CN110333428A - A kind of mixed power transmission line fault distance-finding method, device and computer storage medium - Google Patents
A kind of mixed power transmission line fault distance-finding method, device and computer storage medium Download PDFInfo
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- CN110333428A CN110333428A CN201910557323.3A CN201910557323A CN110333428A CN 110333428 A CN110333428 A CN 110333428A CN 201910557323 A CN201910557323 A CN 201910557323A CN 110333428 A CN110333428 A CN 110333428A
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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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- 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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Abstract
The present invention relates to a kind of mixed power transmission line fault distance-finding method, device and computer storage mediums, when a failure occurs it, from sending end to receiving end, successively calculate the measurement impedance of each section of route, and compare measurement impedance and the impedance of part of path overall length to determine whether failure is in this section of route, until determining part of path locating for failure, fault localization is finally carried out；Wherein, for a certain section of route, the voltage and current data with this section of route head end are calculated according to the wave impedance and propagation coefficient of the voltage and current data of the last period route head end and the last period route, then, the measurement impedance of this section of route is calculated according to the voltage and current data of this section of route head end.Therefore, the mixed power transmission line fault distance-finding method can be realized the accurate positionin of failure, compared to traditional fault distance-finding method, which applies can significantly promote fault localization precision in mixed power transmission line, reduce fault localization error.
Description
Technical field
The present invention relates to a kind of mixed power transmission line fault distance-finding method, device and computer storage mediums.
Background technique
Ultra-high-tension power transmission line needs accurately to know abort situation after breaking down, so as to Quick overhaul, therefore high-tension line
Protect equal config failure distance measurement function.The most popular method of route protection fault localization is to measure failure after the failure occurred
Point is to the impedance of protection installation place, and according to the ratio calculation abort situation of measurement impedance and total track length impedance, this method is suitable
For the equally distributed route of line impedance parameter.But restricted by transmission of electricity corridor soil factor and environmental factor, at present
Mixed power transmission line is overhead line-cable mixed set-up using more and more extensive, relatively common mixed power transmission line
Transmission line of electricity.Since the parameter of overhead line part and cable part has a certain difference, same electric current is in different parameters
Voltage landing in route unit length is different, causes to apply the meeting in mixed power transmission line big when traditional fault distance-finding method
Amplitude increases range error, and then fault localization precision is greatly lowered.
Summary of the invention
The object of the present invention is to provide a kind of mixed power transmission line fault distance-finding method, device and computer storage medium,
Fault localization precision can be reduced when on mixed power transmission line to solve the problems, such as that existing fault distance-finding method is applied.
To achieve the above object, the solution of the present invention includes a kind of mixed power transmission line fault distance-finding method, including following
Step:
(1) mixed power transmission line is divided at least twolink, keeps the type of adjacent twolink different；
(2) when a failure occurs it, from sending end to receiving end, the measurement impedance of each section of route is successively calculated, until determining failure
Locating part of path；
Wherein, in the measurement impedance that either segment route is calculated, the measurement impedance and the overall length of this section of route are hindered
It is anti-to compare, if measurement impedance is less than or equal to overall length impedance, it is determined that failure is in this section of route；If measurement impedance is greater than
Overall length impedance then calculates the measurement impedance of next section of route；Wherein, when calculating the measurement impedance of first segment route, according to inspection
The measurement impedance of first segment route is calculated in the voltage and current data of the first segment route head end measured；Continue after computation each
When the measurement impedance of section route, according to the voltage and current data of the last period route head end and the wave impedance of the last period route and
The voltage and current data of this section of route head end are calculated in propagation coefficient, then, according to the voltage and electricity of this section of route head end
Flow data calculates the measurement impedance of this section of route；
(3) the measurement impedance of the part of path according to locating for failure carries out the fault localization of mixed power transmission line.
The measurement impedance of each section of route in mixed power transmission line is individually calculated, when there is no in the section for failure
When in route, according to the pass between the voltage and current data of this section of route head end and the voltage and current data of next section of route head end
The voltage and current data of next section of route head end are calculated in system, then calculate the measurement impedance of next section of route, and so on,
Until the corresponding measurement impedance of a certain section of route occur is less than or equal to the corresponding impedance of this section of total track length, then, energy
Guilty culprit route is accessed, the fault localization of mixed power transmission line is carried out according to obtained measurement impedance.Therefore, regardless of mixing
There are what kind of difference between each section of route in transmission line of electricity, which will mix power transmission line
Road is segmented, and is broken the whole up into parts, and the difference between route just no longer influences the calculating of measurement impedance, then, the mixing power transmission line
Road fault distance-finding method can be realized as the accurate positionin of failure, compared to traditional fault distance-finding method, the mixing power transmission line
Road fault distance-finding method is applied can significantly promote fault localization precision in mixed power transmission line, reduce fault localization error.
