CN106771877A - The determination method and apparatus of the position of failure point of system with non effectively earth ed neutral - Google Patents
The determination method and apparatus of the position of failure point of system with non effectively earth ed neutral Download PDFInfo
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- CN106771877A CN106771877A CN201710017373.3A CN201710017373A CN106771877A CN 106771877 A CN106771877 A CN 106771877A CN 201710017373 A CN201710017373 A CN 201710017373A CN 106771877 A CN106771877 A CN 106771877A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
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- 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
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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Abstract
The present invention proposes a kind of determination method and apparatus of the position of failure point of system with non effectively earth ed neutral, wherein, the determination method includes：Determine whether the circuit in system with non effectively earth ed neutral occurs singlephase earth fault；If circuit occur singlephase earth fault, the breaker of control circuit trip first after reclosing；If breaker unsuccessful reclosing, it is determined that circuit occurs permanent fault, if breaker reclosing success, it is determined that circuit occurs transient fault；In the case of it is determined that circuit occurs permanent fault, control breaker trips again；Obtain the back wave arrival time of reclosure time and the breaker Single-phase Ground Connection Failure of circuit after tripping again of breaker；According to reclosure time and back wave arrival time, the position of the Single-phase Ground Connection Failure of circuit is determined.By technical scheme, it may be determined that be out of order type, and when fault type is permanent fault, can also exactly detect abort situation.
Description
Technical field
The present invention relates to technical field of power systems, in particular to a kind of event of system with non effectively earth ed neutral
Barrier point method for determining position and a kind of determining device of the position of failure point of system with non effectively earth ed neutral.
Background technology
At present, system with non effectively earth ed neutral is the principal mode of domestic distribution system, and this system occurs single-phase connecing
During ground, line voltage is constant, the reduction of Earth Phase voltage, and ungrounded phase voltage is raised, simultaneously because system can only be by direct-to-ground capacitance
Loop is constituted, direct-to-ground capacitance capacitive reactance is very big, and causing trouble electric current is very small, extreme difficulties are brought to protection and range finding.
When system with non effectively earth ed neutral occurs singlephase earth fault, the normal power supply to user is not interfered with, no
Safe operation process to system constitutes directly threat, therefore it is single-phase also to allow distribution system to occur in the operating standard of China
2 hours can be continued to run with after earth fault.It is domestic at present that single-phase earthing event occurs for system with non effectively earth ed neutral
The main flow processing scheme of barrier is to carry out failure line selection, then provides alarm, without being tripped, then by artificially tripping and overlapping
Lock excludes transient fault.But, the singlephase earth fault major part that scene occurs all is transient fault, if protecting
Shield, be able to can fix a breakdown automatically by tripping operation and reclosing；Secondly, this malfunction long-term existence may cause ground connection
Electric arc continuous high temperature triggers the insulation permanent damage of wire, becomes permanent fault, rather than ground connection phase voltage is raised and accelerated absolutely
Edge is aging, it is possible to cause singlephase earth fault to develop into phase-to phase fault.
When there is permanent fault, it is necessary in fault location descendant be therefore the fault location on site fault clearing
The degree of accuracy is just extremely important.Bottleneck of the system with non effectively earth ed neutral in terms of range finding, main reason is that distribution system
The earthing mode of labyrinth and neutral point.First, distribution line power supply distance is short, high to range accuracy requirement；Secondly, match somebody with somebody
Electric system is generally radial structure, and lines branch is more, the special circumstances such as also there is built on stilts-cable mixing Transmission Mode, do not replace,
Design feature specific to these distribution lines also increases range finding difficulty；Finally, system with non effectively earth ed neutral is occurring
After the singlephase earth fault 70%-80% of road total failare (the line is busy), because not constituting short-circuit loop, fault current is very small, and therefore
Barrier zero-sequence current is easily submerged in the zero-sequence current of the asymmetric generation of distribution system line construction again, is caused using power frequency amount
One-phase ground protection and range finding are extremely difficult.
Therefore, when system with non effectively earth ed neutral occurs singlephase earth fault, the fault type for occurring how is determined,
And the position being out of order a little how is accurately determined when there is permanent fault as problem demanding prompt solution.
The content of the invention
The present invention is based on above mentioned problem, it is proposed that a kind of new technical scheme, in system with non effectively earth ed neutral
During generation singlephase earth fault, the type that is out of order can be accurately determined, and when fault type is permanent fault, can be with
Abort situation is detected exactly.
In view of this, the first aspect of the present invention proposes a kind of position of failure point of system with non effectively earth ed neutral
Determine method, including：Determine whether the circuit in system with non effectively earth ed neutral occurs singlephase earth fault；If the circuit
Generation singlephase earth fault, then reclosing after controlling the breaker of the circuit to trip first；If the breaker reclosing loses
Lose, it is determined that the circuit occurs permanent fault, if the breaker reclosing success, it is determined that the circuit occurs instantaneous
Property failure；In the case of it is determined that the circuit occurs permanent fault, the breaker is controlled to trip again；Obtain described disconnected
The back wave of the reclosure time of road device and the breaker Single-phase Ground Connection Failure of the circuit after tripping again is reached
Time；According to the reclosure time and the back wave arrival time, the position of the Single-phase Ground Connection Failure of the circuit is determined
Put.
