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Wave celerity checking method based on measured data

A technology of actual measurement data and calibration, applied in the direction of fault location, etc., can solve the problem of large error in fault distance measurement, achieve the effect of reducing wave velocity error and simple principle

Inactive Publication Date: 2015-05-20
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of excessive fault ranging errors caused by the deviation of wave velocity selection in the traditional traveling wave ranging method, and propose a wave velocity checking method based on measured data

Method used

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  • Wave celerity checking method based on measured data
  • Wave celerity checking method based on measured data
  • Wave celerity checking method based on measured data

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1: At 18:54:53 on September 16, 2014, a phase A transient fault occurred on a line I circuit

[0030] The sampling rate of the traveling wave ranging device installed in the substation is 1MHz, that is, the time required to sample a point is 1μs. figure 2 shown.

[0031] (1) When the line recloses, the initial traveling wave surge generated by the closing of the local end felt at the line measurement end (that is, near the busbar of the substation where the distance measuring device is installed) corresponds to figure 2 In the 439th sampling point; the initial traveling wave will be emitted when it propagates along the line to the opposite busbar (ie: the busbar of the substation without the distance measuring device), so the traveling wave distance measuring device in the substation also records the reflected wave from the opposite busbar arrival time, corresponding to figure 2 In the 819th sampling point.

[0032] (2) According to (1), it can be obtained...

Embodiment 2

[0034] Example 2: At 23:04:18 on March 26, 2013, a phase A transient fault occurred on a line

[0035] The sampling rate of the traveling wave distance measuring device installed in the substation is 1MHz, that is, the time required to sample a point is 1μs. image 3 shown.

[0036] (1) When the line recloses, the initial traveling wave surge generated by the closing of the local end felt at the line measurement end (that is, near the busbar of the substation where the distance measuring device is installed) corresponds to image 3In the 207th sampling point; when the initial traveling wave propagates along the line to the bus at the opposite end (that is, the bus of the substation without a distance measuring device), it will be emitted, so the traveling wave distance measuring device in the substation also records the reflected wave from the opposite bus arrival time, corresponding to image 3 In the 461st sampling point.

[0037] (2) According to (1), it can be obtained ...

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Abstract

The invention provides a wave celerity checking method based on measured data and belongs to the technical field of electric system relay protection. According to the method, as for an electric transmission line NP, only a transformer substation connected with a bus bar P is internally provided with a traveling wave fault location device, when a line 1 has a fault, a reclosing device is started, initial traveling wave surges generated by closing the end are sensed by the measurement end TA1 of the line, are transmitted to a bus bar at an opposite end along the line 1 to be reflected, and then are further transmitted to the measurement end along the line; the current traveling waves of the measurement end TA1 of the line 1 are acquired by virtue of a traveling wave ranging device, the arrival time of closing initial traveling wave heads and reflection wave heads of the bus bar on the opposite end at TA1 are respectively recorded, then the time different delta t is solved out, and finally, the wave celerity is checked by use of the full length of the line 1. Theoretical analysis and measured data analysis indicate that the method is capable of reasonably checking the wave celerity of the line and can be used as reference in actual engineering calculation.

Description

technical field [0001] The invention relates to a wave velocity checking method based on measured data, and belongs to the technical field of electric power system relay protection. Background technique [0002] Transmission lines are distributed in a wide range, and the terrain in the area they pass is complex and the weather conditions are changeable, which can easily lead to transmission line faults. After a line fault, it can quickly and accurately measure the distance, which helps to reduce the burden of line inspection on site operation and maintenance personnel and shorten It plays an important role in ensuring the normal and stable operation of the power system by shortening the fault repair time and reducing the loss of the system power outage. [0003] At present, a large number of traveling wave ranging devices in China have been put into field operation, but in actual lines, due to the influence of factors such as sag, traveling wave attenuation and wave velocity...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
Inventor 束洪春白冰余多曹璞璘董俊
Owner KUNMING UNIV OF SCI & TECH