Further, in order to improve each section of route head end voltage and current data accuracy, according to i-th section of route head end
Voltage and current data and the wave impedance and propagation coefficient of i-th section of route the voltage of i+1 section route head end is calculated
With the calculation formula of current data are as follows:
Wherein, i=1,2 ..., T-1, T be mixed power transmission line divide route number of segment,For i+1 section route
The voltage data of head end,For the current data of i+1 section route head end,For the voltage data of i-th section of route head end,For the current data of i-th section of route head end, P=0,1,2, as P=0, corresponding voltage is residual voltage, corresponding electric current
For zero-sequence current；As P=1, corresponding voltage is positive sequence voltage, and corresponding electric current is forward-order current；It is corresponding as P=2
Voltage is negative sequence voltage, and corresponding electric current is negative-sequence current；Zcr(i)For the wave impedance of i-th section of route, γ(i)For i-th section of route
Propagation coefficient, LiFor i-th section of total track length.
Further, Zcr(i)And γ(i)Calculation formula are as follows:
Wherein, l(i)For the inductance of i-th section of route, c(i)For the capacitor of i-th section of route.
The present invention also provides a kind of mixed power transmission line fault location device, including memory, processor and it is stored in
In the memory and the computer program that can run on a processor, the processor are real when executing the computer program
Existing mixed power transmission line fault distance-finding method the following steps are included:
(1) mixed power transmission line is divided at least twolink, keeps the type of adjacent twolink different；
(2) when a failure occurs it, from sending end to receiving end, the measurement impedance of each section of route is successively calculated, until determining failure
Locating part of path；
Wherein, in the measurement impedance that either segment route is calculated, the measurement impedance and the overall length of this section of route are hindered
It is anti-to compare, if measurement impedance is less than or equal to overall length impedance, it is determined that failure is in this section of route；If measurement impedance is greater than
Overall length impedance then calculates the measurement impedance of next section of route；Wherein, when calculating the measurement impedance of first segment route, according to inspection
The measurement impedance of first segment route is calculated in the voltage and current data of the first segment route head end measured；Continue after computation each
When the measurement impedance of section route, according to the voltage and current data of the last period route head end and the wave impedance of the last period route and
The voltage and current data of this section of route head end are calculated in propagation coefficient, then, according to the voltage and electricity of this section of route head end
Flow data calculates the measurement impedance of this section of route；
(3) the measurement impedance of the part of path according to locating for failure carries out the fault localization of mixed power transmission line.
The measurement impedance of each section of route in mixed power transmission line is individually calculated, when there is no in the section for failure
When in route, according to the pass between the voltage and current data of this section of route head end and the voltage and current data of next section of route head end
The voltage and current data of next section of route head end are calculated in system, then calculate the measurement impedance of next section of route, and so on,
Until the corresponding measurement impedance of a certain section of route occur is less than or equal to the corresponding impedance of this section of total track length, then, energy
Guilty culprit route is accessed, the fault localization of mixed power transmission line is carried out according to obtained measurement impedance.Therefore, regardless of mixing
There are what kind of difference between each section of route in transmission line of electricity, which will mix power transmission line
Road is segmented, and is broken the whole up into parts, and the difference between route just no longer influences the calculating of measurement impedance, then, the mixing power transmission line
Road fault location device can be realized as the accurate positionin of failure, compared to traditional fault localization mode, the mixing power transmission line
Road fault location device is applied can significantly promote fault localization precision in mixed power transmission line, reduce fault localization error.
Further, in order to improve each section of route head end voltage and current data accuracy, according to i-th section of route head end
Voltage and current data and the wave impedance and propagation coefficient of i-th section of route the voltage of i+1 section route head end is calculated
With the calculation formula of current data are as follows:
Wherein, i=1,2 ..., T-1, T be mixed power transmission line divide route number of segment,For i+1 section route
The voltage data of head end,For the current data of i+1 section route head end,For the voltage data of i-th section of route head end,For the current data of i-th section of route head end, P=0,1,2, as P=0, corresponding voltage is residual voltage, corresponding electric current
For zero-sequence current；As P=1, corresponding voltage is positive sequence voltage, and corresponding electric current is forward-order current；It is corresponding as P=2
Voltage is negative sequence voltage, and corresponding electric current is negative-sequence current；Zcr(i)For the wave impedance of i-th section of route, γ(i)For i-th section of route
Propagation coefficient, LiFor i-th section of total track length.
Further, Zcr(i)And γ(i)Calculation formula are as follows:
Wherein, l(i)For the inductance of i-th section of route, c(i)For the capacitor of i-th section of route.
