CN105021950B

CN105021950B - Feeder line fault localization method, apparatus and system

Info

Publication number: CN105021950B
Application number: CN201410158393.9A
Authority: CN
Inventors: 叶宽; 张祎果; 周恺; 李春生; 杨国华; 龚玲; 刘亚东
Original assignee: SICHUAN ZHONGGUANG LIGHTNING PROTECTION TECHNOLOGIES Co Ltd; State Grid Corp of China SGCC; State Grid Beijing Electric Power Co Ltd
Current assignee: SICHUAN ZHONGGUANG LIGHTNING PROTECTION TECHNOLOGIES Co Ltd; State Grid Corp of China SGCC; State Grid Beijing Electric Power Co Ltd
Priority date: 2014-04-18
Filing date: 2014-04-18
Publication date: 2019-01-08
Anticipated expiration: 2034-04-18
Also published as: CN105021950A

Abstract

The invention discloses a kind of feeder line fault localization methods, apparatus and system.Wherein, which includes multiple branches, which includes: the time for obtaining multiple branches and detecting fault traveling wave；Judge that multiple roads detect whether the time of fault traveling wave is identical；If it is judged that the time for the fault traveling wave that multiple branches detect is identical, then the fault point of power circuit is in the region where the crosspoint of multiple branches；And if it is judged that the time for the fault traveling wave that multiple branches detect is different, then the fault point of power circuit is in the branch of earliest detection to fault traveling wave, wherein the device of multiple road detection fault traveling waves is all the same at a distance from crosspoint.Through the invention, it solves the problems, such as the position inaccuracy for searching line fault point in the prior art, and then has achieved the effect that accurate lookup line fault point.

Description

Feeder line fault localization method, apparatus and system

Technical field

The present invention relates to power circuit fields, in particular to a kind of feeder line fault localization method, device and are System.

Background technique

The high speed development of electric power networks make T-type line using more and more, delivering power is high, and load is heavier, one Denier breakdown loss also can be bigger.The research of T-type feeder line fault positioning can greatly shorten fault time, for power train System safe and stable operation has great significance.

The difficult point of T-type feeder line fault positioning is the judgement of fault branch.There are mainly two types of judgement events for the prior art Hinder the method for branch, i.e. fault analytical method and traveling wave method.Fault analytical method is passed through by the voltage and current at three end of T-type line It calculates each point voltage on Fault loop impedance or faulty line and obtains the position of fault point, but precision not can guarantee and calculate It is easy to appear pseudo- root in the process, it is difficult to distinguish true and false.Traveling wave method is the transient state travelling wave generated based on failure, according to theory of travelling wave reality Existing fault distance-finding method.Although the not influence vulnerable to line parameter circuit value fault type etc. of this traveling wave method, for T-type line Road, since in route bifurcation T point, catadioptric can occur for fault traveling wave, therefore can all detect failure at three ends of T-type circuit Traveling wave, it is difficult to judge the route that failure occurs.

The shortcomings that prior art

First: accident analysis law technology calculates complexity, needs to ignore distribution capacity or is joined by transition resistance and route Several influences, therefore precision is lower.

Second: due in route bifurcation T point, catadioptric can also occur for fault traveling wave, thus three ends of T-type circuit all It can detect that fault traveling wave, traveling wave method are difficult to judge the route that failure occurs.

For the problem for the position inaccuracy for searching line fault point in the prior art, effective solution is not yet proposed at present Scheme.

Summary of the invention

The main purpose of the present invention is to provide a kind of feeder line fault localization methods, apparatus and system, existing to solve There is the problem for the position inaccuracy that line fault point is searched in technology.

To achieve the goals above, according to an aspect of the invention, there is provided a kind of feeder line fault localization method. Feeder line fault localization method according to the present invention includes: that power circuit includes multiple branches, feeder line fault positioning side Method includes: the time for obtaining multiple branches and detecting fault traveling wave；Judge that multiple roads detect that time of fault traveling wave is It is no identical；If it is judged that the time for the fault traveling wave that multiple branches detect is identical, then the fault point of power circuit is in more Region where the crosspoint of a branch；And if it is judged that the time for the fault traveling wave that multiple branches detect it is different, then The fault point of power circuit is in the branch of earliest detection to fault traveling wave, wherein detects the dress of fault traveling wave in multiple roads It sets all the same at a distance from crosspoint.

Further, fault current detection device, each branch are respectively arranged on each road in multiple branches Be disposed with since the crosspoint of multiple branches Fisrt fault current detection means, the second fault current detection device and Third fault current detection device, feeder line fault localization method further include: obtain the detection of Fisrt fault current detection means The time difference of Fisrt fault traveling wave and the second fault traveling wave, it is poor at the first time to obtain, wherein Fisrt fault traveling wave and the second failure Traveling wave is adjacent fault traveling wave；Obtain second fault current detection device detection Fisrt fault traveling wave and the second fault traveling wave Time difference obtained for the second time difference；Obtain third fault current detection device detection Fisrt fault traveling wave and the second fault traveling wave Time difference, obtain the third time difference；Judge whether poor, the second time difference and third time difference are equal at the first time；If sentenced Disconnected poor, the second time difference and third time difference are unequal at the first time out, it is determined that the fault point of power circuit is in the first event Hinder between current detection means and third fault current detection device；And if it is judged that first time poor, the second time difference It is equal with the third time difference, it is determined that the fault point of power circuit is in the friendship of Fisrt fault current detection means and multiple branches Between crunode, or in the two sides in third fault current detection device far from the second fault current detection device side, Wherein, Fisrt fault current detection means being equidistant away from crosspoint of each road, the second fault current detection device The midpoint of branch is set, and Fisrt fault current detection means and third fault current detection device are relative to the second fault current Detection device is symmetrical arranged.

Further, in the fault point for determining power circuit in the friendship of Fisrt fault current detection means and multiple branches Between crunode, after the side in the two sides in third fault current detection device far from the second fault current detection device, Feeder line fault localization method includes: the time for obtaining Fisrt fault current detection means detection Fisrt fault traveling wave, is obtained First detection time；The time for obtaining third fault current detection device detection Fisrt fault traveling wave, obtain the second detection time； Judge the size of the first detection time and the second detection time；If it is judged that the first detection time is greater than the second detection time, Then determine that the fault point of power circuit fills in the two sides of third fault current detection device far from the second fault current detection The side set；And if it is judged that the first detection time less than the second detection time, it is determined that the fault point of power circuit Between Fisrt fault current detection means and the crosspoint of multiple branches.