In the technical scheme, if there is singlephase earth fault, open circuit in the circuit of system with non effectively earth ed neutral
Reclosing after device tripping operation, if reclosing success, then it is assumed that this time singlephase earth fault is transient fault, if reclosing loses
Lose, then circuit has permanent fault, and circuit breaker trip is controlled again, after tripping by the reclosure time of breaker and again
Reflected traveling wave arrival time in circuit determines the position of the point of the one-way earth fault in circuit.By above scheme, even if
Fault current is not obvious during system with non effectively earth ed neutral generation singlephase earth fault, can also accurately determine the class that is out of order
Type, and when fault type is permanent fault, can also exactly detect abort situation.
In the above-mentioned technical solutions, it is preferable that whether the circuit determined in system with non effectively earth ed neutral occurs
Singlephase earth fault, specifically includes：Obtain zero-sequence voltage samples value, zero-sequence current sampled value and the zero sequence electricity of the circuit
Press the residual voltage virtual value of sampled value；If the residual voltage virtual value is more than or equal to predetermined voltage threshold, right respectively
The zero-sequence voltage samples value and the zero-sequence current sampled value carry out wavelet transformation, to obtain residual voltage Wavelet Component and zero
Sequence electric current Wavelet Component；Wavelet Modulus Maxima and the small wavelength-division of the zero-sequence current of the residual voltage Wavelet Component are calculated respectively
The Wavelet Modulus Maxima of amount；Wavelet Modulus Maxima and the zero-sequence current Wavelet Component according to the residual voltage Wavelet Component
Wavelet Modulus Maxima, determine the initial polarity of traveling wave of residual voltage and the initial polarity of traveling wave of zero-sequence current；According to zero sequence electricity
Initial polarity of traveling wave and the initial polarity of traveling wave of the zero-sequence current are pressed, determines whether the circuit occurs singlephase earth fault.
In the technical scheme, when the initial polarity of traveling wave of residual voltage and the initial traveling wave opposite polarity of zero-sequence current, really
Alignment road there occurs singlephase earth fault, so that singlephase earth fault is identified exactly, and then can in time to list
Phase earth fault is processed, it is ensured that the normal operation of system, saves the cost of system operation.
In any of the above-described technical scheme, it is preferable that the first preset formula is used, respectively to the zero-sequence voltage samples value
Wavelet transformation is carried out with the zero-sequence current sampled value, first preset formula is：
Wherein, X (n) represents the zero-sequence voltage samples value or the zero-sequence current sampled value, if X (n) represents zero sequence
Voltage sample value, thenResidual voltage approximation component is represented,The residual voltage Wavelet Component is represented, if
X (n) represents zero-sequence current sampled value, thenZero-sequence current approximation component is represented,Represent the zero sequence electricity
Stream Wavelet Component, j represents scale-value, hk1Represent the corresponding numerical value of k1 in the first wavelet coefficient sequence, hk2Represent the second small echo
The corresponding numerical value of k2 in coefficient sequence.
In the technical scheme, zero-sequence voltage samples value and zero-sequence current sampled value are entered by using the first preset formula
Row wavelet transformation, ensure that the calculating in varied situations to residual voltage Wavelet Component and zero-sequence current Wavelet Component has
Identical arithmetic logic, reduces calculation error, and whether the judgement precision of singlephase earth fault occurs to improve, and improves to circuit
Overhaul efficiency, and then ensure the operation high efficiency of system.
In any of the above-described technical scheme, it is preferable that use the second preset formula, the residual voltage small echo is calculated respectively
The Wavelet Modulus Maxima of component and the zero-sequence current Wavelet Component, second preset formula is：
Wherein, ifThe residual voltage Wavelet Component of the kth point of jth yardstick is represented, thenTable
Show the Wavelet Modulus Maxima of the residual voltage Wavelet Component of jth yardstick, ifRepresent the kth point of jth yardstick
The zero-sequence current Wavelet Component, thenRepresent the Wavelet Transform Modulus Maximum of the zero-sequence current Wavelet Component of jth yardstick
Value.
In the technical scheme, residual voltage Wavelet Component and zero sequence are calculated by the second preset formula in above-mentioned respectively
The Wavelet Modulus Maxima of electric current Wavelet Component, ensure that in varied situations to the modulus maximum of residual voltage Wavelet Component and
Whether the calculating of the modulus maximum of zero-sequence current Wavelet Component has identical arithmetic logic, reduces calculation error, sent out with improving
The judgement precision of raw singlephase earth fault, improves the overhaul efficiency to circuit, and then ensure the operation high efficiency of system.
In any of the above-described technical scheme, it is preferable that described when being reached according to the reclosure time and the back wave
Between, determine the position of the Single-phase Ground Connection Failure of the circuit, specifically include：According to the reclosure time and the back wave
Arrival time, the distance of the Single-phase Ground Connection Failure of the circuit is calculated using the 3rd preset formula；According to the distance, it is determined that
The position of the Single-phase Ground Connection Failure of the circuit, the 3rd preset formula is：
Wherein, D represents the distance, and t1 represents reclosure time, and t2 represents the back wave arrival time, and V represents line
Mould wave velocity.
In the technical scheme, the reflected traveling wave of the circuit after being tripped again by breaker reclosure time and breaker
Time difference between the time of arrival, the half with the product of line mould wave velocity can just obtain the distance of Single-phase Ground Connection Failure,
So that it is determined that the position of Single-phase Ground Connection Failure.So, after obtaining the position of Single-phase Ground Connection Failure, can just greatly improve to line
The overhaul efficiency on road, so as to ensure the high efficiency of system operation.
