A method for fault location in electric power lines

A fault location, power line technology, applied in fault location, information technology support system, etc., can solve problems such as expensive, slow, dangerous, etc.

Inactive Publication Date: 2008-09-10
ABB AS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is slow, expensive, and even dangerous in adverse weather conditions

Method used

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  • A method for fault location in electric power lines
  • A method for fault location in electric power lines
  • A method for fault location in electric power lines

Examples

Experimental program
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Effect test

Embodiment Construction

[0237] Example of an embodiment of the invention for a three-terminal power line

[0238] figure 1 The transmission system shown in includes three generating stations A, B and C. Station A is at the beginning of the line, station B is at the end of the line, and station C is in tap T after the line branching off from the line between stations AB. Tap point T divides the transmission system into three sections LA, LB and LC. In station A there is a fault locator FL. Using fault models and fault circuits for symmetrical components as well as for different types of faults, is defined by applying a F1 , a F2 , a F0 Appropriate share coefficients and weight coefficients for a 1 , a 2 with a 0 For fault location, the share factor determines the relationship between the symmetrical components of the total fault current when estimating the voltage drop across the fault resistance, and the weight factor defines the share of each component in the total model of the fault cir...

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PUM

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Abstract

A method for locating faults in three-terminal and multi-terminal power lines, applicable in electric power systems for overhead and underground cable transmission and distribution lines. The inventive method is characterised in that it measures current for fault and pre-fault conditions and in one terminal station of the system line phase voltage for fault and pre-fault conditions is measured, a hypothetical fault location is assumed, the distances to the hypothetical fault locations are calculated and fault resistance is calculated, the actual fault point is selected by first comparing the numerical values concerning the distances to the hypothetical fault locations and rejecting those results whose numerical values are negative or bigger than one in relative units,; and then by analysing the values of the calculated fault resistances for the fault locations and rejecting those results of the calculations for which the value of fault resistance is negative, and if there is still more than one calculation result remains not rejected then performing selection of the valid result by analysing the values of the calculated respective equivalent source impedances.

Description

technical field [0001] The present invention relates to a method for fault location in power lines suitable for three-terminal power lines and multi-terminal power lines, suitable for use in the power industry for overhead and overhead cable transmission or distribution lines. Background technique [0002] Accurate location of faults in power lines is important both to the power company dealing with the distribution of electrical energy and to the end users of the electrical energy. Fast and accurate localization of fault points affects the quality of the transmitted electrical energy and the reliable and continuous supply of electrical energy. In most cases, faults result in mechanical damage that must be removed before voltage can be restored in the line. If the exact location of the fault is known, the fault can be corrected quickly. The easiest method for determining the location of a fault is to search along the line. This method is slow, expensive, and even dangerou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCY04S10/522
Inventor P・巴尔塞雷克M・富尔齐克E・罗索洛夫斯基J・伊齐科夫斯基M・萨哈
Owner ABB AS
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