CN102967799A - 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.The one-end fault analytic approach adopts single ended voltage/current data to calculate fault impedance, and then obtains fault distance, and the method is subjected to the impact of the factors such as transition resistance, and distance accuracy is relatively poor.The both-end fault analytical method utilizes both-end voltage/current data to calculate fault distance, is subjected to the factor affecting such as transition resistance less than the one-end fault analytic approach, and distance accuracy is higher than the one-end fault analytic approach, but needs to gather the both-end electric data.

The travelling wave ranging method is the localization method of realizing according to theory of travelling wave.When transmission line of electricity breaks down, the trouble spot produces transient voltage and the current break signal is voltage traveling wave and current traveling wave signal, propagate along power circuit to circuit both sides electrical network with certain speed, the mistiming of utilizing the trouble spot travelling wave signal to arrive the circuit both sides can calculate fault distance.The 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 utilization row ripple is propagated between trouble spot and transformer station is realized fault localization; The mistiming that both-end travelling wave ranging method utilizes trouble spot row ripple to arrive the transmission line of electricity both sides is realized fault localization.Single Ended Fault Location and both-end travelling wave ranging method are subjected to the factor affecting such as system operation mode, transition resistance less, 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 very easily is subjected to the interference of reflected traveling wave and refraction row ripple, often needing artificially to participate in fault judges, practicality is poor, and in Single Ended Fault Location and both-end travelling wave ranging method is too faint at the fault traveling wave signal or the fault traveling wave life period the is too short situation, 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 defective that remedies above-mentioned prior art, and a kind of electric power system fault hybrid ranging method is provided.

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 data collector that is arranged by the transformer station of transmission line of electricity one side and the transformer station of transmission line of electricity opposite side arrange is finished fault localization jointly automatically.

The characteristics of this electric power system fault hybrid ranging method are:

When having the trouble spot in the transmission line of electricity, may further comprise the steps:

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

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

In the formula (1):

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

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

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

t _mArrive the moment of the M of transformer station of transmission line of electricity one side for the row ripple;

t _nArrive the moment of the N of transformer station of transmission line of electricity opposite side for the row ripple;

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

3) comprehensively pass judgment on the range finding result of travelling wave ranging method and the range finding result of fault analytical method, realize 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, adopts when directly gathering the travelling wave signal mode, and travelling wave signal can be from primary equipment ground wire or special-purpose traveling wave sensor.

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

Described step 1) range finding of both-end travelling wave ranging method adopt high precision to the time, described high precision to the time be GPS (Global Positioning System, initialism are GPS) to the time and dipper system to the time in a kind of.

Data collector and step 2 that the transformer station of transmission line of electricity one side described step 1) arranges) the data collector that arranges of the transformer station of transmission line of electricity one side, be same set of data collector.

Data collector and step 2 that the transformer station of transmission line of electricity opposite side described step 1) arranges) the data collector that arranges of the transformer station of transmission line of electricity opposite side, be same set of data collector.

Data collector and step 2 that the transformer station of transmission line of electricity one side described step 1) arranges) the data collector that arranges of the transformer station of transmission line of electricity one side, be not same set of data collector.

Data collector and step 2 that the transformer station of transmission line of electricity opposite side described step 1) arranges) the data collector that arranges of the transformer station of transmission line of electricity opposite side, be not same set of data collector.

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

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

z ₁Be transmission line of electricity unit length positive sequence impedance.

U _MfFault phase voltage phasor value for the M of transformer station of transmission line of electricity one side;

I _MfFault phase electric current phasor value for the M of transformer station of transmission line of electricity one side;

K is zero sequence current compensation factor;

3I ₀The M of transformer station zero-sequence current for transmission line of electricity one 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 the transformer station of trouble spot and transmission line of electricity one 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 the formula (3):

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

z ₁Be transmission line of electricity unit length positive sequence impedance;

U _Mf1Be the two-phase short-circuit fault of the M of transformer station of transmission line of electricity one side 1 voltage phasor value mutually;

U _Mf2Be the two-phase short-circuit fault of the M of transformer station of transmission line of electricity one side 2 voltage phasor value mutually;

I _Mf1Be the two-phase short-circuit fault of the M of transformer station of transmission line of electricity one side 1 electric current phasor value mutually;

I _Mf2Be the two-phase short-circuit fault of the M of transformer station of transmission line of electricity one side 2 electric current phasor value mutually.