The present invention also provides a kind of computer storage medium, the computer storage medium is stored with mixed power transmission line event
Hinder the program of distance measuring method, the program of the mixed power transmission line fault distance-finding method is realized when being executed by least one processor
Mixed power transmission line fault distance-finding method the following steps are included:
(1) mixed power transmission line is divided at least twolink, keeps the type of adjacent twolink different；
(2) when a failure occurs it, from sending end to receiving end, the measurement impedance of each section of route is successively calculated, until determining failure
Locating part of path；
Wherein, in the measurement impedance that either segment route is calculated, the measurement impedance and the overall length of this section of route are hindered
It is anti-to compare, if measurement impedance is less than or equal to overall length impedance, it is determined that failure is in this section of route；If measurement impedance is greater than
Overall length impedance then calculates the measurement impedance of next section of route；Wherein, when calculating the measurement impedance of first segment route, according to inspection
The measurement impedance of first segment route is calculated in the voltage and current data of the first segment route head end measured；Continue after computation each
When the measurement impedance of section route, according to the voltage and current data of the last period route head end and the wave impedance of the last period route and
The voltage and current data of this section of route head end are calculated in propagation coefficient, then, according to the voltage and electricity of this section of route head end
Flow data calculates the measurement impedance of this section of route；
(3) the measurement impedance of the part of path according to locating for failure carries out the fault localization of mixed power transmission line.
The measurement impedance of each section of route in mixed power transmission line is individually calculated, when there is no in the section for failure
When in route, according to the pass between the voltage and current data of this section of route head end and the voltage and current data of next section of route head end
The voltage and current data of next section of route head end are calculated in system, then calculate the measurement impedance of next section of route, and so on,
Until the corresponding measurement impedance of a certain section of route occur is less than or equal to the corresponding impedance of this section of total track length, then, energy
Guilty culprit route is accessed, the fault localization of mixed power transmission line is carried out according to obtained measurement impedance.Therefore, regardless of mixing
There are what kind of difference between each section of route in transmission line of electricity, which is divided mixed power transmission line
Section, breaks the whole up into parts, and the difference between route just no longer influences the calculating of measurement impedance, then, the computer storage medium energy
The accurate positionin for enough realizing failure, compared to traditional fault distance-finding method, which applies transmits electricity in mixing
Fault localization precision can be significantly promoted in route, reduce fault localization error.
Further, in order to improve each section of route head end voltage and current data accuracy, according to i-th section of route head end
Voltage and current data and the wave impedance and propagation coefficient of i-th section of route the voltage of i+1 section route head end is calculated
With the calculation formula of current data are as follows:
Wherein, i=1,2 ..., T-1, T be mixed power transmission line divide route number of segment,For i+1 section route
The voltage data of head end,For the current data of i+1 section route head end,For the voltage data of i-th section of route head end,For the current data of i-th section of route head end, P=0,1,2, as P=0, corresponding voltage is residual voltage, corresponding electricity
Stream is zero-sequence current；As P=1, corresponding voltage is positive sequence voltage, and corresponding electric current is forward-order current；It is corresponding as P=2
Voltage be negative sequence voltage, corresponding electric current be negative-sequence current；Zcr(i)For the wave impedance of i-th section of route, γ(i)For i-th section of route
Propagation coefficient, LiFor i-th section of total track length.
Further, Zcr(i)And γ(i)Calculation formula are as follows:
Wherein, l(i)For the inductance of i-th section of route, c(i)For the capacitor of i-th section of route.
Detailed description of the invention
Fig. 1 is a kind of specific embodiment structure chart of mixed power transmission line provided by the invention；
Fig. 2 is a kind of specific embodiment flow chart of mixed power transmission line fault distance-finding method provided by the invention.
Specific embodiment
Mixed power transmission line fault distance-finding method embodiment:
The present embodiment provides a kind of mixed power transmission line fault distance-finding method, applicable object is mixed power transmission line, one
As in the case of, mixed power transmission line be overhead line-cable mixed power transmission line, certainly, mixed power transmission line can also be by
Other at least two different types of circuits are constituted.In the present embodiment, mixed power transmission line is with overhead line-cable mixing transmission of electricity
It is illustrated for route.
Mixed power transmission line fault distance-finding method the following steps are included:
Firstly, mixed power transmission line is divided at least twolink, keep the type of adjacent twolink different.Therefore,
In the present embodiment, mixed power transmission line includes an at least segment frame ceases to be busy and at least one section of cable, the tool of overhead line and cable
Body number is not construed as limiting, and overhead line and cable are staggered, i.e., if the part of path for not considering mixed power transmission line both ends, two
One section of cable is set between segment frame ceases to be busy, a segment frame ceases to be busy is set between two sections of cables.It sets in mixed power transmission line
The number of sectionalized line be T, from sending end to receiving end, by each section of route in mixed power transmission line successively be known as first segment route,
Second segment route ..., i-th section of route, i+1 section route ..., T sections of routes.
Then, due in the calculating of the voltage and current data of other subsequent each section of route head end in addition to first segment route
Need to use the wave impedance and propagation coefficient (also referred to as propagation constant) of the last period route, then, first illustrate here wave impedance and
Propagation coefficient.
