparing different time points acquisition, the phase for calculating phase current become
Change amount, and then judge whether that ground fault occurs；
The system also includes judge whether that ground fault occurs using following constraint condition step:
First constraint condition: the phase current I=I in every line phaseL+IC, wherein ILFor load current, ICFor capacitance current,
Front and back, load current I occur for failureLDo not change, therefore capacitance current ICVariation just determine how phase current will change；
Second constraint condition: after singlephase earth fault occurs, failure phase capacitance current ICSize becomes full line capacitance current sum
Three times, direction is constant, is still 90 ° of leading voltage, due to load current ILIt is constant, ICCapacitance current becomes larger, and load current IL
Phase is greater than -90 ° and less than 90 °, therefore capacitance current ICWith load current ILThe phase of vector sum phase current be bound to become
Small, the capacitance current behind fault point due to -90 ° disappears, so that phase current phase is bound to become larger；
The power distribution network is isolated neutral power distribution network.
6. a kind of one-phase earthing failure in electric distribution network detection system based on fault detector according to claim 5, special
Sign is, further includes voltage sensor, and the voltage sensor is used for collection voltages value, and the processing module becomes according to phase
Change amount and voltage value variation, judge whether that ground fault occurs.
7. a kind of one-phase earthing failure in electric distribution network detection system based on fault detector according to claim 6, special
Sign is that the current sensor, voltage sensor check that module and processing module are arranged on fault detector, described
Phase current passes through cable transmission, is provided with multiple fault detectors on the cable.
8. a kind of one-phase earthing failure in electric distribution network detection system based on fault detector according to claim 7, special
Sign is that the fault detector is additionally provided with rotary pan apparatus and LED light, and the rotary pan apparatus and LED light are used to indicate failure
Information.
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| CN105738761A (en) * | 2015-12-31 | 2016-07-06 | 山东安亚电子信息有限公司 | Line single-phase grounding fault judging method for overhead fault indicators |
| FI126892B (en) | 2016-05-23 | 2017-07-31 | Emtele Oy | Felströmindikator |
| CN109740105B (en) * | 2018-12-29 | 2024-04-30 | 江苏金智科技股份有限公司 | Power frequency magnetic field interference resistance method for bus protection device |
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| CN1327235C (en) * | 2002-03-24 | 2007-07-18 | 淄博科汇电气有限公司 | Method for detecting ground fault in DC system |
| CN100371724C (en) * | 2005-02-26 | 2008-02-27 | 重庆大学 | Earth fault line-selecting method for arc suppression coil earthing system |
| KR100709980B1 (en) * | 2005-10-21 | 2007-04-20 | 명지대학교 산학협력단 | Method and apparatus for detecting a fault section using comparison of phase difference and magnitude difference bewteen zero phase currents in ungrounded distribution power systems |
| JP2008241668A (en) * | 2007-03-29 | 2008-10-09 | Daihen Corp | Ground fault detector |
| CN201045627Y (en) * | 2007-04-09 | 2008-04-09 | 王廷严 | Intelligent power line fault indicator |
| JP2011072163A (en) * | 2009-09-28 | 2011-04-07 | Daihen Corp | Ground fault direction finding apparatus |
| CN101915884B (en) * | 2010-08-13 | 2012-05-23 | 苏州市电通电力电子有限公司 | Identification method of ground fault phases in three-phase ungrounded system and identification device thereof |
| FR2963967B1 (en) * | 2010-08-20 | 2012-08-17 | Schneider Electric Ind Sas | DIRECTIONAL DETECTION OF EARTH FAULT WITH SINGLE SENSOR |
| CN102087330A (en) * | 2010-11-26 | 2011-06-08 | 上海电力带电作业技术开发有限公司 | Ultrahigh-tension line fault detection and location method and fault detection and location device |
| CN202002994U (en) * | 2011-03-08 | 2011-10-05 | 武汉鑫恒泰电器有限公司 | Electric-loop grounding-fault rapid tester |
| CN102608484A (en) * | 2012-03-14 | 2012-07-25 | 北京中电欧亚科技有限公司 | Fault indictor for power distribution lines |
| CN102928739A (en) * | 2012-11-02 | 2013-02-13 | 华北电力大学（保定） | Method and system used for locating power grid single-phase ground faults and based on wireless sensor network |
| CN103884959A (en) * | 2013-12-31 | 2014-06-25 | 江苏省电力公司镇江供电公司 | Power supply line fault locating instrument and fault locating method |
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