CN105021950A - Power line fault location method, device and system - Google Patents

Power line fault location method, device and system Download PDF

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Publication number
CN105021950A
CN105021950A CN201410158393.9A CN201410158393A CN105021950A CN 105021950 A CN105021950 A CN 105021950A CN 201410158393 A CN201410158393 A CN 201410158393A CN 105021950 A CN105021950 A CN 105021950A
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China
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fault
branch road
fault current
time
detection
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CN201410158393.9A
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Chinese (zh)
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CN105021950B (en
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叶宽
张祎果
周恺
李春生
杨国华
龚玲
刘亚东
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国家电网公司
国网北京市电力公司
四川中光防雷科技股份有限公司
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Abstract

The invention discloses a power line fault location method, a device and a system. A power line includes multiple branches. The power line fault location method comprises the following steps: acquiring the time when faulty traveling wave is detected on each of the multiple branches; judging whether the time for detecting the faulty traveling wave is the same for the multiple branches; determining that the fault point of the power line is in an area where the intersection of the multiple branches is located if judging that the time for detecting the faulty traveling wave is the same for the multiple branches; and determining that the fault point of the power line is on the branch on which faulty traveling wave is detected first if judging that the time for detecting the faulty traveling wave is not the same for the multiple branches, wherein the distance between faulty traveling wave detection devices on the multiple branches and the intersection is the same. By adopting the method, the device and the system of the invention, the problem that the position of a fault point of a line cannot be found accurately in the prior art is solved, and an effect of accurate line fault point finding is achieved.

Description

Feeder line fault localization method, Apparatus and system
Technical field
The present invention relates to power circuit field, in particular to a kind of feeder line fault localization method, Apparatus and system.
Background technology
The high speed development of electric power networks makes the application of T-type line get more and more, and its delivering power is high, and load is heavier, once breakdown loss also can be larger.The research of T-shaped feeder line fault location can shorten fault-time greatly, runs have great significance for power system safety and stability.
The difficult point of T-shaped feeder line fault location is the judgement of fault branch.Prior art mainly contains the method for two kinds of failure judgement branch roads, i.e. fault analytical method and traveling wave method.Fault analytical method is the electric current and voltage by T-type line three end, obtain the position of trouble spot, but precision cannot ensure and easily occur pseudo-root in computation process, is difficult to differentiation true and false by calculating each point voltage on Fault loop impedance or faulty line.Traveling wave method is the transient state travelling wave produced based on fault, according to the fault distance-finding method that theory of travelling wave realizes.Although this traveling wave method is not subject to the impact of line parameter circuit value fault type etc., for T-type line, due at circuit bifurcation T point, can there is catadioptric in fault traveling wave, therefore all can fault traveling wave be detected at three ends of T-shaped circuit, is difficult to the circuit that failure judgement occurs.
The shortcoming of prior art
First: fault analytical method technique computes is complicated, need the impact ignored distributed capacitance or be subject to transition resistance and line parameter circuit value, therefore precision is lower.
Second: due at circuit bifurcation T point, also can there is catadioptric in fault traveling wave, therefore all can fault traveling wave be detected at three ends of T-shaped circuit, and traveling wave method is difficult to the circuit that failure judgement occurs.
For the inaccurate problem in position of searching line fault point in prior art, at present effective solution is not yet proposed.
Summary of the invention
Fundamental purpose of the present invention is to provide a kind of feeder line fault localization method, Apparatus and system, to solve in prior art the inaccurate problem in position of searching line fault point.
To achieve these goals, according to an aspect of the present invention, a kind of feeder line fault localization method is provided.Feeder line fault localization method according to the present invention comprises: power circuit comprises multiple branch road, and feeder line fault localization method comprises: obtain the time that multiple branch road detects fault traveling wave; Judge that whether the time multiple branch road detecting fault traveling wave is identical; If judge that the time of the fault traveling wave that multiple branch road detects is identical, then the fault point of power circuit is in the region at the place, point of crossing of multiple branch road; And if judge that the time of the fault traveling wave that multiple branch road detects is different, then the fault point of power circuit is in earliest detection to the branch road of fault traveling wave, and wherein, on multiple branch road, the device of detection failure row ripple is all identical with the distance of point of crossing.
Further, each branch road in multiple branch road is respectively arranged with fault current detection device, each branch road is all disposed with Fisrt fault current sensing means, the second fault current detection device and the 3rd fault current detection device from the point of crossing of multiple branch road, feeder line fault localization method also comprises: obtain the mistiming that Fisrt fault current sensing means detects the capable ripple of Fisrt fault and the second fault traveling wave, obtain the very first time poor, wherein, the capable ripple of Fisrt fault and the second fault traveling wave are adjacent fault traveling wave, obtain the mistiming that the second fault current detection device detects the capable ripple of Fisrt fault and the second fault traveling wave, obtained for the second mistiming, obtain the mistiming that the 3rd fault current detection device detects the capable ripple of Fisrt fault and the second fault traveling wave, obtained for the 3rd mistiming, judge that the very first time is poor, whether the second mistiming is equal with the 3rd mistiming, if judge poor, the second mistiming very first time and the 3rd mistiming unequal, then determine that the fault point of power circuit is between Fisrt fault current sensing means and the 3rd fault current detection device, if and judge that the very first time is poor, second mistiming is equal with the 3rd mistiming, then determine that the fault point of power circuit is between Fisrt fault current sensing means and the point of crossing of multiple branch road, or be in the side away from the second fault current detection device in the both sides of the 3rd fault current detection device, wherein, Fisrt fault current sensing means on each branch road is equal apart from the distance of point of crossing, second fault current detection device is arranged on the mid point of branch road, Fisrt fault current sensing means and the 3rd fault current detection device are symmetrical arranged relative to the second fault current detection device.
Further, determining that the fault point of power circuit is between Fisrt fault current sensing means and the point of crossing of multiple branch road, be in the both sides of the 3rd fault current detection device away from after the side of the second fault current detection device, feeder line fault localization method comprises: obtain the time that Fisrt fault current sensing means detects the capable ripple of Fisrt fault, obtained for the first detection time; Obtain the time that the 3rd fault current detection device detects the capable ripple of Fisrt fault, obtained for the second detection time; Judge the size of the first detection time and the second detection time; If judge that the first detection time was greater than for the second detection time, then determine the fault point of power circuit side away from the second fault current detection device in the both sides of the 3rd fault current detection device; And if judge that the first detection time was less than for the second detection time, then determine that the fault point of power circuit is between Fisrt fault current sensing means and the point of crossing of multiple branch road.
Further, after determining that the fault point of power circuit is between Fisrt fault current sensing means and the 3rd fault current detection device, feeder line fault localization method comprises: obtain the time that Fisrt fault current sensing means detects the capable ripple of Fisrt fault, obtained for the first detection time; Obtain the time that the 3rd fault current detection device detects the capable ripple of Fisrt fault, obtained for the second detection time; Judge the size of the first detection time and the second detection time; If judge that the first detection time was less than for the second detection time, then determine that the fault point of power circuit is between Fisrt fault current sensing means and the second fault current detection device; And if judge that the first detection time was greater than for the second detection time, then determine that the fault point of power circuit is between the second fault current detection device and the 3rd fault current detection device.
Further, Fisrt fault current sensing means and the 3rd fault current detection device are symmetrical arranged relative to the second fault current detection device, and feeder line fault localization method also comprises: the length obtaining the first branch road; Obtain the distance between Fisrt fault current sensing means and the point of crossing of multiple branch road; According to the length of the first branch road and the velocity of wave of distance calculating fault traveling wave; And according to the distance between the trouble spot of velocity of wave computing electric line and the end of the branch road at place, trouble spot.
