CN102967799B - Comprehensive fault distance measuring method for electric power system - Google Patents

Abstract

The invention relates to a comprehensive fault distance measuring method for an electric power system. The method comprises the following steps of: (1) respectively acquiring traveling wave signals by data acquisition devices which are arranged in transformer stations on two sides of an electric transmission line, and determining the distance between fault points by adopting a double-end traveling wave distance measuring method; (2) respectively acquiring voltage/current information of two ends of the electric transmission line by the data acquisition devices which are arranged in the transformer stations on two sides of the electric transmission line, and determining the distance between the fault points by adopting a single-end and double-end fault analysis method; and (3)comprehensively judging the distance measuring result of the traveling wave distance measuring method and the distance measuring result of the fault analysis method to realize accurate positioning on faults of the electric transmission line. The comprehensive fault distance measuring method has high stability, high reliability and high accuracy. Under the condition that the double-end traveling wave distance measuring method is effective, the single-end and double-end fault analysis method is used for screening out the only traveling wave distance measuring result, so that interferences of reflected traveling waves and refracted traveling waves are effectively avoided; and under the condition that the double-end traveling wave distance measuring method fails, the single-end and double-end fault analysis method is used for finishing the fault distance measuring, so that the reliability of fault distance measuring positioning of the electric transmission line is significantly improved.

Description

A kind of electric power system fault hybrid ranging method

Technical field

The present invention relates to range finding, particularly relate to a kind of electric power system fault hybrid ranging method.

Background technology

Existing fault positioning method for transmission line comprises fault analytical method and travelling wave ranging method.

Fault analytical method divides one-end fault analytic approach and both-end fault analytical method.One-end fault analytic approach adopts single ended voltage/current data to calculate fault impedance, and then obtains fault distance, and the method is by the impact of the factors such as transition resistance, and distance accuracy is poor.Both-end fault analytical method utilizes both-end voltage/current data to calculate fault distance, and affect by factors such as transition resistances and be less than one-end fault analytic approach, distance accuracy higher than one-end fault analytic approach, but need gather both-end electric data.

Travelling wave ranging method is the localization method realized according to theory of travelling wave.When transmission line of electricity breaks down, trouble spot produces transient voltage and current break signal and voltage traveling wave and current traveling wave signal, propagate along power circuit to circuit both sides electrical network with certain speed, the mistiming utilizing trouble spot travelling wave signal to arrive circuit both sides can calculate fault distance.Travelling wave ranging method is divided into Single Ended Fault Location and both-end travelling wave ranging method.The mistiming that Single Ended Fault Location utilizes row ripple to propagate between trouble spot and transformer station realizes fault localization; The mistiming that both-end travelling wave ranging method utilizes trouble spot row ripple to arrive transmission line of electricity both sides realizes fault localization.Single Ended Fault Location and both-end travelling wave ranging method affect less by the factor such as system operation mode, transition resistance, and distance accuracy is better than single-ended impedance telemetry and both-end impedance method.But the range finding of single-ended traveling wave method is very easily by reflected traveling wave and the interference reflecting row ripple, often need artificially to participate in breakdown judge, practicality is poor, and Single Ended Fault Location and both-end travelling wave ranging method are when fault traveling wave signal is too faint or fault traveling wave life period is too short, row wave datum harvester does not collect travelling wave signal, causes finding range unsuccessfully.

Summary of the invention

Technical matters to be solved by this invention is the defect making up above-mentioned prior art, provides a kind of electric power system fault hybrid ranging method.

Technical matters of the present invention is solved by the following technical programs.

This electric power system fault hybrid ranging method, the data collector that the transformer station of the data collector arranged by the transformer station of transmission line of electricity side and transmission line of electricity opposite side is arranged completes fault localization jointly automatically.

