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Cable-aerial mixed line fault travelling wave ranging method

A technology of mixing lines and fault traveling waves, which is applied in the direction of fault locations, emergency protection circuit devices, electrical components, etc., can solve the problems of not considering the influence of line zero-mode component coupling and the difficulty of realizing the synchronization of pulse emission devices, etc.

Inactive Publication Date: 2008-11-05
KUNMING UNIV OF SCI & TECH
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Problems solved by technology

Yu Yuze, Qin Jian and Li Gongxin published "A Review of Fault Location Methods for Cable Overhead Line Mixed Lines", which is aimed at the fault location of 220kV cable-overhead lines. The faulty phase and non-faulty phase traveling wave signals first determine the connection point and fault point position and then go to the method of precise distance measurement, but the pulse transmitter and its synchronization are difficult to achieve in practical applications
Cai Yumei’s "Research on Fault Location Method for 10kV Railway Self-closing Through Lines" aims at the problem of fault location of 10kV railway self-closing through cables-overhead lines. Accurate positioning method, but does not consider the influence of line zero-mode component coupling at the fault point

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  • Cable-aerial mixed line fault travelling wave ranging method
  • Cable-aerial mixed line fault travelling wave ranging method
  • Cable-aerial mixed line fault travelling wave ranging method

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Embodiment 1

[0029] Embodiment 1: the present invention figure 1 The B-type hybrid line shown is taken as an example of analysis and simulation objects, and the specific implementation steps are as follows:

[0030] 1. Fault section location based on distribution parameters

[0031] As a simple two-terminal system, when a fault occurs at any point of the line, the fault network can generally be decomposed into a normal network before the fault and an additional positive, negative, and zero-sequence network after the fault by using the symmetrical component method and the linear superposition principle.

[0032]For three-phase symmetrical faults, there is no negative-sequence and zero-sequence network; for asymmetric non-ground faults, there is no zero-sequence network; When there is a fault, there will be a large negative-sequence and zero-sequence current, so the negative-sequence and zero-sequence network can be introduced into the ranging criterion, while in other ground faults, the ze...

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Abstract

The invention relates to a cable-overhead joint line failure travelling wave range count method, particularly performing the effective fusion based on the failure range count method of the fundamental frequency and the travelling wave aiming at the particularity and the complexity of the cable joint line, belonging to the technical field of the power system relay protection. The invention judges the failure generating places firstly based on the cable-overhead junction derivated through the electric quantity at the two ends of the system attached with the negative sequence net after the failure, then performs the correct range count by the range count method of the single end; on the basis of considering the line zero modulus component couple, through comparing the performance of the current travelling wave line zero modulus component, the performance of each reflected wave is judged, to find out the fault point reflected wave, and then perform the correct range count.

Description

technical field [0001] The present invention relates to a cable-overhead hybrid line fault traveling wave distance measurement method, especially for the particularity and complexity of the power cable line hybrid line, the fault distance measurement method based on power frequency and traveling wave is effectively integrated . It belongs to the technical field of electric power system relay protection. Background technique [0002] The fault location of the transmission line is a long-standing problem in the operation of the power system. Accurate fault location and location can greatly shorten the line inspection time and speed up the restoration of power supply, which is of great significance to the safe and economical operation of the power system. Both theory and practice have proved that the traveling wave method can be well realized on a single overhead transmission line or cable line, and the distance measurement accuracy can also meet the requirements. [0003] Wi...

Claims

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Application Information

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IPC IPC(8): H02H7/26G01R31/08
CPCH02H7/265
Inventor 束洪春孙涛董俊刘可真孙士云唐岚刘志坚孙向飞杨毅常勇单节杉刘永泰
Owner KUNMING UNIV OF SCI & TECH
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