CN106646136B - Band damping turn-adjusting arc-extinguishing winding single-phase ground fault distance measuring method in parallel and system - Google Patents
Band damping turn-adjusting arc-extinguishing winding single-phase ground fault distance measuring method in parallel and system Download PDFInfo
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- CN106646136B CN106646136B CN201611234590.XA CN201611234590A CN106646136B CN 106646136 B CN106646136 B CN 106646136B CN 201611234590 A CN201611234590 A CN 201611234590A CN 106646136 B CN106646136 B CN 106646136B
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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
Abstract
The invention discloses a kind of band parallel connection damping turn-adjusting arc-extinguishing winding single-phase ground fault distance measuring method and systems, wherein this method comprises: controlling anti-parallel thyristor triggering and conducting in short-term using microprocessor, and then generates disturbing signal；The disturbing signal includes disturbance voltage signal and current perturbation signal；Disturbing signal is extracted in faulty line outlet end；Fourier transformation analysis is carried out to the disturbing signal of extraction, according to the linear relationship of disturbance voltage and current perturbation in frequency domain, obtains the equivalent impedance data at different frequencies with damping turn-adjusting arc-extinguishing winding singlephase earth fault in parallel；Impedance data equivalent under different frequency is constructed into equation group with the equivalent impedance expression formula simultaneous of the singlephase earth fault with damping turn-adjusting arc-extinguishing winding in parallel, fault distance can be obtained in solve system of equation.
Description
Technical field
The invention belongs to field of fault detection more particularly to a kind of band parallel connection damping turn-adjusting arc-extinguishing winding single-phase earthing events
Hinder distance measuring method and system.
Background technique
Since power distribution network is the end link to sharing of load electric energy, structure is complicated, and branch is numerous, therefore is easy to happen and connects
Earth fault especially singlephase earth fault.If handled not in time after singlephase earth fault occurs, failure expansion may be caused
It dissipates, causes damages to the operation of power grid.Therefore, fast and accurately fault location technology is safely operated distribution and guarantees to supply
Electric reliability is of great significance.
Fault localization, which refers to, directly calculates fault distance using the electric information on faulty line, mainly there is impedance
2 class method of method and traveling wave method.Voltage when impedance method mainly utilizes failure on route, current information calculate line impedance, in turn
Calculate fault distance, impedance method application is simple, and cost is cheap, but is easy to be influenced by factors such as ground resistance and loads.Row
Wave method is mainly to reach the time of test point using the transient state travelling wave generated when breaking down to calculate fault distance.In view of matching
Electric network composition is complicated, and branch is numerous, so that the refracted wave of transient state travelling wave, back wave are excessive, should not differentiate, and produces to the precision of ranging
Raw certain influence.
China's middle voltage distribution networks neutral point is widely used through the grounding through arc method of operation.Recently as capacity, pressure resistance
With being gradually increased for reliability, electronic power switch device because its movement it is swiftness due to start be applied to resonant earthed system in
The adjusting of arc suppression coil, such as switching of " turn-adjusting " arc suppression coil damped resistor, the throwing of " capacitor tuning type " arc suppression coil compensation capacitor
It cuts.
And existing single-phase ground fault distance measuring method needs to measure positive and negative, the residual voltage current data of faulty line,
Correlation matrix is write according to the relationship column between voltage and current, fault distance is calculated according to iterative method.This method makes actual measurement
Middle data collection capacity is more and speed is slow, since existing single-phase ground fault distance measuring method calculates fault distance using iterative method,
The a large amount of time is wasted, causes the real-time of fault distance-finding method insufficient.
Summary of the invention
In order to solve the disadvantage that the prior art, the first object of the present invention are to provide a kind of band parallel connection damping turn-adjusting extinguishing arc
Coil single-phase ground fault distance measuring method.
Band damping turn-adjusting arc-extinguishing winding in parallel is to be connected in parallel inductance and damping resistance, when band damping turn-adjusting in parallel
When the singlephase earth fault of arc suppression coil, off state is constantly in the concatenated anti-parallel thyristor of damping resistance.
