CN102967804A - T-link fault distance measurement method based on D type traveling wave principle - Google Patents

Abstract

The invention provides a T-link fault distance measurement method based on D type traveling wave principle. The T-link fault distance measurement method comprises the following steps in sequence: selecting any one of three measuring points at three ends of the T link as the reference; carrying out fault distance measurement twice by virtue of the reference measuring point and the rest two measuring points according to the D type traveling wave distance measurement principle; and finally selecting the larger value from the two fault distance measurement results as the final distance measurement result of the fault point, thus realizing the T-link traveling wave fault distance measurement. The T-link fault distance measurement method based on D type traveling wave principle has the advantages that the fault distance measurement result is directly obtained based on the absolute time of the initial traveling wave of the fault traveling to the three ends of the T link and the length of the route, and the fault branch is not needed to be determined; the calculation is simple and carried out by the same method; the defect that conventional algorithm brings dead fault distance measurement areas in the node of the T link can be overcome; and the accuracy and reliability of the traveling wave fault distance measurement in the T link can be improved.

Description

T link fault distance-finding method based on the capable ripple principle of D type

Technical field

The invention belongs to the protecting electrical power system technical field, particularly a kind of T link fault distance-finding method based on the capable ripple principle of D type.

Background technology

Determine quickly and accurately the position of failure point of power circuit, can accelerate the reparation of permanent fault, in time remove a hidden danger to avoid the again generation of a large amount of transient faults, safety and stability and the economical operation that guarantees electric system is of great significance.

At present, the transmission line malfunction location has proposed several different methods both at home and abroad, mainly is divided into impedance method and traveling wave method two large classes by its principle.Impedance method is subjected to that line construction is asymmetric, transition resistance, line parameter circuit value be along the impact of the factors such as corridor skewness and mutual inductor mapping fault, and range error is larger.Traveling wave method is not subjected to the impact of above-mentioned factor substantially, obtains a wide range of applications in the AC and DC overhead transmission line of 220kV and above.

The Travelling Wave Fault Location principle can be divided into single-ended principle and both-end principle.Single-ended principle utilizes the mistiming between reflection wave and the incident wave to calculate fault distance.Yet in T link fault, when fault occurred in the different section of T link, the catadioptric process of fault traveling wave was different.Therefore, the reflected traveling wave of how distinguishing from trouble spot and which bar opposite end bus becomes a difficult problem.The single-ended traveling wave fault positioning principle also is difficult to automatically provide correct range finding result at present, still can not use separately in transmission line of electricity.The both-end principle is the mistiming that arrives the circuit two ends by calculating fault traveling wave to calculate abort situation, and its bearing accuracy is not subjected to the impact of the factors such as the abort situation, fault type, line length, stake resistance of circuit substantially.Theoretical analysis and practical application show, although the capable ripple principle of both-end can provide the localization of fault result automatically when T link fault, but it accurately could be realized after the branch of failure judgement place, the impact that causes its reliability and accuracy judged by fault branch.Particularly when fault occurred near the contact of T link, fault branch is judged will produce very large error, caused existing near the T contact range finding dead band.

Summary of the invention

The object of the present invention is to provide a kind of T link fault distance-finding method based on the capable ripple principle of D type that can overcome defects, be applicable to the T link.Its technical scheme is for adopting following steps:

(1) selects the reference measure point: represent T link three ends with M, N, P; Measurement point 1, measurement point 2, measurement point 3 lay respectively at M end, N end and the P end of T link, and the branch line length at its place is followed successively by l ₁, l ₂, l ₃Choose measurement point 1 and be the reference measure point;

