CN105974274A - Power transmission line fault location method and system - Google Patents

Abstract

The invention discloses a power transmission line fault location method. The method comprises the following steps: carrying out first fault location by utilizing line positive-sequence parameters obtained before fault and first transient data of the line obtained after fault to obtain an initial fault location value; calculating line positive-sequence parameters obtained after fault by utilizing the initial location value and second transient data of the line obtained after fault; and carrying out fault location again by utilizing the line positive-sequence parameters obtained after fault and the first transient data to obtain a corrected fault location value. The line positive-sequence parameters obtained before fault and the first transient data of the line obtained after fault are utilized to carry out initial fault location; in order to improve fault location precision, the line positive-sequence parameters obtained after fault are calculated based on the initial fault location value; and then, fault location is carried out again by utilizing the line positive-sequence parameters obtained after fault, which is equivalent to an effect that the initial fault location value is subjected to correction processing, so that higher-precision fault location value can be obtained. Besides, the invention also discloses a power transmission line fault location system.

Description

A kind of fault positioning method for transmission line and system

Technical field

The present invention relates to fault localization technical field, particularly to a kind of fault positioning method for transmission line and system.

Background technology

Measuring distance of transmission line fault is the important component part of relay protection of power system, be one ensure power grid security, The necessary technology measure of stable operation.Line fault point is carried out in time, positions accurately, beneficially the quick process of fault, Reduce the economic loss that causes of having a power failure, it is to avoid because having a power failure, social life is adversely affected, have great technology, economy and Social benefit.

But, the range accuracy of existing fault distance-finding method also cannot fully meet the needs of power generation, range accuracy Need to be further improved.

In sum it can be seen that promoting fault localization precision the most further is current problem demanding prompt solution.

Summary of the invention

In view of this, it is an object of the invention to provide a kind of fault positioning method for transmission line and system, carry further Rise fault localization precision.Its concrete scheme is as follows:

A kind of fault positioning method for transmission line, including:

After utilizing the positive order parameter of the circuit before fault and fault, the first Temporal Data of circuit carries out initial fault range finding, To initial ranging value；Wherein, the propagation coefficient before the positive order parameter of circuit before described fault includes fault and the characteristic before fault Impedance；

Utilize the second Temporal Data of circuit after described initial ranging value and fault, calculate the circuit positive sequence ginseng after fault Number；Wherein, the propagation coefficient after the positive order parameter of circuit after described fault includes fault and the characteristic impedance after fault；

Utilize the positive order parameter of the circuit after described fault and described first Temporal Data to carry out fault localization again, repaiied Fault localization value after just.

Preferably, described utilize fault before the positive order parameter of circuit and fault after the first Temporal Data of circuit carry out for the first time Fault localization, obtains the process of initial ranging value, including:

Utilize the positive order parameter of the circuit before described fault and described first Temporal Data, default equation is solved, To described initial ranging value；Wherein, described default equation is:

${\stackrel{\·}{U}}_1^{\left(1\right)}ch\left({\mathrm{\γ}}_0{x}_0\right)-{\stackrel{\·}{I}}_1^{\left(1\right)}{Z}_{0}sh\left({\mathrm{\γ}}_0{x}_0\right)={\stackrel{\·}{U}}_2^{\left(1\right)}ch\[{\mathrm{\γ}}_0(l-x_0)\]+{\stackrel{\·}{I}}_2^{\left(1\right)}{Z}_{0}sh\[{\mathrm{\γ}}_0(l-x_0)\];$

In formula, γ₀Represent the propagation coefficient before described fault, Z₀Represent the characteristic impedance before described fault；Represent event The positive sequence voltage of the delivery end of Fisrt fault loop line after barrier,After expression fault, the delivery end of described Fisrt fault loop line is just Sequence electric current,The positive sequence voltage of the receiving terminal of described Fisrt fault loop line after expression fault,Represent after fault described first The forward-order current of the receiving terminal of fault loop line；L represents the total length of described Fisrt fault loop line, x₀Represent described initial ranging Value, ch (*) represents hyperbolic cosine function, and sh (*) represents hyperbolic sine function.

Preferably, described the second Temporal Data of circuit after described initial ranging value and fault is utilized, after calculating fault The process of the positive order parameter of circuit, including:

Utilize described initial ranging value and described second Temporal Data, the first equation group is solved, obtain described event The positive order parameter of circuit after barrier；

Wherein, described first equation group includes:

$\left\{\begin{array}{c}{\stackrel{\·}{U}}_1^{\left(1\right)}ch\left({\mathrm{\γ}}_1{x}_0\right)-{\stackrel{\·}{I}}_1^{\left(1\right)}{Z}_{1}sh\left({\mathrm{\γ}}_1{x}_0\right)={\stackrel{\·}{U}}_2^{\left(1\right)}ch\[{\mathrm{\γ}}_1(l-x_0)\]+{\stackrel{\·}{I}}_2^{\left(1\right)}{Z}_{1}sh\[{\mathrm{\γ}}_1(l-x_0)\]\\ {\stackrel{\·}{U}}_1^{\left(2\right)}ch\left({\mathrm{\γ}}_1{x}_0\right)-{\stackrel{\·}{I}}_1^{\left(2\right)}{Z}_{1}sh\left({\mathrm{\γ}}_1{x}_0\right)={\stackrel{\·}{U}}_2^{\left(2\right)}ch\[{\mathrm{\γ}}_1(l-x_0)\]+{\stackrel{\·}{I}}_2^{\left(2\right)}{Z}_{1}sh\[{\mathrm{\γ}}_1(l-x_0)\]\end{array}\right.;$

In formula, x₀Represent described initial ranging value；The positive sequence of the delivery end of described Fisrt fault loop line after expression fault Voltage,The forward-order current of the delivery end of described Fisrt fault loop line after expression fault,Described first event after representing fault The positive sequence voltage of the receiving terminal of barrier loop line,The forward-order current of the receiving terminal of described Fisrt fault loop line after expression fault, The negative sequence voltage of the delivery end of described Fisrt fault loop line after expression fault,Described Fisrt fault loop line after expression fault The negative-sequence current of delivery end,The negative sequence voltage of the receiving terminal of described Fisrt fault loop line after expression fault,Represent fault The negative-sequence current of the receiving terminal of rear described Fisrt fault loop line；γ₁Represent the propagation coefficient after described fault, Z₁Represent described event Characteristic impedance after barrier, l represents the total length of described Fisrt fault loop line.

Preferably, described the second Temporal Data of circuit after described initial ranging value and fault is utilized, after calculating fault The process of the positive order parameter of circuit, including:

Utilize described initial ranging value and described second Temporal Data, the second equation group is solved, obtain described event The positive order parameter of circuit after barrier；

Wherein, described second equation group includes:

$\left\{\begin{array}{c}{\stackrel{\·}{U}}_{I1}^{\left(1\right)}ch\left({\mathrm{\γ}}_1{x}_0\right)-{\stackrel{\·}{I}}_{I1}^{\left(1\right)}{Z}_{1}sh\left({\mathrm{\γ}}_1{x}_0\right)={\stackrel{\·}{U}}_{I2}^{\left(1\right)}ch\[{\mathrm{\γ}}_1(l-x_0)\]+{\stackrel{\·}{I}}_{I2}^{\left(1\right)}{Z}_{1}sh\[{\mathrm{\γ}}_1(l-x_0)\]\\ {\stackrel{\·}{U}}_{II1}^{\left(1\right)}ch\left({\mathrm{\γ}}_1{x}_0\right)-{\stackrel{\·}{I}}_{II1}^{\left(1\right)}{Z}_{1}sh\left({\mathrm{\γ}}_1{x}_0\right)={\stackrel{\·}{U}}_{II2}^{\left(1\right)}ch\[{\mathrm{\γ}}_1(l-x_0)\]+{\stackrel{\·}{I}}_{II2}^{\left(1\right)}{Z}_{1}sh\[{\mathrm{\γ}}_1(l-x_0)\]\end{array}\right.$

In formula, x₀Represent described initial ranging value；The positive sequence of the delivery end of described Fisrt fault loop line after expression fault Voltage,The forward-order current of the delivery end of described Fisrt fault loop line after expression fault,Described first event after representing fault The positive sequence voltage of the receiving terminal of barrier loop line,The forward-order current of the receiving terminal of described Fisrt fault loop line after expression fault, The positive sequence voltage of the delivery end of the second fault loop line after expression fault,The delivery end of described second fault loop line after expression fault Forward-order current,The positive sequence voltage of the receiving terminal of described second fault loop line after expression fault,Represent described in after fault The forward-order current of the receiving terminal of the second fault loop line；γ₁Represent the propagation coefficient after described fault, Z₁After representing described fault Characteristic impedance, l represents the total length of described Fisrt fault loop line.