To achieve these goals, according to a further aspect in the invention, a kind of electric line fault location device is provided.Electric line fault location device according to the present invention comprises: power circuit comprises multiple branch road electric line fault location device and comprises: the first acquiring unit, the time of fault traveling wave detected for obtaining multiple branch road; Whether the first judging unit is identical for judging the time multiple branch road detecting fault traveling wave; First determining unit, for when judging that the time of the fault traveling wave that multiple branch road detects is identical, determines that the fault point of power circuit is in the region at the place, point of crossing of multiple branch road; And second determining unit, for when judging that the time of the fault traveling wave that multiple branch road detects is different, determine the fault point of power circuit in earliest detection to the branch road of fault traveling wave, wherein, on multiple branch road, the device of detection failure row ripple is all identical with the distance of point of crossing.
Further, each branch road in multiple branch road is respectively arranged with fault current detection device, each branch road is all disposed with Fisrt fault current sensing means, the second fault current detection device and the 3rd fault current detection device from the point of crossing of multiple branch road, electric line fault location device also comprises: second acquisition unit, the mistiming of the capable ripple of Fisrt fault and the second fault traveling wave is detected for obtaining Fisrt fault current sensing means, obtain the very first time poor, wherein, the capable ripple of Fisrt fault and the second fault traveling wave are adjacent fault traveling wave, 3rd acquiring unit, detecting the mistiming of the capable ripple of Fisrt fault and the second fault traveling wave, obtaining for the second mistiming for obtaining the second fault current detection device, 4th acquiring unit, detecting the mistiming of the capable ripple of Fisrt fault and the second fault traveling wave, obtaining for the 3rd mistiming for obtaining the 3rd fault current detection device, second judging unit, for judging that the very first time is poor, whether the second mistiming is equal with the 3rd mistiming, 3rd determining unit, for when judging poor, the second mistiming very first time and the 3rd mistiming is unequal, determines that the fault point of power circuit is between Fisrt fault current sensing means and the 3rd fault current detection device, and the 4th determining unit, for judging that the very first time is poor, when second mistiming is equal with the 3rd mistiming, determine that the fault point of power circuit is between Fisrt fault current sensing means and the point of crossing of multiple branch road, or be in the side away from the second fault current detection device in the both sides of the 3rd fault current detection device, wherein, Fisrt fault current sensing means on each branch road is equal apart from the distance of point of crossing, second fault current detection device is arranged on the mid point of branch road, Fisrt fault current sensing means and the 3rd fault current detection device are symmetrical arranged relative to the second fault current detection device.
Further, electric line fault location device also comprises: the 5th acquiring unit, for determining that the fault point of power circuit is between Fisrt fault current sensing means and the point of crossing of multiple branch road, be in the both sides of the 3rd fault current detection device away from after the side of the second fault current detection device, obtain the time that Fisrt fault current sensing means detects the capable ripple of Fisrt fault, obtained for the first detection time; 6th acquiring unit, detecting the time of the capable ripple of Fisrt fault, obtaining for the second detection time for obtaining the 3rd fault current detection device; 3rd judging unit, for judging the size of the first detection time and the second detection time; 5th determining unit, for when judging that the first detection time was greater than for the second detection time, determines the fault point of power circuit side away from the second fault current detection device in the both sides of the 3rd fault current detection device; And
6th determining unit, for when judging that the first detection time was less than for the second detection time, determines that the fault point of power circuit is between Fisrt fault current sensing means and the point of crossing of multiple branch road.
Further, electric line fault location device also comprises: the 7th acquiring unit, for after determining that the fault point of power circuit is between Fisrt fault current sensing means and the 3rd fault current detection device, obtain the time that Fisrt fault current sensing means detects the capable ripple of Fisrt fault, obtained for the first detection time; 8th acquiring unit, detecting the time of the capable ripple of Fisrt fault, obtaining for the second detection time for obtaining the 3rd fault current detection device; 4th judging unit, for judging the size of the first detection time and the second detection time; 7th determining unit, for when judging that the first detection time was less than for the second detection time, determines that the fault point of power circuit is between Fisrt fault current sensing means and the second fault current detection device; And the 8th determining unit, for when judging that the first detection time was greater than for the second detection time, determine that the fault point of power circuit is between the second fault current detection device and the 3rd fault current detection device.
Further, Fisrt fault current sensing means and the 3rd fault current detection device are symmetrical arranged relative to the second fault current detection device, and electric line fault location device also comprises: the 9th acquiring unit, for obtaining the length of the first branch road; Tenth acquiring unit, for obtain Fisrt fault current sensing means and multiple branch road point of crossing between distance; First computing unit, for the length according to the first branch road with apart from the velocity of wave calculating fault traveling wave; And second computing unit, for according to the distance between the trouble spot of velocity of wave computing electric line and the end of the branch road at place, trouble spot.
To achieve these goals, according to an aspect of the present invention, a kind of fault positioning system of power line is provided.Fault positioning system of power line according to the present invention comprises: fault current detection device, is arranged on power circuit, the time of fault traveling wave detected for obtaining multiple branch road, and concurrent censorship measures the time of fault traveling wave; And
Monitoring station, for receiving the time of the fault traveling wave that fault current detection device detects, judges that whether the time multiple branch road detecting fault traveling wave is identical; If judge that the time of the fault traveling wave that multiple branch road detects is identical, then the fault point of power circuit is in the region at the place, point of crossing of multiple branch road; And if judge that the time of the fault traveling wave that multiple branch road detects is different, then the fault point of power circuit is in earliest detection to the branch road of fault traveling wave, and wherein, on multiple branch road, the device of detection failure row ripple is all identical with the distance of point of crossing.
By the present invention, adopt power circuit to comprise multiple branch road, obtain the time that multiple branch road detects fault traveling wave; Judge that whether the time multiple branch road detecting fault traveling wave is identical; If judge that the time of the fault traveling wave that multiple branch road detects is identical, then the fault point of power circuit is in the region at the place, point of crossing of multiple branch road; And if judge that the time of the fault traveling wave that multiple branch road detects is different, then the fault point of power circuit is in earliest detection to the method for the branch road of fault traveling wave, solve in prior art the inaccurate problem in position of searching line fault point, and then reach the effect of accurately searching line fault point.
Accompanying drawing explanation
The accompanying drawing forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the schematic diagram of the fault positioning system of power line according to the embodiment of the present invention;
Fig. 2 is the process flow diagram of the feeder line fault localization method according to the embodiment of the present invention;
Fig. 3 a is the schematic diagram that in the feeder line fault localization method according to the embodiment of the present invention, section 1 breaks down;
Fig. 3 b is the schematic diagram that in the feeder line fault localization method according to the embodiment of the present invention, section 4 breaks down;
Fig. 3 c is the schematic diagram that in the feeder line fault localization method according to the embodiment of the present invention, section 2 breaks down;
Fig. 3 d is the schematic diagram that in the feeder line fault localization method according to the embodiment of the present invention, section 3 breaks down;
Fig. 4 is the schematic diagram of the preferred exemplary of feeder line fault localization method according to the embodiment of the present invention; And
Fig. 5 is the schematic diagram of the electric line fault location device according to the embodiment of the present invention.
Embodiment
It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
The present invention program is understood better in order to make those skilled in the art person, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the embodiment of a part of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, should belong to the scope of protection of the invention.