(2) preliminary fault localization: suppose that k is the trouble spot, time T ₁, time T ₂, time T ₃For in the situation of clock Complete Synchronization, fault initial row wave is rushed to the time that reaches measurement point 1, measurement point 2, measurement point 3; The speed that v propagates in the line for the row ripple; Utilize the trouble spot of measurement point 2 and measurement point 1 place routine calculation to be l to reference measure point distance _K12, utilize the trouble spot of measurement point 3 and measurement point 1 place routine calculation to be l to reference measure point distance _K13Can obtain respectively according to D type travelling wave ranging principle: ${\mathrm{<figure-callout\; id="12"\; label="l\; k"\; filenames="HDA00002583485500011.png"\; state="\{\{state\}\}">l</figure-callout>}}_k=\frac{l_1+l_2+v(T_1+T_2)}{2},$ $l_{k13}=\frac{l_1+l_3+v(T_1-T_3)}{2};$

(3) final fault localization results verification: establishing trouble spot k is l to the final range finding result of reference measure point _1kIf l _K12〉=l _K13, l then _1k=l _K12If l _K12＜l _K13, l then _1k=l _K13

Principle of work is: according to the failed row wave trajectory as can be known, be positioned at first fault traveling wave that T link M holds, N holds, the measurement point of P end receives and should be fault initial row ripple.For the T link, its fault may occur on the circuit MN, also may occur on the circuit MP.After fault occurs, based on D type travelling wave ranging principle, utilize mistiming of the fault initial row ripple due in that measurement point 1 and measurement point 2 receive on the MN circuit can calculate the trouble spot to measurement point 1 apart from l _K12, utilize equally mistiming of the fault initial row ripple due in that measurement point 1 and measurement point 3 receive on the MP circuit can calculate the trouble spot to measurement point 1 apart from l _K13If fault occurs in T link MO branch road, l is arranged obviously _K12=l _K13If fault occurs in T link NO branch road, l is arranged obviously _K12＞l _K13If fault occurs in T link PO branch road, l is arranged obviously _K12＜l _K13To sum up can draw, final fault localization result is these two results' that may find range higher value.

The present invention compared with prior art, its advantage is: based on D type travelling wave ranging principle, absolute time and the length of circuit own of directly utilizing fault initial row ripple to arrive T link three ends obtain the fault localization result, the method need not failure judgement branch, not only calculate simple, used computing method are consistent, and overcome the defective of traditional algorithm to fault localization dead band, T link contact place, and then improved accuracy and the reliability of localization of fault.After the T link breaks down, need not the expensive time to get final product the localization of faults, improved power supply reliability, have a extensive future.

Description of drawings

Fig. 1 is fault transient travelling wave communication process synoptic diagram of the present invention.

Among the figure: M, N, P represent T link three ends, also are measurement point 1, measurement point 2, measurement point 3 corresponding positions, and the branch line length at measurement point 1, measurement point 2, measurement point 3 places is followed successively by l ₁, l ₂, l ₃K is the trouble spot; Time T ₁, T ₂, T ₃For in the situation of clock Complete Synchronization, fault initial row wave is rushed to the time that reaches measurement point 1, measurement point 2, measurement point 3.

Embodiment

The present invention is made the following instructions with certain simulation example below in conjunction with accompanying drawing:

Embodiment 1: electric pressure is 110kV, and M, N, P represent T link three ends; Measurement point 1, measurement point 2, measurement point 3 lay respectively at M, N, P three ends of T link, and the branch line length at its place is followed successively by l ₁=150km, l ₂=200km, l ₃=120km; Time T ₁, T ₂, T ₃Be respectively in the situation of clock Complete Synchronization, fault initial row wave is rushed to the absolute time that reaches measurement point 1, measurement point 2, measurement point 3; Actual fault point k is positioned at T link NO segment distance 1 measurement point 210km, in the line velocity of propagation v=2.928 of row ripple * 10 ⁵Km/s.T=0s breaks down constantly.