Further, in the fault point for determining power circuit in Fisrt fault current detection means and third fault current After between detection device, feeder line fault localization method includes: to obtain the first event of Fisrt fault current detection means detection The time for hindering traveling wave, obtain the first detection time；The time of third fault current detection device detection Fisrt fault traveling wave is obtained, Obtain the second detection time；Judge the size of the first detection time and the second detection time；If it is judged that the first detection time Less than the second detection time, it is determined that the fault point of power circuit is in Fisrt fault current detection means and the second fault current Between detection device；And if it is judged that the first detection time is greater than the second detection time, it is determined that the failure of power circuit Point is between the second fault current detection device and third fault current detection device.

Further, Fisrt fault current detection means and third fault current detection device are relative to the second fault current Detection device is symmetrical arranged, feeder line fault localization method further include: obtain the length of the first branch；Obtain Fisrt fault electricity The distance between flow detection device and the crosspoint of multiple branches；According to the length of the first branch and apart from calculating fault traveling wave Velocity of wave；And according to the distance between the end of branch where the fault point and fault point of velocity of wave computing electric line.

To achieve the goals above, according to another aspect of the present invention, a kind of electric line fault location device is provided. Electric line fault location device according to the present invention includes: that power circuit includes multiple branch electric line fault location devices Include: first acquisition unit, the time of fault traveling wave is detected for obtaining multiple branches；First judging unit, for judging Multiple roads detect whether the time of fault traveling wave is identical；First determination unit, for judging multiple branch detections When the time of the fault traveling wave arrived is identical, determine the fault point of power circuit in the region where the crosspoint of multiple branches； And second determination unit, for determining power line in the time difference for judging fault traveling wave that multiple branches detect The fault point on road is in the branch of earliest detection to fault traveling wave, wherein detects device and the friendship of fault traveling wave in multiple roads The distance of crunode is all the same.

Further, fault current detection device, each branch are respectively arranged on each road in multiple branches Be disposed with since the crosspoint of multiple branches Fisrt fault current detection means, the second fault current detection device and Third fault current detection device, electric line fault location device further include: second acquisition unit, for obtaining Fisrt fault Current detection means detects the time difference of Fisrt fault traveling wave and the second fault traveling wave, and it is poor at the first time to obtain, wherein the first event Hinder traveling wave and the second fault traveling wave is adjacent fault traveling wave；Third acquiring unit, for obtaining the second fault current detection dress The time difference for setting detection Fisrt fault traveling wave and the second fault traveling wave, obtained for the second time difference；4th acquiring unit, for obtaining Third fault current detection device detects the time difference of Fisrt fault traveling wave and the second fault traveling wave, obtains the third time difference；The Two judging units, for judging whether poor, the second time difference and third time difference are equal at the first time；Third determination unit is used In judging poor, the second time difference at the first time and when the unequal third time difference, determine the fault point of power circuit in Between Fisrt fault current detection means and third fault current detection device；And the 4th determination unit, for judging When poor at the first time, the second time difference and equal third time difference, determine the fault point of power circuit in Fisrt fault electric current Between detection device and the crosspoint of multiple branches, or far from the second event in the two sides in third fault current detection device Hinder the side of current detection means, wherein Fisrt fault current detection means being equidistant away from crosspoint of each road, The midpoint of branch, Fisrt fault current detection means and third fault current detection dress is arranged in second fault current detection device It sets and is symmetrical arranged relative to the second fault current detection device.

Further, electric line fault location device further include: the 5th acquiring unit, for determining power circuit Fault point is in third fault current detection device between Fisrt fault current detection means and the crosspoint of multiple branches Two sides in far from the second fault current detection device side after, obtain Fisrt fault current detection means detection first therefore The time for hindering traveling wave, obtain the first detection time；6th acquiring unit, for obtaining third fault current detection device detection the The time of one fault traveling wave obtains the second detection time；Third judging unit, for judging the first detection time and the second detection The size of time；5th determination unit, for determining power line when judging that the first detection time is greater than the second detection time The fault point on road is in the two sides of third fault current detection device far from the side of the second fault current detection device；And

6th determination unit, for determining power circuit when judging the first detection time less than the second detection time Fault point between Fisrt fault current detection means and the crosspoint of multiple branches.

Further, electric line fault location device further include: the 7th acquiring unit, for determining power circuit After fault point is between Fisrt fault current detection means and third fault current detection device, Fisrt fault electric current is obtained Detection device detects the time of Fisrt fault traveling wave, obtains the first detection time；8th acquiring unit, for obtaining third failure Current detection means detects the time of Fisrt fault traveling wave, obtains the second detection time；4th judging unit, for judging first The size of detection time and the second detection time；7th determination unit, for judging the first detection time less than the second inspection When surveying the time, determine the fault point of power circuit in Fisrt fault current detection means and the second fault current detection device it Between；And the 8th determination unit, for determining power circuit when judging that the first detection time is greater than the second detection time Fault point is between the second fault current detection device and third fault current detection device.

Further, Fisrt fault current detection means and third fault current detection device are relative to the second fault current Detection device is symmetrical arranged, electric line fault location device further include: the 9th acquiring unit, for obtaining the length of the first branch Degree；Tenth acquiring unit, for obtaining the distance between Fisrt fault current detection means and the crosspoint of multiple branches；First Computing unit, for the length according to the first branch and apart from the velocity of wave for calculating fault traveling wave；And second computing unit, it is used for The distance between the end of branch where the fault point and fault point of velocity of wave computing electric line.