The feature of this electric power system fault hybrid ranging method is:

When there is trouble spot in transmission line of electricity, comprise the following steps:

1) data collector of transformer station's setting of the data collector arranged by the transformer station of transmission line of electricity side and transmission line of electricity opposite side, gather travelling wave signal respectively, both-end travelling wave ranging method is adopted to identify the moment that travelling wave signal arrives the transformer station of transmission line of electricity side and the transformer station of transmission line of electricity opposite side respectively, with the distance between the transformer station determining described trouble spot and described transmission line of electricity side, its computing formula is as follows:

$L_M=\frac{L+(t_m-t_n)\×v}{2}...\left(1\right)$

In formula (1):

L _mfor the distance between trouble spot and the transformer station M of transmission line of electricity side;

L is transmission line of electricity total length, the distance namely between the transformer station M of transmission line of electricity side and the transformer station N of transmission line of electricity opposite side;

V is the velocity of propagation of row ripple on transmission line of electricity;

T _mthe moment of the transformer station M of transmission line of electricity side is arrived for row ripple;

T _nthe moment of the transformer station N of transmission line of electricity opposite side is arrived for row ripple;

2) data collector of transformer station's setting of the data collector arranged by the transformer station of transmission line of electricity side and transmission line of electricity opposite side, gather transmission line of electricity both end voltage/current information respectively, utilize one-end fault analytic approach and both-end fault analytical method to calculate trouble spot distance.

3) range measurement of Comprehensive Evaluation travelling wave ranging method and the range measurement of fault analytical method, realizes the accurate location of transmission line malfunction.

Technical matters of the present invention is solved by following further technical scheme.

Described step 1) gather travelling wave signal, its mode comprises high speed acquisition voltage/current information, directly gathers travelling wave signal, and when employing directly gathers travelling wave signal mode, travelling wave signal can from primary equipment ground wire or special traveling wave sensor.

Described step 1) differentiate that travelling wave signal arrives the moment of transformer station, be adopt mathematical method to differentiate row ripple, the voltage/current information utilizing wavelet transformation mathematical method analysis row wave datum harvester to gather, finally identifies the capable ripple due in of voltage/current.

Described step 1) differentiate that travelling wave signal arrives the moment of transformer station, be adopt hardware circuit to differentiate row ripple, the voltage/current travelling wave signal gathered by proprietary hardware circuit analysis row wave datum harvester, finally identifies the capable ripple due in of voltage/current.

Described step 1) both-end travelling wave ranging method range finding adopt high precision pair time, when being GPS (Global Positioning System, initialism is GPS) pair during described high precision pair and dipper system pair time in one.

Described step 1) transmission line of electricity side transformer station arrange data collector and step 2) transmission line of electricity side transformer station arrange data collector, be same set of data collector.

Described step 1) transmission line of electricity opposite side transformer station arrange data collector and step 2) transmission line of electricity opposite side transformer station arrange data collector, be same set of data collector.

Described step 1) transmission line of electricity side transformer station arrange data collector and step 2) transmission line of electricity side transformer station arrange data collector, be not same set of data collector.

Described step 1) transmission line of electricity opposite side transformer station arrange data collector and step 2) transmission line of electricity opposite side transformer station arrange data collector, be not same set of data collector.

Described step 2) one-end fault analytic approach comprise impedance method and single-ended line to line fault impedance method single-end earthed, when trouble spot single-phase earthing or three-phase ground, adopt impedance method single-end earthed to measure the fault distance between trouble spot and the transformer station of transmission line of electricity side, its computing formula is as follows:

$L_M=\frac{U_{\mathrm{mf}}}{(I_{\mathrm{mf}}+k\×{3I}_0)\×z_1}...\left(2\right)$

In formula (2):

L _mfor the distance between trouble spot and the transformer station M of transmission line of electricity side;

Z ₁for transmission line of electricity unit length positive sequence impedance.