Described step 2) both-end fault analytical method comprises power frequency positive sequence both-end distance measuring method and power frequency negative phase-sequence both-end distance measuring method, adopts the computing formula of power frequency positive sequence both-end distance measuring 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 the formula (4):

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

L is the transmission line of electricity total length;

Z _C1Be transmission line of electricity positive sequence wave impedance;

γ ₁Be the positive sequence propagation constant;

U _M1The M of transformer station positive sequence voltage for transmission line of electricity one side;

U _N1The N of transformer station positive sequence voltage for the transmission line of electricity opposite side;

I _M1The M of transformer station forward-order current for transmission line of electricity one side;

I _N1The N of transformer station forward-order current for the transmission line of electricity opposite side.

Adopt the computing formula of power frequency negative phase-sequence both-end distance measuring 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 the formula (5):

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

L is the transmission line of electricity total length;

Z _C2Be transmission line of electricity negative phase-sequence wave impedance;

γ ₂Be the negative phase-sequence propagation constant;

U _M2The M of transformer station negative sequence voltage for transmission line of electricity one side;

U _N2The N of transformer station negative sequence voltage for the transmission line of electricity opposite side;

I _M2The M of transformer station negative-sequence current for transmission line of electricity one side;

I _N2The N of transformer station negative-sequence current for the 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 one side.

The range finding result of comprehensive judge travelling wave ranging method described step 3) and the range finding result of fault analytical method comprise:

If the range finding result of the range finding result of travelling wave ranging method and fault analytical method is all effective, then localization of fault adopts the range finding result of the travelling wave ranging method that the range finding result with fault analytical method approaches;

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

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

The range finding result of fault analytical method described step 3) is comprehensively to pass judgment on the range finding result of one-end fault analytic approach and the range finding result of both-end fault analytical method.

The range finding result of described comprehensive judge one-end fault analytic approach and the range finding result of both-end fault analytical method comprise:

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

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

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

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

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

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

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 are high, can reliably, accurately realize the transmission line malfunction location.Under both-end travelling wave ranging method is found range effective situation, adopt one-end fault analytic approach, both-end fault analytical method to filter out unique travelling wave ranging result, effectively to avoid the interference of reflected traveling wave and refraction row ripple; In the situation of both-end travelling wave ranging method travelling wave ranging failure, adopt one-end fault analytic approach, both-end fault analytical method to finish fault localization, significantly improved the reliability of measuring distance of transmission line fault location.

Description of drawings

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

Among the figure: F is failure point of power transmission line; L _MBe the distance of trouble spot apart from the M of transformer station, L is the transmission line of electricity total length, i.e. distance between the M of transformer station and the N of transformer station.

Embodiment

Below in conjunction with embodiment and contrast accompanying drawing the present invention will be described.

A kind of electric power system fault hybrid ranging method, be that the M of transformer station of transmission line of electricity both sides of 300km and the data collector that the N of transformer station arranges are finished 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 the M of transformer station are assumed to be 50km.

This embodiment may further comprise the steps:

1) data collector that is arranged by transmission line of electricity both sides transformer station gathers travelling wave signal and identifies the travelling wave signal due in, gather the row ripple and comprise high speed acquisition voltage/current information, directly gather the travelling wave signal from primary equipment ground wire or special-purpose traveling wave sensor, differentiate that travelling wave signal arrives the moment of transformer station, to adopt mathematical method to differentiate the row ripple, the voltage/current information of utilizing wavelet transformation mathematical method analysis row wave datum harvester to gather, finally identify the capable ripple due in of voltage/current, perhaps adopt hardware circuit to differentiate the row ripple, voltage/current travelling wave signal by proprietary hardware circuit analysis row wave datum harvester collection, finally identify the capable ripple due in of voltage/current, and adopt global position system GPS to the time or the dipper system high precision to the time, determine the distance between the transformer station of described trouble spot and described transmission line of electricity one 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 the formula (1):

L _MBe the distance between trouble spot and the M of transformer station;

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 _mArrive the moment of the M of transformer station for the row ripple;

t _nArrive the moment of the N of transformer station for the row ripple;

The range finding the possibility of result that adopts both-end travelling wave ranging method actual computation to go out has a plurality of, and one of them range finding result is: the distance between trouble spot and the M of transformer station is 50.5km, and the distance between trouble spot and the N of transformer station is 290.3km;

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

Adopt impedance method single-end earthed to measure fault distance between the transformer station of trouble spot and transmission line of electricity one 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 the formula (2):

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

z ₁Be transmission line of electricity unit length positive sequence impedance.