Step 1, selection reference measure point: represent T link three ends with M, N, P; Measurement point 1, measurement point 2, measurement point 3 lay respectively at M, N, P three ends of T link, and the branch line length at its place is followed successively by l ₁, l ₂, l ₃Choose measurement point 1 and be the reference measure point;

Step 2, preliminary fault localization: in the situation of clock Complete Synchronization, fault initial row wave is rushed to the absolute time that reaches measurement point 1, measurement point 2, measurement point 3 and is respectively T ₁=720 μ s, T ₂=891 μ s, T ₃=208 μ s; Based on D type travelling wave ranging principle, utilize the trouble spot of measurement point 2 and measurement point 1 place routine calculation to arrive reference measure point apart from l ₁₂For:

Based on D type travelling wave ranging principle, utilize the trouble spot of measurement point 3 and measurement point 1 place routine calculation to arrive reference measure point apart from l ₁₃For: $l_{k13}=\frac{l_1+l_3+v(T_1-T_3)}{2}=209.957\mathrm{km};$

Step 3, final fault localization results verification: because l _K12＜l _K13, then final fault localization result is: trouble spot k to measurement point 1 apart from l _1k=l _K13=209.957km; Compare with actual fault point, measuring error of the present invention is 43m.

Embodiment 2: electric pressure is 110kV, and M, N, P represent T link three ends; Measurement point 1, measurement point 2, measurement point 3 lay respectively at M, N, P three ends of T link, and the branch line length at its place is followed successively by l ₁=150km, l ₂=200km, l ₃=120km; Time T ₁, T ₂, T ₃Be respectively in the situation of clock Complete Synchronization, fault initial row wave is rushed to the absolute time that reaches measurement point 1, measurement point 2, measurement point 3; Actual fault point k is positioned at T link contact O, in the line velocity of propagation v=2.928 of row ripple * 10 ⁵Km/s.T=0s breaks down constantly.

Step 1, selection reference measure point: represent T link three ends with M, N, P; Measurement point 1, measurement point 2, measurement point 3 lay respectively at M, N, P three ends of T link, and the branch line length at its place is followed successively by l ₁, l ₂, l ₃Choose measurement point 1 and be the reference measure point;

Step 2, preliminary fault localization: in the situation of clock Complete Synchronization, fault initial row wave is rushed to the absolute time that reaches measurement point 1, measurement point 2, measurement point 3 and is respectively T ₁=515 μ s, T ₂=686 μ s, T ₃=412 μ s; Based on D type travelling wave ranging principle, utilize the trouble spot of measurement point 2 and measurement point 1 place routine calculation to arrive reference measure point apart from l ₁₂For:

Based on D type travelling wave ranging principle, utilize the trouble spot of measurement point 3 and measurement point 1 place routine calculation to arrive reference measure point apart from l ₁₃For: $l_{k13}=\frac{l_1+l_3+v(T_1-T_3)}{2}=150.079\mathrm{km};$

Step 3, final fault localization results verification: because l _K12＜l _K13, then final fault localization result is: trouble spot k to measurement point 1 apart from l _1k=l _K13=150.079km; Compare with actual fault point, measuring error of the present invention is 79m.

Claims (1)

1. T link fault distance-finding method based on the capable ripple principle of D type is characterized in that adopting following steps:

(1) selects the reference measure point: represent T link three ends with M, N, P; Measurement point 1, measurement point 2, measurement point 3 lay respectively at M end, N end and the P end of T link, and the branch line length at its place is followed successively by l ₁, l ₂, l ₃Choose measurement point 1 and be the reference measure point;

(2) preliminary fault localization: suppose that k is the trouble spot, time T ₁, time T ₂, time T ₃For in the situation of clock Complete Synchronization, fault initial row wave is rushed to the time that reaches measurement point 1, measurement point 2, measurement point 3; The speed that v propagates in the line for the row ripple; Utilize the trouble spot of measurement point 2 and measurement point 1 place routine calculation to be l to reference measure point distance _K12, utilize the trouble spot of measurement point 3 and measurement point 1 place routine calculation to be l to reference measure point distance _K13Can obtain respectively according to D type travelling wave ranging principle: $l_{k12}=\frac{l_1+l_2+v(T_1+T_2)}{2},$ $l_{k13}=\frac{l_1+l_3+v(T_1-T_3)}{2};$

(3) final fault localization results verification: establishing trouble spot k is l to the final range finding result of reference measure point _1kIf l _K12〉=l _K13, l then _1k=l _K12If l _K12＜l _K13, l then _1k=l _K13

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