Preferably, described fault positioning method for transmission line, also include:

Step S41: judge whether described revised fault localization value meets and preset range accuracy, if it is, by institute State revised fault localization value and be defined as final fault localization value, if it is not, then enter step S42；

Step S42: described revised fault localization value is defined as the fault localization value treating again to revise；

Step S43: treat the fault localization value again revised and carry out correcting process again, obtain current correction value；

Step S44: judge whether current correction value meets described default range accuracy, if it is not, then by current correction value It is defined as the fault localization value treating again to revise, and reenters step S43, if it is, current correction value is defined as Whole fault localization value, and terminate correcting process.

Preferably, treat the fault localization value again revised every time and carry out again the process of correcting process, including:

Utilize the fault localization value and described second Temporal Data treating again to revise, again calculate the circuit positive sequence after fault Parameter, obtains the positive order parameter of revised circuit；

Utilize the described positive order parameter of revised circuit and described first Temporal Data to carry out fault localization again, obtain phase The current correction value answered.

The invention also discloses a kind of measuring distance of transmission line fault system, including:

Initial fault range finder module, the first transient state number of circuit after utilizing the positive order parameter of circuit before fault and fault According to carrying out initial fault range finding, obtain initial ranging value；Wherein, the biography before the positive order parameter of circuit before described fault includes fault Broadcast the characteristic impedance before coefficient and fault；

Parameter calculating module, the second Temporal Data of circuit after utilizing described initial ranging value and fault, calculate event The positive order parameter of circuit after barrier；Wherein, after propagation coefficient after the positive order parameter of circuit after described fault includes fault and fault Characteristic impedance；

Fault localization module again, the positive order parameter of circuit and described first Temporal Data after utilizing described fault enter Row fault localization again, obtains revised fault localization value.

Preferably, described initial fault range finder module, specifically utilize the positive order parameter of the circuit before described fault and described One Temporal Data, solves default equation, obtains described initial ranging value；Wherein, described default equation is:

${\stackrel{\·}{U}}_1^{\left(1\right)}ch\left({\mathrm{\γ}}_0{x}_0\right)-{\stackrel{\·}{I}}_1^{\left(1\right)}{Z}_{0}sh\left({\mathrm{\γ}}_0{x}_0\right)={\stackrel{\·}{U}}_2^{\left(1\right)}ch\[{\mathrm{\γ}}_0(l-x_0)\]+{\stackrel{\·}{I}}_2^{\left(1\right)}{Z}_{0}sh\[{\mathrm{\γ}}_0(l-x_0)\];$

In formula, γ₀Represent the propagation coefficient before described fault, Z₀Represent the characteristic impedance before described fault；Represent event The positive sequence voltage of the delivery end of Fisrt fault loop line after barrier,After expression fault, the delivery end of described Fisrt fault loop line is just Sequence electric current,The positive sequence voltage of the receiving terminal of described Fisrt fault loop line after expression fault,Represent after fault described first The forward-order current of the receiving terminal of fault loop line；L represents the total length of described Fisrt fault loop line, x₀Represent described initial ranging Value, ch (*) represents hyperbolic cosine function, and sh (*) represents hyperbolic sine function.

Preferably, described parameter calculating module, specifically for utilizing described initial ranging value and described second Temporal Data, First equation group is solved, obtains the positive order parameter of the circuit after described fault；

Wherein, described first equation group includes:

$\left\{\begin{array}{c}{\stackrel{\·}{U}}_1^{\left(1\right)}ch\left({\mathrm{\γ}}_1{x}_0\right)-{\stackrel{\·}{I}}_1^{\left(1\right)}{Z}_{1}sh\left({\mathrm{\γ}}_1{x}_0\right)={\stackrel{\·}{U}}_2^{\left(1\right)}ch\[{\mathrm{\γ}}_1(l-x_0)\]+{\stackrel{\·}{I}}_2^{\left(1\right)}{Z}_{1}sh\[{\mathrm{\γ}}_1(l-x_0)\]\\ {\stackrel{\·}{U}}_1^{\left(2\right)}ch\left({\mathrm{\γ}}_1{x}_0\right)-{\stackrel{\·}{I}}_1^{\left(2\right)}{Z}_{1}sh\left({\mathrm{\γ}}_1{x}_0\right)={\stackrel{\·}{U}}_2^{\left(2\right)}ch\[{\mathrm{\γ}}_1(l-x_0)\]+{\stackrel{\·}{I}}_2^{\left(2\right)}{Z}_{1}sh\[{\mathrm{\γ}}_1(l-x_0)\]\end{array}\right.;$

In formula, x₀Represent described initial ranging value；The positive sequence of the delivery end of described Fisrt fault loop line after expression fault Voltage,The forward-order current of the delivery end of described Fisrt fault loop line after expression fault,Described first event after representing fault The positive sequence voltage of the receiving terminal of barrier loop line,The forward-order current of the receiving terminal of described Fisrt fault loop line after expression fault, The negative sequence voltage of the delivery end of described Fisrt fault loop line after expression fault,Described Fisrt fault loop line after expression fault The negative-sequence current of delivery end,The negative sequence voltage of the receiving terminal of described Fisrt fault loop line after expression fault,Represent fault The negative-sequence current of the receiving terminal of rear described Fisrt fault loop line；γ₁Represent the propagation coefficient after described fault, Z₁Represent described event Characteristic impedance after barrier, l represents the total length of described Fisrt fault loop line.

Preferably, described parameter calculating module, specifically for utilizing described initial ranging value and described second Temporal Data, Second equation group is solved, obtains the positive order parameter of the circuit after described fault；

Wherein, described second equation group includes:

$\left\{\begin{array}{c}{\stackrel{\·}{U}}_{I1}^{\left(1\right)}ch\left({\mathrm{\γ}}_1{x}_0\right)-{\stackrel{\·}{I}}_{I1}^{\left(1\right)}{Z}_{1}sh\left({\mathrm{\γ}}_1{x}_0\right)={\stackrel{\·}{U}}_{I2}^{\left(1\right)}ch\[{\mathrm{\γ}}_1(l-x_0)\]+{\stackrel{\·}{I}}_{I2}^{\left(1\right)}{Z}_{1}sh\[{\mathrm{\γ}}_1(l-x_0)\]\\ {\stackrel{\·}{U}}_{II1}^{\left(1\right)}ch\left({\mathrm{\γ}}_1{x}_0\right)-{\stackrel{\·}{I}}_{II1}^{\left(1\right)}{Z}_{1}sh\left({\mathrm{\γ}}_1{x}_0\right)={\stackrel{\·}{U}}_{II2}^{\left(1\right)}ch\[{\mathrm{\γ}}_1(l-x_0)\]+{\stackrel{\·}{I}}_{II2}^{\left(1\right)}{Z}_{1}sh\[{\mathrm{\γ}}_1(l-x_0)\]\end{array}\right.$

In formula, x₀Represent described initial ranging value；The positive sequence of the delivery end of described Fisrt fault loop line after expression fault Voltage,The forward-order current of the delivery end of described Fisrt fault loop line after expression fault,Described first event after representing fault The positive sequence voltage of the receiving terminal of barrier loop line,The forward-order current of the receiving terminal of described Fisrt fault loop line after expression fault, The positive sequence voltage of the delivery end of the second fault loop line after expression fault,The delivery end of described second fault loop line after expression fault Forward-order current,The positive sequence voltage of the receiving terminal of described second fault loop line after expression fault,Represent described in after fault The forward-order current of the receiving terminal of the second fault loop line；γ₁Represent the propagation coefficient after described fault, Z₁After representing described fault Characteristic impedance, l represents the total length of described Fisrt fault loop line.