U _MfFault phase voltage phasor value for the M of transformer station of transmission line of electricity one side;

I _MfFault phase electric current phasor value for the M of transformer station of transmission line of electricity one side;

K is zero sequence current compensation factor;

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

The range finding result who adopts impedance method actual computation single-end earthed to go out is: the distance between trouble spot and the M of transformer station is 45.3km;

The both-end fault analytical method comprises power frequency positive sequence both-end distance measuring method and power frequency negative phase-sequence both-end distance measuring method, adopts the computing formula of power frequency positive sequence both-end distance measuring 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 the formula (4):

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

L is the transmission line of electricity total length;

Z _C1Be transmission line of electricity positive sequence wave impedance;

γ ₁Be the positive sequence propagation constant;

U _M1The M of transformer station positive sequence voltage for transmission line of electricity one side;

U _N1The N of transformer station positive sequence voltage for the transmission line of electricity opposite side;

I _M1The M of transformer station forward-order current for transmission line of electricity one side;

I _N1The N of transformer station forward-order current for the transmission line of electricity opposite side.

Adopt the computing formula of power frequency negative phase-sequence both-end distance measuring 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 the formula (5):

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

L is the transmission line of electricity total length;

Z _C2Be transmission line of electricity negative phase-sequence wave impedance;

γ ₂Be the negative phase-sequence propagation constant;

U _M2The M of transformer station negative sequence voltage for transmission line of electricity one side;

U _N2The N of transformer station negative sequence voltage for the transmission line of electricity opposite side;

I _M2The M of transformer station negative-sequence current for transmission line of electricity one side;

I _N2The N of transformer station negative-sequence current for the 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 one side, the range finding result who adopts both-end fault analytical method actual computation to go out is: 48.1km;

3) comprehensively pass judgment on the range finding result of travelling wave ranging method and the range finding result of fault analytical method, realize the accurate location of transmission line malfunction;

The comprehensive range finding result of travelling wave ranging method and the range finding result of fault analytical method of passing judgment on comprises:

If the range finding result of the range finding result of travelling wave ranging method and fault analytical method is all effective, then localization of fault adopts the range finding result of the travelling wave ranging method that the range finding result with fault analytical method approaches;

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

If it is invalid that the range finding result of travelling wave ranging method has, the range finding result of fault analytical method is effective, and then localization of fault adopts the range finding result of fault analytical method, comprehensively passes judgment on the range finding result of one-end fault analysis and the range finding result of both-end fault analytical method, comprising:

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

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

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

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

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

This embodiment contrasts such as following table 1 with the localization of fault result who adopts respectively single one-end fault analytic approach, both-end fault analytical method, both-end travelling wave ranging method, wherein explanation in the above of positioning result 1, positioning result 2～4th, other range finding result of three times contrast.

Table 1 (unit: km)

Positioning result	1	2	3	4
					The single-ended impedance telemetry	45.3	45.3	45.3	45.3
The 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 result contrast of table 1 shows, the specific embodiment of the present invention has fully been chosen the fault localization result of error minimum in one-end fault analytic approach, both-end fault analytical method, the both-end travelling wave ranging method, and distance accuracy and reliability obviously are better than adopting the fault localization of single method.

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

Claims (10)

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

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

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

In the formula (1):

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

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

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

t _mArrive the moment of the M of transformer station of transmission line of electricity one side for the row ripple;

t _nArrive the moment of the N of transformer station of transmission line of electricity opposite side for the row ripple;

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

3) comprehensively pass judgment on the range finding result of travelling wave ranging method and the range finding result of fault analytical method, realize 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 step 1) gather travelling wave signal, its mode comprises high speed acquisition voltage/current information, directly gathers travelling wave signal, adopts when directly gathering the travelling wave signal mode, and travelling wave signal can be from primary equipment ground wire or special-purpose 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) differentiating that travelling wave signal arrives the moment of transformer station, is to adopt mathematical method to differentiate the row ripple, and the voltage/current information of 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) differentiating that travelling wave signal arrives the moment of transformer station, is to adopt hardware circuit to differentiate the row ripple, and the voltage/current travelling wave signal by proprietary hardware circuit analysis row wave datum harvester gathers 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) range finding of both-end travelling wave ranging method adopt high precision to the time, described high precision to the time be global position system GPS to the time and dipper system to the time in a kind of.