For a certain section of route, the wave impedance of this section of route is calculated using the route actual parameter of this section of route and propagates system
Number.Positive sequence wave impedance, positive sequence propagation coefficient, zero sequence wave impedance and zero sequence due to needing to use this section of route in subsequent process pass
Coefficient is broadcast, then just needing to calculate the positive sequence wave impedance of this section of route, positive sequence propagation coefficient, zero sequence wave using route actual parameter
Impedance and zero sequence propagation coefficient.Route actual parameter includes the positive sequence impedance Z of this section of route1, positive sequence impedance fineness angleZero sequence
Impedance Z0, zero sequence impedance fineness anglePositive sequence capacitive reactance Zc1, zero sequence capacitive reactance Zc0And the length L etc. of this section of route.Above-mentioned ginseng
Number belongs to the known parameters of route, is obtained by transmission line construction department by testing route actual measurement.That is, should
The parameter being related in the wave impedance of section route and the calculating process of propagation coefficient is known parameters, the characteristic with route itself
It is related, then, overhead line and the relevant parameter in cable may due to line characteristic difference value it is different.
Wave impedance and the calculation formula of propagation coefficient are as follows:
Wherein, ZcrBe respectively wave impedance and propagation coefficient with γ, r, l, g, c be respectively the resistance of route, inductance, conductance and
Capacitor, under normal circumstances, this four parameters are the correspondence parameter of every kilometer of route.
For high-tension line, there is r to be much smaller than ω c much smaller than ω l, g, therefore can be to wave impedance ZcrWith propagation coefficient γ do as
Lower simplification:
In above formula, when l and c takes positive sequence inductance l1With positive sequence capacitor c1When, positive sequence wave impedance Z can be obtainedcr1It is propagated with positive sequence and is
Number γ1, l1And c1It can be directly given numerical value, can also be calculated and be obtained by route actual parameter, calculation formula is as follows:
c1=2 π f*Zc1*L
When l and c take zero sequence inductance l0With zero sequence capacitor c0When, zero sequence wave impedance Z can be obtainedcr0With zero sequence propagation coefficient γ0, l0
And c0It can be directly given numerical value, can also be calculated and be obtained by route actual parameter, calculation formula is as follows:
c0=2 π f*Zc0*L
Wherein, f is work frequency 50HZ.
So, for i-th section of route, regardless of i-th section of route is overhead line or cable, wave impedance and propagation coefficient
Calculation formula it is as follows, difference be the parameter value in calculation formula difference.
Wherein, Zcr(i)For the wave impedance of i-th section of route, γ(i)For the propagation coefficient of i-th section of route, l(i)For i-th section of route
Inductance, c(i)For the capacitor of i-th section of route.
So, positive sequence wave impedance and positive sequence propagation coefficient and zero sequence wave impedance and zero sequence propagation coefficient according to giving above
Calculation formula out is calculated, and the parameter being directed to is related to i-th section of route.
When a failure occurs it, it (is originated according to voltage detection device and current detecting equipment acquisition first segment route head end
End) voltage and current data, voltage and current data be can be calculated measure impedance relevant voltage and current number
According to, here, including phase voltage, phase current, voltage between phases and three-phase current, it is denoted as respectivelyWithTogether
Shi Liyong positive-sequence component method calculates zero sequence, positive sequence, negative sequence voltage and electric current, voltage and is denoted asElectric current is denoted asP=0,1,
2, as P=0, corresponding voltage is residual voltage, and corresponding electric current is zero-sequence current；As P=1, corresponding voltage is positive
Sequence voltage, corresponding electric current are forward-order current；As P=2, corresponding voltage is negative sequence voltage, and corresponding electric current is negative phase-sequence electricity
Stream.
The measurement impedance that first segment route is calculated according to the voltage and current data of first segment route head end, obtains the first survey
Measure impedance Z x1.
If Zx1 > Z11, wherein Z11 is first segment total track length L1Corresponding impedance (the i.e. overall length resistance of first segment route
It is anti-), specifically positive sequence impedance, indicate failure in first segment route, then, according to the voltage of first segment route head end with
The wave impedance Z of current data and first segment routecr(1)With propagation coefficient γ(1)The voltage of second segment route head end is calculated
And current dataCalculation formula is as follows:
Wherein, if the positive sequence voltage and electric current and negative sequence voltage and electric current of calculating second segment route head end, use
Following calculation formula:
Wherein, P=1,2, Zcr1(1)For the positive sequence wave impedance of first segment route, γ1(1)It is propagated for the positive sequence of first segment route
Coefficient.
If calculating the residual voltage and electric current of second segment route head end, following calculation formula is used:
Wherein, Zcr0(1)For the zero sequence wave impedance of first segment route, γ0(1)For the zero sequence propagation coefficient of first segment route.