Preferably, measuring distance of transmission line fault system, also include the first precision judge module, correcting module and the second precision Judge module: described correcting module includes determining submodule and revising submodule；Wherein,

Described first precision judge module, is used for judging whether described revised fault localization value meets and presets range finding essence Degree, if it is, be defined as final fault localization value, if it is not, then repair described in Chu Faing by described revised fault localization value Positive module startup work；

Described determine submodule, for described revised fault localization value being defined as the fault localization treating again to revise Value；

Described correction submodule, for treating that the fault localization value again revised carries out correcting process again, is currently repaiied On the occasion of；

Described second precision judge module, for judging whether the current correction value that described correcting module obtains meets described Preset range accuracy, if it is not, then current correction value to be defined as the fault localization value treating again to revise, and trigger described correction Submodule is again started up work, if it is, current correction value is defined as final fault localization value.

Preferably, described correction submodule includes:

Parameters revision unit, for utilizing the fault localization value and described second Temporal Data treating again to revise, counts again Calculate the positive order parameter of circuit after fault, obtain the positive order parameter of revised circuit；

Fault localization unit again, is used for utilizing the described positive order parameter of revised circuit and described first Temporal Data to enter Row fault localization again, obtains corresponding current correction value.

In the present invention, fault positioning method for transmission line, including: utilize line after the positive order parameter of the circuit before fault and fault First Temporal Data on road carries out initial fault range finding, obtains initial ranging value；Wherein, the positive order parameter of circuit before fault includes Propagation coefficient before fault and the characteristic impedance before fault；Utilize the second Temporal Data of circuit after initial ranging value and fault, Calculate the positive order parameter of circuit after fault；Wherein, the propagation coefficient after the positive order parameter of circuit after fault includes fault and fault After characteristic impedance；Utilize the positive order parameter of the circuit after fault and the first Temporal Data to carry out fault localization again, revised After fault localization value.Visible, the present invention is first with the first transient state number of circuit after the positive order parameter of the circuit before fault and fault According to carrying out initial fault range finding, obtain initial ranging value, in order to promote fault localization precision further, the present invention utilize above-mentioned at the beginning of Beginning distance measurement value calculates the positive order parameter of the circuit after fault, then utilizes the above-mentioned circuit positive sequence ginseng being worth to based on initial ranging Number carries out fault localization again, and this is equivalent to above-mentioned initial ranging value has been carried out a correcting process, thus obtains precision more High fault localization value.

Accompanying drawing explanation

In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing In having technology to describe, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is only this Inventive embodiment, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to according to The accompanying drawing provided obtains other accompanying drawing.

Fig. 1 is a kind of fault positioning method for transmission line flow chart disclosed in the embodiment of the present invention；

Fig. 2 is a kind of measuring distance of transmission line fault system structure schematic diagram disclosed in the embodiment of the present invention.

Detailed description of the invention

Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete Describe, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments wholely.Based on Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under not making creative work premise Embodiment, broadly falls into the scope of protection of the invention.

The embodiment of the invention discloses a kind of fault positioning method for transmission line, shown in Figure 1, the method includes:

Step S11: after utilizing the positive order parameter of the circuit before fault and fault, the first Temporal Data of circuit carries out first event Barrier range finding, obtains initial ranging value；Wherein, the propagation coefficient before the positive order parameter of circuit before above-mentioned fault includes fault and fault Front characteristic impedance.

That is, the characteristic impedance of the propagation coefficient of transmission line of electricity before utilizing transmission line of electricity to break down, transmission line of electricity with And the first Temporal Data after fault carries out initial fault range finding, obtain initial ranging value.Wherein, above-mentioned first Temporal Data is The Temporal Data that transmission line of electricity detects after breaking down, this Temporal Data includes voltage and current data.

It addition, the steady state data of circuit calculates before the positive order parameter of circuit before above-mentioned fault specifically can utilize fault Arriving, concrete calculating process refers to existing correlation technique, no longer repeats at this.

It should be noted that above-mentioned initial ranging value is temporary on circuit after the positive order parameter of the circuit before fault and fault Obtain on the basis of state data, owing to the existence of the positive order parameter of the circuit before fault order parameter positive with the circuit after fault is compared bright Aobvious diversity, so, the initial survey obtained based on the Temporal Data on circuit after the positive order parameter of the circuit before fault and fault Error away from value is relatively big, needs follow-up through further correcting process.

Step S12: utilize the second Temporal Data of circuit after above-mentioned initial ranging value and fault, calculate the circuit after fault Positive order parameter；Wherein, the propagation coefficient after the positive order parameter of circuit after above-mentioned fault includes fault and the characteristic impedance after fault.

That is, the second Temporal Data of circuit after utilizing above-mentioned initial ranging value and fault, calculate transmission line of electricity after fault On propagation coefficient and characteristic impedance it is understood that above-mentioned second Temporal Data and above-mentioned first Temporal Data are fault After Temporal Data on the transmission line of electricity that detects, all include voltage and current data.

Step S13: utilize the positive order parameter of the circuit after above-mentioned fault and above-mentioned first Temporal Data to carry out again fault and survey Away from, obtain revised fault localization value.

It should be noted that relative to the positive order parameter of the circuit before fault, owing to the positive order parameter of the circuit after fault can Fault state on circuit after more laminating fault occurs, so, based on the positive order parameter of the circuit after above-mentioned fault and above-mentioned The fault localization value that first Temporal Data obtains, compared to above-mentioned based on the positive order parameter of the circuit before fault with above-mentioned first transient state The initial ranging value that data obtain, has higher degree of accuracy, it can be seen that, the fault localization again in step S13 processes this It is the correcting process that above-mentioned initial ranging value is carried out in matter, thus obtains precision higher fault localization value.

In the embodiment of the present invention, fault positioning method for transmission line, including: utilize the positive order parameter of the circuit before fault and event After barrier, the first Temporal Data of circuit carries out initial fault range finding, obtains initial ranging value；Wherein, the circuit positive sequence ginseng before fault Number includes the propagation coefficient before fault and the characteristic impedance before fault；Utilize the second transient state of circuit after initial ranging value and fault Data, calculate the positive order parameter of circuit after fault；Wherein, the propagation coefficient after the positive order parameter of circuit after fault includes fault and Characteristic impedance after fault；Utilize the positive order parameter of the circuit after fault and the first Temporal Data to carry out fault localization again, obtain Revised fault localization value.Visible, the embodiment of the present invention is first with circuit after the positive order parameter of the circuit before fault and fault First Temporal Data carries out initial fault range finding, obtains initial ranging value, in order to promote fault localization precision, the present invention further Embodiment utilizes above-mentioned initial ranging value to calculate the positive order parameter of circuit after fault, then utilizes above-mentioned based on initial ranging value The positive order parameter of circuit obtained carries out fault localization again, and this is equivalent to above-mentioned initial ranging value has been carried out a Corrections Division Reason, thus obtain precision higher fault localization value.