To achieve the goals above, according to an aspect of the invention, there is provided a kind of fault positioning system of power line. Fault positioning system of power line according to the present invention includes: fault current detection device, is arranged on power circuit, for obtaining Multiple branches are taken to detect the time of fault traveling wave, concurrent inspection measures the time of fault traveling wave；And

Monitoring station judges multiple roads for receiving the time for the fault traveling wave that fault current detection device detects Detect whether the time of fault traveling wave is identical；If it is judged that the time for the fault traveling wave that multiple branches detect is identical, then The fault point of power circuit is in the region where the crosspoint of multiple branches；And if it is judged that multiple branches detected The time of fault traveling wave is different, then the fault point of power circuit is in the branch of earliest detection to fault traveling wave, wherein Duo Gezhi The device of road detection fault traveling wave is all the same at a distance from crosspoint.

Through the invention, include multiple branches using power circuit, obtain the time that multiple branches detect fault traveling wave； Judge that multiple roads detect whether the time of fault traveling wave is identical；If it is judged that the fault traveling wave that multiple branches detect Time it is identical, then the fault point of power circuit is in the region where the crosspoint of multiple branches；And it is if it is judged that more The time for the fault traveling wave that a branch detects is different, then the fault point of power circuit is in the branch of earliest detection to fault traveling wave The method on road solves the problems, such as the position inaccuracy for searching line fault point in the prior art, and then has reached accurate lookup The effect of line fault point.

Detailed description of the invention

The attached drawing constituted part of this application is used to provide further understanding of the present invention, schematic reality of the invention It applies example and its explanation is used to explain the present invention, do not constitute improper limitations of the present invention.In the accompanying drawings:

Fig. 1 is the schematic diagram of fault positioning system of power line according to an embodiment of the present invention；

Fig. 2 is the flow chart of feeder line fault localization method according to an embodiment of the present invention；

Fig. 3 a is the schematic diagram that section 1 breaks down in feeder line fault localization method according to an embodiment of the present invention；

Fig. 3 b is the schematic diagram that section 4 breaks down in feeder line fault localization method according to an embodiment of the present invention；

Fig. 3 c is the schematic diagram that section 2 breaks down in feeder line fault localization method according to an embodiment of the present invention；

Fig. 3 d is the schematic diagram that section 3 breaks down in feeder line fault localization method according to an embodiment of the present invention；

Fig. 4 is the schematic diagram of the preferable example of feeder line fault localization method according to an embodiment of the present invention；And

Fig. 5 is the schematic diagram of electric line fault location device according to an embodiment of the present invention.

Specific embodiment

It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase Mutually combination.The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

In order to enable those skilled in the art to better understand the solution of the present invention, below in conjunction in the embodiment of the present invention Attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is only The embodiment of a part of the invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill people The model that the present invention protects all should belong in member's every other embodiment obtained without making creative work It encloses.

It should be noted that description and claims of this specification and term " first " in above-mentioned attached drawing, " Two " etc. be to be used to distinguish similar objects, without being used to describe a particular order or precedence order.It should be understood that using in this way Data be interchangeable under appropriate circumstances, so as to the embodiment of the present invention described herein can in addition to illustrating herein or Sequence other than those of description is implemented.In addition, term " includes " and " having " and their any deformation, it is intended that cover Cover it is non-exclusive include, for example, the process, method, system, product or equipment for containing a series of steps or units are not necessarily limited to Step or unit those of is clearly listed, but may include be not clearly listed or for these process, methods, product Or other step or units that equipment is intrinsic.

The present invention provides a kind of fault positioning system of power line.

Fig. 1 is the schematic diagram of fault positioning system of power line according to an embodiment of the present invention.As shown in Figure 1, the electric power Line fault positioning system includes three branches, and the bus end of three branches is respectively substation M, substation N, substation P, often Item branch road all includes fault current detection device, which further includes monitoring station.

Fault current detection device is arranged on power circuit, for detecting the fault traveling wave of power circuit, concurrent inspection Measure the time of fault traveling wave.

Monitoring station, for receiving the time for the fault traveling wave that fault current detection device detects, and according to detecting Time of fault traveling wave determine the location of fault point of power circuit.

Power circuit includes multiple branches, and fault current detection device, a branch road are both provided on each road The fault current detection device of setting is one or three, preferably three.One failure electricity is only set on each road When flow detection device, fault current detection device being equidistant away from crosspoint of each road setting, in this way, due to failure Current spread speed is identical, according to the time that the fault current detection device of each road setting detects, can determine event The locating branch of barrier point.The case where three fault current detection devices are set on each road, event can not only be detected The locating branch of barrier point, moreover it is possible to detect fault point in which position of fault branch.Three fault currents of each road The setting of detection device is as shown in Figure 1.

Power circuit shown in FIG. 1 includes the first branch, second branch and third branch, and each branch is both provided with three Fault current detection device, respectively Fisrt fault current detection means, the second fault current detection device and third failure electricity Flow detection device.Wherein, the midpoint of branch where the second fault current detection device is installed on it, Fisrt fault current detecting dress It sets and is symmetrically disposed on branch where its relative to the second fault current detection device with third fault current detection device, due to the One fault current detection device and third fault current detection device are symmetrical arranged relative to the second fault current detection device, because This, third fault current detection device where it end of branch and Fisrt fault current detection means and crosspoint away from From identical.Due to three Fisrt fault current detection means of branch road and being equidistant for bifurcation T, third failure Current detection means is equidistant with the end of route where it.Fault current detection device such as Fig. 1, in the first branch Fault current detection device A3 three branches of distance of fault current detection device A2 and third branch road on A1, second branch Crosspoint T distance it is identical, the second fault current detection device B1, the second fault current detection device B2 and the second failure electricity Flow detection device B3 is respectively the midpoint at the midpoint of the first branch, the midpoint of second branch and third branch, third fault current Detection device C1 and Fisrt fault current detection means A1 is symmetrical relative to the second fault current detection device B1, similarly, third Fault current detection device C2 and Fisrt fault current detection means A2 is symmetrical relative to the second fault current detection device B2, the Three fault current detection device C3 and Fisrt fault current detection means A3 are symmetrical relative to the second fault current detection device B3.

After the fault current detection device on branch road detects fault traveling wave, the time that will test fault traveling wave is logical It crosses cordless communication network and is sent to monitoring station, monitoring station detects that the time of fault traveling wave determines hair at failure according to each branch Branch.

