CN106646136A - Method and system for locating single-phase earth fault of parallel damping turn-adjustable type arc-extinction coil - Google Patents
Method and system for locating single-phase earth fault of parallel damping turn-adjustable type arc-extinction coil Download PDFInfo
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- CN106646136A CN106646136A CN201611234590.XA CN201611234590A CN106646136A CN 106646136 A CN106646136 A CN 106646136A CN 201611234590 A CN201611234590 A CN 201611234590A CN 106646136 A CN106646136 A CN 106646136A
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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 method and a system for locating a single-phase earth fault of a parallel damping turn-adjustable type arc-extinction coil. The method comprises the following steps: controlling the short-term trigger conduction of an anti-parallel thyristor by using a microprocessor, thereby generating a disturbing signal which includes a disturbing voltage signal and a disturbing current signal; extracting the disturbing signal at an outlet end of a fault circuit; performing Fourier transform analysis on the extracted disturbing signal; acquiring equivalent impedance data under different frequencies of the single-phase earth fault of the parallel damping turn-adjustable type arc-extinction coil according to a linear relation of the disturbing voltage and the disturbing current in a frequency domain; constructing an equation set by utilizing the equivalent impedance data under different frequencies and an equivalent impedance expression of the single-phase earth fault of the parallel damping turn-adjustable type arc-extinction coil; solving the equation set, thereby acquiring a fault distance.
Description
Technical field
The invention belongs to field of fault detection, more particularly to a kind of damping turn-adjusting arc-extinguishing winding single-phase earthing event in parallel of band
Barrier distance-finding method and system.
Background technology
Because power distribution network is the end link to sharing of load electric energy, complex structure, branch is numerous, therefore is susceptible to connect
Earth fault especially singlephase earth fault.If processed not in time after there is singlephase earth fault, may initiating failure expansion
Dissipate, the operation to electrical network works the mischief.Therefore, fast and accurately FLT is to distribution safe operation and ensures to supply
Electric reliability is significant.
Fault localization refers to fault distance is directly calculated using the electric information on faulty line mainly have impedance
Method and the class method of traveling wave method 2.Voltage when impedance method mainly utilizes failure on circuit, current information calculates line impedance, and then
Fault distance is calculated, impedance method application is simple, and cost is cheap, but is easily affected by factors such as earth resistance and loads.OK
Ripple method mainly uses the transient state travelling wave that produces when breaking down and reaches time of test point to calculate fault distance.In view of matching somebody with somebody
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 the precision to finding range is produced
The certain impact of life.
The widely used Jing grounding through arc method of operation of China's middle voltage distribution networks neutral point.Recently as capacity, pressure
With gradually stepping up for reliability, electronic power switch device because its action it is swiftness start to be applied in resonant earthed system
The regulation of arc suppression coil, the such as switching of " turn-adjusting " arc suppression coil damped resistor, the throwing of " capacitor tuning type " arc suppression coil compensation electric capacity
Cut.
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 relation row between voltage x current, fault distance is calculated according to iterative method.The method causes actual measurement
Middle data acquisition amount is more and speed is slow, because existing single-phase ground fault distance measuring method calculates fault distance using iterative method,
The substantial amounts of time is wasted, the real-time of causing trouble distance-finding method is not enough.
The content of the invention
In order to solve the shortcoming of prior art, the first object of the present invention is to provide a kind of band damping turn-adjusting extinguishing arc in parallel
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
During the singlephase earth fault of arc suppression coil, the anti-parallel thyristor connected with damping resistance is constantly in off state.