The second aspect of the present invention proposes a kind of determining device of the position of failure point of system with non effectively earth ed neutral,
Including：Whether determining unit, the circuit for determining in system with non effectively earth ed neutral there is singlephase earth fault；Control is single
Unit, if determining that the circuit occurs singlephase earth fault for the determining unit, controls the breaker of the circuit first
Reclosing after tripping operation；The determining unit is additionally operable to, if the breaker unsuccessful reclosing, it is determined that the circuit occurs permanent
Property failure, if the breaker reclosing success, it is determined that the circuit occurs transient fault；Described control unit is also used
In in the case of it is determined that the circuit occurs permanent fault, the control breaker trips again；Acquiring unit, is used for
Obtain the reclosure time and the breaker of the breaker Single-phase Ground Connection Failure of the circuit after tripping again
Back wave arrival time；The determining unit is additionally operable to, according to the reclosure time and the back wave arrival time, it is determined that
The position of the Single-phase Ground Connection Failure of the circuit.
In the technical scheme, if there is singlephase earth fault, open circuit in the circuit of system with non effectively earth ed neutral
Reclosing after device tripping operation, if reclosing success, then it is assumed that this time singlephase earth fault is transient fault, if reclosing loses
Lose, then circuit has permanent fault, and circuit breaker trip is controlled again, after tripping by the reclosure time of breaker and again
Reflected traveling wave arrival time in circuit determines the position of the point of the one-way earth fault in circuit.By above scheme, even if
Fault current is not obvious during system with non effectively earth ed neutral generation singlephase earth fault, can also accurately determine the class that is out of order
Type, and when fault type is permanent fault, can also exactly detect abort situation.
In the above-mentioned technical solutions, it is preferable that the determining unit includes：Subelement is obtained, for obtaining the circuit
Zero-sequence voltage samples value, zero-sequence current sampled value and the zero-sequence voltage samples value residual voltage virtual value；Wavelet transformation
Subelement, if being more than or equal to predetermined voltage threshold for the residual voltage virtual value, adopts to the residual voltage respectively
Sample value and the zero-sequence current sampled value carry out wavelet transformation, to obtain residual voltage Wavelet Component and the small wavelength-division of zero-sequence current
Amount；Computation subunit, the Wavelet Modulus Maxima and the zero-sequence current for calculating the residual voltage Wavelet Component respectively is small
The Wavelet Modulus Maxima of wave component；Determination subelement, for the Wavelet Modulus Maxima according to the residual voltage Wavelet Component and
The Wavelet Modulus Maxima of the zero-sequence current Wavelet Component, determines the initial polarity of traveling wave of residual voltage and the initial traveling wave of zero-sequence current
Polarity；The determination subelement is additionally operable to, according to the initial polarity of traveling wave of the residual voltage and the initial traveling wave of the zero-sequence current
Polarity, determines whether the circuit occurs singlephase earth fault.
In the technical scheme, when the initial polarity of traveling wave of residual voltage and the initial traveling wave opposite polarity of zero-sequence current, really
Alignment road there occurs singlephase earth fault, so that singlephase earth fault is identified exactly, and then can in time to list
Phase earth fault is processed, it is ensured that the normal operation of system, saves the cost of system operation.
In any of the above-described technical scheme, it is preferable that the wavelet transformation subelement is specifically for using the first default public affairs
Formula, carries out wavelet transformation, first preset formula to the zero-sequence voltage samples value and the zero-sequence current sampled value respectively
For：
Wherein, X (n) represents the zero-sequence voltage samples value or the zero-sequence current sampled value, if X (n) represents zero sequence
Voltage sample value, thenResidual voltage approximation component is represented,The residual voltage Wavelet Component is represented, if
X (n) represents zero-sequence current sampled value, thenZero-sequence current approximation component is represented,Represent the zero sequence electricity
Stream Wavelet Component, j represents scale-value, hk1Represent the corresponding numerical value of k1 in the first wavelet coefficient sequence, hk2Represent the second small echo
The corresponding numerical value of k2 in coefficient sequence.
In the technical scheme, zero-sequence voltage samples value and zero-sequence current sampled value are entered by using the first preset formula
Row wavelet transformation, ensure that the calculating in varied situations to residual voltage Wavelet Component and zero-sequence current Wavelet Component has
Identical arithmetic logic, reduces calculation error, and whether the judgement precision of singlephase earth fault occurs to improve, and improves to circuit
Overhaul efficiency, and then ensure the operation high efficiency of system.
In any of the above-described technical scheme, it is preferable that the computation subunit specifically for, using the second preset formula,
The Wavelet Modulus Maxima of the residual voltage Wavelet Component and the zero-sequence current Wavelet Component is calculated respectively, and described second presets
Formula is：
Wherein, ifThe residual voltage Wavelet Component of the kth point of jth yardstick is represented, thenTable
Show the Wavelet Modulus Maxima of the residual voltage Wavelet Component of jth yardstick, ifRepresent the kth point of jth yardstick
The zero-sequence current Wavelet Component, thenRepresent the Wavelet Transform Modulus Maximum of the zero-sequence current Wavelet Component of jth yardstick
Value.
In the technical scheme, residual voltage Wavelet Component and zero sequence are calculated by the second preset formula in above-mentioned respectively
The Wavelet Modulus Maxima of electric current Wavelet Component, ensure that in varied situations to the modulus maximum of residual voltage Wavelet Component and
Whether the calculating of the modulus maximum of zero-sequence current Wavelet Component has identical arithmetic logic, reduces calculation error, sent out with improving
The judgement precision of raw singlephase earth fault, improves the overhaul efficiency to circuit, and then ensure the operation high efficiency of system.
In any of the above-described technical scheme, it is preferable that the determining unit specifically for, according to the reclosure time and
The back wave arrival time, the distance of the Single-phase Ground Connection Failure of the circuit is calculated using the 3rd preset formula, according to institute
Distance is stated, the position of the Single-phase Ground Connection Failure of the circuit is determined, the 3rd preset formula is：
Wherein, D represents the distance, and t1 represents reclosure time, and t2 represents the back wave arrival time, and V represents line
Mould wave velocity.