It should be noted that, term " first ", " second " etc. in instructions of the present invention and claims and above-mentioned accompanying drawing are for distinguishing similar object, and need not be used for describing specific order or precedence.Should be appreciated that the data used like this can be exchanged in the appropriate case, so as embodiments of the invention described herein can with except here diagram or describe those except order implement.In addition, term " comprises " and " having " and their any distortion, intention is to cover not exclusive comprising, such as, contain those steps or unit that the process of series of steps or unit, method, system, product or equipment is not necessarily limited to clearly list, but can comprise clearly do not list or for intrinsic other step of these processes, method, product or equipment or unit.
The invention provides a kind of fault positioning system of power line.
Fig. 1 is the schematic diagram of the fault positioning system of power line according to the embodiment of the present invention.As shown in Figure 1, this fault positioning system of power line comprises three branch roads, and the bus end of three branch roads is respectively transformer station M, transformer station N, transformer station P, and every bar branch road all comprises fault current detection device, and this power failure positioning system also comprises monitoring station.
Fault current detection device, is arranged on power circuit, and for detecting the fault traveling wave of power circuit, concurrent censorship measures the time of fault traveling wave.
Monitoring station, for receiving the time of the fault traveling wave that fault current detection device detects, and determines the position residing for trouble spot of power circuit according to the time of the fault traveling wave detected.
Power circuit comprises multiple branch road, and each branch road is provided with fault current detection device, and the fault current detection device that a branch road is arranged is one or three, is preferably three.When each branch road only arranges a fault current detection device, the fault current detection device that each branch road is arranged is equal apart from the distance of point of crossing, like this, because fault current velocity of propagation is identical, according to the time that the fault current detection device that each branch road is arranged detects, can branch road residing for the localization of faults.Each branch road arranges the situation of three fault current detection devices, the branch road residing for trouble spot can not only be detected, which position of trouble spot at fault branch can also be detected.The setting of three fault current detection devices on each branch road as shown in Figure 1.
Power circuit shown in Fig. 1 comprises the first branch road, the second branch road and the 3rd branch road, and each branch road is provided with three fault current detection devices, is respectively Fisrt fault current sensing means, the second fault current detection device and the 3rd fault current detection device.Wherein, second fault current detection device is installed on the mid point of its place branch road, Fisrt fault current sensing means and the 3rd fault current detection device are symmetricly set in its place branch road relative to the second fault current detection device, because Fisrt fault current sensing means and the 3rd fault current detection device are symmetrical arranged relative to the second fault current detection device, therefore, the 3rd fault current detection device is identical with the distance of Fisrt fault current sensing means and point of crossing apart from the end of its place branch road.Because the Fisrt fault current sensing means on three branch roads is equal with the distance of bifurcation T, therefore, the 3rd fault current detection device is equal with the distance of the end of its place circuit.As Fig. 1, fault current detection device A1 on first branch road, fault current detection device A2 on second branch road is identical with the distance of the point of crossing T of fault current detection device A3 distance three branch roads on the 3rd branch road, second fault current detection device B1, second fault current detection device B2 and the second fault current detection device B3 is respectively the mid point of the first branch road, the mid point of the second branch road and the mid point of the 3rd branch road, 3rd fault current detection device C1 and Fisrt fault current sensing means A1 is symmetrical relative to the second fault current detection device B1, in like manner, 3rd fault current detection device C2 and Fisrt fault current sensing means A2 is symmetrical relative to the second fault current detection device B2, 3rd fault current detection device C3 and Fisrt fault current sensing means A3 is symmetrical relative to the second fault current detection device B3.
After fault current detection device on branch road detects fault traveling wave, will detect that the time of fault traveling wave is sent to monitoring station by cordless communication network, according to each branch road, monitoring station detects that the time of fault traveling wave determines to send out into the branch road of fault.
Preferably, in order to improve the accuracy rate of detection failure row ripple, can determine by the wave head of detection failure row ripple time fault traveling wave being detected.When determining which bar branch road breaks down, can a fault current detection device be only set on each branch road, in order to determine when which particular location of branch road breaks down, the position of breaking down can be determined by three fault current detection devices on a branch road.
Do you so, how to determine the branch road that fault occurs and the position on branch road? embodiments provide a kind of feeder line fault localization method.The trouble spot on the branch road that power circuit breaks down and branch road can be determined by this feeder line fault localization method.
Fig. 2 is the process flow diagram of the feeder line fault localization method according to the embodiment of the present invention.Power circuit in this feeder line fault localization method comprises multiple branch road, and as shown in the figure, this feeder line fault localization method comprises the steps:
Step S102, obtains the time that multiple branch road detects fault traveling wave.
When power circuit breaks down, each branch road can detect fault traveling wave, but the position occurred due to fault is different from the distance of the check point of each fault traveling wave, and the device of detection failure row ripple is identical apart from the distance of point of crossing, therefore, each check point detects that the time of fault traveling wave may be different.
Step S104, judges that whether the time multiple branch road detecting fault traveling wave is identical.
Judge that whether the time multiple branch road detecting fault traveling wave is identical, and determine the branch road that breaks down according to judged result.Preferably, the time of check point can be arrived by the wave head detection failure row ripple of detection failure row ripple.
Step S106, if judge that the time of the fault traveling wave that multiple branch road detects is identical, then the fault point of power circuit is in the region at the place, point of crossing of multiple branch road.
If judge that the time of the fault traveling wave that multiple branch road detects is identical, in the multiple branch road of the positional distance then broken down, the distance of the check point of each branch road is all identical, so, only the distance of the fault detecting point of the multiple branch road of intersection of multiple branch roads of power circuit is identical, namely determines that the fault point of power circuit is in the region at the place, point of crossing of multiple branch road.
Step S108, if judge that the time of the fault traveling wave that multiple branch road detects is different, then the fault point of power circuit is in earliest detection to the branch road of fault traveling wave, and wherein, on multiple branch road, the device of detection failure row ripple is all identical with the distance of point of crossing.
Because the check point on the branch road that breaks down is nearest apart from the trouble spot of this branch road, if judge that the time of the fault traveling wave that multiple branch road detects is different, then determine the fault point of power circuit in earliest detection to the branch road of fault traveling wave.
It should be noted that, when judging that whether the time of the fault traveling wave that multiple branch road detects is identical, on multiple branch road, the check point of detection failure row ripple is identical with the distance of the point of crossing of multiple branch road, preferably, the nearest fault traveling wave pick-up unit in the distance point of crossing on each branch road can be selected to detect.The check point of the fault traveling wave in this embodiment can be the fault current detection device in the fault positioning system of power line in the embodiment of the present invention.
Pass through above-described embodiment, can according to the time of arrival of the check point detection failure row ripple of the fault traveling wave on multiple branch road, because on each branch road, the pick-up unit of detection failure row ripple is identical with the distance of point of crossing, therefore nearer apart from which pick-up unit according to the time failure judgement point detected, namely by judge multiple branch road detect the time of fault traveling wave whether identical come the position at failure judgement point place, if judge that time fault traveling wave being detected is identical, then determine that fault occurs in the point of crossing of multiple branch road, if judge that time fault traveling wave being detected is different, then determine that fault occurs in earliest detection on the branch road of fault traveling wave.Detecting that the time of fault traveling wave determines the branch road that fault occurs by comparing, not by the impact of line fault type, and without the need to complicated calculations, avoiding the impact of line parameter circuit value on result of calculation, thus improve the accuracy rate of looking up the fault point.