The embodiment of the invention discloses a kind of concrete fault positioning method for transmission line, relative to a upper embodiment, this Technical scheme has been made further instruction and optimization by embodiment.Concrete:

In upper embodiment step S11, utilize the first transient state number of circuit after the positive order parameter of the circuit before fault and fault According to carrying out initial fault range finding, obtain the process of initial ranging value, including: utilize the positive order parameter of the circuit before fault and first temporary State data, solve default equation, obtain initial ranging value；Wherein, above-mentioned default equation is:

${\stackrel{\·}{U}}_1^{\left(1\right)}ch\left({\mathrm{\γ}}_0{x}_0\right)-{\stackrel{\·}{I}}_1^{\left(1\right)}{Z}_{0}sh\left({\mathrm{\γ}}_0{x}_0\right)={\stackrel{\·}{U}}_2^{\left(1\right)}ch\[{\mathrm{\γ}}_0(l-x_0)\]+{\stackrel{\·}{I}}_2^{\left(1\right)}{Z}_{0}sh\[{\mathrm{\γ}}_0(l-x_0)\];$

In formula, γ₀Represent the propagation coefficient before fault, Z₀Represent the characteristic impedance before fault；Represent after fault first The positive sequence voltage of the delivery end of fault loop line,The forward-order current of the delivery end of Fisrt fault loop line after expression fault,Table Show the positive sequence voltage of the receiving terminal of Fisrt fault loop line after fault,The positive sequence of the receiving terminal of Fisrt fault loop line after expression fault Electric current；L represents the total length of Fisrt fault loop line, x₀Representing initial ranging value, ch (*) represents hyperbolic cosine function, sh (_*) table Show hyperbolic sine function.It is understood that the positive order parameter of circuit before above-mentioned fault includes γ₀And Z₀；Above-mentioned first transient state number According to including With

It is understood that by simplifying above-mentioned default equation, simplified equation accordingly, then utilizing should Simplify equation, above-mentioned initial ranging value x can be tried to achieve₀.Wherein, this simplification equation is:

$\frac{{\stackrel{\·}{U}}_1^{\left(1\right)}-\[{\stackrel{\·}{U}}_2^{\left(1\right)}ch\left({\mathrm{\γ}}_{0}l\right)+{\stackrel{\·}{I}}_2^{\left(1\right)}{Z}_{0}sh\left({\mathrm{\γ}}_{0}l\right)\]}{Z_0{\stackrel{\·}{I}}_1^{\left(1\right)}-\[{\stackrel{\·}{U}}_2^{\left(1\right)}sh\left({\mathrm{\γ}}_{0}l\right)+{\stackrel{\·}{I}}_2^{\left(1\right)}{Z}_{0}ch\left({\mathrm{\γ}}_{0}l\right)\]}=th\left({\mathrm{\γ}}_0{x}_0\right);$

Wherein, th (*) represents hyperbolic tangent function.By solving above-mentioned simplification equation, available above-mentioned initial ranging value.

And in upper embodiment step S12, specifically can be respectively adopted two according to two kinds of different situations on transmission line of electricity Planting different computational methods order parameters positive to the circuit after fault to calculate, wherein, first method is same after a failure It is applied to above-mentioned in the case of two ends Temporal Data on one fault loop line all exists the bigger positive sequence of amplitude and negative sequence component In step S12, second method is then that the negative sequence component amplitude in the two ends Temporal Data on arbitrary fault loop line is equal It is applied in above-mentioned steps S12 in the case of smaller.

More specifically, above-mentioned first method specifically includes: utilize initial ranging value and the second Temporal Data, to first party Journey group solves, and obtains the positive order parameter of the circuit after fault；

Wherein, the first equation group includes:

$\left\{\begin{array}{c}{\stackrel{\·}{U}}_1^{\left(1\right)}ch\left({\mathrm{\γ}}_1{x}_0\right)-{\stackrel{\·}{I}}_1^{\left(1\right)}{Z}_{1}sh\left({\mathrm{\γ}}_1{x}_0\right)={\stackrel{\·}{U}}_2^{\left(1\right)}ch\[{\mathrm{\γ}}_1(l-x_0)\]+{\stackrel{\·}{I}}_2^{\left(1\right)}{Z}_{1}sh\[{\mathrm{\γ}}_1(l-x_0)\]\\ {\stackrel{\·}{U}}_1^{\left(2\right)}ch\left({\mathrm{\γ}}_1{x}_0\right)-{\stackrel{\·}{I}}_1^{\left(2\right)}{Z}_{1}sh\left({\mathrm{\γ}}_1{x}_0\right)={\stackrel{\·}{U}}_2^{\left(2\right)}ch\[{\mathrm{\γ}}_1(l-x_0)\]+{\stackrel{\·}{I}}_2^{\left(2\right)}{Z}_{1}sh\[{\mathrm{\γ}}_1(l-x_0)\]\end{array}\right.;$

In formula, x₀Represent initial ranging value；The positive sequence voltage of the delivery end of Fisrt fault loop line after expression fault, The forward-order current of the delivery end of Fisrt fault loop line after expression fault,The receiving terminal of Fisrt fault loop line after expression fault Positive sequence voltage,The forward-order current of the receiving terminal of Fisrt fault loop line after expression fault,After representing fault, Fisrt fault returns The negative sequence voltage of the delivery end of line,The negative-sequence current of the delivery end of Fisrt fault loop line after expression fault,Represent fault The negative sequence voltage of the receiving terminal of rear Fisrt fault loop line,The negative-sequence current of the receiving terminal of Fisrt fault loop line after expression fault； γ₁Represent the propagation coefficient after fault, Z₁Representing the characteristic impedance after fault, l represents the total length of Fisrt fault loop line.Permissible Being understood by, when above-mentioned first method being applied in step S12, above-mentioned second Temporal Data specifically includes above-mentioned first In equation groupWithIn above-mentioned first method, by asking Solve above-mentioned first equation group, γ can be obtained₁And Z₁。

Concrete, by solving above-mentioned first equation group, can obtain:

${\mathrm{\γ}}_1=\sqrt{\left|\frac{w_0}{w_1}\right|}{e}^{\frac{2k\mathrm{\π}+\arg (-\frac{w_0}{w_1})}{2}};$

Wherein,

γ is being obtained by above-mentioned two formulas₁On the basis of, can correspondingly obtain Z based on equation one or equation two₁。 It should be noted that above-mentioned equation one and equation two are all the equatioies derived by above-mentioned first equation group.Wherein,

Above-mentioned equation one particularly as follows:

Above-mentioned equation two particularly as follows:

And above-mentioned second method specifically includes: utilize initial ranging value and the second Temporal Data, the second equation group is entered Row solves, and obtains the positive order parameter of the circuit after fault；

Wherein, the second equation group includes:

$\left\{\begin{array}{c}{\stackrel{\·}{U}}_{I1}^{\left(1\right)}ch\left({\mathrm{\γ}}_1{x}_0\right)-{\stackrel{\·}{I}}_{I1}^{\left(1\right)}{Z}_{1}sh\left({\mathrm{\γ}}_1{x}_0\right)={\stackrel{\·}{U}}_{I2}^{\left(1\right)}ch\[{\mathrm{\γ}}_1(l-x_0)\]+{\stackrel{\·}{I}}_{I2}^{\left(1\right)}{Z}_{1}sh\[{\mathrm{\γ}}_1(l-x_0)\]\\ {\stackrel{\·}{U}}_{II1}^{\left(1\right)}ch\left({\mathrm{\γ}}_1{x}_0\right)-{\stackrel{\·}{I}}_{II1}^{\left(1\right)}{Z}_{1}sh\left({\mathrm{\γ}}_1{x}_0\right)={\stackrel{\·}{U}}_{II2}^{\left(1\right)}ch\[{\mathrm{\γ}}_1(l-x_0)\]+{\stackrel{\·}{I}}_{II2}^{\left(1\right)}{Z}_{1}sh\[{\mathrm{\γ}}_1(l-x_0)\]\end{array}\right.;$

In formula, x₀Represent initial ranging value；The positive sequence voltage of the delivery end of Fisrt fault loop line after expression fault, The forward-order current of the delivery end of Fisrt fault loop line after expression fault,The receiving terminal of Fisrt fault loop line after expression fault Positive sequence voltage,The forward-order current of the receiving terminal of Fisrt fault loop line after expression fault,After representing fault, the second fault is returned The positive sequence voltage of the delivery end of line,The forward-order current of the delivery end of the second fault loop line after expression fault,Represent fault The positive sequence voltage of the receiving terminal of rear second fault loop line,The forward-order current of the receiving terminal of the second fault loop line after expression fault； γ₁Represent the propagation coefficient after fault, Z₁Representing the characteristic impedance after fault, l represents the total length of Fisrt fault loop line.Permissible Being understood by, when above-mentioned second method being applied in step S12, above-mentioned second Temporal Data specifically includes above-mentioned second In equation groupWithIn above-mentioned second method, by asking Solve above-mentioned second equation group, γ can be obtained₁And Z₁。