U _mffor the faulted phase voltage phasor value of the transformer station M of transmission line of electricity side;

I _mffor the faulted phase current phasor value of the transformer station M of transmission line of electricity side;

K is zero sequence current compensation factor;

3I ₀for the transformer station M zero-sequence current of transmission line of electricity side;

When trouble spot line to line fault or line to line fault ground connection or three-phase shortcircuit, adopt single-ended line to line fault impedance method to measure distance between trouble spot and the transformer station of transmission line of electricity side, its computing formula is as follows:

$L_M=\frac{U_{\mathrm{mf}1}-U_{\mathrm{mf}2}}{(I_{\mathrm{mf}1}-I_{\mathrm{mf}2})\×z_1}...\left(3\right)$

In formula (3):

L _mfor the distance between trouble spot and the transformer station M of transmission line of electricity side;

Z ₁for transmission line of electricity unit length positive sequence impedance;

U _mf1for the voltage phasor value of the two-phase short-circuit fault phase 1 of the transformer station M of transmission line of electricity side;

U _mf2for the voltage phasor value of the two-phase short-circuit fault phase 2 of the transformer station M of transmission line of electricity side;

I _mf1for the current phasor value of the two-phase short-circuit fault phase 1 of the transformer station M of transmission line of electricity side;

I _mf2for the current phasor value of the two-phase short-circuit fault phase 2 of the transformer station M of transmission line of electricity side.

Described step 2) both-end fault analytical method comprise power frequency positive sequence double-end distance measurement method and power frequency negative phase-sequence double-end distance measurement method, adopt power frequency positive sequence double-end distance measurement method to measure the computing formula of transmission line malfunction distance as follows:

|U _m1ch(γ ₁L _M)+I _m1Z _c1sh(γ ₁L _M)|＝|U _n1ch(γ ₁(L-L _M))+I _n1Z _c1sh(γ ₁(L-L _M))|............(4)

In formula (4):

L _mfor the distance between trouble spot and the transformer station M of transmission line of electricity side;

L is transmission line of electricity total length;

Z _c1for electric transmission line positive sequence wave impedance;

γ ₁for positive sequence propagation constant;

U _m1for the transformer station M positive sequence voltage of transmission line of electricity side;

U _n1for the transformer station N positive sequence voltage of transmission line of electricity opposite side;

I _m1for the transformer station M forward-order current of transmission line of electricity side;

I _n1for the transformer station N forward-order current of transmission line of electricity opposite side.

Adopt the computing formula of power frequency negative phase-sequence double-end distance measurement method measurement transmission line malfunction distance as follows:

|U _m2ch(γ ₂L _M)+I _m2Z _c2sh(γ ₂L _M)|＝|U _n2ch(γ ₂(L-L _M))+I _n2Z _c2sh(γ ₂(L-L _M))|............(5)

In formula (5):

L _mfor the distance between trouble spot and the transformer station M of transmission line of electricity side;

L is transmission line of electricity total length;

Z _c2for transmission line of electricity negative phase-sequence wave impedance;

γ ₂for negative phase-sequence propagation constant;

U _m2for the transformer station M negative sequence voltage of transmission line of electricity side;

U _n2for the transformer station N negative sequence voltage of transmission line of electricity opposite side;

I _m2for the transformer station M negative-sequence current of transmission line of electricity side;

I _n2for the transformer station N negative-sequence current of transmission line of electricity opposite side.

Utilize formula (4) or formula (5) that distance between the transformer station of trouble spot and transmission line of electricity side can be calculated.

Described step 3) the range measurement of Comprehensive Evaluation travelling wave ranging method and the range measurement of fault analytical method, comprising:

If the range measurement of travelling wave ranging method and the range measurement of fault analytical method are all effective, then localization of fault adopts the range measurement of the travelling wave ranging method close with the range measurement of fault analytical method;

If the range measurement of travelling wave ranging method is effective, the range measurement of fault analytical method is invalid, then localization of fault adopts the range measurement of travelling wave ranging method;

If it is invalid that the range measurement of travelling wave ranging method has, the range measurement of fault analytical method is effective, then localization of fault adopts the range measurement of fault analytical method.

Described step 3) the range measurement of fault analytical method, be the range measurement of Comprehensive Evaluation one-end fault analytic approach and the range measurement of both-end fault analytical method.