Therefore, the voltage and current data that second segment route head end can be obtained by above-mentioned calculation formula, be specifically
To the positive sequence of second segment route head end, negative phase-sequence, residual voltage and electric current, second segment route head end can be obtained using positive-sequence component method
Each phase voltage and electric current.
The measurement impedance that second segment route is calculated according to the voltage and current data of second segment route head end, obtains the second survey
Measure impedance Z x2.
If Zx2≤Z21, indicate that failure occurs in second segment route, fault distance is calculated according to the second measurement impedance Z x2
Lx2, calculation formula are as follows:
Wherein, Z21 is second segment total track length L2Corresponding impedance, specifically positive sequence impedance.
So, physical fault distance lx=L1+lx2。
If Zx2 > Z21, failure is indicated not in second segment route, then according to the voltage and electricity of second segment route head end
The wave impedance Z of flow data and second segment routecr(2)With propagation coefficient γ(2)Be calculated third section route head end voltage and
Current dataWith calculate second segment route head end voltage and current data similarly, calculation formula is as follows:
Wherein, if the positive sequence voltage and electric current and negative sequence voltage and electric current of calculating third section route head end, use
Following calculation formula:
Wherein, P=1,2, Zcr1(2)For the positive sequence wave impedance of second segment route, γ1(2)It is propagated for the positive sequence of second segment route
Coefficient.
If calculating the residual voltage and electric current of third section route head end, following calculation formula is used:
Wherein, Zcr0(2)For the zero sequence wave impedance of second segment route, γ0(2)For the zero sequence propagation coefficient of second segment route.
Therefore, the voltage and current data that third section route head end can be obtained by above-mentioned calculation formula, be specifically
To positive sequence, negative phase-sequence, residual voltage and the electric current of third section route head end, third section route head end can be obtained using positive-sequence component method
Each phase voltage and electric current.
The measurement impedance that third section route is calculated according to the voltage and current data of third section route head end obtains third survey
Measure impedance Z x3.If Zx3≤Z31, indicate failure occur in third section route, according to third measure impedance Z x3 calculate failure away from
From lx3, calculation formula is as follows:
Wherein, Z31 is third section total track length L3Corresponding impedance, specifically positive sequence impedance.
So, physical fault distance lx=L1+L2+lx3。
If Zx3 > Z31, failure is indicated not in third section route, then according to the voltage and electricity of third section route head end
The wave impedance Z of flow data and third section routecr(3)With propagation coefficient γ(3)Be calculated the 4th section of route head end voltage and
Current data, similarly with the voltage and current data of calculating third section route head end among the above.
Then, the measurement of the 4th section of route is calculated according to the voltage and current data for the 4th section of route head end being calculated
Impedance, and carry out subsequent comparison.
And so on.
Therefore, for i-th section of route, if the corresponding i-th measurement impedance of i-th section of route is greater than i-th section of total track length and corresponds to
Impedance, then calculated according to the wave impedance and propagation coefficient of the voltage and current data of i-th section of route head end and i-th section of route
The voltage and current data of i+1 section route head end are obtained, calculation formula is as follows:
Wherein, here due to there are i+1, the value of the i in the formula be i=1,2 ..., T-1；It is
The voltage data of i+1 sections of route head ends,For the current data of i+1 section route head end,For the electricity of i-th section of route head end
Press data,For the current data of i-th section of route head end, Zcr(i)For the wave impedance of i-th section of route, γ(i)For i-th section of route
Propagation coefficient, LiFor i-th section of total track length.
Of course, it is possible to be calculated according to the calculating process of the positive sequence of above-mentioned calculating route head end, negative phase-sequence, residual voltage and electric current
Obtain positive sequence, negative phase-sequence, residual voltage and the electric current of i+1 section route head end.
Then, according to the voltage and current data of i+1 section route head end be calculated i+1 section route it is corresponding i-th+
1 measurement impedance, and compare i+1 measurement impedance impedance corresponding with i+1 section total track length.Until a certain section of route is corresponding
It measures impedance and is less than or equal to the corresponding impedance of this section of total track length, determine that failure occurs in this section of route.Set failure
Occur in s sections of routes, then the calculation formula of fault distance lxs is as follows:
Wherein, Zxs is that the corresponding s of s sections of routes measures impedance, and Zs1 is s sections of total track length LsCorresponding impedance,
Specifically positive sequence impedance.
So, final physical fault distance lx=L1+L2……+Ls-1+lxs。
It can to sum up obtain, when a failure occurs it, from sending end to receiving end, successively calculate the measurement impedance of each section of route, until really
Determine part of path locating for failure；Wherein, in the measurement impedance that either segment route is calculated, by the measurement impedance and this section of line
The overall length impedance on road is compared, if measurement impedance is less than or equal to overall length impedance, it is determined that failure is in this section of route；If surveying
It measures impedance and is greater than overall length impedance, then calculate the measurement impedance of next section of route；Wherein, in the measurement impedance for calculating first segment route
When, the measurement impedance of first segment route is calculated according to the voltage and current data of the first segment route head end detected；?