A kind of band parallel connection of the invention damps turn-adjusting arc-extinguishing winding single-phase ground fault distance measuring method, specifically includes:
Step 1: controlling anti-parallel thyristor triggering and conducting in short-term using microprocessor, and then generate disturbing signal；Institute
Stating disturbing signal includes disturbance voltage signal and current perturbation signal；
Step 2: extracting disturbing signal in faulty line outlet end；
Step 3: Fourier transformation analysis being carried out to the disturbing signal of extraction, according to disturbance voltage and current perturbation in frequency domain
Interior linear relationship obtains the equivalent impedance number at different frequencies with damping turn-adjusting arc-extinguishing winding singlephase earth fault in parallel
According to；
Step 4: by impedance data equivalent under different frequency and the single-phase earthing event with damping turn-adjusting arc-extinguishing winding in parallel
The equivalent impedance expression formula simultaneous of barrier constructs equation group, and fault distance can be obtained in solve system of equation.
This method of the invention only needs to extract the disturbance voltage signal and current perturbation signal of faulty line, this is in reality
The acquisition speed of data can be greatly speeded up in measurement, and does not need to calculate using iterative method, so that fault distance-finding method pair
Requirement of real-time is stringent, shortens and calculates the time, ensure that the real-time of fault distance-finding method, and the present invention is obtaining data
While, only data preparation need to can be calculated fault distance.
The equivalent impedance expression formula of the singlephase earth fault with damping turn-adjusting arc-extinguishing winding in parallel in the step 4
Finding process are as follows:
Construct the singlephase earth fault model with damping turn-adjusting arc-extinguishing winding in parallel；
It is equal to the ratio of voltage and electric current further according to resistance, calculates the equivalent impedance expression formula of singlephase earth fault model.
The present invention is using the disturbance voltage and current perturbation measured, and the band damping turn-adjusting arc-extinguishing winding in parallel constructed
Singlephase earth fault model, can rapidly and accurately solve the equivalent impedance expression formula of singlephase earth fault model.
This method further includes carrying out redundancy processing to the equivalent impedance data under different frequency.
Redundancy processing is carried out to the equivalent impedance data under different frequency, the accuracy of data is ensure that, improves failure
The precision that distance calculates.
Redundancy processing is carried out to the equivalent impedance data under different frequency using least square method.Utilize least square method energy
Enough maximize accurately handles data redundancy, improves the data accuracy of computing impedance.
Further, disturbing signal is extracted using the method that adjacent cycle subtracts each other in faulty line outlet end.
The method that adjacent cycle subtracts each other can be used in faulty line outlet end and extract disturbance voltage and current perturbation signal, i.e.,
Subtracted each other by the waveform containing disturbing signal and the normal waveform without containing disturbing signal, can will be superimposed upon on background waveform
Disturbance extracts.The method for extracting signal is substantially a kind of nonlinear filtering, it can do the various periodicity in background
It disturbs and filters out, and then guarantee the accuracy that disturbance is extracted.
The second object of the present invention is to provide a kind of band parallel connection damping turn-adjusting arc-extinguishing winding single-phase ground fault distance measuring system
System.
A kind of band parallel connection of the invention damps turn-adjusting arc-extinguishing winding single-phase ground fault distance measuring system, and band damping in parallel is adjusted
Circle formula arc suppression coil is to be connected in parallel inductance and damping resistance, when the single-phase earthing event with damping turn-adjusting arc-extinguishing winding in parallel
When barrier, it is constantly in off state with the concatenated anti-parallel thyristor of damping resistance, which includes:
Microprocessor is connected with inverse parallel crystalline substance lock；The microprocessor is configured as: control anti-parallel thyristor is in short-term
Triggering and conducting, and then generate disturbing signal；The disturbing signal includes disturbance voltage signal and current perturbation signal；
Signal pickup assembly is used to acquire the electric signal containing disturbing signal at faulty line beginning and without thanksing for your hospitality
The electric signal of dynamic signal is simultaneously sent to fault localization processor；
Fault localization processor, is configured as:
Disturbing signal is extracted using the method that adjacent cycle subtracts each other；
Fourier transformation analysis is carried out to the disturbing signal of extraction, according to the line of disturbance voltage and current perturbation in frequency domain
Sexual intercourse obtains the equivalent impedance data at different frequencies with damping turn-adjusting arc-extinguishing winding singlephase earth fault in parallel；
By impedance data equivalent under different frequency with it is in parallel damping turn-adjusting arc-extinguishing winding singlephase earth fault etc.
Impedance expression simultaneous is imitated to construct equation group, fault distance can be obtained in solve system of equation.