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

Data collector and step 2 that the transformer station of transmission line of electricity one side described step 1) arranges) the data collector that arranges of the transformer station of transmission line of electricity one side, be same set of data collector;

Data collector and step 2 that the transformer station of transmission line of electricity opposite side described step 1) arranges) the data collector that arranges of the transformer station of transmission line of electricity opposite side, be same set of data collector;

Data collector and step 2 that the transformer station of transmission line of electricity one side described step 1) arranges) the data collector that arranges of the transformer station of transmission line of electricity one side, be not same set of data collector;

Data collector and step 2 that the transformer station of transmission line of electricity opposite side described step 1) arranges) the data collector that arranges of the transformer station of transmission line of electricity opposite side, 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 2) one-end fault analytic approach comprises single-end earthed impedance method and single-ended line to line fault impedance method, when trouble spot single-phase earthing or three-phase ground, adopt impedance method single-end earthed to measure fault distance between the transformer station of trouble spot and transmission line of electricity one 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 the formula (2):

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

z ₁Be transmission line of electricity unit length positive sequence impedance;

U _MfFault phase voltage phasor value for the M of transformer station of transmission line of electricity one side;

I _MfFault phase electric current phasor value for the M of transformer station of transmission line of electricity one side;

K is zero sequence current compensation factor;

3I ₀The M of transformer station zero-sequence current for transmission line of electricity one 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 the transformer station of trouble spot and transmission line of electricity one 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 the formula (3):

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

z ₁Be transmission line of electricity unit length positive sequence impedance;

U _Mf1Be the two-phase short-circuit fault of the M of transformer station of transmission line of electricity one side 1 voltage phasor value mutually;

U _Mf2Be the two-phase short-circuit fault of the M of transformer station of transmission line of electricity one side 2 voltage phasor value mutually;

I _Mf1Be the two-phase short-circuit fault of the M of transformer station of transmission line of electricity one side 1 electric current phasor value mutually;

I _Mf2Be the two-phase short-circuit fault of the M of transformer station of transmission line of electricity one side 2 electric current phasor value mutually.

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

Described step 2) both-end fault analytical method comprises power frequency positive sequence both-end distance measuring method and power frequency negative phase-sequence both-end distance measuring method, adopts the computing formula of power frequency positive sequence both-end distance measuring 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 the formula (4):

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

L is transmission line length;

Z _C1Be transmission line of electricity positive sequence wave impedance;

γ ₁Be the positive sequence propagation constant;

U _M1The M of transformer station positive sequence voltage for transmission line of electricity one side;

U _N1The N of transformer station positive sequence voltage for the transmission line of electricity opposite side;

I _M1The M of transformer station forward-order current for transmission line of electricity one side;

I _N1The N of transformer station forward-order current for the transmission line of electricity opposite side;

Adopt the computing formula of power frequency negative phase-sequence both-end distance measuring 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 the formula (5):

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

L is transmission line length;

Z _C2Be transmission line of electricity negative phase-sequence wave impedance;

γ ₂Be the negative phase-sequence propagation constant;

U _M2The M of transformer station negative sequence voltage for transmission line of electricity one side;

U _N2The N of transformer station negative sequence voltage for the transmission line of electricity opposite side;

I _M2The M of transformer station negative-sequence current for transmission line of electricity one side;

I _N2The N of transformer station negative-sequence current for the 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 one side.

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

The range finding result of comprehensive judge travelling wave ranging method described step 3) and the range finding result of fault analytical method comprise:

If the range finding result of the range finding result of travelling wave ranging method and fault analytical method is all effective, then localization of fault adopts the range finding result of the travelling wave ranging method that the range finding result with fault analytical method approaches;

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

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

10. electric power system fault hybrid ranging method as claimed in claim 9 is characterized in that:

The range finding result of fault analysis described step 3) is comprehensively to pass judgment on the range finding result of one-end fault analytic approach and the range finding result of both-end fault analytical method;

The range finding result of described comprehensive judge one-end fault analytic approach and the range finding result of both-end fault analytical method comprise:

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

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

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

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

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

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