One kind band of present invention damping turn-adjusting arc-extinguishing winding single-phase ground fault distance measuring method in parallel, specifically includes：
Step 1：Anti-parallel thyristor triggering and conducting in short-term is controlled using microprocessor, and then produces disturbing signal；Institute
Disturbing signal is stated including disturbance voltage signal and current perturbation signal；
Step 2：Disturbing signal is extracted in the faulty line port of export；
Step 3：Disturbing signal to extracting carries out Fourier transformation analysis, according to disturbance voltage and current perturbation in frequency domain
Interior linear relationship, obtains the equiva lent impedance number at different frequencies with damping turn-adjusting arc-extinguishing winding singlephase earth fault in parallel
According to；
Step 4：By equivalent impedance data under different frequency and the single-phase earthing event with damping turn-adjusting arc-extinguishing winding in parallel
Building equation group, solving equation group is obtained fault distance to the equiva lent impedance expression formula simultaneous of barrier.
The method of the present invention only needs to extract the disturbance voltage signal and current perturbation signal of faulty line, and this is in reality
The picking rate of data can be greatly speeded up in measurement, and need not be calculated using iterative method so that fault distance-finding method pair
Requirement of real-time is strict, shortens the calculating time, it is ensured that the real-time of fault distance-finding method, and the present invention is obtaining data
While, only data preparation can need to be calculated fault distance.
The equiva lent impedance expression formula of the singlephase earth fault of the band damping turn-adjusting arc-extinguishing winding in parallel in the step 4
Process of asking for be：
Build the singlephase earth fault model with damping turn-adjusting arc-extinguishing winding in parallel；
The ratio of voltage and electric current is equal to further according to resistance, the equiva lent impedance expression formula of singlephase earth fault model is calculated.
The present invention is using the disturbance voltage and current perturbation for measuring, and the band parallel connection damping turn-adjusting arc-extinguishing winding for building
Singlephase earth fault model, can rapidly and accurately solve the equiva lent impedance expression formula of singlephase earth fault model.
The method also includes carrying out redundancy process to the equiva lent impedance data under different frequency.
Redundancy process is carried out to the equiva lent impedance data under different frequency, it is ensured that the accuracy of data, improve failure
The precision that distance is calculated.
Redundancy process is carried out to the equiva lent impedance data under different frequency using least square method.Using least square method energy
It is enough to maximize processing data redundancy exactly, improve the data accuracy of computing impedance.
Further, the method subtracted each other using adjacent cycle in the faulty line port of export is extracting disturbing signal.
In the faulty line port of export method that adjacent cycle subtracts each other can be adopted to extract disturbance voltage and current perturbation signal, i.e.,
Subtracted each other with the normal waveform for not containing disturbing signal by the waveform containing disturbing signal, you can will be superimposed upon on background waveform
Disturbance is extracted.The method for extracting signal is substantially a kind of nonlinear filtering, and it can do the various periodicity in background
Disturb and filter, and then ensure the accuracy that disturbance is extracted.
The second object of the present invention is to provide a kind of band damping turn-adjusting arc-extinguishing winding single-phase ground fault distance measuring system in parallel
System.
One kind band of present invention damping turn-adjusting arc-extinguishing winding single-phase ground fault distance measuring system in parallel, 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 of band damping turn-adjusting arc-extinguishing winding in parallel
During barrier, the anti-parallel thyristor connected with damping resistance is constantly in off state, and the system includes：
Microprocessor, it is connected with inverse parallel crystalline substance lock；The microprocessor is configured to：Control anti-parallel thyristor is in short-term
Triggering and conducting, and then produce disturbing signal；The disturbing signal includes disturbance voltage signal and current perturbation signal；
Signal pickup assembly, it is used to gathering the electric signal containing disturbing signal at faulty line top and without thanksing for your hospitality
The electric signal of dynamic signal is simultaneously sent to fault localization processor；
Fault localization processor, it is configured to：
The method subtracted each other using adjacent cycle is extracting disturbing signal；
Disturbing signal to extracting carries out Fourier transformation analysis, according to the line of disturbance voltage and current perturbation in frequency domain
Sexual intercourse, obtains the equiva lent impedance data at different frequencies with damping turn-adjusting arc-extinguishing winding singlephase earth fault in parallel；
By equivalent impedance data under different frequency with it is in parallel damping turn-adjusting arc-extinguishing winding singlephase earth fault etc.
Imitate impedance expression simultaneous to build equation group, solving equation group is obtained fault distance.