The system of the invention does not need the positive and negative zero sequence signal of measuring system, it is only necessary to extract the disturbance electricity of faulty line
Press signal and current perturbation signal, this can greatly speed up the acquisition speed of data in actual measurement, and do not need using
Iterative method calculates, so that fault localization process is stringent to requirement of real-time, shortens and calculates the time, ensure that fault localization process
Real-time, and the present invention is while obtaining data, only data preparation can need to be calculated fault distance.
Further, the fault localization processor, is also configured to
Construct the singlephase earth fault model with damping turn-adjusting arc-extinguishing winding in parallel；
It is equal to the ratio of voltage and electric current further according to resistance, calculates the equivalent impedance expression formula of singlephase earth fault model.
The present invention is using the disturbance voltage and current perturbation measured, and the band damping turn-adjusting arc-extinguishing winding in parallel constructed
Singlephase earth fault model, can rapidly and accurately solve the equivalent impedance expression formula of singlephase earth fault model.
Further, the fault localization processor is also configured to carry out the equivalent impedance data under different frequency
Redundancy processing.
Redundancy processing is carried out to the equivalent impedance data under different frequency, the accuracy of data is ensure that, improves failure
The precision that distance calculates.
Further, the fault localization processor, be also configured to using least square method under different frequency etc.
It imitates impedance data and carries out redundancy processing.It can be maximized using least square method and accurately handle data redundancy, improved and calculate resistance
Anti- data accuracy.
Further, the fault localization processor is also configured in faulty line outlet end using adjacent cycle phase
The method that subtracts extracts disturbing signal.
The method that adjacent cycle subtracts each other can be used in faulty line outlet end and extract disturbance voltage and current perturbation signal, i.e.,
Subtracted each other by the waveform containing disturbing signal and the normal waveform without containing disturbing signal, can will be superimposed upon on background waveform
Disturbance extracts.The method for extracting signal is substantially a kind of nonlinear filtering, it can do the various periodicity in background
It disturbs and filters out, and then guarantee the accuracy that disturbance is extracted.
Further, the fault localization processor is also connected with display screen, and the display screen is for showing fault distance.
Further, the fault localization processor is also connected with server, the server and remote monitoring terminal phase
Even.The calculated event of fault localization processor can be obtained in real time by remote monitoring terminal by making remote monitoring personnel so also
Hinder distance.
The invention has the benefit that
The present invention does not need the positive and negative zero sequence signal of measuring system, it is only necessary to extract faulty line disturbance voltage signal and
Current perturbation signal, this can greatly speed up the acquisition speed of data in actual measurement, and not need using iterative method meter
It calculates, so that fault distance-finding method is stringent to requirement of real-time, shortens and calculate the time, ensure that the real-time of fault distance-finding method
Property, and data preparation only need to can be calculated fault distance while obtaining data by the present invention.
Detailed description of the invention
Fig. 1 is a kind of band parallel connection damping turn-adjusting arc-extinguishing winding singlephase earth fault circuit diagram of the invention；
Fig. 2 is the schematic diagram that disturbing signal is extracted using the method that adjacent cycle subtracts each other；
Fig. 3 is the singlephase earth fault model with damping turn-adjusting arc-extinguishing winding in parallel；
Fig. 4 is a kind of band parallel connection damping turn-adjusting arc-extinguishing winding single-phase ground fault distance measuring method flow chart of the invention.
Specific embodiment
The present invention will be further described with embodiment with reference to the accompanying drawing:
Band parallel connection damping turn-adjusting arc-extinguishing winding according to the present invention is to be connected in parallel inductance and damping resistance, is such as schemed
Shown in 1.When the singlephase earth fault with damping turn-adjusting arc-extinguishing winding in parallel, with the concatenated anti-parallel thyristor of damping resistance
It is constantly in off state, in view of the controllability of electronic power switch, if controlling the thyristor turned off triggering and conducting in short-term at this time,
Be equivalent to and damping resistance put into operation in short-term, and then cause fault feeder voltage, electric current that slight perturbations occur therewith, by
Feeder line outlet end can calculate at a distance from fault point the detection of the disturbance and analysis.
Process object of the invention is " band damping turn-adjusting arc-extinguishing winding in parallel ", for engineering practicability, the present invention
The method that patent generates disturbance is simpler than method used in documents, does not need to carry out power electronic devices complicated control
System can meet the requirements the requirement in engineering.