The described range measurement of Comprehensive Evaluation one-end fault analytic approach and the range measurement of both-end fault analytical method, comprising:

If only there is one-sided electrical data, then localization of fault adopts the range measurement of one-end fault analytic approach;

If the range measurement of one-end fault analytic approach is in district, the range measurement of both-end fault analytical method is outside district, then localization of fault adopts the range measurement of one-end fault analytic approach;

If the range measurement of one-end fault analytic approach is in district, the range measurement of both-end fault analytical method is in district, then localization of fault adopts the range measurement of both-end fault analytical method;

If the range measurement of one-end fault analytic approach is outside district, the range measurement of both-end fault analytical method is outside district, then localization of fault adopts the range measurement of both-end fault analytical method;

If the range measurement of one-end fault analytic approach is outside district, the range measurement of both-end fault analytical method is in district, then localization of fault adopts the range measurement of both-end fault analytical method.

The present invention's beneficial effect is compared with prior art:

The double advantage of getting one-end fault analytic approach, both-end fault analytical method and both-end travelling wave ranging method of the inventive method, good stability, reliability and precision high, reliably, accurately can realize transmission open acess.Under both-end travelling wave ranging method finds range effective situation, employing one-end fault analytic approach, both-end fault analytical method filter out unique travelling wave ranging result, effectively to avoid the interference of reflected traveling wave and refraction row ripple; When the travelling wave ranging failure of both-end travelling wave ranging method, employing one-end fault analytic approach, both-end fault analytical method complete fault localization, significantly improve the reliability of measuring distance of transmission line fault location.

Accompanying drawing explanation

Accompanying drawing is data collector and the correlated variables schematic diagram of the specific embodiment of the invention.

In figure: F is failure point of power transmission line; L _mfor the distance of trouble spot distance transformer station M, L is transmission line of electricity total length, the distance namely between transformer station M and transformer station N.

Embodiment

Contrast accompanying drawing below in conjunction with embodiment the present invention will be described.

A kind of electric power system fault hybrid ranging method, be that the data collector that the transformer station M of the transmission line of electricity both sides of 300km and transformer station N are arranged completes fault localization jointly automatically by total length L as shown in drawings, the A phase earth fault of transmission line of electricity and the distance of transformer station M are assumed to be 50km.

This embodiment, comprises the following steps:

1) data collector arranged by transmission line of electricity both sides transformer station gathers travelling wave signal and identifies travelling wave signal due in, gather row ripple and comprise high speed acquisition voltage/current information, direct collection is from the travelling wave signal of primary equipment ground wire or special traveling wave sensor, differentiate that travelling wave signal arrives the moment of transformer station, adopt mathematical method to differentiate row ripple, wavelet transformation mathematical method is utilized to analyze the voltage/current information of row wave datum harvester collection, finally identify the capable ripple due in of voltage/current, or adopt hardware circuit to differentiate row ripple, the voltage/current travelling wave signal of row wave datum harvester collection is analyzed by proprietary hardware circuit, finally identify the capable ripple due in of voltage/current, and when adopting global position system GPS pair or dipper system high precision pair time, distance between the transformer station being determined described trouble spot and described transmission line of electricity side by both-end travelling wave ranging method, its computing formula is as follows:

$L_M=\frac{L+(t_m-t_n)\×v}{2}...\left(1\right)$

In formula (1):

L _mfor the distance between trouble spot and transformer station M;

L is transmission line of electricity total length 300km;

V is the velocity of propagation 298m/ μ s of row ripple on transmission line of electricity;

T _mfor row ripple arrives the moment of transformer station M;

T _nfor row ripple arrives the moment of transformer station N;

The range measurement adopting both-end travelling wave ranging method actual computation to go out may have multiple, and one of them range measurement is: the distance between trouble spot and transformer station M is 50.5km, and the distance between trouble spot and transformer station N is 290.3km;