The system of the present 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
Pressure signal and current perturbation signal, this can greatly speed up the picking rate of data in actually measurement, and need not use
Iterative method is calculated so that fault localization process is strict to requirement of real-time, shortens the calculating time, it is ensured that fault localization process
Real-time, and the present invention is while data are obtained, only need to data preparation can calculate fault distance.
Further, the fault localization processor, is additionally configured to：
Build the singlephase earth fault model with damping turn-adjusting arc-extinguishing winding in parallel；
The ratio of voltage and electric current is equal to further according to resistance, the equiva lent impedance expression formula of singlephase earth fault model is calculated.
The present invention is using the disturbance voltage and current perturbation for measuring, and the band parallel connection damping turn-adjusting arc-extinguishing winding for building
Singlephase earth fault model, can rapidly and accurately solve the equiva lent impedance expression formula of singlephase earth fault model.
Further, the fault localization processor, is additionally configured to：Equiva lent impedance data under different frequency are carried out
Redundancy process.
Redundancy process is carried out to the equiva lent impedance data under different frequency, it is ensured that the accuracy of data, improve failure
The precision that distance is calculated.
Further, the fault localization processor, is additionally configured to：Using least square method under different frequency etc.
Effect impedance data carries out redundancy process.Processing data redundancy exactly can be maximized using least square method, is improved and is calculated resistance
Anti- data accuracy.
Further, the fault localization processor, is additionally configured to：Adjacent cycle phase is adopted in the faulty line port of export
The method for subtracting is extracting disturbing signal.
In the faulty line port of export method that adjacent cycle subtracts each other can be adopted to extract disturbance voltage and current perturbation signal, i.e.,
Subtracted each other with the normal waveform for not containing disturbing signal by the waveform containing disturbing signal, you can will be superimposed upon on background waveform
Disturbance is extracted.The method for extracting signal is substantially a kind of nonlinear filtering, and it can do the various periodicity in background
Disturb and filter, and then ensure the accuracy that disturbance is extracted.
Further, the fault localization processor is also connected with display screen, and the display screen is used to show fault distance.
Further, the fault localization processor is also connected with server, the server and remote monitoring terminal phase
Even.Remote monitoring personnel is so caused also can in real time to obtain the event that fault localization processor is calculated by remote monitoring terminal
Barrier distance.
Beneficial effects of the present invention are：
The present invention do not need measuring system positive and negative zero sequence signal, it is only necessary to extract faulty line disturbance voltage signal and
Current perturbation signal, this can greatly speed up the picking rate of data in actually measurement, and need not use iterative method meter
Calculate so that fault distance-finding method is strict to requirement of real-time, shortens the calculating time, it is ensured that fault distance-finding method it is real-time
Property, and the present invention is while data are obtained, and only data preparation need to can be calculated into fault distance.
Description of the drawings
Fig. 1 is one kind band damping turn-adjusting arc-extinguishing winding singlephase earth fault circuit diagram in parallel of the present invention；
Fig. 2 is the method subtracted each other using adjacent cycle extracting the schematic diagram of disturbing signal；
Fig. 3 is the singlephase earth fault model with damping turn-adjusting arc-extinguishing winding in parallel；
Fig. 4 is one kind band damping turn-adjusting arc-extinguishing winding single-phase ground fault distance measuring method flow chart in parallel of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawings the present invention will be further described with embodiment：
Band involved in the present invention damping turn-adjusting arc-extinguishing winding in parallel is such as schemed to be connected in parallel inductance and damping resistance
Shown in 1.When the singlephase earth fault of band damping turn-adjusting arc-extinguishing winding in parallel, the anti-parallel thyristor connected with damping resistance
Off state is constantly in, in view of the controllability of electronic power switch, if the IGCT of now control shut-off triggering and conducting in short-term,
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
Detection and analysis of the feeder line port of export to the disturbance can calculate the distance of trouble point.