In the technical scheme, the reflected traveling wave of the circuit after being tripped again by breaker reclosure time and breaker
Time difference between the time of arrival, the half with the product of line mould wave velocity can just obtain the distance of Single-phase Ground Connection Failure,
So that it is determined that the position of Single-phase Ground Connection Failure.So, after obtaining the position of Single-phase Ground Connection Failure, can just greatly improve to line
The overhaul efficiency on road, so as to ensure the high efficiency of system operation.
By technical scheme, when there is singlephase earth fault in system with non effectively earth ed neutral, can be true
Fault type is made, and when fault type is permanent fault, can also exactly detect abort situation.
Brief description of the drawings
Fig. 1 shows the position of failure point of system with non effectively earth ed neutral according to an embodiment of the invention really
Determine the schematic flow sheet of method；
Fig. 2 shows the position of failure point of system with non effectively earth ed neutral according to another embodiment of the invention
Determine the schematic flow sheet of method；
Fig. 3 shows the position of failure point of system with non effectively earth ed neutral according to an embodiment of the invention really
Determine the block diagram of device.
Specific embodiment
It is below in conjunction with the accompanying drawings and specific real in order to the above objects, features and advantages of the present invention can be more clearly understood that
Mode is applied to be further described in detail the present invention.It should be noted that in the case where not conflicting, the implementation of the application
Feature in example and embodiment can be mutually combined.
Many details are elaborated in the following description in order to fully understand the present invention, but, the present invention may be used also
Implemented with being different from other modes described here using other, therefore, protection scope of the present invention is not by described below
Specific embodiment limitation.
Fig. 1 shows the position of failure point of system with non effectively earth ed neutral according to an embodiment of the invention really
Determine the schematic flow sheet of method.
As shown in figure 1, the position of failure point of system with non effectively earth ed neutral according to an embodiment of the invention
Determine method, including：
Step S102, determines whether the circuit in system with non effectively earth ed neutral occurs singlephase earth fault.
Step S104, if the circuit occurs singlephase earth fault, after controlling the breaker of the circuit to trip first
Reclosing.
Step S106, if the breaker unsuccessful reclosing, it is determined that the circuit occurs permanent fault, if described disconnected
Think highly of closing success in road, it is determined that the circuit occurs transient fault.
Step S108, in the case of it is determined that the circuit occurs permanent fault, controls the breaker to trip again.
Step S110, obtains the reclosure time and the breaker of the breaker circuit after tripping again
The back wave arrival time of Single-phase Ground Connection Failure.
Step S112, according to the reclosure time and the back wave arrival time, determines that the single-phase of the circuit connects
The position of earth fault point.
In the technical scheme, if there is singlephase earth fault, open circuit in the circuit of system with non effectively earth ed neutral
Reclosing after device tripping operation, if reclosing success, then it is assumed that this time singlephase earth fault is transient fault, if reclosing loses
Lose, then circuit has permanent fault, and circuit breaker trip is controlled again, after tripping by the reclosure time of breaker and again
Reflected traveling wave arrival time in circuit determines the position of the point of the one-way earth fault in circuit.By above scheme, even if
Fault current is not obvious during system with non effectively earth ed neutral generation singlephase earth fault, can also accurately determine the class that is out of order
Type, and when fault type is permanent fault, can also exactly detect abort situation.
In the above-mentioned technical solutions, it is preferable that step S102 is specifically included：Obtain the zero-sequence voltage samples of the circuit
The residual voltage virtual value of value, zero-sequence current sampled value and the zero-sequence voltage samples value；If the residual voltage virtual value is big
In or equal to predetermined voltage threshold, then small echo change is carried out to the zero-sequence voltage samples value and the zero-sequence current sampled value respectively
Change, to obtain residual voltage Wavelet Component and zero-sequence current Wavelet Component；The small of the residual voltage Wavelet Component is calculated respectively
The Wavelet Modulus Maxima of ripple modulus maximum and the zero-sequence current Wavelet Component；According to the small echo of the residual voltage Wavelet Component
The Wavelet Modulus Maxima of modulus maximum and the zero-sequence current Wavelet Component, determines the initial polarity of traveling wave of residual voltage and zero sequence electricity
Flow initial polarity of traveling wave；According to the initial polarity of traveling wave of the residual voltage and the initial polarity of traveling wave of the zero-sequence current, institute is determined
State whether circuit occurs singlephase earth fault.
In the technical scheme, when the initial polarity of traveling wave of residual voltage and the initial traveling wave opposite polarity of zero-sequence current, really
Alignment road there occurs singlephase earth fault, so that singlephase earth fault is identified exactly, and then can in time to list
Phase earth fault is processed, it is ensured that the normal operation of system, saves the cost of system operation.
In any of the above-described technical scheme, it is preferable that the first preset formula is used, respectively to the zero-sequence voltage samples value
Wavelet transformation is carried out with the zero-sequence current sampled value, first preset formula is：
Wherein, X (n) represents the zero-sequence voltage samples value or the zero-sequence current sampled value, if X (n) represents zero sequence
Voltage sample value, thenResidual voltage approximation component is represented,The residual voltage Wavelet Component is represented, if
X (n) represents zero-sequence current sampled value, thenZero-sequence current approximation component is represented,Represent the zero sequence electricity
Stream Wavelet Component, j represents scale-value, hk1Represent the corresponding numerical value of k1 in the first wavelet coefficient sequence, hk2Represent the second small echo
The corresponding numerical value of k2 in coefficient sequence.