The disturbance voltage current signal at route beginning is carried out fast Fourier using harmonic impedance measuring technique by the present invention
Analysis obtains system harmonic impedance data, is mathematically calculated according to the expression formula of system harmonic impedance with obtained data
To fault distance.
One, band damping turn-adjusting arc-extinguishing winding single-phase ground fault distance measuring method in parallel
Fig. 4 is a kind of band parallel connection damping turn-adjusting arc-extinguishing winding single-phase ground fault distance measuring method flow chart of the invention.
Band as shown in Figure 4 damping turn-adjusting arc-extinguishing winding single-phase ground fault distance measuring method in parallel, specifically includes:
Step 1: controlling anti-parallel thyristor triggering and conducting in short-term using microprocessor, and then generate disturbing signal；Institute
Stating disturbing signal includes disturbance voltage signal and current perturbation signal.
The present invention is by the control to power electronic devices, it can be achieved that the control of generation time and amplitude to disturbing signal
System, improving signal can identification.
Wherein, microprocessor can be single-chip microcontroller or programmable logic controller (PLC).
Step 2: extracting disturbing signal in faulty line outlet end.
The outlet end of faulty line i.e. the beginning of faulty line.
The method that adjacent cycle subtracts each other can be used in faulty line outlet end and extract disturbance voltage and current perturbation signal, i.e.,
Subtracted each other by the waveform containing disturbing signal and the normal waveform without containing disturbing signal, can will be superimposed upon on background waveform
Disturbance extracts, as shown in Figure 2.The method for extracting signal is substantially a kind of nonlinear filtering, it can will be each in background
Kind PERIODIC INTERFERENCE filters out, and then guarantees the accuracy that disturbance is extracted.
Step 3: Fourier transformation analysis being carried out to the disturbing signal of extraction, according to disturbance voltage and current perturbation in frequency domain
Interior linear relationship obtains the equivalent impedance number at different frequencies with damping turn-adjusting arc-extinguishing winding singlephase earth fault in parallel
According to.
Due to the disturbing signal of generation frequency content rich in, fault feeder can be obtained at multiple frequencies using it
Frequency domain characteristic, and then acquire distance of the fault point away from bus under multiple frequencies.
In order to guarantee the accuracy of data, the precision of fault distance calculating is improved, the present invention is also under different frequency
Equivalent impedance data carry out redundancy processing.
Preferably, the present invention carries out redundancy processing to the equivalent impedance data under different frequency using least square method.Benefit
It can be maximized with least square method and accurately handle data redundancy, improve the data accuracy of computing impedance.
The present invention can also carry out at redundancy the equivalent impedance data under different frequency using other existing methods
Reason.
Step 4: by impedance data equivalent under different frequency and the single-phase earthing event with damping turn-adjusting arc-extinguishing winding in parallel
The equivalent impedance expression formula simultaneous of barrier constructs equation group, and fault distance can be obtained in solve system of equation.
Specifically, the equivalent resistance of the singlephase earth fault with damping turn-adjusting arc-extinguishing winding in parallel in the step 4
The finding process of anti-expression formula are as follows:
Construct the singlephase earth fault model with damping turn-adjusting arc-extinguishing winding in parallel；
It is equal to the ratio of voltage and electric current further according to resistance, calculates the equivalent impedance expression formula of singlephase earth fault model.
The present invention is using the disturbance voltage and current perturbation measured, and the band damping turn-adjusting arc-extinguishing winding in parallel constructed
Singlephase earth fault model, can rapidly and accurately solve the equivalent impedance expression formula of singlephase earth fault model.
Singlephase earth fault model with damping turn-adjusting arc-extinguishing winding in parallel is as shown in Figure 3.
Wherein: M indicates faulty line beginning, and F indicates that point occurs for singlephase earth fault on route,Indicate failure phase beginning
Disturbance voltage,The current perturbation of failure phase is flowed through in expression,Indicate the disturbance voltage-to-ground of fault point F,Expression is flowed through
The current perturbation of ground resistance, LlineIndicate the unit inductance of route under fundamental frequency, XCIndicate single bit distribution electricity under fundamental frequency
Hold, RfIndicate that ground resistance, x indicate fault distance.