The process object of the present invention is " band damping turn-adjusting arc-extinguishing winding in parallel ", from for engineering practicability, the present invention
The method that patent produces disturbance is simpler than the method used by documents, it is not necessary to the control of complexity is carried out to power electronic devices
System can meet the requirement required in engineering.
The disturbance voltage current signal at circuit top is carried out fast Fourier by the present invention using harmonic impedance e measurement technology
Analysis obtains system harmonic impedance data, is mathematically calculated according to expression formula and the data for obtaining of system harmonic impedance
To fault distance.
First, band damping turn-adjusting arc-extinguishing winding single-phase ground fault distance measuring method in parallel
Fig. 4 is one kind band damping turn-adjusting arc-extinguishing winding single-phase ground fault distance measuring method flow chart in parallel of the present 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：Anti-parallel thyristor triggering and conducting in short-term is controlled using microprocessor, and then produces disturbing signal；Institute
Disturbing signal is stated including disturbance voltage signal and current perturbation signal.
The present invention is capable of achieving the generation time to disturbing signal and the control of amplitude by the control to power electronic devices
System, improve signal can identification.
Wherein, microprocessor can be single-chip microcomputer or programmable logic controller (PLC).
Step 2：Disturbing signal is extracted in the faulty line port of export.
The port of export of faulty line i.e. the top of faulty line.
In the faulty line port of export method that adjacent cycle subtracts each other can be adopted to extract disturbance voltage and current perturbation signal, i.e.,
Subtracted each other with the normal waveform for not containing disturbing signal by the waveform containing disturbing signal, you can will be superimposed upon on background waveform
Disturbance is extracted, as shown in Figure 2.The method for extracting signal is substantially a kind of nonlinear filtering, and it can will be each in background
Plant PERIODIC INTERFERENCE to filter, and then ensure the accuracy that disturbance is extracted.
Step 3：Disturbing signal to extracting carries out Fourier transformation analysis, according to disturbance voltage and current perturbation in frequency domain
Interior linear relationship, obtains the equiva lent impedance number at different frequencies with damping turn-adjusting arc-extinguishing winding singlephase earth fault in parallel
According to.
Because the disturbing signal for producing contains abundant frequency content, fault feeder is obtained at multiple frequencies using it
Frequency domain characteristic, and then try to achieve distance of the trouble point away from bus under multiple frequencies.
In order to ensure the accuracy of data, the precision of fault distance calculating is improve, the present invention is also under different frequency
Equiva lent impedance data carry out redundancy process.
Preferably, the present invention carries out redundancy process using least square method to the equiva lent impedance data under different frequency.Profit
Processing data redundancy exactly can be maximized with least square method, the data accuracy of computing impedance is improved.
The present invention can also be carried out at redundancy using other existing methods to the equiva lent impedance data under different frequency
Reason.
Step 4：By equivalent impedance data under different frequency and the single-phase earthing event with damping turn-adjusting arc-extinguishing winding in parallel
Building equation group, solving equation group is obtained fault distance to the equiva lent impedance expression formula simultaneous of barrier.
The equivalent resistance of the singlephase earth fault of the damping turn-adjusting arc-extinguishing winding in parallel of band specifically, in the step 4
The process of asking for of anti-expression formula is：
Build the singlephase earth fault model with damping turn-adjusting arc-extinguishing winding in parallel；
The ratio of voltage and electric current is equal to further according to resistance, the equiva lent impedance expression formula of singlephase earth fault model is calculated.
The present invention is using the disturbance voltage and current perturbation for measuring, and the band parallel connection damping turn-adjusting arc-extinguishing winding for building
Singlephase earth fault model, can rapidly and accurately solve the equiva lent 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 represents faulty line top, and F represents that singlephase earth fault occurs point on circuit,Represent failure phase top
Disturbance voltage,The current perturbation of failure phase is flow through in expression,The disturbance voltage-to-ground of trouble point F is represented,Expression is flow through and is connect
The current perturbation of ground resistance, LlineRepresent the unit inductance of circuit under fundamental frequency, XCRepresent fundamental frequency place an order bit distribution electricity
Hold, RfEarth resistance is represented, x represents fault distance.