Preferably, in order to determine the position of breaking down further, each branch road in multiple branch road is respectively arranged with fault current detection device, each branch road is all disposed with Fisrt fault current sensing means, the second fault current detection device and the 3rd fault current detection device from the point of crossing of multiple branch road, and this feeder line fault localization method also comprises:
Obtain the mistiming that Fisrt fault current sensing means detects the capable ripple of Fisrt fault and the second fault traveling wave, obtain the very first time poor, wherein, the capable ripple of Fisrt fault and the second fault traveling wave are adjacent fault traveling wave.
Obtain the mistiming that the second fault current detection device detects the capable ripple of Fisrt fault and the second fault traveling wave, obtained for the second mistiming.
Obtain the mistiming that the 3rd fault current detection device detects the capable ripple of Fisrt fault and the second fault traveling wave, obtained for the 3rd mistiming.
Judge that the very first time is poor, whether the second mistiming is equal with the 3rd mistiming.
If judge poor, the second mistiming very first time and the 3rd mistiming unequal, then determine that the fault point of power circuit is between Fisrt fault current sensing means and the 3rd fault current detection device.
If judge that the very first time is poor, the second mistiming is equal with the 3rd mistiming, then determine that the fault point of power circuit is between Fisrt fault current sensing means and the point of crossing of multiple branch road, or away from the side of the second fault current detection device in the both sides being in the 3rd fault current detection device.
Be disposed with Fisrt fault current sensing means, the second fault current detection device and the 3rd fault current detection device on the first leg, second fault current detection device is arranged on the mid point of branch road, and Fisrt fault current sensing means and the 3rd fault current detection device are symmetrical arranged relative to the second fault current detection device.
Fisrt fault current sensing means, the second fault current detection device and the 3rd fault current detection device detect the time of the capable ripple of Fisrt fault and the second fault traveling wave respectively, according to the position of mistiming failure judgement point adjacent two fault traveling waves being detected.
If judge poor, the second mistiming very first time and the 3rd mistiming unequal, then determine that the fault point of power circuit is between Fisrt fault current sensing means and the 3rd fault current detection device.If judge that the very first time is poor, the second mistiming is equal with the 3rd mistiming, then determine that the fault point of power circuit is between Fisrt fault current sensing means and the point of crossing of multiple branch road, or away from the side of the second fault current detection device in the both sides being in the 3rd fault current detection device.
It should be noted that, this embodiment is only described feeder line fault localization method of the present invention for the first branch road, in like manner can push away, and other branch roads also can according to the position of the method localization of faults of the first branch road.
Due to a branch road being provided with three fault current detection devices, then a branch road is divided into four sections by three fault current detection devices, and Fig. 3 a to Fig. 3 d shows the schematic diagram that four sections break down.Determine that the particular location broken down is described below in conjunction with Fig. 3 a to Fig. 3 d in the feeder line fault localization method of the embodiment of the present invention.
Branch road MT is arbitrary fault branch, Fisrt fault current sensing means A1, the second fault current detection device B1 and the 3rd fault current detection device C1 are three groups of check points that the first branch road is installed, wherein the second fault current detection device B1 is positioned at circuit mid point, Fisrt fault current sensing means A1 and the 3rd fault current detection device C1 is positioned at fault branch two ends symmetric position, if MC1=A1T=Y, trouble spot is X to the distance of M.If the mistiming that the first two row ripple that A1, B1 and C1 place detects arrives is respectively Δ t a1, Δ t b1with Δ t c1,
When circuit is in different section fault, the mistiming of A1, B1 and C1 meets following rule:
As shown in Figure 3 a, when fault occurs in section 1, namely during 0<X≤Y
&Delta;t A 1 = 2 X / v &Delta;t B 1 = 2 X / v &Delta;t C 1 = 2 X / v - - - ( 1 )
As shown in Figure 3 b, when fault occurs in section 4, namely during L-Y≤X<L
&Delta;t A 1 = 2 ( L - X ) / v &Delta;t B 1 = 2 ( L - X ) / v &Delta;t C 1 = 2 ( L - X ) / v - - - ( 2 )
As shown in Figure 3 c, when fault occurs in section 2, namely during Y<X≤L/2
&Delta;t A 1 = 2 Y / v &Delta;t B 1 = 2 X / v &Delta;t C 1 = 2 Y / v - - - ( 3 )
As shown in Figure 2 d, when fault occurs in section 3, namely during L/2≤X<L-Y
&Delta;t A 1 = 2 ( L - Y ) / v &Delta;t B 1 = 2 ( L - X ) / v &Delta;t C 1 = 2 ( L - Y ) / v
Can be obtained by formula (1) ~ (4): determining that the fault point of power circuit is between Fisrt fault current sensing means and the point of crossing of multiple branch road, or be in away from after the side of the second fault current detection device in the both sides of the 3rd fault current detection device, feeder line fault localization method comprises:
Obtain the time that Fisrt fault current sensing means detects the capable ripple of Fisrt fault, obtained for the first detection time.
Obtain the time that the 3rd fault current detection device detects the capable ripple of Fisrt fault, obtained for the second detection time.
Judge the size of the first detection time and the second detection time.
If judge that the first detection time was greater than for the second detection time, then determine the fault point of power circuit side away from the second fault current detection device in the both sides of the 3rd fault current detection device.
If judge that the first detection time was less than for the second detection time, then determine that the fault point of power circuit is between Fisrt fault current sensing means and the point of crossing of multiple branch road.
Determine the fault point of power circuit between Fisrt fault current sensing means and the point of crossing of multiple branch road (as Fig. 3 a), or be in the both sides of the 3rd fault current detection device away from after the side (as Fig. 3 b) of the second fault current detection device, judge the size of the first detection time and the second detection time, if judge that the first detection time was greater than for the second detection time, then determine the fault point of power circuit side away from the second fault current detection device in the both sides of the 3rd fault current detection device.If judge that the first detection time was less than for the second detection time, then determine that the fault point of power circuit is between Fisrt fault current sensing means and the point of crossing of multiple branch road.
After getting the first detection time and the second detection time, if the first detection time was greater than for the second detection time, so, the distance that fault traveling wave is transmitted to Fisrt fault pick-up unit is greater than the distance being transmitted to the 3rd failure detector, namely distance the 3rd failure detector in trouble spot is nearer, again due to determine the fault point of power circuit in the both sides of the 3rd fault current detection device away from the second fault current detection device side (as Fig. 3 a), or between the point of crossing being in Fisrt fault current sensing means and multiple branch road (as Fig. 3 b), so determine that now fault point is in the section 1 shown in Fig. 3 a, in like manner, when being less than for the second detection time the first detection time, fault point is in the section 4 shown in figure b.
After determining that the fault point of power circuit is between Fisrt fault current sensing means and the 3rd fault current detection device, feeder line fault localization method comprises:
Obtain the time that Fisrt fault current sensing means detects the capable ripple of Fisrt fault, obtained for the first detection time.
Obtain the time that the 3rd fault current detection device detects the capable ripple of Fisrt fault, obtained for the second detection time.
Judge the size of the first detection time and the second detection time.
If judge that the first detection time was less than for the second detection time, then determine that the fault point of power circuit is between Fisrt fault current sensing means and the second fault current detection device.
If judge that the first detection time was greater than for the second detection time, then determine that the fault point of power circuit is between the second fault current detection device and the 3rd fault current detection device.
Between Fisrt fault current sensing means and the second fault current detection device (as Fig. 3 d), or to be between the second fault current detection device and the 3rd fault current detection device after (as Fig. 3 c), judge the size of the first detection time and the second detection time, if judge that the first detection time was less than for the second detection time, then determine that the fault point of power circuit is between Fisrt fault current sensing means and the second fault current detection device.If judge that the first detection time was greater than for the second detection time, then determine that the fault point of power circuit is between the second fault current detection device and the 3rd fault current detection device.