In Fig. 3, it is based on disturbance voltageAnd current perturbationLinear relationship in frequency domain obtains it at each time
Equivalent impedance under frequency.If Um(ω) and Im(ω) is respectively disturbance voltage, current signalWithThrough fast Flourier
Angular frequency is the component of ω after transformation, then equivalent impedance Z of the passive linear system under angular frequencym(ω) are as follows:
According to computation model equivalent impedance expression formula are as follows:
This method of the invention does not need the positive and negative zero sequence signal of measuring system, it is only necessary to extract the disturbance electricity of faulty line
Press signal and current perturbation signal, this can greatly speed up the acquisition speed of data in actual measurement, and do not need using
Iterative method calculates, so that fault distance-finding method is stringent to requirement of real-time, shortens and calculates the time, ensure that fault distance-finding method
Real-time, and the present invention is while obtaining data, only data preparation can need to be calculated fault distance.
Two, band damping turn-adjusting arc-extinguishing winding single-phase ground fault distance measuring system in parallel
A kind of band parallel connection of the invention damps turn-adjusting arc-extinguishing winding single-phase ground fault distance measuring system, comprising:
(1) microprocessor is connected with inverse parallel crystalline substance lock；The microprocessor is configured as: control anti-parallel thyristor
Triggering and conducting in short-term, and then generate disturbing signal；The disturbing signal includes disturbance voltage signal and current perturbation signal.
The present invention is by the control to power electronic devices, it can be achieved that the control of generation time and amplitude to disturbing signal
System, improving signal can identification.
Wherein, microprocessor can be single-chip microcontroller or programmable logic controller (PLC).
(2) signal pickup assembly is used to acquire the electric signal containing disturbing signal at faulty line beginning and is free of
There is the electric signal of disturbing signal and is sent to fault localization processor.
Signal pickup assembly includes current transformer and voltage transformer, the voltage letter being respectively intended on acquisition faulty line
Number and current signal.Wherein, the voltage signal on the faulty line of acquisition and current signal include the telecommunications containing disturbing signal
Number and the electric signal without containing disturbing signal.
(3) fault localization processor is configured as:
Disturbing signal is extracted in faulty line outlet end；Wherein it is possible to be disturbed using the method that adjacent cycle subtracts each other to extract
Dynamic signal；
Fourier transformation analysis is carried out to the disturbing signal of extraction, according to the line of disturbance voltage and current perturbation in frequency domain
Sexual intercourse obtains the equivalent impedance data at different frequencies with damping turn-adjusting arc-extinguishing winding singlephase earth fault in parallel；
By impedance data equivalent under different frequency with it is in parallel damping turn-adjusting arc-extinguishing winding singlephase earth fault etc.
Impedance expression simultaneous is imitated to construct equation group, fault distance can be obtained in solve system of equation.
In the specific implementation process, fault localization processor can be using CPU or the processor of other current versions come real
It is existing.
Specifically, the method that adjacent cycle subtracts each other can be used in faulty line outlet end and extracts disturbance voltage and current perturbation
Signal is subtracted each other by the waveform containing disturbing signal and the normal waveform without containing disturbing signal, can will be superimposed upon background
Disturbance on waveform extracts, as shown in Figure 2.The method for extracting signal is substantially a kind of nonlinear filtering, it can will be carried on the back
Various PERIODIC INTERFERENCEs in scape filter out, and then guarantee the accuracy that disturbance is extracted.
Due to the disturbing signal of generation frequency content rich in, fault feeder can be obtained at multiple frequencies using it
Frequency domain characteristic, and then acquire distance of the fault point away from bus under multiple frequencies.
In order to guarantee the accuracy of data, the precision of fault distance calculating is improved, the present invention is also under different frequency
Equivalent impedance data carry out redundancy processing.
Preferably, the present invention carries out redundancy processing to the equivalent impedance data under different frequency using least square method.Benefit
It can be maximized with least square method and accurately handle data redundancy, improve the data accuracy of computing impedance.
Singlephase earth fault model with damping turn-adjusting arc-extinguishing winding in parallel is as shown in Figure 3.
Wherein: M indicates faulty line beginning, and F indicates that point occurs for singlephase earth fault on route,Indicate failure phase beginning
Disturbance voltage,The current perturbation of failure phase is flowed through in expression,Indicate the disturbance voltage-to-ground of fault point F,Expression is flowed through
The current perturbation of ground resistance, LlineIndicate the unit inductance of route under fundamental frequency, XCIndicate single bit distribution electricity under fundamental frequency
Hold, RfIndicate that ground resistance, x indicate fault distance.