In figure 3, based on disturbance voltageAnd current perturbationLinear relationship in frequency domain obtains it at each time
Equiva lent impedance under frequency.If Um(ω) and Im(ω) disturbance voltage, current signal are respectivelyWithJing fast Flouriers
Angular frequency is the component of ω after conversion, then equiva lent impedance Z of the passive linear system under angular frequencym(ω) it is：
Understand that equiva lent impedance expression formula is according to computation model：
The method of the present 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
Pressure signal and current perturbation signal, this can greatly speed up the picking rate of data in actually measurement, and need not use
Iterative method is calculated so that fault distance-finding method is strict to requirement of real-time, shortens the calculating time, it is ensured that fault distance-finding method
Real-time, and the present invention is while data are obtained, only need to data preparation can calculate fault distance.
2nd, band damping turn-adjusting arc-extinguishing winding single-phase ground fault distance measuring system in parallel
One kind band of present invention damping turn-adjusting arc-extinguishing winding single-phase ground fault distance measuring system in parallel, including：
(1) microprocessor, it is connected with inverse parallel crystalline substance lock；The microprocessor is configured to：Control anti-parallel thyristor
The disturbing signal of triggering and conducting, and then generation in short-term；The disturbing signal includes disturbance voltage signal and current perturbation signal.
The present invention is capable of achieving the generation time to disturbing signal and the control of amplitude by the control to power electronic devices
System, improve signal can identification.
Wherein, microprocessor can be single-chip microcomputer or programmable logic controller (PLC).
(2) signal pickup assembly, it is used to gather the electric signal containing disturbing signal at faulty line top and does not contain
There is the electric signal of disturbing signal and be sent to fault localization processor.
Signal pickup assembly includes current transformer and voltage transformer, is respectively intended to gather the voltage letter on faulty line
Number and current signal.Wherein, the voltage signal and current signal on the faulty line of collection includes the telecommunications containing disturbing signal
Number and do not contain the electric signal of disturbing signal.
(3) fault localization processor, it is configured to：
Disturbing signal is extracted in the faulty line port of export；Wherein it is possible to the method subtracted each other using adjacent cycle is disturbed to extract
Dynamic signal；
Disturbing signal to extracting carries out Fourier transformation analysis, according to the line of disturbance voltage and current perturbation in frequency domain
Sexual intercourse, obtains the equiva lent impedance data at different frequencies with damping turn-adjusting arc-extinguishing winding singlephase earth fault in parallel；
By equivalent impedance data under different frequency with it is in parallel damping turn-adjusting arc-extinguishing winding singlephase earth fault etc.
Imitate impedance expression simultaneous to build equation group, solving equation group is obtained fault distance.
In specific implementation process, fault localization processor can be using CPU or the processor of other current versions come real
It is existing.
Specifically, in the faulty line port of export method that adjacent cycle subtracts each other can be adopted to extract disturbance voltage and current perturbation
Signal, i.e., subtracted each other by the waveform containing disturbing signal with the normal waveform for not containing disturbing signal, you can will be superimposed upon background
Disturbance on waveform is extracted, as shown in Figure 2.The method for extracting signal is substantially a kind of nonlinear filtering, and it will can be carried on the back
Various PERIODIC INTERFERENCEs in scape are filtered, and then ensure the accuracy that disturbance is extracted.
Because the disturbing signal for producing contains abundant frequency content, fault feeder is obtained at multiple frequencies using it
Frequency domain characteristic, and then try to achieve distance of the trouble point away from bus under multiple frequencies.
In order to ensure the accuracy of data, the precision of fault distance calculating is improve, the present invention is also under different frequency
Equiva lent impedance data carry out redundancy process.
Preferably, the present invention carries out redundancy process using least square method to the equiva lent impedance data under different frequency.Profit
Processing data redundancy exactly can be maximized with least square method, the data accuracy of computing impedance is improved.