When the measurement impedance of each section of route of calculated for subsequent, according to the voltage and current data and the last period route of the last period route head end
Wave impedance and propagation coefficient the voltage and current data of this section of route head end are calculated, then, according to this section of route head end
Voltage and current data calculate the measurement impedance of this section of route.
In addition, if obtaining failure except mixed power transmission line through above-mentioned calculating process, because external area error ranging is by it
The influence of its route increasing-aid current, there may be biggish errors for ranging, therefore no longer calculate fault distance in detail, only output event
Barrier is located at the result except mixed power transmission line overall length.
Below by taking the mixed power transmission line of three sections of railway superstructures as an example, a kind of application example is provided.
As shown in Figure 1, first segment route be overhead line, second segment route be cable, third section route be overhead line, three
Section route is the end M, N-terminal, the end S and the end Q respectively there are four end.The end M is the head end of first segment route, and N-terminal is second segment route
Head end, the end S are the head end of third section route.Moreover, the end M is sending end, the end Q is receiving end.
So, the voltage and current data at the end M, including phase voltage, phase current, voltage between phases and three-phase current are acquired, point
It is not denoted asWithZero sequence, positive sequence, negative sequence voltage and electric current are calculated using positive-sequence component method simultaneously,
Voltage is denoted asElectric current is denoted asP=0,1,2, as P=0, corresponding voltage is residual voltage, and corresponding electric current is zero
Sequence electric current；As P=1, corresponding voltage is positive sequence voltage, and corresponding electric current is forward-order current；As P=2, corresponding voltage
For negative sequence voltage, corresponding electric current is negative-sequence current.
After protection starting 30ms, and start ranging after trip protection after 10ms, calculates measurement impedance Z x1.According to failure
Type determines the calculation of measurement impedance Z x1: if it is single-phase fault:
Wherein, Kz is zero-utility theory, be can be calculated by positive sequence impedance and zero-sequence impedance parameter,
If it is phase-to phase fault:
Wherein, belong to single-phase fault or phase-to phase fault it is determined that must be out of order when failure occurs.
If Zx1≤Z11, fault distance isIf Zx1 > Z11, indicate failure not first
In section route, then, according to the voltage and current data at the end M and the wave impedance Z of first segment routecr(1)With propagation coefficient γ(1)
The voltage and current data of N-terminal are calculated, calculation formula is as follows:
So, if the positive sequence voltage and electric current and negative sequence voltage and electric current of calculating N-terminal, public affairs are calculated using following
Formula:
Wherein, P=1,2, Zcr1(1)For the positive sequence wave impedance of first segment route, γ1(1)It is propagated for the positive sequence of first segment route
Coefficient.
If calculating the residual voltage and electric current of N-terminal, following calculation formula is used:
Wherein, Zcr0(1)For the zero sequence wave impedance of first segment route, γ0(1)For the zero sequence propagation coefficient of first segment route.
Therefore, the voltage and current data that N-terminal can be obtained by above-mentioned calculation formula, specifically obtain N-terminal positive sequence,
Negative phase-sequence, residual voltage and electric current can obtain each phase voltage and electric current of N-terminal using positive-sequence component method.
The measurement impedance that second segment route is calculated according to the voltage and current data of second segment route head end, obtains the second survey
Measure impedance Z x2.If Zx2≤Z21, indicate that failure occurs in second segment route, as shown in Figure 1, according to the second measurement impedance Z x2
Fault distance lx2 is calculated, calculation formula is as follows:
Wherein, Z21 is second segment total track length L2Corresponding impedance, specifically positive sequence impedance.
So, physical fault distance lx=L1+lx2。
If Zx2 > Z21, failure is indicated not in second segment route, then according to the voltage and current data of N-terminal and the
The wave impedance Z of two sections of routescr(2)With propagation coefficient γ(2)The voltage and current data at the end S are calculated, with the voltage for calculating N-terminal
Similarly with current data.
The measurement impedance that third section route is calculated according to the voltage and current data at the end S obtains third measurement impedance Z x3.
If Zx3≤Z31, indicate that failure occurs in third section route, impedance Z x3 is measured according to third and calculates fault distance lx3, is calculated
Formula is as follows:
Wherein, Z31 is third section total track length L3Corresponding impedance, specifically positive sequence impedance.
So, physical fault distance lx=L1+L2+lx3。
Fault localization process is as shown in Figure 2.