For example, { hk1}k1={ 0.125,0.375,0.375,0.125 }, (k1=-1,0,1,2),
{gk2}k2={ -2, -2 }, (k2=0,1), j=1,2,3 or 4.
In the technical scheme, zero-sequence voltage samples value and zero-sequence current sampled value are entered by using the first preset formula
Row wavelet transformation, ensure that the calculating in varied situations to residual voltage Wavelet Component and zero-sequence current Wavelet Component has
Identical arithmetic logic, reduces calculation error, and whether the judgement precision of singlephase earth fault occurs to improve, and improves to circuit
Overhaul efficiency, and then ensure the operation high efficiency of system.
In any of the above-described technical scheme, it is preferable that use the second preset formula, the residual voltage small echo is calculated respectively
The Wavelet Modulus Maxima of component and the zero-sequence current Wavelet Component, second preset formula is：
Wherein, ifThe residual voltage Wavelet Component of the kth point of jth yardstick is represented, then
The Wavelet Modulus Maxima of the residual voltage Wavelet Component of jth yardstick is represented, ifRepresent the kth point of jth yardstick
The zero-sequence current Wavelet Component, thenRepresent the small echo mould pole of the zero-sequence current Wavelet Component of jth yardstick
Big value.
In the technical scheme, residual voltage Wavelet Component and zero sequence are calculated by the second preset formula in above-mentioned respectively
The Wavelet Modulus Maxima of electric current Wavelet Component, ensure that in varied situations to the modulus maximum of residual voltage Wavelet Component and
Whether the calculating of the modulus maximum of zero-sequence current Wavelet Component has identical arithmetic logic, reduces calculation error, sent out with improving
The judgement precision of raw singlephase earth fault, improves the overhaul efficiency to circuit, and then ensure the operation high efficiency of system.
In any of the above-described technical scheme, it is preferable that step S112 is specifically included：According to the reclosure time and described
Back wave arrival time, the distance of the Single-phase Ground Connection Failure of the circuit is calculated using the 3rd preset formula；According to it is described away from
From, determining the position of the Single-phase Ground Connection Failure of the circuit, the 3rd preset formula is：
Wherein, D represents the distance, and t1 represents reclosure time, and t2 represents the back wave arrival time, and V represents line
Mould wave velocity.
In the technical scheme, the reflected traveling wave of the circuit after being tripped again by breaker reclosure time and breaker
Time difference between the time of arrival, the half with the product of line mould wave velocity can just obtain the distance of Single-phase Ground Connection Failure,
So that it is determined that the position of Single-phase Ground Connection Failure.So, after obtaining the position of Single-phase Ground Connection Failure, can just greatly improve to line
The overhaul efficiency on road, so as to ensure the high efficiency of system operation.
Fig. 2 shows the position of failure point of system with non effectively earth ed neutral according to another embodiment of the invention
Determine the schematic flow sheet of method.
As shown in Fig. 2 the position of failure point of system with non effectively earth ed neutral according to another embodiment of the invention
Determination method, including：
Step S202, obtains zero-sequence voltage samples value and zero-sequence current sampled value, calculates residual voltage virtual value U0.Specifically
Ground, by carrying out FFT (Fast Fourier Transformation, fast Fourier transform) to zero-sequence voltage samples value, in the hope of
Obtain residual voltage virtual value U0.
Step S204, judges whether to meet U0<U0set, when judged result is to be, performs step S214, is judging to tie
When fruit is no, step S216 is performed.
Step S206, carries out two and enters wavelet transform to try to achieve zero sequence to zero-sequence voltage samples value and zero-sequence current sampled value
Voltage Wavelet Component and zero-sequence current Wavelet Component.Wherein, using the derived function of three subcenter B-spline functions as small echo letter
Number.
Step S208, Wavelet Modulus Maxima is sought to residual voltage Wavelet Component and zero-sequence current Wavelet Component.
Step S210, according to residual voltage Wavelet Component and the Wavelet Modulus Maxima of zero-sequence current Wavelet Component, determines zero
The initial polarity of traveling wave of sequence voltage and the initial polarity of traveling wave of zero-sequence current.
Step S212, judges whether the initial polarity of traveling wave of residual voltage and the initial polarity of traveling wave of zero-sequence current are identical, are sentencing
Disconnected result, when judged result is no, performs step S216 when being, to perform step S214.
Step S214, protects involution.
Step S216, is judged to singlephase earth fault, and sending signal makes circuit breaker trip.
Step S218, time delay 1s-2s.
Step S220, reclosing, and record reclosure time t1, time delay.
Step S222, judges whether reclosing success, in reclosing success, step S224 is performed, in unsuccessful reclosing
When, perform step S226.
Step S224, is judged to transient fault.
Step S226, is judged to permanent fault, trips again.
Step S228, obtains reclosing to the line mould current traveling wave between reclosing again, to record the reflection of trouble point
Ripple arrival time t2.
Step S230, by formulaCalculate the distance of trouble point.Wherein, D represent trouble point away from
From t1 represents reclosure time, and t2 represents back wave arrival time, and V represents line mould wave velocity.
Fig. 3 shows the position of failure point of system with non effectively earth ed neutral according to an embodiment of the invention really
Determine the block diagram of device.
As shown in figure 3, the position of failure point of system with non effectively earth ed neutral according to an embodiment of the invention
Determining device 300, including：Determining unit 302, control unit 304 and acquiring unit 306.