2) data collector of transformer station's setting of the data collector arranged by the transformer station of transmission line of electricity side and transmission line of electricity opposite side, gather transmission line of electricity both end voltage/current information respectively, utilize one-end fault analytic approach and both-end fault analytical method to calculate trouble spot distance;

Adopt impedance method single-end earthed to measure the fault distance between trouble spot and the transformer station of transmission line of electricity side, its computing formula is as follows:

$L_M=\frac{U_{\mathrm{mf}}}{(I_{\mathrm{mf}}+k\×{3I}_0)\×z_1}...\left(2\right)$

In formula (2):

L _mfor the distance between trouble spot and the transformer station M of transmission line of electricity side;

Z ₁for transmission line of electricity unit length positive sequence impedance.

U _mffor the faulted phase voltage phasor value of the transformer station M of transmission line of electricity side;

I _mffor the faulted phase current phasor value of the transformer station M of transmission line of electricity side;

K is zero sequence current compensation factor;

3I ₀for the transformer station M zero-sequence current of transmission line of electricity side;

The range measurement that impedance method actual computation goes out single-end earthed is adopted to be: the distance between trouble spot and transformer station M is 45.3km;

Both-end fault analytical method comprises power frequency positive sequence double-end distance measurement method and power frequency negative phase-sequence double-end distance measurement method, adopts the computing formula of power frequency positive sequence double-end distance measurement method measurement transmission line malfunction distance as follows:

|U _m1ch(γ ₁L _M)+I _m1Z _c1sh(γ ₁L _M)|＝|U _n1ch(γ ₁(L-L _M))+I _n1Z _c1sh(γ ₁(L-L _M))|............(4)

In formula (4):

L _mfor the distance between trouble spot and the transformer station M of transmission line of electricity side;

L is transmission line of electricity total length;

Z _c1for electric transmission line positive sequence wave impedance;

γ ₁for positive sequence propagation constant;

U _m1for the transformer station M positive sequence voltage of transmission line of electricity side;

U _n1for the transformer station N positive sequence voltage of transmission line of electricity opposite side;

I _m1for the transformer station M forward-order current of transmission line of electricity side;

I _n1for the transformer station N forward-order current of transmission line of electricity opposite side.

Adopt the computing formula of power frequency negative phase-sequence double-end distance measurement method measurement transmission line malfunction distance as follows:

|U _m2ch(γ ₂L _M)+I _m2Z _c2sh(γ ₂L _M)|＝|U _n2ch(γ ₂(L-L _M))+I _n2Z _c2sh(γ ₂(L-L _M))|............(5)

In formula (5):

L _mfor the distance between trouble spot and the transformer station M of transmission line of electricity side;

L is transmission line of electricity total length;

Z _c2for transmission line of electricity negative phase-sequence wave impedance;

γ ₂for negative phase-sequence propagation constant;

U _m2for the transformer station M negative sequence voltage of transmission line of electricity side;

U _n2for the transformer station N negative sequence voltage of transmission line of electricity opposite side;

I _m2for the transformer station M negative-sequence current of transmission line of electricity side;

I _n2for the transformer station N negative-sequence current of transmission line of electricity opposite side;

Utilize formula (4) or formula (5) can calculate distance between the transformer station of trouble spot and transmission line of electricity side, the range measurement adopting both-end fault analytical method actual computation to go out is: 48.1km;

3) range measurement of Comprehensive Evaluation travelling wave ranging method and the range measurement of fault analytical method, realizes the accurate location of transmission line malfunction;

The range measurement of Comprehensive Evaluation travelling wave ranging method and the range measurement of fault analytical method, comprising:

If the range measurement of travelling wave ranging method and the range measurement of fault analytical method are all effective, then localization of fault adopts the range measurement of the travelling wave ranging method close with the range measurement of fault analytical method;

If the range measurement of travelling wave ranging method is effective, the range measurement of fault analytical method is invalid, then localization of fault adopts the range measurement of travelling wave ranging method;