Concrete, by above-mentioned second equation group, and combineWithCan derive following formula:

${\stackrel{\·}{I}}_{F1}^{\left(1\right)}sh\left({\mathrm{\γ}}_1{x}_0\right)=-\frac{{\stackrel{\·}{I}}_{F2}^{\left(1\right)}}{{\stackrel{\·}{I}}_{F1}^{\left(1\right)}}sh\[{\mathrm{\γ}}_1(l-x_0)\];$

Wherein,

By above-mentioned two formulas, and the expansion combining Maclaurin series processes, and can obtain γ₁, wherein,

${\mathrm{\γ}}_1=\sqrt{\left|W_0\right|}{e}^{\frac{2k\mathrm{\π}+\arg \left(W_0\right)}{2}};$

Wherein,

Obtaining γ₁On the basis of, can correspondingly obtain Z based on equation three₁, it should be noted that above-mentioned equation Three are derived by above-mentioned second equation group.Wherein,

Above-mentioned equation three particularly as follows:

Wherein,

In summary, the two ends Temporal Data on the most same fault loop line all exists the bigger positive sequence of amplitude and In the case of negative sequence component, above-mentioned first method is applied in above-mentioned steps S12, and two on arbitrary fault loop line In the case of holding the negative sequence component amplitude in Temporal Data smaller, then above-mentioned second method is applied to above-mentioned steps In S12.

It addition, in upper embodiment step S13, utilize the positive order parameter of the circuit after above-mentioned fault and above-mentioned first transient state number According to carrying out fault localization again, obtain the process of revised fault localization value, specifically may include that after utilizing above-mentioned fault The positive order parameter of circuit and above-mentioned first Temporal Data, solve the default equation after adjusting, and obtains above-mentioned revised event Barrier distance measurement value.Wherein, default equation after above-mentioned adjustment particularly as follows:

${\stackrel{\·}{U}}_1^{\left(1\right)}ch\left({\mathrm{\γ}}_1{x}_1\right)-{\stackrel{\·}{I}}_1^{\left(1\right)}{Z}_{1}sh\left({\mathrm{\γ}}_1{x}_1\right)={\stackrel{\·}{U}}_2^{\left(1\right)}ch\[{\mathrm{\γ}}_1(l-x_1)\]+{\stackrel{\·}{I}}_2^{\left(1\right)}{Z}_{1}sh\[{\mathrm{\γ}}_1(l-x_1)\];$

In formula, γ₁Represent the propagation coefficient after the fault calculated in above-mentioned steps S12, Z₁Represent in above-mentioned steps S12 Characteristic impedance after the fault calculated；The positive sequence voltage of the delivery end of Fisrt fault loop line after expression fault,Represent The forward-order current of the delivery end of Fisrt fault loop line after fault,The positive sequence of the receiving terminal of Fisrt fault loop line after expression fault Voltage,The forward-order current of the receiving terminal of Fisrt fault loop line after expression fault；L represents the total length of Fisrt fault loop line, x₁ Represent above-mentioned revised fault localization value.It is understood that the positive order parameter of circuit after above-mentioned fault includes γ₁And Z₁；On State the first Temporal Data to includeWithIn the present embodiment, by solving the default side after above-mentioned adjustment Journey, can obtain revised fault localization value x₁。

It should be noted that about the solution procedure of the default equation after above-mentioned adjustment refer to aforementioned disclosed at the beginning of The solution procedure of beginning distance measurement value, no longer repeats at this.

The embodiment of the invention discloses one more specifically fault positioning method for transmission line, relative to a upper embodiment, Technical scheme has been made further instruction and optimization by the present embodiment.Concrete:

In order to further improve fault localization precision, relative to both of the aforesaid embodiment, the transmission of electricity in the present embodiment Circuit fault distance measurement, it is also possible to farther include below step S41 to S44；Wherein,

Step S41: judge in previous embodiment step S13, whether revised fault localization value meets default range finding essence Degree, if it is, be defined as final fault localization value by above-mentioned revised fault localization value, if it is not, then enter step S42；

Step S42: revised fault localization value is defined as the fault localization value treating again to revise；

Step S43: treat the fault localization value again revised and carry out correcting process again, obtain current correction value；

Step S44: judge whether current correction value meets and preset range accuracy, if it is not, then current correction value determined For treating the fault localization value again revised, and reenter step S43, if it is, current correction value to be defined as final event Barrier distance measurement value, and terminate correcting process.

Wherein, in above-mentioned steps S43, treat the fault localization value again revised every time and carry out again the mistake of correcting process Journey, specifically includes: utilizes the fault localization value and above-mentioned second Temporal Data treating again to revise, again calculates the circuit after fault Positive order parameter, obtains the positive order parameter of revised circuit, then utilizes this positive order parameter of revised circuit and above-mentioned first temporary State data carry out fault localization again, obtain corresponding current correction value.

It should be noted that above-mentioned default range accuracy can be required have by technical staff according to actual range accuracy Body is arranged, and does not specifically limit it at this.

It is understood that the fault localization value again revised and above-mentioned second Temporal Data are treated in above-mentioned utilization, again count Calculate the process of the positive order parameter of circuit after fault, refer in previous embodiment disclosed first method or the second side Method, no longer repeats at this.In like manner, above-mentioned this positive order parameter of revised circuit and above-mentioned first Temporal Data is utilized to carry out The process of fault localization again, it is possible to reference to the solution procedure of disclosed initial ranging value in previous embodiment, at this not Repeat again.

Accordingly, the embodiment of the invention also discloses a kind of measuring distance of transmission line fault system, shown in Figure 2, this is System includes:

Initial fault range finder module 21, the first transient state of circuit after utilizing the positive order parameter of circuit before fault and fault Data carry out initial fault range finding, obtain initial ranging value；Wherein, before the positive order parameter of circuit before above-mentioned fault includes fault Characteristic impedance before propagation coefficient and fault；

Parameter calculating module 22, the second Temporal Data of circuit after utilizing above-mentioned initial ranging value and fault, calculate The positive order parameter of circuit after fault；Wherein, the propagation coefficient after the positive order parameter of circuit after above-mentioned fault includes fault and fault After characteristic impedance；

Fault localization module 23 again, the positive order parameter of circuit after utilizing above-mentioned fault and above-mentioned first Temporal Data Carry out fault localization again, obtain revised fault localization value.

Visible, the embodiment of the present invention is first with the first Temporal Data of circuit after the positive order parameter of the circuit before fault and fault Carry out initial fault range finding, obtain initial ranging value, in order to promote fault localization precision further, in embodiment of the present invention utilization State initial ranging value to calculate the positive order parameter of circuit after fault, just then utilize the above-mentioned circuit being worth to based on initial ranging Order parameter carries out fault localization again, and this is equivalent to above-mentioned initial ranging value has been carried out a correcting process, thus obtains essence Spend higher fault localization value.

Concrete, above-mentioned initial fault range finder module, the positive order parameter of circuit before available fault and the first Temporal Data, Default equation is solved, obtains initial ranging value；Wherein, default equation is:

${\stackrel{\·}{U}}_1^{\left(1\right)}ch\left({\mathrm{\γ}}_0{x}_0\right)-{\stackrel{\·}{I}}_1^{\left(1\right)}{Z}_{0}sh\left({\mathrm{\γ}}_0{x}_0\right)={\stackrel{\·}{U}}_2^{\left(1\right)}ch\[{\mathrm{\γ}}_0(l-x_0)\]+{\stackrel{\·}{I}}_2^{\left(1\right)}{Z}_{0}sh\[{\mathrm{\γ}}_0(l-x_0)\];$

In formula, γ₀Represent the propagation coefficient before fault, Z₀Represent the characteristic impedance before fault；Represent after fault first The positive sequence voltage of the delivery end of fault loop line,The forward-order current of the delivery end of Fisrt fault loop line after expression fault,Table Show the positive sequence voltage of the receiving terminal of Fisrt fault loop line after fault,After expression fault, the receiving terminal of Fisrt fault loop line is just Sequence electric current；L represents the total length of Fisrt fault loop line, x₀Representing initial ranging value, ch (*) represents hyperbolic cosine function, sh (*) Represent hyperbolic sine function.

