Failure direction determination process for electric system AC electricity transmission line

A technology of transmission line and fault direction, applied in the direction of emergency protection circuit devices, electrical components, etc., to achieve the effect of accurate direction and high sensitivity
CN101478148AActive Publication Date: 2009-07-08DONGFANG ELECTRONICS
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
DONGFANG ELECTRONICS
Publication Date
2009-07-08

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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, the positive-sequence fault-component voltage phasor deltaU1 and the positive sequence fault-component current phasor deltaI1 at the side are calculated, then the 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.
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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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