If it is invalid that the range measurement of travelling wave ranging method has, the range measurement of fault analytical method is effective, then localization of fault adopts the range measurement of fault analytical method, and the range measurement of the range measurement that Comprehensive Evaluation one-end fault is analyzed and both-end fault analytical method, comprising:

If only there is one-sided electrical data, then localization of fault adopts the range measurement of one-end fault analytic approach;

If the range measurement of one-end fault analytic approach is in district, the range measurement of both-end fault analytical method is outside district, then localization of fault adopts the range measurement of one-end fault analytic approach;

If the range measurement of one-end fault analytic approach is in district, the range measurement of both-end fault analytical method is in district, then localization of fault adopts the range measurement of both-end fault analytical method;

If the range measurement of one-end fault analytic approach is outside district, the range measurement of both-end fault analytical method is outside district, then localization of fault adopts the range measurement of both-end fault analytical method;

If the range measurement of one-end fault analytic approach is outside district, the range measurement of both-end fault analytical method is in district, then localization of fault adopts the range measurement of both-end fault analytical method.

This embodiment with adopt the localization of fault Comparative result of single one-end fault analytic approach, both-end fault analytical method, both-end travelling wave ranging method as following table 1 respectively, wherein positioning result 1 illustrates above, and positioning result 2 ~ 4 is the contrasts of other range measurement of three times.

Table 1 (unit: km)

Positioning result	1	2	3	4
					Single-ended impedance telemetry	45.3	45.3	45.3	45.3
Both-end impedance method	48.1	48.1km	Find range unsuccessfully	Find range unsuccessfully
					Both-end travelling wave ranging method	50.5、290.3	Find range unsuccessfully	Find range unsuccessfully	50.5、290.3
This embodiment	50.5	49.1	48.3	50.5

The localization of fault Comparative result of table 1 shows, the specific embodiment of the present invention fully have chosen the minimum fault localization result of one-end fault analytic approach, both-end fault analytical method, both-end travelling wave ranging method medial error, and distance accuracy and reliability are obviously better than the fault localization adopting single method.

Above content is in conjunction with concrete preferred implementation further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention; make without departing from the inventive concept of the premise and substituting or obvious modification as dried fruit is equivalent; and performance or purposes identical, all should be considered as belonging to the scope of patent protection that the present invention is determined by submitted to claims.

Claims (8)

1. an electric power system fault hybrid ranging method, the data collector that the transformer station of the data collector arranged by the transformer station of transmission line of electricity side and transmission line of electricity opposite side is arranged completes fault localization jointly automatically, it is characterized in that:

1) data collector of transformer station's setting of the data collector arranged by the transformer station of transmission line of electricity side and transmission line of electricity opposite side, gather travelling wave signal respectively, both-end travelling wave ranging method is adopted to identify the moment that travelling wave signal arrives the transformer station of transmission line of electricity side and the transformer station of transmission line of electricity opposite side respectively, with the distance between the localization of faults and the transformer station of described transmission line of electricity side, its computing formula is as follows:

$L_M=\frac{L+(t_m-t_n)\×v}{2}...\left(1\right)$

In formula (1):

L _mfor the distance between trouble spot and the transformer station M of transmission line of electricity side;

L is transmission line of electricity total length, the distance namely between the transformer station M of transmission line of electricity side and the transformer station N of transmission line of electricity opposite side;

V is the velocity of propagation of row ripple on transmission line of electricity;

T _mthe moment of the transformer station M of transmission line of electricity side is arrived for row ripple;

T _nthe moment of the transformer station N of transmission line of electricity opposite side is arrived for row ripple;

2) data collector of transformer station's setting of the data collector arranged by the transformer station of transmission line of electricity side and transmission line of electricity opposite side, gather transmission line of electricity both end voltage/current information respectively, adopt one-end fault analytic approach and both-end fault analytical method to calculate trouble spot distance;

Described one-end fault analytic approach comprises impedance method and single-ended line to line fault impedance method single-end earthed, when trouble spot single-phase earthing or three-phase ground, adopt impedance method single-end earthed to measure the fault distance between trouble spot and the transformer station of transmission line of electricity side, its computing formula is as follows:

$L_M=\frac{U_{\mathrm{mf}}}{(I_{\mathrm{mf}}+k\×{3I}_0)\×z_1}...\left(2\right)$

In formula (2):

L _mfor the distance between trouble spot and the transformer station M of transmission line of electricity side;

Z ₁for transmission line of electricity unit length positive sequence impedance;

U _mffor the faulted phase voltage phasor value of the transformer station M of transmission line of electricity side;

I _mffor the faulted phase current phasor value of the transformer station M of transmission line of electricity side;

K is zero sequence current compensation factor;

3I ₀for the transformer station M zero-sequence current of transmission line of electricity side;

When trouble spot line to line fault or line to line fault ground connection or three-phase shortcircuit, adopt single-ended line to line fault impedance method to measure distance between trouble spot and the transformer station of transmission line of electricity side, its computing formula is as follows:

$L_M=\frac{U_{\mathrm{mf}1}-U_{\mathrm{mf}2}}{(I_{\mathrm{mf}1}-I_{\mathrm{mf}2})\×z_1}---\left(3\right)$

In formula (3):

L _mfor the distance between trouble spot and the transformer station M of transmission line of electricity side;

Z ₁for transmission line of electricity unit length positive sequence impedance;

U _mf1for the voltage phasor value of the two-phase short-circuit fault phase 1 of the transformer station M of transmission line of electricity side;

U _mf2for the voltage phasor value of the two-phase short-circuit fault phase 2 of the transformer station M of transmission line of electricity side;

I _mf1for the current phasor value of the two-phase short-circuit fault phase 1 of the transformer station M of transmission line of electricity side;

I _mf2for the current phasor value of the two-phase short-circuit fault phase 2 of the transformer station M of transmission line of electricity side;

Described both-end fault analytical method comprises power frequency positive sequence double-end distance measurement method and power frequency negative phase-sequence double-end distance measurement method, adopts the computing formula of power frequency positive sequence double-end distance measurement method measurement transmission line malfunction distance as follows:

|U _m1ch(γ ₁L _M)+I _m1Z _c1sh(γ ₁L _M)|＝|U _n1ch(γ ₁(L-L _M))+I _n1Z _c1sh(γ ₁(L-L _M))|…………(4)

In formula (4):

L _mfor the distance between trouble spot and the transformer station M of transmission line of electricity side;

L is transmission line length;

Z _c1for electric transmission line positive sequence wave impedance;

γ ₁for positive sequence propagation constant;

U _m1for the transformer station M positive sequence voltage of transmission line of electricity side;

U _n1for the transformer station N positive sequence voltage of transmission line of electricity opposite side;

I _m1for the transformer station M forward-order current of transmission line of electricity side;

I _n1for the transformer station N forward-order current of transmission line of electricity opposite side;

Adopt the computing formula of power frequency negative phase-sequence double-end distance measurement method measurement transmission line malfunction distance as follows:

|U _m2ch(γ ₂L _M)+I _m2Z _c2sh(γ ₂L _M)|＝|U _n2ch(γ ₂(L-L _M))+I _n2Z _c2sh(γ ₂(L-L _M))|…………(5)

In formula (5):

L _mfor the distance between trouble spot and the transformer station M of transmission line of electricity side;

L is transmission line length;

Z _c2for transmission line of electricity negative phase-sequence wave impedance;

γ ₂for negative phase-sequence propagation constant;

U _m2for the transformer station M negative sequence voltage of transmission line of electricity side;

U _n2for the transformer station N negative sequence voltage of transmission line of electricity opposite side;

I _m2for the transformer station M negative-sequence current of transmission line of electricity side;

I _n2for the transformer station N negative-sequence current of transmission line of electricity opposite side;

Utilize formula (4) or formula (5) that distance between the transformer station of trouble spot and transmission line of electricity side can be calculated;

3) range measurement of Comprehensive Evaluation travelling wave ranging method and the range measurement of fault analytical method, realizes the accurate location of transmission line malfunction.