Singlephase earth fault model with damping turn-adjusting arc-extinguishing winding in parallel is as shown in Figure 3.
Wherein：M represents faulty line top, and F represents that singlephase earth fault occurs point on circuit,Represent failure phase top
Disturbance voltage,The current perturbation of failure phase is flow through in expression,The disturbance voltage-to-ground of trouble point F is represented,Expression is flow through and is connect
The current perturbation of ground resistance, LlineRepresent the unit inductance of circuit under fundamental frequency, XCRepresent fundamental frequency place an order bit distribution electricity
Hold, RfEarth resistance is represented, x represents fault distance.
In figure 3, based on disturbance voltageAnd current perturbationLinear relationship in frequency domain obtains it at each time
Equiva lent impedance under frequency.If Um(ω) and Im(ω) disturbance voltage, current signal are respectivelyWithJing fast Flouriers
Angular frequency is the component of ω after conversion, then equiva lent impedance Z of the passive linear system under angular frequencym(ω) it is：
Understand that equiva lent impedance expression formula is according to computation model：
The present invention is using the disturbance voltage and current perturbation for measuring, and the band parallel connection damping turn-adjusting arc-extinguishing winding for building
Singlephase earth fault model, can rapidly and accurately solve the equiva lent impedance expression formula of singlephase earth fault model.
Further, fault localization processor is also connected with display screen, and display screen is used to show fault distance.
Further, fault localization processor is also connected with server, and server is connected with remote monitoring terminal.So make
Obtain remote monitoring personnel also can in real time obtain the fault distance that fault localization processor is calculated by remote monitoring terminal.
The system of the present 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
Pressure signal and current perturbation signal, this can greatly speed up the picking rate of data in actually measurement, and need not use
Iterative method is calculated so that fault localization process is strict to requirement of real-time, shortens the calculating time, it is ensured that fault localization process
Real-time, and the present invention is while data are obtained, only need to data preparation can calculate fault distance.
Although the above-mentioned accompanying drawing that combines is described to the specific embodiment of the present invention, not to present invention protection model
The restriction enclosed, one of ordinary skill in the art should be understood that on the basis of technical scheme those skilled in the art are not
Need the various modifications made by paying creative work or deformation still within protection scope of the present invention.
Claims (10)
1. a kind of band is in parallel damps turn-adjusting arc-extinguishing winding single-phase ground fault distance measuring method, band damping turn-adjusting arc blowout wire in parallel
Enclose to be connected in parallel inductance and damping resistance, it is characterised in that when the single-phase earthing of band damping turn-adjusting arc-extinguishing winding in parallel
During failure, the anti-parallel thyristor connected with damping resistance is constantly in off state, and the method is specifically included：
Step 1：Anti-parallel thyristor triggering and conducting in short-term is controlled using microprocessor, and then produces disturbing signal；It is described to disturb
Dynamic signal includes disturbance voltage signal and current perturbation signal；
Step 2：Disturbing signal is extracted in the faulty line port of export；
Step 3：Disturbing signal to extracting carries out Fourier transformation analysis, according to disturbance voltage and current perturbation in frequency domain
Linear relationship, obtains the equiva lent impedance data at different frequencies with damping turn-adjusting arc-extinguishing winding singlephase earth fault in parallel；
Step 4：By equivalent impedance data under different frequency and the singlephase earth fault with damping turn-adjusting arc-extinguishing winding in parallel
Building equation group, solving equation group is obtained fault distance to equiva lent impedance expression formula simultaneous.
2. a kind of band as claimed in claim 1 is in parallel damps turn-adjusting arc-extinguishing winding single-phase ground fault distance measuring method, and it is special
Levy and be, the equiva lent impedance expression formula of the singlephase earth fault of the damping turn-adjusting arc-extinguishing winding in parallel of the band in the step 4
Process of asking for be：
Build the singlephase earth fault model with damping turn-adjusting arc-extinguishing winding in parallel；
The ratio of voltage and electric current is equal to further according to resistance, the equiva lent impedance expression formula of singlephase earth fault model is calculated.