It addition, all there is the bigger positive sequence of amplitude and negative phase-sequence in two ends Temporal Data on the most same fault loop line In the case of component, above-mentioned parameter computing module, it is particularly used in and utilizes initial ranging value and the second Temporal Data, to first party Journey group solves, and obtains the positive order parameter of the circuit after fault；

Wherein, the first equation group includes:

$\left\{\begin{array}{c}{\stackrel{\·}{U}}_1^{\left(1\right)}ch\left({\mathrm{\γ}}_1{x}_0\right)-{\stackrel{\·}{I}}_1^{\left(1\right)}{Z}_{1}sh\left({\mathrm{\γ}}_1{x}_0\right)={\stackrel{\·}{U}}_2^{\left(1\right)}ch\[{\mathrm{\γ}}_1(l-x_0)\]+{\stackrel{\·}{I}}_2^{\left(1\right)}{Z}_{1}sh\[{\mathrm{\γ}}_1(l-x_0)\]\\ {\stackrel{\·}{U}}_1^{\left(2\right)}ch\left({\mathrm{\γ}}_1{x}_0\right)-{\stackrel{\·}{I}}_1^{\left(2\right)}{Z}_{1}sh\left({\mathrm{\γ}}_1{x}_0\right)={\stackrel{\·}{U}}_2^{\left(2\right)}ch\[{\mathrm{\γ}}_1(l-x_0)\]+{\stackrel{\·}{I}}_2^{\left(2\right)}{Z}_{1}sh\[{\mathrm{\γ}}_1(l-x_0)\]\end{array}\right.;$

In formula, x₀Represent initial ranging value；The positive sequence voltage of the delivery end of Fisrt fault loop line after expression fault, The forward-order current of the delivery end of Fisrt fault loop line after expression fault,The receiving terminal of Fisrt fault loop line after expression fault Positive sequence voltage,The forward-order current of the receiving terminal of Fisrt fault loop line after expression fault,After representing fault, Fisrt fault returns The negative sequence voltage of the delivery end of line,The negative-sequence current of the delivery end of Fisrt fault loop line after expression fault,Represent fault The negative sequence voltage of the receiving terminal of rear Fisrt fault loop line,The negative-sequence current of the receiving terminal of Fisrt fault loop line after expression fault； γ₁Represent the propagation coefficient after fault, Z₁Representing the characteristic impedance after fault, l represents the total length of Fisrt fault loop line.

And in the case of negative sequence component amplitude in the two ends Temporal Data on arbitrary fault loop line is smaller, above-mentioned Parameter calculating module, is particularly used in and utilizes initial ranging value and the second Temporal Data, solve the second equation group, obtain The positive order parameter of circuit after fault；

Wherein, the second equation group includes:

$\left\{\begin{array}{c}{\stackrel{\·}{U}}_{I1}^{\left(1\right)}ch\left({\mathrm{\γ}}_1{x}_0\right)-{\stackrel{\·}{I}}_{I1}^{\left(1\right)}{Z}_{1}sh\left({\mathrm{\γ}}_1{x}_0\right)={\stackrel{\·}{U}}_{I2}^{\left(1\right)}ch\[{\mathrm{\γ}}_1(l-x_0)\]+{\stackrel{\·}{I}}_{I2}^{\left(1\right)}{Z}_{1}sh\[{\mathrm{\γ}}_1(l-x_0)\]\\ {\stackrel{\·}{U}}_{II1}^{\left(1\right)}ch\left({\mathrm{\γ}}_1{x}_0\right)-{\stackrel{\·}{I}}_{II1}^{\left(1\right)}{Z}_{1}sh\left({\mathrm{\γ}}_1{x}_0\right)={\stackrel{\·}{U}}_{II2}^{\left(1\right)}ch\[{\mathrm{\γ}}_1(l-x_0)\]+{\stackrel{\·}{I}}_{II2}^{\left(1\right)}{Z}_{1}sh\[{\mathrm{\γ}}_1(l-x_0)\]\end{array}\right.$

In formula, x₀Represent initial ranging value；The positive sequence voltage of the delivery end of Fisrt fault loop line after expression fault, The forward-order current of the delivery end of Fisrt fault loop line after expression fault,The receiving terminal of Fisrt fault loop line after expression fault Positive sequence voltage,The forward-order current of the receiving terminal of Fisrt fault loop line after expression fault,After representing fault, the second fault is returned The positive sequence voltage of the delivery end of line,The forward-order current of the delivery end of the second fault loop line after expression fault,Represent fault The positive sequence voltage of the receiving terminal of rear second fault loop line,The forward-order current of the receiving terminal of the second fault loop line after expression fault； γ₁Represent the propagation coefficient after fault, Z₁Representing the characteristic impedance after fault, l represents the total length of Fisrt fault loop line.

In order to further improve fault localization precision, the measuring distance of transmission line fault system in the present embodiment, also may be used To farther include the first precision judge module, correcting module and the second precision judge module: correcting module includes determining submodule Block and correction submodule；Wherein,

First precision judge module, is used for judging whether revised fault localization value meets and presets range accuracy, if It is then revised fault localization value to be defined as final fault localization value, if it is not, then trigger correcting module startup work；

Determine submodule, for revised fault localization value being defined as the fault localization value treating again to revise；

Revise submodule, for treating that the fault localization value again revised carries out correcting process again, obtain current correction value；

Second precision judge module, whether the current correction value obtained for judgment amendment module meets default range finding essence Degree, if it is not, then current correction value to be defined as the fault localization value treating again to revise, and trigger correction submodule be again started up Work, if it is, be defined as final fault localization value by current correction value.

Concrete, above-mentioned correction submodule includes parameters revision unit and fault localization unit again；Wherein, every time Treating during the fault localization value again revised carries out again correcting process, above-mentioned parameter amending unit, specifically for profit With treating the fault localization value again revised and above-mentioned second Temporal Data, again calculate the positive order parameter of circuit after fault, obtain The positive order parameter of revised circuit, and the above-mentioned unit of fault localization again, then specifically for just utilizing above-mentioned revised circuit Order parameter and above-mentioned first Temporal Data carry out fault localization again, obtain corresponding current correction value.

Finally, in addition it is also necessary to explanation, in this article, the relational terms of such as first and second or the like be used merely to by One entity or operation separate with another entity or operating space, and not necessarily require or imply these entities or operation Between exist any this reality relation or order.And, term " includes ", " comprising " or its any other variant meaning Containing comprising of nonexcludability, so that include that the process of a series of key element, method, article or equipment not only include that A little key elements, but also include other key elements being not expressly set out, or also include for this process, method, article or The key element that equipment is intrinsic.In the case of there is no more restriction, statement " including ... " key element limited, do not arrange Except there is also other identical element in including the process of described key element, method, article or equipment.

Above a kind of fault positioning method for transmission line provided by the present invention and system are described in detail, herein In apply specific case principle and the embodiment of the present invention be set forth, the explanation of above example is only intended to side Assistant solves method and the core concept thereof of the present invention；Simultaneously for one of ordinary skill in the art, according to the think of of the present invention Thinking, the most all will change, in sum, it is right that this specification content should not be construed as The restriction of the present invention.

Claims (12)

1. a fault positioning method for transmission line, it is characterised in that including:

After utilizing the positive order parameter of the circuit before fault and fault, the first Temporal Data of circuit carries out initial fault range finding, at the beginning of obtaining Beginning distance measurement value；Wherein, the propagation coefficient before the positive order parameter of circuit before described fault includes fault and the characteristic impedance before fault；

Utilize the second Temporal Data of circuit after described initial ranging value and fault, calculate the positive order parameter of circuit after fault；Its In, the positive order parameter of circuit after described fault includes the propagation coefficient after fault and the characteristic impedance after fault；

The positive order parameter of the circuit after described fault and described first Temporal Data is utilized to carry out fault localization again, after being revised Fault localization value.