After getting the first detection time and the second detection time, if the first detection time was greater than for the second detection time, so, the distance that fault traveling wave is transmitted to Fisrt fault pick-up unit is greater than the distance being transmitted to the 3rd failure detector, namely distance the 3rd failure detector in trouble spot is nearer, again owing to determining the fault point of power circuit (as Fig. 3 d) between Fisrt fault current sensing means and the second fault current detection device, or between the second fault current detection device and the 3rd fault current detection device (as Fig. 3 c), so determine that now fault point is in the section 2 shown in Fig. 3 c, in like manner, when being less than for the second detection time the first detection time, fault point is in the section 3 shown in Fig. 3 d.
In the above-described embodiments, during time of fault current detection device detection failure row ripple, the wave head of preferred detection fault traveling wave is as the time of the fault traveling wave detected.
Further, Fisrt fault current sensing means and the 3rd fault current detection device are symmetrical arranged relative to the second fault current detection device, and feeder line fault localization method also comprises:
Obtain the length of the first branch road.
Obtain the distance between Fisrt fault current sensing means and the point of crossing of multiple branch road.
According to the length of the first branch road and the velocity of wave of distance calculating fault traveling wave.
According to the distance between the trouble spot of velocity of wave computing electric line and the end of the branch road at place, trouble spot.
After judging according to above-described embodiment the concrete section that fault occurs, the range equation of respective section can be listed.If fault traveling wave velocity of propagation is v, when fault occurs in section 2 or section 3, can according to Δ t a1with Δ t c1first calculate the size of traveling wave speed, can be expressed as:
Then Δ t in formula (2) is utilized b1calculate the distance that fault occurs.Below provide the total range equation under different section failure condition:
( &Delta;t A 1 + &Delta;t B 1 + &Delta;t C 1 ) v 6 ( X < Y ) 2 &Delta;t B 1 &Delta;t A 1 + &Delta;t C 1 Y ( Y < X &le; L / 2 ) L - 2 &Delta;t B 1 &Delta;t A 1 + &Delta;t C 1 Y ( L / 2 < X &le; L - Y ) L - ( &Delta;t A 1 + &Delta;t B 1 + &Delta;t C 1 ) v 6 ( L - Y < X ) - - - ( 6 )
The embodiment of the present invention, by distributed installation three groups of fault current detection devices on multiple branch roads of power circuit, detects the time order and function failure judgement branch of fault traveling wave by the Fisrt fault current sensing means of close multiple branch road point of crossing; The mistiming of adjacent two fault traveling waves then utilizing on fault branch three fault current detection devices to detect accurately locates the trouble spot of breaking down.By the embodiment of the present invention, accurately can locate the trouble spot on power circuit, line parameter circuit value and the catadioptric impact of fault traveling wave can not be subject to, thus improve the accuracy of localization of fault.
Below in conjunction with example, the embodiment of the present invention is further expalined, as shown in Figure 4.
T-type line structural drawing as shown in Figure 4, T is take-off point, and the bus end of three branch roads is respectively M, N, P, and transmission location of fault is f1, and leg length is respectively 200km, 150km, 100km.Every bar branch road is installed three Luo-coils as traveling wave detector 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 device, they apart from node T apart from equal; B1, B2, B3 lay respectively at 3 branch road MT, NT, PT mid points, are second group of check point; C1, C2, C3 respectively with each branch road mid point B1, B2, B3 for symmetric points, symmetrical with A1, A2, A3, be the 3rd group of check point; Distance geometry the 3rd group of check point of first group of check point distance node T is all equal apart from the distance of each bus, is set to 10km.If the wave impedance of each transmission line of electricity is Z.
There is singlephase earth fault in distance T node 30km place on branch road MT, and fault resstance 10 ohm, check point data sampling rate is 10MHz.By carrying out first group of check point analyzing, can to obtain its time fault traveling wave wave head being detected be t a1=0.2250665s, t a2=0.2251332s, t a3=0.2251332s, it can thus be appreciated that first pick-up unit A1 receives fault traveling wave, fault occurs on branch road MT.
Then the row ripple information obtained according to A1, B1, C1 check point can obtain Δ t a1=66.8 μ s, Δ t b1=200.4 μ s, Δ t c1=66.8 μ s, it is also unequal, and fault occurs between check point, again due to t a3=0.2251332s, t c1>t a1, therefore fault occurs in section 3, and from formula (6), fault occurs in 170km place, and namely separate crunode 30km place, error is almost negligible.By a large amount of simulating, verifying, this algorithm positioning error is very little, is generally no more than 60m.
The embodiment of the present invention additionally provides a kind of electric line fault location device.
The electric line fault location device that the feeder line fault localization method of the embodiment of the present invention can be provided by the embodiment of the present invention performs, and the electric line fault location device of the embodiment of the present invention also may be used for performing the feeder line fault localization method that the embodiment of the present invention provides.
Fig. 5 is the schematic diagram of the electric line fault location device according to the embodiment of the present invention.Power circuit in this feeder line fault localization method comprises multiple branch road, and as shown in the figure, this electric line fault location device comprises: the first acquiring unit 10, first judging unit 20, first determining unit 30 and the second determining unit 40.
First acquiring unit 10 detects the time of fault traveling wave for obtaining multiple branch road.
When power circuit breaks down, each branch road can detect fault traveling wave, but the position occurred due to fault is different from the distance of the check point of each fault traveling wave, and the device of detection failure row ripple is identical apart from the distance of point of crossing, therefore, each check point detects that the time of fault traveling wave may be different.
Whether the first judging unit 20 is identical for judging the time multiple branch road detecting fault traveling wave.
Judge that whether the time multiple branch road detecting fault traveling wave is identical, and determine the branch road that breaks down according to judged result.Preferably, the time of check point can be arrived by the wave head detection failure row ripple of detection failure row ripple.
First determining unit 30, for when judging that the time of the fault traveling wave that multiple branch road detects is identical, determines that the fault point of power circuit is in the region at the place, point of crossing of multiple branch road.
If judge that the time of the fault traveling wave that multiple branch road detects is identical, in the multiple branch road of the positional distance then broken down, the distance of the check point of each branch road is all identical, so, only the distance of the fault detecting point of the multiple branch road of intersection of multiple branch roads of power circuit is identical, namely determines that the fault point of power circuit is in the region at the place, point of crossing of multiple branch road.
Second determining unit 40 is for when judging that the time of the fault traveling wave that multiple branch road detects is different, determine the fault point of power circuit in earliest detection to the branch road of fault traveling wave, wherein, on multiple branch road, the device of detection failure row ripple is all identical with the distance of point of crossing.
Because the check point on the branch road that breaks down is nearest apart from the trouble spot of this branch road, if judge that the time of the fault traveling wave that multiple branch road detects is different, then determine the fault point of power circuit in earliest detection to the branch road of fault traveling wave.
It should be noted that, when judging that whether the time of the fault traveling wave that multiple branch road detects is identical, on multiple branch road, the check point of detection failure row ripple is identical with the distance of the point of crossing of multiple branch road, preferably, the nearest fault traveling wave pick-up unit in the distance point of crossing on each branch road can be selected to detect.The check point of the fault traveling wave in this embodiment can be the fault current detection device in the fault positioning system of power line in the embodiment of the present invention.