In above-described embodiment, the wave impedance of each section of route and the calculating process of propagation coefficient can be in the measurements of each section of route
It is fully completed before impedance computation and comparison, it can also be when the wave impedance and propagation coefficient for needing to use which section route
Calculate the wave impedance and propagation coefficient of this section of route, such as: calculate second segment route head end voltage and current data when
The wave impedance and propagation coefficient for just calculating first segment route are waited, in the subsequent voltage and current data for calculating third section route head end
When just calculate the wave impedance and propagation coefficient etc. of second segment route.Moreover, the measurement impedance of each section of route can be prior
The comparison and fault location process for just carrying out subsequent measurement impedance after completing are calculated, can also need to use that section of line
The measurement impedance of this section of route is calculated when the measurement impedance on road, such as: after determining failure there is no in first segment route
The measurement impedance for just calculating second segment route, alternatively, just calculating third after determining failure there is no in second segment route
The measurement impedance etc. of section route.
In above-described embodiment, the calculation that measurement impedance is calculated according to voltage and current data is given, due to measurement
The calculation of impedance belongs to the prior art, therefore, the calculation during the present invention is not limited to the above embodiments.
Specific embodiment is presented above, but the present invention is not limited to described embodiment.Base of the invention
This thinking is mixed power transmission line fault distance-finding method, and does not lie in the mixing power transmission line that the fault distance-finding method is applicable in
Road, on the basis of using the fault distance-finding method, any mixed power transmission line is within the scope of the invention.It is not taking off
The change, modification, replacement and modification carried out in the case where from the principle and spirit of the invention to embodiment still fall within the present invention
Protection scope in.
Mixed power transmission line fault location device embodiment:
The present embodiment provides a kind of mixed power transmission line fault location device, including memory, processor and it is stored in
In memory and the computer program that can run on a processor, processor realize mixing power transmission line when executing computer program
Mixed power transmission line fault distance-finding method in the fault distance-finding method embodiment of road, specifically repeats no more.
Computer storage medium embodiment:
The present embodiment provides a kind of computer storage medium, which is stored with mixed power transmission line failure
The program of distance measuring method is realized when the program of the mixed power transmission line fault distance-finding method is executed by least one processor and is mixed
Mixed power transmission line fault distance-finding method in fault positioning method for transmission line embodiment, specifically repeats no more.
It should be understood by those skilled in the art that, embodiments herein can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the application
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the application, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The application is referring to method, the process of equipment (system) and computer program product according to the embodiment of the present application
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Claims (9)
1. a kind of mixed power transmission line fault distance-finding method, which comprises the following steps:
(1) mixed power transmission line is divided at least twolink, keeps the type of adjacent twolink different；
(2) when a failure occurs it, from sending end to receiving end, the measurement impedance of each section of route is successively calculated, until determining locating for failure
Part of path；
Wherein, in the measurement impedance that either segment route is calculated, by the overall length impedance phase of the measurement impedance and this section of route
Than if measurement impedance is less than or equal to overall length impedance, it is determined that failure is in this section of route；If measuring impedance is greater than overall length
Impedance then calculates the measurement impedance of next section of route；Wherein, when calculating the measurement impedance of first segment route, according to detecting
The voltage and current data of first segment route head end the measurement impedance of first segment route is calculated；Continue each section of line after computation
When the measurement impedance on road, according to the voltage and current data of the last period route head end and the wave impedance and propagation of the last period route
The voltage and current data of this section of route head end are calculated in coefficient, then, according to the voltage and current number of this section of route head end
According to the measurement impedance for calculating this section of route；
(3) the measurement impedance of the part of path according to locating for failure carries out the fault localization of mixed power transmission line.
2. mixed power transmission line fault distance-finding method according to claim 1, which is characterized in that according to i-th section of route head
The electricity of i+1 section route head end is calculated in the wave impedance and propagation coefficient of the voltage and current data at end and i-th section of route
The calculation formula of pressure and current data are as follows:
Wherein, i=1,2 ..., T-1, T be mixed power transmission line divide route number of segment,For i+1 section route head end
Voltage data,For the current data of i+1 section route head end,For the voltage data of i-th section of route head end,For
The current data of i-th section of route head end, P=0,1,2, as P=0, corresponding voltage is residual voltage, and corresponding electric current is zero
Sequence electric current；As P=1, corresponding voltage is positive sequence voltage, and corresponding electric current is forward-order current；As P=2, corresponding voltage
For negative sequence voltage, corresponding electric current is negative-sequence current；Zcr(i)For the wave impedance of i-th section of route, γ(i)For the propagation of i-th section of route
Coefficient, LiFor i-th section of total track length.
3. mixed power transmission line fault distance-finding method according to claim 2, which is characterized in that Zcr(i)And γ(i)Calculating
Formula are as follows:
Wherein, l(i)For the inductance of i-th section of route, c(i)For the capacitor of i-th section of route.
