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Failure direction determination process for electric system AC electricity transmission line

A technology for transmission lines and fault directions, applied in emergency protection circuit devices, electrical components, etc., to achieve the effect of accurate direction and high sensitivity

Active Publication Date: 2012-04-18
DONGFANG ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to provide a method for judging the fault direction of an AC transmission line in a power system to overcome the defects of the existing methods for judging the fault direction of electric lines

Method used

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  • Failure direction determination process for electric system AC electricity transmission line
  • Failure direction determination process for electric system AC electricity transmission line
  • Failure direction determination process for electric system AC electricity transmission line

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0021] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0022] refer to figure 1 , there is a protective device on the m side. The protection device of the line has the function of data processing, which can sample the three-phase voltage and current of this side, and control the actuator of this side. The protection device samples the three-phase voltage and current on the local side, calculates the positive sequence reactance of the fault component, and then performs direction discrimination.

[0023] figure 2 , image 3 The network diagrams of the positive sequence fault components when the forward and reverse faults occur are respectively, and the line powered by the double-sided power supply has a fault at point F. In the figure, Z sm ,Z sn are the positive-sequence source impedances on both sides of the line, Z L1 is the positive sequence line impedance, is the positive sequence fault component pot...

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Abstract

The invention discloses an electric power system alternating current transmission line fault direction judgment method, which belongs to the field of relay protection of the electric power system. The method comprises the following steps: a protection device is arranged at one side of a protected line section, a positive-sequence fault-component voltage phasor deltaU1 and a positive sequence fault-component current phasor deltaI1 at the side are calculated, then a fault-component positive-sequence impedance deltaU1 / deltaI1 is calculated out, the imaginary part is taken, i.e. the fault-component positive-sequence reactance, X1 is equal to Im (deltaU1 / deltaI1), and the fault direction is judged according to the size relationship between the fault-component positive-sequence reactance value and the fixed value.

Description

(1) Technical field [0001] The invention relates to a method for judging the direction of a fault in the field of relay protection of a power system, in particular to a method for judging the direction of a fault when an AC transmission line of the power system fails. (two), background technology [0002] Directional elements play an important role in modern relay protection devices, and are widely used in directional overcurrent protection, distance protection and longitudinal directional line protection. The fault component positive sequence directional element uses the angle between the fault component positive sequence voltage and the fault component positive sequence current to judge the fault direction. It can be fully applied to various types of faults and is the first choice for the directional element. However, the defect of this method is that for some faults in some systems, the positive sequence current of the fault component measured by the protection device is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26
Inventor 刘凯李小滨唐永建刘荣
Owner DONGFANG ELECTRONICS
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