Pass through above-described embodiment, can according to the time of arrival of the check point detection failure row ripple of the fault traveling wave on multiple branch road, because on each branch road, the pick-up unit of detection failure row ripple is identical with the distance of point of crossing, therefore nearer apart from which pick-up unit according to the time failure judgement point detected, namely by judge multiple branch road detect the time of fault traveling wave whether identical come the position at failure judgement point place, if judge that time fault traveling wave being detected is identical, then determine that fault occurs in the point of crossing of multiple branch road, if judge that time fault traveling wave being detected is different, then determine that fault occurs in earliest detection on the branch road of fault traveling wave.Detecting that the time of fault traveling wave determines the branch road that fault occurs by comparing, not by the impact of line fault type, and without the need to complicated calculations, avoiding the impact of line parameter circuit value on result of calculation, thus improve the accuracy rate of looking up the fault point.
Preferably, in order to determine the position of breaking down further, each branch road in multiple branch road is respectively arranged with fault current detection device, each branch road is all disposed with Fisrt fault current sensing means, the second fault current detection device and the 3rd fault current detection device from the point of crossing of multiple branch road, and electric line fault location device also comprises:
Second acquisition unit, detect the mistiming of the capable ripple of Fisrt fault and the second fault traveling wave for obtaining Fisrt fault current sensing means, obtain the very first time poor, wherein, the capable ripple of Fisrt fault and the second fault traveling wave are adjacent fault traveling wave.
3rd acquiring unit, detecting the mistiming of the capable ripple of Fisrt fault and the second fault traveling wave, obtaining for the second mistiming for obtaining the second fault current detection device.
4th acquiring unit, detecting the mistiming of the capable ripple of Fisrt fault and the second fault traveling wave, obtaining for the 3rd mistiming for obtaining the 3rd fault current detection device.
Second judging unit, for judging that the very first time is poor, whether the second mistiming is equal with the 3rd mistiming.
3rd determining unit, for when judging poor, the second mistiming very first time and the 3rd mistiming is unequal, determines that the fault point of power circuit is between Fisrt fault current sensing means and the 3rd fault current detection device.
4th determining unit, for judging that poor, the second mistiming very first time is time equal with the 3rd mistiming, determine that the fault point of power circuit is between Fisrt fault current sensing means and the point of crossing of multiple branch road, or be in the side away from the second fault current detection device in the both sides of the 3rd fault current detection device
Wherein, the second fault current detection device is arranged on the mid point of branch road, and Fisrt fault current sensing means and the 3rd fault current detection device are symmetrical arranged relative to the second fault current detection device.
Be disposed with Fisrt fault current sensing means, the second fault current detection device and the 3rd fault current detection device on the first leg, second fault current detection device is arranged on the mid point of branch road, and Fisrt fault current sensing means and the 3rd fault current detection device are symmetrical arranged relative to the second fault current detection device.
Fisrt fault current sensing means, the second fault current detection device and the 3rd fault current detection device detect the time of the capable ripple of Fisrt fault and the second fault traveling wave respectively, according to the position of mistiming failure judgement point adjacent two fault traveling waves being detected.
If judge poor, the second mistiming very first time and the 3rd mistiming unequal, then determine that the fault point of power circuit is between Fisrt fault current sensing means and the 3rd fault current detection device.If judge that the very first time is poor, the second mistiming is equal with the 3rd mistiming, then determine that the fault point of power circuit is between Fisrt fault current sensing means and the point of crossing of multiple branch road, or away from the side of the second fault current detection device in the both sides being in the 3rd fault current detection device.
It should be noted that, this embodiment is only described feeder line fault localization method of the present invention for the first branch road, in like manner can push away, and other branch roads also can according to the position of the method localization of faults of the first branch road.
Due to a branch road being provided with three fault current detection devices, then a branch road is divided into four sections by three fault current detection devices, 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 particular location determining to break down in the electric line fault location device of the embodiment of the present invention is described.
Branch road MT is arbitrary fault branch, Fisrt fault current sensing means A1, the second fault current detection device B1 and the 3rd fault current detection device C1 are three groups of check points that the first branch road is installed, wherein the second fault current detection device B1 is positioned at circuit mid point, Fisrt fault current sensing means A1 and the 3rd fault current detection device C1 is positioned at fault branch two ends symmetric position, if MC1=A1T=Y, trouble spot is X to the distance of M.If the mistiming that the first two row ripple that A1, B1 and C1 place detects arrives is respectively Δ t a1, Δ t b1with Δ t c1,
When circuit is in different section fault, the mistiming of A1, B1 and C1 meets following rule:
As shown in Figure 3 a, when fault occurs in section 1, namely during 0<X≤Y
&Delta;t A 1 = 2 X / v &Delta;t B 1 = 2 X / v &Delta;t C 1 = 2 X / v - - - ( 1 )
As shown in Figure 3 b, when fault occurs in section 4, namely during L-Y≤X<L
&Delta;t A 1 = 2 ( L - X ) / v &Delta;t B 1 = 2 ( L - X ) / v &Delta;t C 1 = 2 ( L - X ) / v - - - ( 2 )
As shown in Figure 3 c, when fault occurs in section 2, namely during Y<X≤L/2
&Delta;t A 1 = 2 Y / v &Delta;t B 1 = 2 X / v &Delta;t C 1 = 2 Y / v - - - ( 3 )
As shown in Figure 2 d, when fault occurs in section 3, namely during L/2≤X<L-Y
&Delta;t A 1 = 2 ( L - Y ) / v &Delta;t B 1 = 2 ( L - X ) / v &Delta;t C 1 = 2 ( L - Y ) / v
Can be obtained by formula (1) ~ (4): this electric line fault location device also comprises:
5th acquiring unit, for determining that the fault point of power circuit is between Fisrt fault current sensing means and the point of crossing of multiple branch road, be in the both sides of the 3rd fault current detection device away from after the side of the second fault current detection device, obtain the time that Fisrt fault current sensing means detects the capable ripple of Fisrt fault, obtained for the first detection time.
6th acquiring unit, detecting the time of the capable ripple of Fisrt fault, obtaining for the second detection time for obtaining the 3rd fault current detection device.
3rd judging unit, for judging the size of the first detection time and the second detection time.
5th determining unit, for when judging that the first detection time was greater than for the second detection time, determines the fault point of power circuit side away from the second fault current detection device in the both sides of the 3rd fault current detection device.
6th determining unit, for when judging that the first detection time was less than for the second detection time, determines that the fault point of power circuit is between Fisrt fault current sensing means and the point of crossing of multiple branch road.
Determine the fault point of power circuit between Fisrt fault current sensing means and the point of crossing of multiple branch road (as Fig. 3 a), or be in the both sides of the 3rd fault current detection device away from after the side (as Fig. 3 b) of the second fault current detection device, judge the size of the first detection time and the second detection time, if judge that the first detection time was greater than for the second detection time, then determine the fault point of power circuit side away from the second fault current detection device in the both sides of the 3rd fault current detection device.If judge that the first detection time was less than for the second detection time, then determine that the fault point of power circuit is between Fisrt fault current sensing means and the point of crossing of multiple branch road.
After getting the first detection time and the second detection time, if the first detection time was greater than for the second detection time, so, the distance that fault traveling wave is transmitted to Fisrt fault pick-up unit is greater than the distance being transmitted to the 3rd failure detector, namely distance the 3rd failure detector in trouble spot is nearer, again due to determine the fault point of power circuit in the both sides of the 3rd fault current detection device away from the second fault current detection device side (as Fig. 3 a), or between the point of crossing being in Fisrt fault current sensing means and multiple branch road (as Fig. 3 b), so determine that now fault point is in the section 1 shown in Fig. 3 a, in like manner, when being less than for the second detection time the first detection time, fault point is in the section 4 shown in figure b.