Fault positioning method for transmission line the most according to claim 1, it is characterised in that described utilize the circuit before fault After positive order parameter and fault, the first Temporal Data of circuit carries out initial fault range finding, obtains the process of initial ranging value, including:

Utilize the positive order parameter of the circuit before described fault and described first Temporal Data, default equation is solved, obtains institute State initial ranging value；Wherein, described default equation is:

${\stackrel{\·}{U}}_1^{\left(1\right)}ch\left({\mathrm{\γ}}_0{x}_0\right)-{\stackrel{\·}{I}}_1^{\left(1\right)}{Z}_{0}sh\left({\mathrm{\γ}}_0{x}_0\right)={\stackrel{\·}{U}}_2^{\left(1\right)}ch\[{\mathrm{\γ}}_0(l-x_0)\]+{\stackrel{\·}{I}}_2^{\left(1\right)}{Z}_{0}sh\[{\mathrm{\γ}}_0(l-x_0)\];$

In formula, γ₀Represent the propagation coefficient before described fault, Z₀Represent the characteristic impedance before described fault；After representing fault The positive sequence voltage of the delivery end of Fisrt fault loop line,The positive sequence electricity of the delivery end of described Fisrt fault loop line after expression fault Stream,The positive sequence voltage of the receiving terminal of described Fisrt fault loop line after expression fault,Represent described Fisrt fault after fault The forward-order current of the receiving terminal of loop line；L represents the total length of described Fisrt fault loop line, x₀Represent described initial ranging value, ch (*) representing hyperbolic cosine function, sh (*) represents hyperbolic sine function.

Fault positioning method for transmission line the most according to claim 2, it is characterised in that described utilize described initial ranging Second Temporal Data of circuit after value and fault, calculates the process of the positive order parameter of circuit after fault, including:

Utilize described initial ranging value and described second Temporal Data, the first equation group is solved, after obtaining described fault The positive order parameter of circuit；

Wherein, described first equation group includes:

$\left\{\begin{array}{c}{\stackrel{\·}{U}}_1^{\left(1\right)}ch\left({\mathrm{\γ}}_1{x}_0\right)-{\stackrel{\·}{I}}_1^{\left(1\right)}{Z}_{1}sh\left({\mathrm{\γ}}_1{x}_0\right)={\stackrel{\·}{U}}_2^{\left(1\right)}ch\[{\mathrm{\γ}}_1(l-x_0)\]+{\stackrel{\·}{I}}_2^{\left(1\right)}{Z}_{1}sh\[{\mathrm{\γ}}_1(l-x_0)\]\\ {\stackrel{\·}{U}}_1^{\left(2\right)}ch\left({\mathrm{\γ}}_1{x}_0\right)-{\stackrel{\·}{I}}_1^{\left(2\right)}{Z}_{1}sh\left({\mathrm{\γ}}_1{x}_0\right)={\stackrel{\·}{U}}_2^{\left(2\right)}ch\[{\mathrm{\γ}}_1(l-x_0)\]+{\stackrel{\·}{I}}_2^{\left(2\right)}{Z}_{1}sh\[{\mathrm{\γ}}_1(l-x_0)\]\end{array}\right.;$

In formula, x₀Represent described initial ranging value；The positive sequence voltage of the delivery end of described Fisrt fault loop line after expression fault,The forward-order current of the delivery end of described Fisrt fault loop line after expression fault,Represent described Fisrt fault loop line after fault The positive sequence voltage of receiving terminal,The forward-order current of the receiving terminal of described Fisrt fault loop line after expression fault,Represent event The negative sequence voltage of the delivery end of described Fisrt fault loop line after barrier,The delivery end of described Fisrt fault loop line after expression fault Negative-sequence current,The negative sequence voltage of the receiving terminal of described Fisrt fault loop line after expression fault,Represent described in after fault The negative-sequence current of the receiving terminal of Fisrt fault loop line；γ₁Represent the propagation coefficient after described fault, Z₁After representing described fault Characteristic impedance, l represents the total length of described Fisrt fault loop line.

Fault positioning method for transmission line the most according to claim 2, it is characterised in that described utilize described initial ranging Second Temporal Data of circuit after value and fault, calculates the process of the positive order parameter of circuit after fault, including:

Utilize described initial ranging value and described second Temporal Data, the second equation group is solved, after obtaining described fault The positive order parameter of circuit；

Wherein, described second equation group includes:

$\left\{\begin{array}{c}{\stackrel{\·}{U}}_{I1}^{\left(1\right)}ch\left({\mathrm{\γ}}_1{x}_0\right)-{\stackrel{\·}{I}}_{I1}^{\left(1\right)}{Z}_{1}sh\left({\mathrm{\γ}}_1{x}_0\right)={\stackrel{\·}{U}}_{I2}^{\left(1\right)}ch\[{\mathrm{\γ}}_1(l-x_0)\]+{\stackrel{\·}{I}}_{I2}^{\left(1\right)}{Z}_{1}sh\[{\mathrm{\γ}}_1(l-x_0)\]\\ {\stackrel{\·}{U}}_{II1}^{\left(1\right)}ch\left({\mathrm{\γ}}_1{x}_0\right)-{\stackrel{\·}{I}}_{II1}^{\left(1\right)}{Z}_{1}sh\left({\mathrm{\γ}}_1{x}_0\right)={\stackrel{\·}{U}}_{II2}^{\left(1\right)}ch\[{\mathrm{\γ}}_1(l-x_0)\]+{\stackrel{\·}{I}}_{II2}^{\left(1\right)}{Z}_{1}sh\[{\mathrm{\γ}}_1(l-x_0)\]\end{array}\right.$

In formula, x₀Represent described initial ranging value；The positive sequence voltage of the delivery end of described Fisrt fault loop line after expression fault,The forward-order current of the delivery end of described Fisrt fault loop line after expression fault,Represent described Fisrt fault loop line after fault The positive sequence voltage of receiving terminal,The forward-order current of the receiving terminal of described Fisrt fault loop line after expression fault,Represent event The positive sequence voltage of the delivery end of the second fault loop line after barrier,After expression fault, the delivery end of described second fault loop line is just Sequence electric current,The positive sequence voltage of the receiving terminal of described second fault loop line after expression fault,Represent after fault described second The forward-order current of the receiving terminal of fault loop line；γ₁Represent the propagation coefficient after described fault, Z₁Represent the characteristic after described fault Impedance, l represents the total length of described Fisrt fault loop line.

5. according to the fault positioning method for transmission line described in any one of Claims 1-4, it is characterised in that also include:

Step S41: judge whether described revised fault localization value meets and preset range accuracy, if it is, repair described Fault localization value after just is defined as final fault localization value, if it is not, then enter step S42；

Step S42: described revised fault localization value is defined as the fault localization value treating again to revise；

Step S43: treat the fault localization value again revised and carry out correcting process again, obtain current correction value；

Step S44: judge whether current correction value meets described default range accuracy, if it is not, then determine current correction value For treating the fault localization value again revised, and reenter step S43, if it is, current correction value to be defined as final event Barrier distance measurement value, and terminate correcting process.

Fault positioning method for transmission line the most according to claim 5, it is characterised in that every time treat the event again revised Barrier distance measurement value carries out again the process of correcting process, including:

Utilize the fault localization value and described second Temporal Data treating again to revise, again calculate the circuit positive sequence ginseng after fault Number, obtains the positive order parameter of revised circuit；

Utilize the described positive order parameter of revised circuit and described first Temporal Data to carry out fault localization again, obtain corresponding Current correction value.