Preferably, in order to improve the accuracy rate for detecting fault traveling wave, the determining inspection of wave head for detecting fault traveling wave can be passed through Measure the time of fault traveling wave.When determination is which branch breaks down, a failure can be only set on each road Current detection means can pass through three of a branch road to determine when which specific location of branch breaks down Fault current detection device determines the position broken down.

So, the branch and the position on branch road that failure occurs how to be determined? the embodiment of the invention provides one Kind feeder line fault localization method.The branch that power circuit breaks down can be determined by the feeder line fault localization method The fault point of road and branch road.

Fig. 2 is the flow chart of feeder line fault localization method according to an embodiment of the present invention.The feeder line fault is fixed Power circuit in the method for position includes multiple branches, as shown, the feeder line fault localization method includes the following steps:

Step S102 obtains the time that multiple branches detect fault traveling wave.

When power circuit breaks down, each branch can detect fault traveling wave, but due to the position of failure generation The difference at a distance from the test point of each fault traveling wave is set, and the device for detecting fault traveling wave is identical away from the distance in crosspoint, because This, each test point detects that the time of fault traveling wave may be different.

Step S104 judges that multiple roads detect whether the time of fault traveling wave is identical.

Judge that multiple roads detect whether the time of fault traveling wave is identical, and is broken down according to judging result determination Branch.Preferably, the time of fault traveling wave arrival test point can be detected by detecting the wave head of fault traveling wave.

Step S106, if it is judged that the time for the fault traveling wave that multiple branches detect is identical, then the event of power circuit Barrier point is in the region where the crosspoint of multiple branches.

If it is judged that the time for the fault traveling wave that multiple branches detect is identical, then the positional distance to break down is multiple The distance of the test point of each branch is all the same in branch, then, only the intersection of multiple branches of power circuit is multiple The distance of the fault detecting point of branch is identical, that is, determines the fault point of power circuit in the area where the crosspoint of multiple branches Domain.

Step S108, if it is judged that the time for the fault traveling wave that multiple branches detect is different, then the event of power circuit Barrier point arrives a branch for fault traveling wave in earliest detection, wherein detects devices and the crosspoint of fault traveling wave in multiple roads Apart from all the same.

Since fault point of the test point apart from the branch for the branch road broken down is nearest, if it is judged that multiple branches The time of the fault traveling wave detected is different, it is determined that the fault point of power circuit is in the branch of earliest detection to fault traveling wave Road.

It should be noted that when whether the time for judging fault traveling wave that multiple branches detect identical, multiple branches The test point of upper detection fault traveling wave is identical at a distance from the crosspoint of multiple branches, it is preferable that can select each road The fault traveling wave detection device nearest apart from crosspoint detected.The test point of fault traveling wave in the embodiment can be Fault current detection device in fault positioning system of power line in the embodiment of the present invention.

Through the foregoing embodiment, the arrival of fault traveling wave can be detected according to the test point of the fault traveling wave of multiple roads Time, since the detection device of each road detection fault traveling wave is identical at a distance from crosspoint, according to what is detected Time judges which detection device of fault point distance is closer, i.e., by judge multiple branches detect fault traveling wave time whether It is identical to judge the position where fault point, if it is judged that detect that the time of fault traveling wave is identical, it is determined that failure occurs In the crosspoint of multiple branches, if it is judged that detecting that the time of fault traveling wave is different, it is determined that failure occurs in most morning inspection Measure the branch road of fault traveling wave.Detect that the time of fault traveling wave determines the branch of failure generation by comparing, not by route The influence of fault type, and complicated calculations are not necessarily to, influence of the line parameter circuit value to calculated result is avoided, to improve lookup The accuracy rate of fault point.

Preferably, it in order to further determine the position broken down, is respectively set on each road in multiple branches Faulty current detection means, each branch are disposed with Fisrt fault current detecting since the crosspoint of multiple branches Device, the second fault current detection device and third fault current detection device, the feeder line fault localization method further include:

The time difference for obtaining Fisrt fault current detection means detection Fisrt fault traveling wave and the second fault traveling wave, obtain the One time difference, wherein Fisrt fault traveling wave and the second fault traveling wave are adjacent fault traveling wave.

The time difference for obtaining the second fault current detection device detection Fisrt fault traveling wave and the second fault traveling wave, obtain the Two time differences.

The time difference for obtaining third fault current detection device detection Fisrt fault traveling wave and the second fault traveling wave, obtain the Three time differences.

Judge whether poor, the second time difference and third time difference are equal at the first time.

If it is judged that poor, the second time difference and third time difference are unequal at the first time, it is determined that the event of power circuit Barrier point is between Fisrt fault current detection means and third fault current detection device.

If it is judged that poor, the second time difference and third time difference are equal at the first time, it is determined that the failure of power circuit Point is between Fisrt fault current detection means and the crosspoint of multiple branches, or is in third fault current detection device Two sides in far from the second fault current detection device side.

It is disposed with Fisrt fault current detection means, the second fault current detection device and third on the first leg Fault current detection device, the second fault current detection device are arranged in the midpoint of branch, Fisrt fault current detection means and Third fault current detection device is symmetrical arranged relative to the second fault current detection device.

Fisrt fault current detection means, the second fault current detection device and third fault current detection device are examined respectively The time for surveying Fisrt fault traveling wave and the second fault traveling wave, failure is judged according to the time difference for detecting two neighboring fault traveling wave The position of point.

If it is judged that poor, the second time difference and third time difference are unequal at the first time, it is determined that the event of power circuit Barrier point is between Fisrt fault current detection means and third fault current detection device.If it is judged that poor at the first time, Second time difference and third time difference are equal, it is determined that the fault point of power circuit is in Fisrt fault current detection means and more It is filled between the crosspoint of a branch, or in the two sides in third fault current detection device far from the second fault current detection The side set.

It should be noted that the embodiment only by taking the first branch as an example to feeder line fault localization method of the invention into Row explanation, can similarly push away, other branches can also determine the position of fault point according to the method for the first branch.

Since a branch road is provided with three fault current detection devices, then a branch is by three fault current detections Device is divided into four sections, and Fig. 3 a to Fig. 3 d shows the schematic diagram that four sections break down.Below in conjunction with Fig. 3 a to Fig. 3 d The specific location to break down determining in the feeder line fault localization method of the embodiment of the present invention is illustrated.