Whether determining unit 302, the circuit for determining in system with non effectively earth ed neutral there is singlephase earth fault；
Control unit 304, if determining that the circuit occurs singlephase earth fault for the determining unit 302, controls the circuit
Breaker trip first after reclosing；The determining unit 302 is additionally operable to, if the breaker unsuccessful reclosing, it is determined that
There is permanent fault in the circuit, if the breaker reclosing success, it is determined that the circuit occurs transient fault；Institute
State control unit 304 to be additionally operable to, in the case of it is determined that the circuit occurs permanent fault, control the breaker to jump again
Lock；Acquiring unit 306, for obtaining the reclosure time and the breaker of the breaker circuit after tripping again
Single-phase Ground Connection Failure back wave arrival time；The determining unit 302 is additionally operable to, according to the reclosure time and institute
Back wave arrival time is stated, the position of the Single-phase Ground Connection Failure of the circuit is determined.
In the technical scheme, if there is singlephase earth fault, open circuit in the circuit of system with non effectively earth ed neutral
Reclosing after device tripping operation, if reclosing success, then it is assumed that this time singlephase earth fault is transient fault, if reclosing loses
Lose, then circuit has permanent fault, and circuit breaker trip is controlled again, after tripping by the reclosure time of breaker and again
Reflected traveling wave arrival time in circuit determines the position of the point of the one-way earth fault in circuit.By above scheme, even if
Fault current is not obvious during system with non effectively earth ed neutral generation singlephase earth fault, can also accurately determine the class that is out of order
Type, and when fault type is permanent fault, can also exactly detect abort situation.
In the above-mentioned technical solutions, it is preferable that the determining unit 302 includes：Subelement 3022 is obtained, for obtaining
State the residual voltage virtual value of the zero-sequence voltage samples value, zero-sequence current sampled value and the zero-sequence voltage samples value of circuit；It is small
Wave conversion subelement 3024, if being more than or equal to predetermined voltage threshold for the residual voltage virtual value, respectively to described
Zero-sequence voltage samples value and the zero-sequence current sampled value carry out wavelet transformation, to obtain residual voltage Wavelet Component and zero sequence electricity
Stream Wavelet Component；Computation subunit 3026, Wavelet Modulus Maxima and institute for calculating the residual voltage Wavelet Component respectively
State the Wavelet Modulus Maxima of zero-sequence current Wavelet Component；Determination subelement 3028, for according to the residual voltage Wavelet Component
Wavelet Modulus Maxima and the zero-sequence current Wavelet Component Wavelet Modulus Maxima, determine the initial polarity of traveling wave of residual voltage and
The initial polarity of traveling wave of zero-sequence current；The determination subelement 3028 is additionally operable to, according to the initial polarity of traveling wave of the residual voltage and
The initial polarity of traveling wave of zero-sequence current, determines whether the circuit occurs singlephase earth fault.
In the technical scheme, when the initial polarity of traveling wave of residual voltage and the initial traveling wave opposite polarity of zero-sequence current, really
Alignment road there occurs singlephase earth fault, so that singlephase earth fault is identified exactly, and then can in time to list
Phase earth fault is processed, it is ensured that the normal operation of system, saves the cost of system operation.
In any of the above-described technical scheme, it is preferable that the wavelet transformation subelement 3024 is specifically for pre- using first
If formula, wavelet transformation is carried out to the zero-sequence voltage samples value and the zero-sequence current sampled value respectively, described first presets
Formula is：
Wherein, X (n) represents the zero-sequence voltage samples value or the zero-sequence current sampled value, if X (n) represents zero sequence
Voltage sample value, thenResidual voltage approximation component is represented,The residual voltage Wavelet Component is represented, if
X (n) represents zero-sequence current sampled value, thenZero-sequence current approximation component is represented,Represent the zero sequence electricity
Stream Wavelet Component, j represents scale-value, hk1Represent the corresponding numerical value of k1 in the first wavelet coefficient sequence, hk2Represent the second small echo
The corresponding numerical value of k2 in coefficient sequence.
In the technical scheme, zero-sequence voltage samples value and zero-sequence current sampled value are entered by using the first preset formula
Row wavelet transformation, ensure that the calculating in varied situations to residual voltage Wavelet Component and zero-sequence current Wavelet Component has
Identical arithmetic logic, reduces calculation error, and whether the judgement precision of singlephase earth fault occurs to improve, and improves to circuit
Overhaul efficiency, and then ensure the operation high efficiency of system.
In any of the above-described technical scheme, it is preferable that the computation subunit 3026 is specifically for using the second default public affairs
Formula, calculates the Wavelet Modulus Maxima of the residual voltage Wavelet Component and the zero-sequence current Wavelet Component, described second respectively
Preset formula is：
Wherein, ifThe residual voltage Wavelet Component of the kth point of jth yardstick is represented, thenTable
Show the Wavelet Modulus Maxima of the residual voltage Wavelet Component of jth yardstick, ifRepresent the kth point of jth yardstick
The zero-sequence current Wavelet Component, thenRepresent the Wavelet Transform Modulus Maximum of the zero-sequence current Wavelet Component of jth yardstick
Value.
In the technical scheme, residual voltage Wavelet Component and zero sequence are calculated by the second preset formula in above-mentioned respectively
The Wavelet Modulus Maxima of electric current Wavelet Component, ensure that in varied situations to the modulus maximum of residual voltage Wavelet Component and
Whether the calculating of the modulus maximum of zero-sequence current Wavelet Component has identical arithmetic logic, reduces calculation error, sent out with improving
The judgement precision of raw singlephase earth fault, improves the overhaul efficiency to circuit, and then ensure the operation high efficiency of system.