7. a measuring distance of transmission line fault system, it is characterised in that including:

Initial fault range finder module, after being used for the positive order parameter of circuit before utilizing fault and fault, the first Temporal Data of circuit enters Row initial fault is found range, and obtains initial ranging value；Wherein, the propagation system before the positive order parameter of circuit before described fault includes fault Characteristic impedance before number and fault；

Parameter calculating module, the second Temporal Data of circuit after utilizing described initial ranging value and fault, after calculating fault The positive order parameter of circuit；Wherein, the propagation coefficient after the positive order parameter of circuit after described fault includes fault and the spy after fault Property impedance；

Fault localization module again, the positive order parameter of circuit and described first Temporal Data after utilizing described fault are carried out again Secondary fault localization, obtains revised fault localization value.

Measuring distance of transmission line fault system the most according to claim 7, it is characterised in that described initial fault range finding mould Block, specifically utilizes the positive order parameter of the circuit before described fault and described first Temporal Data, solves default equation, obtain Described initial ranging value；Wherein, described default equation is:

${\stackrel{\·}{U}}_1^{\left(1\right)}ch\left({\mathrm{\γ}}_0{x}_0\right)-{\stackrel{\·}{I}}_1^{\left(1\right)}{Z}_{0}sh\left({\mathrm{\γ}}_0{x}_0\right)={\stackrel{\·}{U}}_2^{\left(1\right)}ch\[{\mathrm{\γ}}_0(l-x_0)\]+{\stackrel{\·}{I}}_2^{\left(1\right)}{Z}_{0}sh\[{\mathrm{\γ}}_0(l-x_0)\];$

In formula, γ₀Represent the propagation coefficient before described fault, Z₀Represent the characteristic impedance before described fault；After representing fault The positive sequence voltage of the delivery end of Fisrt fault loop line,The positive sequence electricity of the delivery end of described Fisrt fault loop line after expression fault Stream,The positive sequence voltage of the receiving terminal of described Fisrt fault loop line after expression fault,Represent described Fisrt fault after fault The forward-order current of the receiving terminal of loop line；L represents the total length of described Fisrt fault loop line, x₀Represent described initial ranging value, ch (*) representing hyperbolic cosine function, sh (*) represents hyperbolic sine function.

Measuring distance of transmission line fault system the most according to claim 8, it is characterised in that described parameter calculating module, tool Body is used for utilizing described initial ranging value and described second Temporal Data, solves the first equation group, obtains described fault After the positive order parameter of circuit；

Wherein, described first equation group includes:

$\left\{\begin{array}{c}{\stackrel{\·}{U}}_1^{\left(1\right)}ch\left({\mathrm{\γ}}_1{x}_0\right)-{\stackrel{\·}{I}}_1^{\left(1\right)}{Z}_{1}sh\left({\mathrm{\γ}}_1{x}_0\right)={\stackrel{\·}{U}}_2^{\left(1\right)}ch\[{\mathrm{\γ}}_1(l-x_0)\]+{\stackrel{\·}{I}}_2^{\left(1\right)}{Z}_{1}sh\[{\mathrm{\γ}}_1(l-x_0)\]\\ {\stackrel{\·}{U}}_1^{\left(2\right)}ch\left({\mathrm{\γ}}_1{x}_0\right)-{\stackrel{\·}{I}}_1^{\left(2\right)}{Z}_{1}sh\left({\mathrm{\γ}}_1{x}_0\right)={\stackrel{\·}{U}}_2^{\left(2\right)}ch\[{\mathrm{\γ}}_1(l-x_0)\]+{\stackrel{\·}{I}}_2^{\left(2\right)}{Z}_{1}sh\[{\mathrm{\γ}}_1(l-x_0)\]\end{array}\right.;$

In formula, x₀Represent described initial ranging value；The positive sequence voltage of the delivery end of described Fisrt fault loop line after expression fault,The forward-order current of the delivery end of described Fisrt fault loop line after expression fault,Represent described Fisrt fault loop line after fault The positive sequence voltage of receiving terminal,The forward-order current of the receiving terminal of described Fisrt fault loop line after expression fault,Represent event The negative sequence voltage of the delivery end of described Fisrt fault loop line after barrier,The delivery end of described Fisrt fault loop line after expression fault Negative-sequence current,The negative sequence voltage of the receiving terminal of described Fisrt fault loop line after expression fault,Represent described in after fault The negative-sequence current of the receiving terminal of Fisrt fault loop line；γ₁Represent the propagation coefficient after described fault, Z₁After representing described fault Characteristic impedance, l represents the total length of described Fisrt fault loop line.

Measuring distance of transmission line fault system the most according to claim 8, it is characterised in that described parameter calculating module, tool Body is used for utilizing described initial ranging value and described second Temporal Data, solves the second equation group, obtains described fault After the positive order parameter of circuit；

Wherein, described second equation group includes:

$\left\{\begin{array}{c}{\stackrel{\·}{U}}_{I1}^{\left(1\right)}ch\left({\mathrm{\γ}}_1{x}_0\right)-{\stackrel{\·}{I}}_{I1}^{\left(1\right)}{Z}_{1}sh\left({\mathrm{\γ}}_1{x}_0\right)={\stackrel{\·}{U}}_{I2}^{\left(1\right)}ch\[{\mathrm{\γ}}_1(l-x_0)\]+{\stackrel{\·}{I}}_{I2}^{\left(1\right)}{Z}_{1}sh\[{\mathrm{\γ}}_1(l-x_0)\]\\ {\stackrel{\·}{U}}_{II1}^{\left(1\right)}ch\left({\mathrm{\γ}}_1{x}_0\right)-{\stackrel{\·}{I}}_{II1}^{\left(1\right)}{Z}_{1}sh\left({\mathrm{\γ}}_1{x}_0\right)={\stackrel{\·}{U}}_{II2}^{\left(1\right)}ch\[{\mathrm{\γ}}_1(l-x_0)\]+{\stackrel{\·}{I}}_{II2}^{\left(1\right)}{Z}_{1}sh\[{\mathrm{\γ}}_1(l-x_0)\]\end{array}\right.$

In formula, x₀Represent described initial ranging value；The positive sequence voltage of the delivery end of described Fisrt fault loop line after expression fault,The forward-order current of the delivery end of described Fisrt fault loop line after expression fault,Represent described Fisrt fault loop line after fault The positive sequence voltage of receiving terminal,The forward-order current of the receiving terminal of described Fisrt fault loop line after expression fault,Represent event The positive sequence voltage of the delivery end of the second fault loop line after barrier,The positive sequence of the delivery end of described second fault loop line after expression fault Electric current,The positive sequence voltage of the receiving terminal of described second fault loop line after expression fault,Described second event after representing fault The forward-order current of the receiving terminal of barrier loop line；γ₁Represent the propagation coefficient after described fault, Z₁Represent that the characteristic after described fault hinders Anti-, l represents the total length of described Fisrt fault loop line.

11. according to the measuring distance of transmission line fault system described in any one of claim 7 to 10, it is characterised in that also include One precision judge module, correcting module and the second precision judge module: described correcting module includes determining submodule and correction Submodule；Wherein,

Described first precision judge module, is used for judging whether described revised fault localization value meets and presets range accuracy, If it is, described revised fault localization value is defined as final fault localization value, if it is not, then trigger described correction mould Block startup work；

Described determine submodule, for described revised fault localization value being defined as the fault localization value treating again to revise；

Described correction submodule, for treating that the fault localization value again revised carries out correcting process again, obtains current correction value；

Described second precision judge module, for judging whether the current correction value that described correcting module obtains meets described presetting Range accuracy, if it is not, then current correction value is defined as the fault localization value treating again to revise, and triggers described correction submodule Block is again started up work, if it is, current correction value is defined as final fault localization value.

12. measuring distance of transmission line fault systems according to claim 11, it is characterised in that described correction submodule bag Include:

Parameters revision unit, for utilizing the fault localization value and described second Temporal Data treating again to revise, calculates event again The positive order parameter of circuit after barrier, obtains the positive order parameter of revised circuit；

Fault localization unit again, is used for utilizing the described positive order parameter of revised circuit and described first Temporal Data to carry out again Secondary fault localization, obtains corresponding current correction value.