In Fig. 3, it is based on disturbance voltageAnd current perturbationLinear relationship in frequency domain obtains it at each time
Equivalent impedance under frequency.If Um(ω) and Im(ω) is respectively disturbance voltage, current signalWithThrough fast Flourier
Angular frequency is the component of ω after transformation, then equivalent impedance Z of the passive linear system under angular frequencym(ω) are as follows:
According to computation model equivalent impedance expression formula are as follows:
The present invention is using the disturbance voltage and current perturbation measured, and the band damping turn-adjusting arc-extinguishing winding in parallel constructed
Singlephase earth fault model, can rapidly and accurately solve the equivalent impedance expression formula of singlephase earth fault model.
Further, fault localization processor is also connected with display screen, and display screen is for showing fault distance.
Further, fault localization processor is also connected with server, and server is connected with remote monitoring terminal.Make in this way
The calculated fault distance of fault localization processor can also be obtained in real time by remote monitoring terminal by obtaining remote monitoring personnel.
The system of the invention does not need the positive and negative zero sequence signal of measuring system, it is only necessary to extract the disturbance electricity of faulty line
Press signal and current perturbation signal, this can greatly speed up the acquisition speed of data in actual measurement, and do not need using
Iterative method calculates, so that fault localization process is stringent to requirement of real-time, shortens and calculates the time, ensure that fault localization process
Real-time, and the present invention is while obtaining data, only data preparation can need to be calculated fault distance.
Above-mentioned, although the foregoing specific embodiments of the present invention is described with reference to the accompanying drawings, not protects model to the present invention
The limitation enclosed, those skilled in the art should understand that, based on the technical solutions of the present invention, those skilled in the art are not
Need to make the creative labor the various modifications or changes that can be made still within protection scope of the present invention.
Claims (10)
1. a kind of band parallel connection damps turn-adjusting arc-extinguishing winding single-phase ground fault distance measuring method, band damping turn-adjusting arc blowout wire in parallel
Circle is to be connected in parallel inductance and damping resistance, which is characterized in that when the single-phase earthing with damping turn-adjusting arc-extinguishing winding in parallel
When failure, it is constantly in off state with the concatenated anti-parallel thyristor of damping resistance, this method specifically includes:
Step 1: controlling anti-parallel thyristor triggering and conducting in short-term using microprocessor, and then generate disturbing signal；It is described to disturb
Dynamic signal includes disturbance voltage signal and current perturbation signal；
Step 2: extracting disturbing signal in faulty line outlet end；
Step 3: Fourier transformation analysis being carried out to the disturbing signal of extraction, according to disturbance voltage and current perturbation in frequency domain
Linear relationship obtains the equivalent impedance data at different frequencies with damping turn-adjusting arc-extinguishing winding singlephase earth fault in parallel；
Step 4: by impedance data equivalent under different frequency and the singlephase earth fault with damping turn-adjusting arc-extinguishing winding in parallel
Equivalent impedance expression formula simultaneous constructs equation group, does not need to calculate using iterative method, solve system of equation can be obtained failure away from
From.
2. a kind of band parallel connection as described in claim 1 damps turn-adjusting arc-extinguishing winding single-phase ground fault distance measuring method, special
Sign is, the equivalent impedance expression formula of the singlephase earth fault with damping turn-adjusting arc-extinguishing winding in parallel in the step 4
Finding process are as follows:
Construct the singlephase earth fault model with damping turn-adjusting arc-extinguishing winding in parallel；
It is equal to the ratio of voltage and electric current further according to resistance, calculates the equivalent impedance expression formula of singlephase earth fault model.
3. a kind of band parallel connection as described in claim 1 damps turn-adjusting arc-extinguishing winding single-phase ground fault distance measuring method, special
Sign is that this method further includes carrying out redundancy processing to the equivalent impedance data under different frequency.
4. a kind of band parallel connection as described in claim 1 damps turn-adjusting arc-extinguishing winding single-phase ground fault distance measuring method, special
Sign is, extracts disturbing signal using the method that adjacent cycle subtracts each other in faulty line outlet end.
