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Single-ended fault location method for transmission lines based on sequence component relationship

A transmission line, fault location technology, applied in the direction of the fault location, etc., can solve the problem of increasing the cost of fault location, to avoid the false root problem, to ensure the effect of distance measurement accuracy

Inactive Publication Date: 2019-06-18
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the double-ended method requires the use of double-ended data synchronization, which puts higher requirements on the communication system and increases the cost of fault location.

Method used

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  • Single-ended fault location method for transmission lines based on sequence component relationship
  • Single-ended fault location method for transmission lines based on sequence component relationship
  • Single-ended fault location method for transmission lines based on sequence component relationship

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0028] like image 3 As shown, it is a model of the 230kV AC transmission line in this embodiment, and the total length of the line is 220km. The implementation plan is as follows:

[0029] 1) Use PSCAD to build a model and simulate it.

[0030] 2) Set up four types of faults at 10.0km and 100.0km from point M between MNs. The phase-to-phase transition resistance during the fault is 10Ω, and the grounding resistance is 100Ω.

[0031] Table 1. Fault location results of 230kV AC transmission line model

[0032]

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PUM

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Abstract

The invention relates to a sequence component relation based range finding method for a single-end fault of a power transmission line. A replay protector is used to determine a fault type, the sequence component relation in positive, negative and zero-sequence network is determined according to the fault type, sequence electrical quantities at the measuring end are used to calculate sequence electric quantities at the fault point, and the sequence electric quantities of the fault point are substituted into the sequence component relation to solve a fault distance. The method can be used to overcome the problems that data is asynchronous and false root exists, and maintains high range finding precision.

Description

technical field [0001] The invention relates to a technology in the field of relay protection of electric power systems, in particular to a single-end fault distance measurement method for transmission lines based on sequence component relations. Background technique [0002] High-voltage transmission lines are the lifeblood of the power system. While undertaking important power transmission tasks, they are also a part of the power system that is easily affected by faults. If the transmission line fault cannot be removed in time and the power supply stops, the stable operation of the power system and even the development of the national economy will be seriously affected. [0003] Fault location of transmission lines is an important part of maintaining line stability. The existing common ranging methods include impedance method, traveling wave method and fault analysis method. Compared with the other two methods, the impedance method is easy to operate and has a lower cost...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08
CPCG01R31/08
Inventor 范春菊李笑夫姜军郭煜华张帆
Owner SHANGHAI JIAOTONG UNIV
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