4. a kind of mixed power transmission line fault location device, including memory, processor and storage are in the memory simultaneously
The computer program that can be run on a processor, which is characterized in that the processor is realized when executing the computer program
Mixed power transmission line fault distance-finding method the following steps are included:
(1) mixed power transmission line is divided at least twolink, keeps the type of adjacent twolink different；
(2) when a failure occurs it, from sending end to receiving end, the measurement impedance of each section of route is successively calculated, until determining locating for failure
Part of path；
Wherein, in the measurement impedance that either segment route is calculated, by the overall length impedance phase of the measurement impedance and this section of route
Than if measurement impedance is less than or equal to overall length impedance, it is determined that failure is in this section of route；If measuring impedance is greater than overall length
Impedance then calculates the measurement impedance of next section of route；Wherein, when calculating the measurement impedance of first segment route, according to detecting
The voltage and current data of first segment route head end the measurement impedance of first segment route is calculated；Continue each section of line after computation
When the measurement impedance on road, according to the voltage and current data of the last period route head end and the wave impedance and propagation of the last period route
The voltage and current data of this section of route head end are calculated in coefficient, then, according to the voltage and current number of this section of route head end
According to the measurement impedance for calculating this section of route；
(3) the measurement impedance of the part of path according to locating for failure carries out the fault localization of mixed power transmission line.
5. mixed power transmission line fault location device according to claim 4, which is characterized in that according to i-th section of route head
The electricity of i+1 section route head end is calculated in the wave impedance and propagation coefficient of the voltage and current data at end and i-th section of route
The calculation formula of pressure and current data are as follows:
Wherein, i=1,2 ..., T-1, T be mixed power transmission line divide route number of segment,For i+1 section route head end
Voltage data,For the current data of i+1 section route head end,For the voltage data of i-th section of route head end,It is i-th
The current data of section route head end, P=0,1,2, as P=0, corresponding voltage is residual voltage, and corresponding electric current is zero sequence
Electric current；As P=1, corresponding voltage is positive sequence voltage, and corresponding electric current is forward-order current；As P=2, corresponding voltage is
Negative sequence voltage, corresponding electric current are negative-sequence current；Zcr(i)For the wave impedance of i-th section of route, γ(i)For the propagation system of i-th section of route
Number, LiFor i-th section of total track length.
6. mixed power transmission line fault location device according to claim 5, which is characterized in that Zcr(i)And γ(i)Calculating
Formula are as follows:
Wherein, l(i)For the inductance of i-th section of route, c(i)For the capacitor of i-th section of route.
7. a kind of computer storage medium, which is characterized in that the computer storage medium is stored with mixed power transmission line failure
The program of distance measuring method, what the program of the mixed power transmission line fault distance-finding method was realized when being executed by least one processor
Mixed power transmission line fault distance-finding method the following steps are included:
(1) mixed power transmission line is divided at least twolink, keeps the type of adjacent twolink different；
(2) when a failure occurs it, from sending end to receiving end, the measurement impedance of each section of route is successively calculated, until determining locating for failure
Part of path；
Wherein, in the measurement impedance that either segment route is calculated, by the overall length impedance phase of the measurement impedance and this section of route
Than if measurement impedance is less than or equal to overall length impedance, it is determined that failure is in this section of route；If measuring impedance is greater than overall length
Impedance then calculates the measurement impedance of next section of route；Wherein, when calculating the measurement impedance of first segment route, according to detecting
The voltage and current data of first segment route head end the measurement impedance of first segment route is calculated；Continue each section of line after computation
When the measurement impedance on road, according to the voltage and current data of the last period route head end and the wave impedance and propagation of the last period route
The voltage and current data of this section of route head end are calculated in coefficient, then, according to the voltage and current number of this section of route head end
According to the measurement impedance for calculating this section of route；
(3) the measurement impedance of the part of path according to locating for failure carries out the fault localization of mixed power transmission line.
8. computer storage medium according to claim 7, which is characterized in that according to the voltage of i-th section of route head end and
The voltage and current number of i+1 section route head end is calculated in the wave impedance and propagation coefficient of current data and i-th section of route
According to calculation formula are as follows:
Wherein, i=1,2 ..., T-1, T be mixed power transmission line divide route number of segment,For i+1 section route head end
Voltage data,For the current data of i+1 section route head end,For the voltage data of i-th section of route head end,It is i-th
The current data of section route head end, P=0,1,2, as P=0, corresponding voltage is residual voltage, and corresponding electric current is zero sequence
Electric current；As P=1, corresponding voltage is positive sequence voltage, and corresponding electric current is forward-order current；As P=2, corresponding voltage is
Negative sequence voltage, corresponding electric current are negative-sequence current；Zcr(i)For the wave impedance of i-th section of route, γ(i)For the propagation system of i-th section of route
Number, LiFor i-th section of total track length.
9. computer storage medium according to claim 8, which is characterized in that Zcr(i)And γ(i)Calculation formula are as follows:
Wherein, l(i)For the inductance of i-th section of route, c(i)For the capacitor of i-th section of route.
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