5. a kind of damp turn-adjusting arc-extinguishing winding single-phase ground fault distance measuring using the described in any item band parallel connections of claim 1-4
The range-measurement system of method, band damping turn-adjusting arc-extinguishing winding in parallel is to be connected in parallel inductance and damping resistance, which is characterized in that
When the singlephase earth fault with damping turn-adjusting arc-extinguishing winding in parallel, locate always with the concatenated anti-parallel thyristor of damping resistance
In off state, which includes:
Microprocessor is connected with inverse parallel crystalline substance lock；The microprocessor is configured as: control anti-parallel thyristor triggers in short-term
Conducting, and then generate disturbing signal；The disturbing signal includes disturbance voltage signal and current perturbation signal；
Signal pickup assembly is used to acquire the electric signal containing disturbing signal at faulty line beginning and without containing disturbance letter
Number electric signal and be sent to fault localization processor；
Fault localization processor, is configured as:
Disturbing signal is extracted using the method that adjacent cycle subtracts each other；
Fourier transformation analysis is carried out to the disturbing signal of extraction, according to the linear pass of disturbance voltage and current perturbation in frequency domain
System obtains the equivalent impedance data at different frequencies with damping turn-adjusting arc-extinguishing winding singlephase earth fault in parallel；
By the equivalent resistance of impedance data equivalent under different frequency and the singlephase earth fault with damping turn-adjusting arc-extinguishing winding in parallel
Anti- expression formula simultaneous constructs equation group, and fault distance can be obtained in solve system of equation.
6. range-measurement system as claimed in claim 5, which is characterized in that the fault localization processor is also configured to
Construct the singlephase earth fault model with damping turn-adjusting arc-extinguishing winding in parallel；
It is equal to the ratio of voltage and electric current further according to resistance, calculates the equivalent impedance expression formula of singlephase earth fault model.
7. range-measurement system as claimed in claim 5, which is characterized in that the fault localization processor is also configured to not
Equivalent impedance data under same frequency carry out redundancy processing.
8. range-measurement system as claimed in claim 5, which is characterized in that the fault localization processor is also configured in event
Barrier line outlet end disturbing signal is extracted using the method that adjacent cycle subtracts each other.
9. range-measurement system as claimed in claim 5, which is characterized in that the fault localization processor is also connected with display screen,
The display screen is for showing fault distance.
10. range-measurement system as claimed in claim 5, which is characterized in that the fault localization processor is also connected with server,
The server is connected with remote monitoring terminal.
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| CN107907793A (en) * | 2017-11-14 | 2018-04-13 | 云南电网有限责任公司电力科学研究院 | One-phase earthing failure in electric distribution network detecting system and method based on two-way automated communications |
| CN109387743B (en) * | 2018-11-21 | 2021-05-14 | 国网辽宁省电力有限公司朝阳供电公司 | Single-ended ranging method using neutral point switching and traveling wave injection signal generated thereby |
| CN111830364A (en) * | 2020-06-04 | 2020-10-27 | 国网冀北电力有限公司经济技术研究院 | Calculation method for calculating transient interference signals at two ends of secondary cable of transformer substation |
| CN116482488B (en) * | 2023-06-16 | 2023-09-22 | 国网山东省电力公司东营供电公司 | Power distribution network ground fault distance measurement method and system based on capacitive transient |
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| CN102778636B (en) * | 2012-07-26 | 2016-03-02 | 北京飞举电气有限公司 | Method for locating single-phase ground fault and equipment |
| CN103454559B (en) * | 2013-09-02 | 2015-10-28 | 国家电网公司 | A kind of one-phase earthing failure in electric distribution network Section Location and locating device |
| CN104251959B (en) * | 2014-09-18 | 2017-03-08 | 云南电网公司电力科学研究院 | A kind of system for detecting and positioning one-phase earthing failure in electric distribution network |
| CN104820169B (en) * | 2015-05-14 | 2018-01-19 | 国家电网公司 | A kind of neutral by arc extinction coil grounding system single-phase earth fault localization method |
| CN204595147U (en) * | 2015-05-18 | 2015-08-26 | 国网辽宁省电力有限公司丹东供电公司 | Turn-adjusting arc-extinguishing winding simulation system |
| CN104793109B (en) * | 2015-05-18 | 2017-09-19 | 国网辽宁省电力有限公司丹东供电公司 | Turn-adjusting arc-extinguishing winding simulation system and method |
| CN106019082B (en) * | 2016-05-26 | 2018-08-07 | 上海电力学院 | A kind of distribution network fault line selection method containing DG based on transient zero-sequence current |
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2016
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