Branch MT be any fault branch, Fisrt fault current detection means A1, the second fault current detection device B1 and Third fault current detection device C1 is the three groups of test points installed in the first branch, wherein the second fault current detection device B1 Positioned at route midpoint, Fisrt fault current detection means A1 and third fault current detection device C1 are located at fault branch both ends pair Claim position, if MC1=A1T=Y, the distance of fault point to M is X.If the first two traveling wave for being detected at A1, B1 and C1 reach when Between difference be respectively Δ t_A1、Δt_B1With Δ t_C1,

When route is in different section faults, the time difference of A1, B1 and C1 meet following rule:

As shown in Figure 3a, when failure occurs in section 1, i.e. 0 < X≤Y

As shown in Figure 3b, when failure occurs in section 4, i.e. L-Y≤X < L

As shown in Figure 3c, when failure occurs in section 2, i.e. Y < X≤L/2

As shown in Figure 2 d, when failure occurs in section 3, i.e. L/2≤X < L-Y

It is available by formula (1)~(4): the fault point for determining power circuit in Fisrt fault current detection means and Between the crosspoint of multiple branches, or far from the second fault current detection in the two sides in third fault current detection device After the side of device, feeder line fault localization method includes:

The time for obtaining Fisrt fault current detection means detection Fisrt fault traveling wave, obtain the first detection time.

The time for obtaining third fault current detection device detection Fisrt fault traveling wave, obtain the second detection time.

Judge the size of the first detection time and the second detection time.

If it is judged that the first detection time is greater than the second detection time, it is determined that the fault point of power circuit is in third Far from the side of the second fault current detection device in the two sides of fault current detection device.

If it is judged that the first detection time is less than the second detection time, it is determined that the fault point of power circuit is in first Between fault current detection device and the crosspoint of multiple branches.

Determine the fault point of power circuit between Fisrt fault current detection means and the crosspoint of multiple branches (such as Fig. 3 a), or side (such as figure in the two sides in third fault current detection device far from the second fault current detection device After 3b), the size of the first detection time and the second detection time is judged, if it is judged that the first detection time is greater than the second inspection Survey the time, it is determined that the fault point of power circuit is in the two sides of third fault current detection device far from the second fault current The side of detection device.If it is judged that the first detection time is less than the second detection time, it is determined that the fault point of power circuit Between crosspoint in Fisrt fault current detection means and multiple branches.

After getting the first detection time and the second detection time, if the first detection time is greater than the second detection Between, then, the distance that fault traveling wave propagates to Fisrt fault detection device be greater than propagate to third fault detection means away from From that is, fault point distance third fault detection means is closer, and the fault point due to having determined power circuit is in third event Hinder the side (such as Fig. 3 a) in the two sides of current detection means far from the second fault current detection device, or is in Fisrt fault Between current detection means and the crosspoint of multiple branches (such as Fig. 3 b), then it is determined that fault point area shown in Fig. 3 a at this time Section 1, similarly, when the first detection time is less than the second detection time, fault point section 4 shown in figure b.

In the fault point for determining power circuit in Fisrt fault current detection means and third fault current detection device Between after, feeder line fault localization method includes:

Judge the size of the first detection time and the second detection time.

If it is judged that the first detection time is less than the second detection time, it is determined that the fault point of power circuit is in first Between fault current detection device and the second fault current detection device.

If it is judged that the first detection time is greater than the second detection time, it is determined that the fault point of power circuit is in second Between fault current detection device and third fault current detection device.

Between Fisrt fault current detection means and the second fault current detection device (such as Fig. 3 d), or in the second event Between barrier current detection means and third fault current detection device after (such as Fig. 3 c), the first detection time and the second inspection are judged The size for surveying the time, if it is judged that the first detection time is less than the second detection time, it is determined that the fault point of power circuit Between Fisrt fault current detection means and the second fault current detection device.If it is judged that the first detection time is greater than the Two detection times, it is determined that the fault point of power circuit is filled in the second fault current detection device and third fault current detection Between setting.

After getting the first detection time and the second detection time, if the first detection time is greater than the second detection Between, then, the distance that fault traveling wave propagates to Fisrt fault detection device be greater than propagate to third fault detection means away from From that is, fault point distance third fault detection means is closer, and the fault point due to having determined power circuit is in the first event Hinder between current detection means and the second fault current detection device (such as Fig. 3 d) or the second fault current detection device and the Between three fault current detection devices (such as Fig. 3 c), then it is determined that fault point section 2 shown in Fig. 3 c at this time, similarly, When first detection time is less than the second detection time, fault point section 3 shown in Fig. 3 d.

In the above-described embodiments, when the time of fault current detection device detection fault traveling wave, fault traveling wave is preferably detected Time of the wave head as the fault traveling wave detected.

Further, Fisrt fault current detection means and third fault current detection device are relative to the second fault current Detection device is symmetrical arranged, feeder line fault localization method further include:

Obtain the length of the first branch.

Obtain the distance between Fisrt fault current detection means and the crosspoint of multiple branches.

According to the length of the first branch and apart from the velocity of wave for calculating fault traveling wave.

The distance between the end of branch where the fault point and fault point of velocity of wave computing electric line.

It is out of order after the specific section of generation according to above-described embodiment judgement, the range equation of respective section can be listed. If fault traveling wave spread speed be v, when failure occur in section 2 or section 3, can be according to Δ t_A1With Δ t_C1First calculate The size of traveling wave speed, may be expressed as:

Then Δ t in formula (2) is utilized_B1Calculate the distance for generation of being out of order.It is given below in the case of different section faults Total range equation:

The embodiment of the present invention installs three groups of fault current detection devices by distributed on multiple roads of power circuit, Detect that the time order and function of fault traveling wave judges failure by the Fisrt fault current detection means close to multiple branch crosspoints Branch；Then the time difference of the two neighboring fault traveling wave detected using three fault current detection devices on fault branch To be accurately positioned the fault point broken down.Through the embodiment of the present invention, it can be accurately positioned the fault point on power circuit, no It will receive the influence of line parameter circuit value and fault traveling wave catadioptric, to improve the accuracy of localization of fault.