In any of the above-described technical scheme, it is preferable that the determining unit 302 is specifically for during according to the reclosing
Between and the back wave arrival time, use the 3rd preset formula to calculate the distance of the Single-phase Ground Connection Failure of the circuit, root
According to the distance, the position of the Single-phase Ground Connection Failure of the circuit is determined, the 3rd preset formula is：
Wherein, D represents the distance, and t1 represents reclosure time, and t2 represents the back wave arrival time, and V represents line
Mould wave velocity.
In the technical scheme, the reflected traveling wave of the circuit after being tripped again by breaker reclosure time and breaker
Time difference between the time of arrival, the half with the product of line mould wave velocity can just obtain the distance of Single-phase Ground Connection Failure,
So that it is determined that the position of Single-phase Ground Connection Failure.So, after obtaining the position of Single-phase Ground Connection Failure, can just greatly improve to line
The overhaul efficiency on road, so as to ensure the high efficiency of system operation.
Technical scheme is described in detail above in association with accompanying drawing, by technical scheme, in neutral point
When there is singlephase earth fault in non-effectively earthed system, it may be determined that be out of order type, and when fault type is permanent event
Barrier, can also exactly detect abort situation.
In the present invention, term " first ", " second " are only used for the purpose for describing, and it is not intended that indicating or implying phase
To importance；Term " multiple " represents two or more.For the ordinary skill in the art, can be according to tool
Body situation understands above-mentioned term concrete meaning in the present invention.
The preferred embodiments of the present invention are the foregoing is only, is not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.It is all within the spirit and principles in the present invention, made any repair
Change, equivalent, improvement etc., should be included within the scope of the present invention.
Claims (10)
1. a kind of determination method of the position of failure point of system with non effectively earth ed neutral, it is characterised in that including：
Determine whether the circuit in system with non effectively earth ed neutral occurs singlephase earth fault；
If there is singlephase earth fault, reclosing after controlling the breaker of the circuit to trip first in the circuit；
If the breaker unsuccessful reclosing, it is determined that the circuit occurs permanent fault, if the breaker reclosing into
Work(, it is determined that the circuit occurs transient fault；
In the case of it is determined that the circuit occurs permanent fault, the breaker is controlled to trip again；
Obtain the singlephase earth fault of reclosure time and the breaker circuit after tripping again of the breaker
The back wave arrival time of point；
According to the reclosure time and the back wave arrival time, the position of the Single-phase Ground Connection Failure of the circuit is determined
Put.
2. the determination method of the position of failure point of system with non effectively earth ed neutral according to claim 1, its feature exists
In whether the circuit determined in system with non effectively earth ed neutral occurs singlephase earth fault, specifically includes：
Obtain the residual voltage of the zero-sequence voltage samples value, zero-sequence current sampled value and the zero-sequence voltage samples value of the circuit
Virtual value；
If the residual voltage virtual value is more than or equal to predetermined voltage threshold, respectively to the zero-sequence voltage samples value and institute
Stating zero-sequence current sampled value carries out wavelet transformation, to obtain residual voltage Wavelet Component and zero-sequence current Wavelet Component；
The Wavelet Modulus Maxima of the residual voltage Wavelet Component and the small echo mould of the zero-sequence current Wavelet Component are calculated respectively
Maximum；
The Wavelet Transform Modulus Maximum of Wavelet Modulus Maxima and the zero-sequence current Wavelet Component according to the residual voltage Wavelet Component
Value, determines the initial polarity of traveling wave of residual voltage and the initial polarity of traveling wave of zero-sequence current；
According to the initial polarity of traveling wave of the residual voltage and the initial polarity of traveling wave of the zero-sequence current, determine whether the circuit is sent out
Raw singlephase earth fault.
3. the determination method of the position of failure point of system with non effectively earth ed neutral according to claim 2, its feature exists
In,
Using the first preset formula, small echo change is carried out to the zero-sequence voltage samples value and the zero-sequence current sampled value respectively
Change,
First preset formula is：
Wherein, X (n) represents the zero-sequence voltage samples value or the zero-sequence current sampled value, if X (n) represents residual voltage
Sampled value, thenResidual voltage approximation component is represented,The residual voltage Wavelet Component is represented, if X (n)
Zero-sequence current sampled value is represented, thenZero-sequence current approximation component is represented,Represent that the zero-sequence current is small
Wave component, j represents scale-value, hk1Represent the corresponding numerical value of k1 in the first wavelet coefficient sequence, hk2Represent the second wavelet coefficient
The corresponding numerical value of k2 in sequence.
4. the determination method of the position of failure point of system with non effectively earth ed neutral according to claim 3, its feature exists
In,
Using the second preset formula, the small echo of the residual voltage Wavelet Component and the zero-sequence current Wavelet Component is calculated respectively
Modulus maximum,
Second preset formula is：
Wherein, ifThe residual voltage Wavelet Component of the kth point of jth yardstick is represented, thenRepresent the
The Wavelet Modulus Maxima of the residual voltage Wavelet Component of j yardsticks, ifRepresent jth yardstick kth point it is described
Zero-sequence current Wavelet Component, thenRepresent the Wavelet Modulus Maxima of the zero-sequence current Wavelet Component of jth yardstick.
5. the determination side of the position of failure point of system with non effectively earth ed neutral according to any one of claim 1 to 4
Method, it is characterised in that described according to the reclosure time and the back wave arrival time, determines that the single-phase of the circuit connects
The position of earth fault point, specifically includes：
According to the reclosure time and the back wave arrival time, the single-phase of the circuit is calculated using the 3rd preset formula
The distance of earth fault；
According to the distance, the position of the Single-phase Ground Connection Failure of the circuit is determined,
3rd preset formula is：
Wherein, D represents the distance, and t1 represents the reclosure time, and t2 represents the back wave arrival time, and V represents line
Mould wave velocity.