Can also be obtained by formula (1) ~ (4): this electric line fault location device also comprises:
7th acquiring unit, for after determining that the fault point of power circuit is between Fisrt fault current sensing means and the 3rd fault current detection device, obtains the time that Fisrt fault current sensing means detects the capable ripple of Fisrt fault, obtained for the first detection time.
8th acquiring unit, detecting the time of the capable ripple of Fisrt fault, obtaining for the second detection time for obtaining the 3rd fault current detection device.
4th judging unit, for judging the size of the first detection time and the second detection time.
7th determining unit, for when judging that the first detection time was less than for the second detection time, determines that the fault point of power circuit is between Fisrt fault current sensing means and the second fault current detection device.
8th determining unit, for when judging that the first detection time was greater than for the second detection time, determines that the fault point of power circuit is between the second fault current detection device and the 3rd fault current detection device.
Between Fisrt fault current sensing means and the second fault current detection device (as Fig. 3 d), or to be between the second fault current detection device and the 3rd fault current detection device after (as Fig. 3 c), judge the size of the first detection time and the second detection time, if judge that the first detection time was less than for the second detection time, then determine that the fault point of power circuit is between Fisrt fault current sensing means and the second fault current detection device.If judge that the first detection time was greater than for the second detection time, then determine that the fault point of power circuit is between the second fault current detection device and the 3rd fault current detection device.
After getting the first detection time and the second detection time, if the first detection time was greater than for the second detection time, so, the distance that fault traveling wave is transmitted to Fisrt fault pick-up unit is greater than the distance being transmitted to the 3rd failure detector, namely distance the 3rd failure detector in trouble spot is nearer, again owing to determining the fault point of power circuit (as Fig. 3 d) between Fisrt fault current sensing means and the second fault current detection device, or between the second fault current detection device and the 3rd fault current detection device (as Fig. 3 c), so determine that now fault point is in the section 2 shown in Fig. 3 c, in like manner, when being less than for the second detection time the first detection time, fault point is in the section 3 shown in Fig. 3 d.
In the above-described embodiments, during time of fault current detection device detection failure row ripple, the wave head of preferred detection fault traveling wave is as the time of the fault traveling wave detected.
Further, Fisrt fault current sensing means and the 3rd fault current detection device are symmetrical arranged relative to the second fault current detection device, and electric line fault location device also comprises:
9th acquiring unit, for obtaining the length of the first branch road.
Tenth acquiring unit, for obtain Fisrt fault current sensing means and multiple branch road point of crossing between distance.
First computing unit, for the length according to the first branch road with apart from the velocity of wave calculating fault traveling wave.And
Second computing unit, for according to the distance between the trouble spot of velocity of wave computing electric line and the end of the branch road at place, trouble spot.
After judging according to above-described embodiment the concrete section that fault occurs, the range equation of respective section can be listed.If fault traveling wave velocity of propagation is v, when fault occurs in section 2 or section 3, can according to Δ t a1with Δ t c1first calculate the size of traveling wave speed, can be expressed as:
Then Δ t in formula (2) is utilized b1calculate the distance that fault occurs.Below provide the total range equation under different section failure condition:
X = ( &Delta;t A 1 + &Delta;t B 1 + &Delta;t C 1 ) v 6 ( X < Y ) 2 &Delta;t B 1 &Delta;t A 1 + &Delta;t C 1 Y ( Y < X &le; L / 2 ) L - 2 &Delta;t B 1 &Delta;t A 1 + &Delta;t C 1 Y ( L / 2 < X &le; L - Y ) L - ( &Delta;t A 1 + &Delta;t B 1 + &Delta;t C 1 ) v 6 ( L - Y < X ) - - - ( 6 )
The embodiment of the present invention, by distributed installation three groups of fault current detection devices on multiple branch roads of power circuit, detects the time order and function failure judgement branch of fault traveling wave by the Fisrt fault current sensing means of close multiple branch road point of crossing; The mistiming of adjacent two fault traveling waves then utilizing on fault branch three fault current detection devices to detect accurately locates the trouble spot of breaking down.By the embodiment of the present invention, accurately can locate the trouble spot on power circuit, line parameter circuit value and the catadioptric impact of fault traveling wave can not be subject to, thus improve the accuracy of localization of fault.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (11)

1. a feeder line fault localization method, described power circuit comprises multiple branch road, it is characterized in that, described feeder line fault localization method comprises:
Obtain the time that described multiple branch road detects fault traveling wave;
Judge described multiple branch road to detect whether the time of described fault traveling wave is identical;
If judge that the time of the described fault traveling wave that described multiple branch road detects is identical, then the fault point of described power circuit is in the region at the place, point of crossing of described multiple branch road; And
If judge that the time of the described fault traveling wave that described multiple branch road detects is different, then the branch road of fault point in earliest detection to described fault traveling wave of described power circuit,
Wherein, the device described multiple branch road detecting described fault traveling wave is all identical with the distance of described point of crossing.
2. feeder line fault localization method according to claim 1, it is characterized in that, each branch road in described multiple branch road is respectively arranged with fault current detection device, each branch road described is all disposed with Fisrt fault current sensing means, the second fault current detection device and the 3rd fault current detection device from the point of crossing of described multiple branch road, and described feeder line fault localization method also comprises:
Obtain the mistiming that described Fisrt fault current sensing means detects the capable ripple of Fisrt fault and the second fault traveling wave, obtain the very first time poor, wherein, the capable ripple of described Fisrt fault and described second fault traveling wave are adjacent fault traveling wave;
Obtain the mistiming that described second fault current detection device detects the capable ripple of described Fisrt fault and described second fault traveling wave, obtained for the second mistiming;
Obtain the mistiming that described 3rd fault current detection device detects the capable ripple of described Fisrt fault and described second fault traveling wave, obtained for the 3rd mistiming;
Judge that whether the described very first time poor, described second mistiming is equal with described 3rd mistiming;
If judge the described very first time poor, described second mistiming and described 3rd mistiming unequal, then determine that the fault point of described power circuit is between described Fisrt fault current sensing means and described 3rd fault current detection device; And
If judge that the described very first time poor, described second mistiming is equal with described 3rd mistiming, then determine that the fault point of described power circuit is between described Fisrt fault current sensing means and the point of crossing of described multiple branch road, or be in the side away from described second fault current detection device in the both sides of described 3rd fault current detection device
Wherein, described Fisrt fault current sensing means on each branch road described is equal apart from the distance of described point of crossing, second fault current detection device is arranged on the mid point of described branch road, and described Fisrt fault current sensing means and described 3rd fault current detection device are symmetrical arranged relative to described second fault current detection device.
3. feeder line fault localization method according to claim 2, it is characterized in that, determining that the fault point of described power circuit is between described Fisrt fault current sensing means and the point of crossing of described multiple branch road, be in away from after the side of described second fault current detection device in the both sides of described 3rd fault current detection device, described feeder line fault localization method comprises:
Obtain the time that described Fisrt fault current sensing means detects the capable ripple of described Fisrt fault, obtained for the first detection time;
Obtain the time that described 3rd fault current detection device detects the capable ripple of described Fisrt fault, obtained for the second detection time;
Judge the size of described first detection time and described second detection time;
If judge that described first detection time is greater than described second detection time, then determine the fault point of described power circuit side away from described second fault current detection device in the both sides of described 3rd fault current detection device; And
If judge that described first detection time is less than described second detection time, then determine that the fault point of described power circuit is between described Fisrt fault current sensing means and the point of crossing of described multiple branch road.