2. electric power system fault hybrid ranging method as claimed in claim 1, is characterized in that:

Described collection travelling wave signal, its mode comprises high speed acquisition voltage/current information, directly gathers travelling wave signal, and when employing directly gathers travelling wave signal mode, travelling wave signal can from primary equipment ground wire or special traveling wave sensor.

3. electric power system fault hybrid ranging method as claimed in claim 1 or 2, is characterized in that:

Described step 1) differentiate that travelling wave signal arrives the moment of transformer station, be adopt mathematical method to differentiate row ripple, the voltage/current information utilizing wavelet transformation mathematical method analysis row wave datum harvester to gather, finally identifies the capable ripple due in of voltage/current.

4. electric power system fault hybrid ranging method as claimed in claim 1 or 2, is characterized in that:

Described step 1) differentiate that travelling wave signal arrives the moment of transformer station, be adopt hardware circuit to differentiate row ripple, the voltage/current travelling wave signal gathered by proprietary hardware circuit analysis row wave datum harvester, finally identifies the capable ripple due in of voltage/current.

5. electric power system fault hybrid ranging method as claimed in claim 1 or 2, is characterized in that:

Described step 1) both-end travelling wave ranging method range finding adopt high precision pair time, when being global position system GPS pair during described high precision pair and dipper system pair time in one.

6. electric power system fault hybrid ranging method as claimed in claim 5, is characterized in that:

Described step 1) transmission line of electricity side transformer station arrange data collector and step 2) transmission line of electricity side transformer station arrange data collector, be same set of data collector;

Described step 1) transmission line of electricity opposite side transformer station arrange data collector and step 2) transmission line of electricity opposite side transformer station arrange data collector, be same set of data collector;

Or

Described step 1) transmission line of electricity side transformer station arrange data collector and step 2) transmission line of electricity side transformer station arrange data collector, be not same set of data collector;

Described step 1) transmission line of electricity opposite side transformer station arrange data collector and step 2) transmission line of electricity opposite side transformer station arrange data collector, be not same set of data collector.

7. electric power system fault hybrid ranging method as claimed in claim 1, is characterized in that:

Described step 3) the range measurement of Comprehensive Evaluation travelling wave ranging method and the range measurement of fault analytical method, comprising:

If the range measurement of travelling wave ranging method and the range measurement of fault analytical method are all effective, then localization of fault adopts the range measurement of the travelling wave ranging method close with the range measurement of fault analytical method;

If the range measurement of travelling wave ranging method is effective, the range measurement of fault analytical method is invalid, then localization of fault adopts the range measurement of travelling wave ranging method;

If the range measurement of travelling wave ranging method is invalid, the range measurement of fault analytical method is effective, then localization of fault adopts the range measurement of fault analytical method.

8. electric power system fault hybrid ranging method as claimed in claim 7, is characterized in that:

Described step 3) the range measurement of fault analysis, be the range measurement of Comprehensive Evaluation one-end fault analytic approach and the range measurement of both-end fault analytical method;

The described range measurement of Comprehensive Evaluation one-end fault analytic approach and the range measurement of both-end fault analytical method, comprising:

If only there is one-sided electrical data, then localization of fault adopts the range measurement of one-end fault analytic approach;

If the range measurement of one-end fault analytic approach is in district, the range measurement of both-end fault analytical method is outside district, then localization of fault adopts the range measurement of one-end fault analytic approach;

If the range measurement of one-end fault analytic approach is in district, the range measurement of both-end fault analytical method is in district, then localization of fault adopts the range measurement of both-end fault analytical method;

If the range measurement of one-end fault analytic approach is outside district, the range measurement of both-end fault analytical method is outside district, then localization of fault adopts the range measurement of both-end fault analytical method;

If the range measurement of one-end fault analytic approach is outside district, the range measurement of both-end fault analytical method is in district, then localization of fault adopts the range measurement of both-end fault analytical method.