6. a kind of determining device of the position of failure point of system with non effectively earth ed neutral, it is characterised in that including：
Whether determining unit, the circuit for determining in system with non effectively earth ed neutral there is singlephase earth fault；
Control unit, if determining that the circuit occurs singlephase earth fault for the determining unit, controls the circuit
Breaker trip first after reclosing；
The determining unit is additionally operable to, if the breaker unsuccessful reclosing, it is determined that the circuit occurs permanent fault, if
The breaker reclosing success, it is determined that the circuit occurs transient fault；
Described control unit is additionally operable to, and in the case of it is determined that the circuit occurs permanent fault, controls the breaker again
Secondary tripping operation；
Acquiring unit, for obtaining the reclosure time and the breaker of the breaker circuit after tripping again
The back wave arrival time of Single-phase Ground Connection Failure；
The determining unit is additionally operable to, and according to the reclosure time and the back wave arrival time, determines the circuit
The position of Single-phase Ground Connection Failure.
7. the determining device of the position of failure point of system with non effectively earth ed neutral according to claim 6, its feature exists
In the determining unit includes：
Obtain subelement, zero-sequence voltage samples value, zero-sequence current sampled value and the residual voltage for obtaining the circuit
The residual voltage virtual value of sampled value；
Wavelet transformation subelement, if being more than or equal to predetermined voltage threshold for the residual voltage virtual value, respectively to institute
Stating zero-sequence voltage samples value and the zero-sequence current sampled value carries out wavelet transformation, to obtain residual voltage Wavelet Component and zero sequence
Electric current Wavelet Component；
Computation subunit, the Wavelet Modulus Maxima and the zero-sequence current for calculating the residual voltage Wavelet Component respectively is small
The Wavelet Modulus Maxima of wave component；
Determination subelement, for the Wavelet Modulus Maxima according to the residual voltage Wavelet Component and the small wavelength-division of the zero-sequence current
The Wavelet Modulus Maxima of amount, determines the initial polarity of traveling wave of residual voltage and the initial polarity of traveling wave of zero-sequence current；
The determination subelement is additionally operable to, according to the initial polarity of traveling wave of the residual voltage and the initial traveling wave pole of the zero-sequence current
Property, determine whether the circuit occurs singlephase earth fault.
8. the determining device of the position of failure point of system with non effectively earth ed neutral according to claim 7, its feature exists
In, the wavelet transformation subelement specifically for,
Using the first preset formula, small echo change is carried out to the zero-sequence voltage samples value and the zero-sequence current sampled value respectively
Change,
First preset formula is：
Wherein, X (n) represents the zero-sequence voltage samples value or the zero-sequence current sampled value, if X (n) represents residual voltage
Sampled value, thenResidual voltage approximation component is represented,The residual voltage Wavelet Component is represented, if X (n)
Zero-sequence current sampled value is represented, thenZero-sequence current approximation component is represented,Represent that the zero-sequence current is small
Wave component, j represents scale-value, hk1Represent the corresponding numerical value of k1 in the first wavelet coefficient sequence, hk2Represent the second wavelet coefficient
The corresponding numerical value of k2 in sequence.
9. the determining device of the position of failure point of system with non effectively earth ed neutral according to claim 8, its feature exists
In, the computation subunit specifically for,
Using the second preset formula, the small echo of the residual voltage Wavelet Component and the zero-sequence current Wavelet Component is calculated respectively
Modulus maximum,
Second preset formula is：
Wherein, ifThe residual voltage Wavelet Component of the kth point data of jth yardstick is represented, thenTable
Show the Wavelet Modulus Maxima of the residual voltage Wavelet Component of jth yardstick, ifRepresent the kth point of jth yardstick
The zero-sequence current Wavelet Component, thenRepresent the Wavelet Transform Modulus Maximum of the zero-sequence current Wavelet Component of jth yardstick
Value.
10. the determination of the position of failure point of the system with non effectively earth ed neutral according to any one of claim 6 to 9 is filled
Put, it is characterised in that the determining unit specifically for,
According to the reclosure time and the back wave arrival time, the single-phase of the circuit is calculated using the 3rd preset formula
The distance of earth fault, according to the distance, determines the position of the Single-phase Ground Connection Failure of the circuit,
3rd preset formula is：
Wherein, D represents the distance, and t1 represents the reclosure time, and t2 represents the back wave arrival time, and V represents line
Mould wave velocity.
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| CN111130071A (en) * | 2019-12-23 | 2020-05-08 | 贵州电网有限责任公司 | Ground fault self-healing system suitable for low current grounding system |
| CN111146773A (en) * | 2019-12-23 | 2020-05-12 | 贵州电网有限责任公司 | Single-phase earth fault self-healing method for small current grounding system |
| WO2022121782A1 (en) * | 2020-12-12 | 2022-06-16 | 保定钰鑫电气科技有限公司 | Method for processing interphase short circuit of three-phase non-effective grounding power supply system |
| CN113109668A (en) * | 2021-04-12 | 2021-07-13 | 国网陕西省电力公司西安供电公司 | Power distribution network asymmetric fault positioning method based on reclosing zero-mode traveling wave mutation |
| CN113109668B (en) * | 2021-04-12 | 2022-12-20 | 国网陕西省电力公司西安供电公司 | Power distribution network asymmetric fault positioning method based on reclosing zero-mode traveling wave mutation |
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