4. feeder line fault localization method according to claim 2, it is characterized in that, after determining that the fault point of described power circuit is between described Fisrt fault current sensing means and described 3rd fault current detection device, described feeder line fault localization method comprises:
Obtain the time that described Fisrt fault current sensing means detects the capable ripple of described Fisrt fault, obtained for the first detection time;
Obtain the time that described 3rd fault current detection device detects the capable ripple of described Fisrt fault, obtained for the second detection time;
Judge the size of described first detection time and described second detection time;
If judge that described first detection time is less than described second detection time, then determine that the fault point of described power circuit is between described Fisrt fault current sensing means and described second fault current detection device; And
If judge that described first detection time is greater than described second detection time, then determine that the fault point of described power circuit is between described second fault current detection device and described 3rd fault current detection device.
5. feeder line fault localization method according to claim 2, it is characterized in that, described Fisrt fault current sensing means and described 3rd fault current detection device are symmetrical arranged relative to described second fault current detection device, described multiple branch road comprises the first branch road, and described feeder line fault localization method also comprises:
Obtain the length of described first branch road;
Distance between the point of crossing obtaining described Fisrt fault current sensing means and described multiple branch road;
According to the length of described first branch road and the velocity of wave of the described fault traveling wave of described distance calculating; And
Distance between the end calculating the trouble spot of described power circuit and the branch road at place, described trouble spot according to described velocity of wave.
6. an electric line fault location device, is characterized in that, described power circuit comprises multiple branch road, it is characterized in that, described electric line fault location device comprises:
First acquiring unit, detects the time of fault traveling wave for obtaining described multiple branch road;
First judging unit, for judging described multiple branch road to detect whether the time of described fault traveling wave is identical;
First determining unit, for when judging that the time of the described fault traveling wave that described multiple branch road detects is identical, determines that the fault point of described power circuit is in the region at the place, point of crossing of described multiple branch road; And
Second determining unit, for when judging that the time of the described fault traveling wave that described multiple branch road detects is different, determines the branch road of the fault point of described power circuit in earliest detection to described fault traveling wave,
Wherein, the device described multiple branch road detecting described fault traveling wave is all identical with the distance of described point of crossing.
7. electric line fault location device according to claim 6, it is characterized in that, each branch road in described multiple branch road is respectively arranged with fault current detection device, each branch road described is all disposed with Fisrt fault current sensing means, the second fault current detection device and the 3rd fault current detection device from the point of crossing of described multiple branch road, and described electric line fault location device also comprises:
Second acquisition unit, detect the mistiming of the capable ripple of Fisrt fault and the second fault traveling wave for obtaining described Fisrt fault current sensing means, obtain the very first time poor, wherein, the capable ripple of described Fisrt fault and described second fault traveling wave are adjacent fault traveling wave;
3rd acquiring unit, detecting the mistiming of the capable ripple of described Fisrt fault and described second fault traveling wave, obtaining for the second mistiming for obtaining described second fault current detection device;
4th acquiring unit, detecting the mistiming of the capable ripple of described Fisrt fault and described second fault traveling wave, obtaining for the 3rd mistiming for obtaining described 3rd fault current detection device;
Second judging unit, for judging that whether the described very first time poor, described second mistiming is equal with described 3rd mistiming;
3rd determining unit, for when judging the described very first time poor, described second mistiming and described 3rd mistiming is unequal, determine that the fault point of described power circuit is between described Fisrt fault current sensing means and described 3rd fault current detection device; And
4th determining unit, for when judging that the described very first time poor, described second mistiming is equal with described 3rd mistiming, determine that the fault point of described power circuit is between described Fisrt fault current sensing means and the point of crossing of described multiple branch road, or be in the side away from described second fault current detection device in the both sides of described 3rd fault current detection device
Wherein, described Fisrt fault current sensing means on each branch road described is equal apart from the distance of described point of crossing, described second fault current detection device is arranged on the mid point of described branch road, and described Fisrt fault current sensing means and described 3rd fault current detection device are symmetrical arranged relative to described second fault current detection device.
8. electric line fault location device according to claim 7, is characterized in that, described electric line fault location device also comprises:
5th acquiring unit, for determining that the fault point of described power circuit is between described Fisrt fault current sensing means and the point of crossing of described multiple branch road, be in the both sides of described 3rd fault current detection device away from after the side of described second fault current detection device, obtain the time that described Fisrt fault current sensing means detects the capable ripple of described Fisrt fault, obtained for the first detection time;
6th acquiring unit, detecting the time of the capable ripple of described Fisrt fault, obtaining for the second detection time for obtaining described 3rd fault current detection device;
3rd judging unit, for judging the size of described first detection time and described second detection time;
5th determining unit, for when judging that described first detection time is greater than described second detection time, determine the fault point of described power circuit side away from described second fault current detection device in the both sides of described 3rd fault current detection device; And
6th determining unit, for when judging that described first detection time is less than described second detection time, determines that the fault point of described power circuit is between described Fisrt fault current sensing means and the point of crossing of described multiple branch road.
9. electric line fault location device according to claim 7, is characterized in that, described electric line fault location device also comprises:
7th acquiring unit, for after determining that the fault point of described power circuit is between described Fisrt fault current sensing means and described 3rd fault current detection device, obtain the time that described Fisrt fault current sensing means detects the capable ripple of described Fisrt fault, obtained for the first detection time;
8th acquiring unit, detecting the time of the capable ripple of described Fisrt fault, obtaining for the second detection time for obtaining described 3rd fault current detection device;
4th judging unit, for judging the size of described first detection time and described second detection time;
7th determining unit, for when judging that described first detection time is less than described second detection time, determines that the fault point of described power circuit is between described Fisrt fault current sensing means and described second fault current detection device; And
8th determining unit, for when judging that described first detection time is greater than described second detection time, determines that the fault point of described power circuit is between described second fault current detection device and described 3rd fault current detection device.
10. electric line fault location device according to claim 7, it is characterized in that, described Fisrt fault current sensing means and described 3rd fault current detection device are symmetrical arranged relative to described second fault current detection device, described multiple branch road comprises the first branch road, and described electric line fault location device also comprises:
9th acquiring unit, for obtaining the length of described first branch road;
Tenth acquiring unit, for obtain described Fisrt fault current sensing means and described multiple branch road point of crossing between distance;
First computing unit, for calculating the velocity of wave of described fault traveling wave according to the length of described first branch road and described distance; And
Second computing unit, for the branch road of the trouble spot and place, described trouble spot that calculate described power circuit according to described velocity of wave end between distance.
11. 1 kinds of fault positioning system of power lines, is characterized in that, comprising:
Fault current detection device, being arranged on described power circuit, the time of fault traveling wave being detected for obtaining multiple branch road, concurrent censorship measures the time of described fault traveling wave; And
Monitoring station, for receiving the time of the described fault traveling wave that described fault current detection device detects, judges described multiple branch road to detect whether the time of described fault traveling wave is identical; If judge that the time of the described fault traveling wave that described multiple branch road detects is identical, then the fault point of described power circuit is in the region at the place, point of crossing of described multiple branch road; And if judge that the time of the described fault traveling wave that described multiple branch road detects is different, the then branch road of fault point in earliest detection to described fault traveling wave of described power circuit, wherein, the device described multiple branch road detecting described fault traveling wave is all identical with the distance of described point of crossing.
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