The embodiment of the present invention is further expalined below in conjunction with example, as shown in Figure 4.

T-type line structure chart as shown in Figure 4, T are branch point, and the bus end of three branches is respectively M, N, P, send failure Position be f1, leg length is respectively 200km, 150km, 100km.Three Rogowski coils are installed as traveling wave in every branch road Detection device, as shown in A1, B1, C1, A2, B2, C2, A3, B3, C3 in figure, wherein A1, A2, A3 are first group of traveling wave detector dress It sets, they are equidistant away from node T；B1, B2, B3 are located at 3 midpoints branch MT, NT, PT, are second group of test point；C1, C2, C3 are symmetrical with A1, A2, A3 respectively using each branch midpoint B1, B2, B3 as symmetric points, are third group test point；First group Distance and third group test point distance apart from each bus of the test point apart from node T is equal, and is set as 10km.If each power transmission line The wave impedance on road is Z.

Singlephase earth fault occurs at distance T node 30km on branch MT, 10 ohm of fault resstance, detection point data is adopted Sample rate is 10MHz.The time that it detects fault traveling wave wave head can be obtained as t by carrying out analysis to first group of test point_A1= 0.2250665s, t_A2=0.2251332s, t_A3=0.2251332s, it can thus be appreciated that detection device A1 is firstly received fault traveling wave, Failure occurs on branch MT.

Then Δ t can be obtained according to A1, B1, C1 test point traveling wave information obtained_A1=66.8 μ s, Δ t_B1=200.4 μ s, Δt_C1=66.8 μ s, and it is unequal, and failure occurs between test point, and due to t_A3=0.2251332s, t_C1>t_A1, therefore therefore Barrier occur in section 3, by formula (6) it is found that failure occur in 170km, i.e., from bifurcation 30km at, error can almost neglect Slightly disregard.By a large amount of simulating, verifyings, which is usually no more than 60m.

The embodiment of the invention also provides a kind of electric line fault location devices.

The feeder line fault localization method of the embodiment of the present invention can through the embodiment of the present invention provided by power line Road fault locator executes, and the electric line fault location device of the embodiment of the present invention can be used for executing of the invention real Apply feeder line fault localization method provided by example.

Fig. 5 is the schematic diagram of electric line fault location device according to an embodiment of the present invention.The feeder line fault is fixed Power circuit in the method for position includes multiple branches, as shown, the electric line fault location device includes: the first acquisition list First 10, first judging unit 20, the first determination unit 30 and the second determination unit 40.

First acquisition unit 10 is for obtaining the time that multiple branches detect fault traveling wave.

First judging unit 20 is for judging that multiple roads detect whether the time of fault traveling wave is identical.

First determination unit 30 is used to determine electricity when the time for judging fault traveling wave that multiple branches detect is identical The fault point on line of force road is in the region where the crosspoint of multiple branches.

Second determination unit 40 is used to determine electricity in the time difference for judging fault traveling wave that multiple branches detect The fault point on line of force road is in the branch of earliest detection to fault traveling wave, wherein detects the device of fault traveling wave in multiple roads With it is all the same at a distance from crosspoint.

Preferably, it in order to further determine the position broken down, is respectively set on each road in multiple branches Faulty current detection means, each branch are disposed with Fisrt fault current detecting since the crosspoint of multiple branches Device, the second fault current detection device and third fault current detection device, electric line fault location device further include:

Second acquisition unit, for obtaining Fisrt fault current detection means detection Fisrt fault traveling wave and the second failed row The time difference of wave, it is poor at the first time to obtain, wherein Fisrt fault traveling wave and the second fault traveling wave are adjacent fault traveling wave.

Third acquiring unit, for obtaining the second fault current detection device detection Fisrt fault traveling wave and the second failed row The time difference of wave obtained for the second time difference.

4th acquiring unit, for obtaining third fault current detection device detection Fisrt fault traveling wave and the second failed row The time difference of wave obtains the third time difference.

Second judgment unit, for judging whether poor, the second time difference and third time difference are equal at the first time.

Third determination unit, for judging poor, the second time difference at the first time and when the unequal third time difference, really The fault point of power circuit is determined between Fisrt fault current detection means and third fault current detection device.

4th determination unit, for determining when judging poor, the second time difference at the first time and equal third time difference The fault point of power circuit is between Fisrt fault current detection means and the crosspoint of multiple branches, or is in third event Hinder the side in the two sides of current detection means far from the second fault current detection device,

Wherein, the midpoint of branch, Fisrt fault current detection means and third is arranged in the second fault current detection device Fault current detection device is symmetrical arranged relative to the second fault current detection device.

Since a branch road is provided with three fault current detection devices, then a branch is by three fault current detections Device is divided into four sections, and Fig. 3 a to Fig. 3 d shows the schematic diagram that four sections break down.Below in conjunction with Fig. 3 a to Fig. 3 d The specific location to break down determining in the electric line fault location device of the embodiment of the present invention is illustrated.

As shown in Figure 3a, when failure occurs in section 1, i.e. 0 < X≤Y

As shown in Figure 3b, when failure occurs in section 4, i.e. L-Y≤X < L

As shown in Figure 3c, when failure occurs in section 2, i.e. Y < X≤L/2

As shown in Figure 2 d, when failure occurs in section 3, i.e. L/2≤X < L-Y

It is available by formula (1)~(4): the electric line fault location device further include:

5th acquiring unit, in the fault point for determining power circuit in Fisrt fault current detection means and multiple Between the crosspoint of branch, the one of separate second fault current detection device in the two sides in third fault current detection device After side, the time of Fisrt fault current detection means detection Fisrt fault traveling wave is obtained, the first detection time is obtained.

6th acquiring unit is obtained for obtaining the time of third fault current detection device detection Fisrt fault traveling wave Second detection time.

Third judging unit, for judging the size of the first detection time and the second detection time.

5th determination unit, for determining power circuit when judging that the first detection time is greater than the second detection time Fault point in the two sides of third fault current detection device far from the second fault current detection device side.

It can also be obtained by formula (1)~(4): the electric line fault location device further include:

7th acquiring unit, in the fault point for determining power circuit in Fisrt fault current detection means and third After between fault current detection device, the time of Fisrt fault current detection means detection Fisrt fault traveling wave is obtained, is obtained First detection time.