3. a kind of band as claimed in claim 1 is in parallel damps turn-adjusting arc-extinguishing winding single-phase ground fault distance measuring method, and it is special
Levy and be, the method also includes carrying out redundancy process to the equiva lent impedance data under different frequency.
4. a kind of band as claimed in claim 1 is in parallel damps turn-adjusting arc-extinguishing winding single-phase ground fault distance measuring method, and it is special
Levy and be, the method subtracted each other using adjacent cycle in the faulty line port of export is extracting disturbing signal.
5. a kind of band is in parallel damps turn-adjusting arc-extinguishing winding single-phase ground fault distance measuring system, band damping turn-adjusting arc blowout wire in parallel
Enclose to be connected in parallel inductance and damping resistance, it is characterised in that when the single-phase earthing of band damping turn-adjusting arc-extinguishing winding in parallel
During failure, the anti-parallel thyristor connected with damping resistance is constantly in off state, and the system includes：
Microprocessor, it is connected with inverse parallel crystalline substance lock；The microprocessor is configured to：Control anti-parallel thyristor is triggered in short-term
Conducting, and then produce disturbing signal；The disturbing signal includes disturbance voltage signal and current perturbation signal；
Signal pickup assembly, it is used to gather the electric signal containing disturbing signal at faulty line top and not contain disturbance to believe
Number electric signal and be sent to fault localization processor；
Fault localization processor, it is configured to：
The method subtracted each other using adjacent cycle is extracting disturbing signal；
Disturbing signal to extracting carries out Fourier transformation analysis, the linear pass according to disturbance voltage and current perturbation in frequency domain
System, obtains the equiva lent impedance data at different frequencies with damping turn-adjusting arc-extinguishing winding singlephase earth fault in parallel；
By equivalent impedance data under different frequency and the equivalent resistance with the singlephase earth fault for damping turn-adjusting arc-extinguishing winding in parallel
Building equation group, solving equation group is obtained fault distance to anti-expression formula simultaneous.
6. a kind of band as claimed in claim 5 is in parallel damps turn-adjusting arc-extinguishing winding single-phase ground fault distance measuring system, and it is special
Levy and be, the fault localization processor is additionally configured to：
Build the singlephase earth fault model with damping turn-adjusting arc-extinguishing winding in parallel；
The ratio of voltage and electric current is equal to further according to resistance, the equiva lent impedance expression formula of singlephase earth fault model is calculated.
7. a kind of band as claimed in claim 5 is in parallel damps turn-adjusting arc-extinguishing winding single-phase ground fault distance measuring system, and it is special
Levy and be, the fault localization processor is additionally configured to：Redundancy process is carried out to the equiva lent impedance data under different frequency.
8. a kind of band as claimed in claim 5 is in parallel damps turn-adjusting arc-extinguishing winding single-phase ground fault distance measuring system, and it is special
Levy and be, the fault localization processor is additionally configured to：The method subtracted each other using adjacent cycle in the faulty line port of export come
Extract disturbing signal.
9. a kind of band as claimed in claim 5 is in parallel damps turn-adjusting arc-extinguishing winding single-phase ground fault distance measuring system, and it is special
Levy and be, the fault localization processor is also connected with display screen, the display screen is used to show fault distance.
10. a kind of band as claimed in claim 5 is in parallel damps turn-adjusting arc-extinguishing winding single-phase ground fault distance measuring system, and it is special
Levy and be, the fault localization processor is also connected with server, and the server is connected with remote monitoring terminal.
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| CN201611234590.XA CN106646136B (en) | 2016-12-28 | 2016-12-28 | Band damping turn-adjusting arc-extinguishing winding single-phase ground fault distance measuring method in parallel and system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN109387743A (en) * | 2018-11-21 | 2019-02-26 | 国网辽宁省电力有限公司朝阳供电公司 | Switch and thus generate the method for single end distance measurement of traveling wave Injection Signal using neutral point |
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| 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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