8th acquiring unit is obtained for obtaining the time of third fault current detection device detection Fisrt fault traveling wave Second detection time.

4th judging unit, for judging the size of the first detection time and the second detection time.

7th determination unit, for determining power circuit when judging the first detection time less than the second detection time Fault point between Fisrt fault current detection means and the second fault current detection device.

8th determination unit, for determining power circuit when judging that the first detection time is greater than the second detection time Fault point between the second fault current detection device and third fault current detection device.

Further, Fisrt fault current detection means and third fault current detection device are relative to the second fault current Detection device is symmetrical arranged, electric line fault location device further include:

9th acquiring unit, for obtaining the length of the first branch.

Tenth acquiring unit, for obtain between Fisrt fault current detection means and the crosspoint of multiple branches away from From.

First computing unit, for the length according to the first branch and apart from the velocity of wave for calculating fault traveling wave.And

Second computing unit, the end for the branch where the fault point and fault point according to velocity of wave computing electric line The distance between.

The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.

Claims

1. a kind of feeder line fault localization method, the power circuit includes multiple branches, which is characterized in that the power line Road Fault Locating Method includes:

Obtain the time that the multiple branch detects fault traveling wave；

Judge the multiple branch road detects whether the time of the fault traveling wave is identical；

If it is judged that the time for the fault traveling wave that the multiple branch detects is identical, then the failure of the power circuit Point is in the region where the crosspoint of the multiple branch；And

If it is judged that the time for the fault traveling wave that the multiple branch detects is different, then the failure of the power circuit Branch of the point in earliest detection to the fault traveling wave；

Wherein, the device that the fault traveling wave is detected in the multiple branch road is all the same at a distance from the crosspoint；

Wherein, fault current detection device, each branch are respectively arranged on each road in the multiple branch Fisrt fault current detection means, the second fault current detection dress are disposed with since the crosspoint of the multiple branch It sets and third fault current detection device, the feeder line fault localization method further include: obtain the Fisrt fault electric current Detection device detects the time difference of Fisrt fault traveling wave and the second fault traveling wave, and it is poor at the first time to obtain, wherein first event Hinder traveling wave and second fault traveling wave is adjacent fault traveling wave；It obtains described in the second fault current detection device detection The time difference of Fisrt fault traveling wave and second fault traveling wave, obtained for the second time difference；Obtain the third fault current inspection The time difference that device detects the Fisrt fault traveling wave and second fault traveling wave is surveyed, the third time difference is obtained；Described in judgement Whether poor at the first time, described second time difference and the third time difference are equal；If it is judged that the first time is poor, institute It stated for the second time difference and the third time difference is unequal, it is determined that the fault point of the power circuit is in the Fisrt fault Between current detection means and the third fault current detection device；And if it is judged that the first time it is poor, described Second time difference and the third time difference are equal, it is determined that the fault point of the power circuit is in the Fisrt fault electric current Between detection device and the crosspoint of the multiple branch, or in the two sides in the third fault current detection device far Side from the second fault current detection device, wherein the Fisrt fault current detecting of each road fills Being equidistant away from the crosspoint is set, the midpoint of the branch, first event is arranged in the second fault current detection device Barrier current detection means and the third fault current detection device are symmetrically set relative to the second fault current detection device It sets；

Wherein, the multiple branch includes the first branch containing fault point, the feeder line fault localization method further include: Obtain the length of the first branch；It obtains between the Fisrt fault current detection means and the crosspoint of the multiple branch Distance；The velocity of wave of the fault traveling wave is calculated according to the length of the first branch and the distance；And according to the wave The distance between fault point and the end of branch where the fault point that speed calculates the power circuit.

2. feeder line fault localization method according to claim 1, which is characterized in that determining the power circuit Fault point is in the third failure between the Fisrt fault current detection means and the crosspoint of the multiple branch After side in the two sides of current detection means far from the second fault current detection device, the feeder line fault is fixed Position method include:

The time that the Fisrt fault current detection means detects the Fisrt fault traveling wave is obtained, the first detection time is obtained；

The time that the third fault current detection device detects the Fisrt fault traveling wave is obtained, the second detection time is obtained；

Judge the size of first detection time and second detection time；

If it is judged that first detection time is greater than second detection time, it is determined that the fault point of the power circuit Far from the side of the second fault current detection device in two sides in the third fault current detection device；And

If it is judged that first detection time is less than second detection time, it is determined that the fault point of the power circuit Between the Fisrt fault current detection means and the crosspoint of the multiple branch.

3. feeder line fault localization method according to claim 1, which is characterized in that determining the power circuit After fault point is between the Fisrt fault current detection means and the third fault current detection device, the electric power Line fault localization method includes:

Judge the size of first detection time and second detection time；

If it is judged that first detection time is less than second detection time, it is determined that the fault point of the power circuit Between the Fisrt fault current detection means and the second fault current detection device；And

If it is judged that first detection time is greater than second detection time, it is determined that the fault point of the power circuit Between the second fault current detection device and the third fault current detection device.

4. a kind of electric line fault location device, which is characterized in that the power circuit includes multiple branches, and feature exists In the electric line fault location device includes:

First acquisition unit detects the time of fault traveling wave for obtaining the multiple branch；

First judging unit, for judging the multiple branch road detects whether the time of the fault traveling wave is identical；

First determination unit, for when the time for judging the fault traveling wave that the multiple branch detects is identical, really The fault point of the fixed power circuit is in the region where the crosspoint of the multiple branch；And

Second determination unit, in the time difference for judging the fault traveling wave that the multiple branch detects, really The fault point of the fixed power circuit is in earliest detection to the branch of the fault traveling wave；

Wherein, fault current detection device, each branch are respectively arranged on each road in the multiple branch Fisrt fault current detection means, the second fault current detection dress are disposed with since the crosspoint of the multiple branch It sets and third fault current detection device, the electric line fault location device further include: second acquisition unit, for obtaining It the time difference of the detection of Fisrt fault current detection means the Fisrt fault traveling wave and the second fault traveling wave, obtains at the first time Difference, wherein the Fisrt fault traveling wave and second fault traveling wave are adjacent fault traveling wave；Third acquiring unit, is used for The time difference that the second fault current detection device detects the Fisrt fault traveling wave and second fault traveling wave is obtained, is obtained To the second time difference；4th acquiring unit detects the Fisrt fault row for obtaining the third fault current detection device The time difference of wave and second fault traveling wave, obtain the third time difference；Second judgment unit, for judging the first time Whether poor, described second time difference and the third time difference are equal；Third determination unit, for when judging described first Between poor, described second time difference and when the unequal third time difference, determine the fault point of the power circuit in described Between Fisrt fault current detection means and the third fault current detection device；And the 4th determination unit, for sentencing It is disconnected go out the first time is poor, second time difference and when the equal third time difference, determine the event of the power circuit Barrier point is between the Fisrt fault current detection means and the crosspoint of the multiple branch, or in the third event Hinder the side in the two sides of current detection means far from the second fault current detection device, wherein each road Fisrt fault current detection means being equidistant away from the crosspoint, the second fault current detection device setting At the midpoint of the branch, the Fisrt fault current detection means and the third fault current detection device are relative to described Second fault current detection device is symmetrical arranged；

Wherein, the multiple branch includes the first branch containing fault point, the electric line fault location device further include: 9th acquiring unit, for obtaining the length of the first branch；Tenth acquiring unit, for obtaining the Fisrt fault electric current The distance between detection device and the crosspoint of the multiple branch；First computing unit, for according to the first branch Length and the distance calculate the velocity of wave of the fault traveling wave；And second computing unit, for calculating institute according to the velocity of wave The distance between fault point and the end of branch where the fault point for stating power circuit.

5. electric line fault location device according to claim 4, which is characterized in that the feeder line fault positioning Device further include:

5th acquiring unit, for the fault point for determining the power circuit in the Fisrt fault current detection means and Between the crosspoint of the multiple branch, far from second failure in the two sides in the third fault current detection device After the side of current detection means, obtain the Fisrt fault current detection means detect the Fisrt fault traveling wave when Between, obtain the first detection time；

6th acquiring unit detects the time of the Fisrt fault traveling wave for obtaining the third fault current detection device, Obtain the second detection time；

Third judging unit, for judging the size of first detection time and second detection time；

5th determination unit, described in determining when judging that first detection time is greater than second detection time The fault point of power circuit is in the two sides of the third fault current detection device far from second fault current detection The side of device；And

6th determination unit, described in determining when judging that first detection time is less than second detection time The fault point of power circuit is between the Fisrt fault current detection means and the crosspoint of the multiple branch.

6. electric line fault location device according to claim 4, which is characterized in that the feeder line fault positioning Device further include:

7th acquiring unit, for the fault point for determining the power circuit in the Fisrt fault current detection means and After between the third fault current detection device, obtains the Fisrt fault current detection means and detect the Fisrt fault The time of traveling wave obtains the first detection time；

8th acquiring unit detects the time of the Fisrt fault traveling wave for obtaining the third fault current detection device, Obtain the second detection time；

4th judging unit, for judging the size of first detection time and second detection time；

7th determination unit, described in determining when judging that first detection time is less than second detection time The fault point of power circuit is between the Fisrt fault current detection means and the second fault current detection device；With And

8th determination unit, described in determining when judging that first detection time is greater than second detection time The fault point of power circuit is between the second fault current detection device and the third fault current detection device.

7. a kind of fault positioning system of power line characterized by comprising

Fault current detection device, be arranged on the power circuit, for obtain multiple branches detect fault traveling wave when Between, concurrent inspection measures the time of the fault traveling wave；

Wherein, fault current detection device include: on each branch road since the crosspoint of the multiple branch successively The Fisrt fault current detection means of setting, the second fault current detection device and third fault current detection device；

Wherein, Fisrt fault current detection means being equidistant away from the crosspoint of each branch road, second The midpoint of the branch, the Fisrt fault current detection means and third failure electricity is arranged in fault current detection device Flow detection device is symmetrical arranged relative to the second fault current detection device；And

Monitoring station judges described more for receiving the time for the fault traveling wave that the fault current detection device detects A branch road detects whether the time of the fault traveling wave is identical；If it is judged that the event that the multiple branch detects The time for hindering traveling wave is identical, then the fault point of the power circuit is in the region where the crosspoint of the multiple branch；With And if it is judged that the time for the fault traveling wave that the multiple branch detects it is different, then the fault point of the power circuit In earliest detection to the branch of the fault traveling wave, wherein the multiple branch road detect the device of the fault traveling wave with The distance in the crosspoint is all the same, and the multiple branch road detect the fault traveling wave device be defined as Fisrt fault electricity Flow detection device；

Wherein, the monitoring station is also used to, and obtains the Fisrt fault current detection means detection Fisrt fault traveling wave and second The time difference of fault traveling wave, it is poor at the first time to obtain, wherein the Fisrt fault traveling wave and second fault traveling wave are adjacent Fault traveling wave；It obtains the second fault current detection device and detects the Fisrt fault traveling wave and second fault traveling wave Time difference, obtained for the second time difference；It obtains the third fault current detection device and detects the Fisrt fault traveling wave and institute The time difference for stating the second fault traveling wave obtains the third time difference；Judge the poor first time, second time difference and described Whether the third time difference is equal；If it is judged that the first time is poor, second time difference and the third time difference not It is equal, it is determined that the fault point of the power circuit is in the Fisrt fault current detection means and the third fault current Between detection device；And if it is judged that the first time is poor, second time difference and the third time difference are equal, Then determine the fault point of the power circuit in the crosspoint of the Fisrt fault current detection means and the multiple branch Between, or in the two sides in the third fault current detection device far from the second fault current detection device one Side；

Wherein, the multiple branch includes the first branch containing fault point, and the monitoring station is also used to, and obtains described first The length on road；Obtain the distance between the Fisrt fault current detection means and crosspoint of the multiple branch；According to institute The length and the distance of stating the first branch calculate the velocity of wave of the fault traveling wave；And the electric power is calculated according to the velocity of wave The distance between the end of branch where the fault point of route and the fault point.