Transient component based short circuit fault phase selection method

Abstract

The invention discloses a transient component based short circuit fault phase selection method comprising the following steps: obtaining the three-phase traveling wave current signals of n detection points preset in case of power line failure wherein n is an integer greater than or equal to one; according to preset determining rules, choosing targeted detection points and extracting the three-phase traveling wave current signals of these targeted detection points; building a phase-model transformation matrix; performing phase-model transformations to the three-phase traveling wave current signals of these targeted detection points for wire model 1, wire model 2 and wire model 3; carrying out wavelet transformation to the wire model 1, wire model 2 and wire model 3 respectively for their limit values; and according to the preset relations between the limit values of the wire model 1, wire model 2 and wire model 3, outputting the result of selection for phase in fault. The method obtains traveling weave fault current when a power transmission line outages. Through corresponding analysis, the phase in fault can be selected so as to identify the characteristics type for short circuits in shorter time but with higher accuracy.

Description

technical field [0001] The invention relates to the field of intelligent diagnosis of power system transmission line faults, in particular to a short-circuit fault phase selection method based on transient components. Background technique [0002] The scale of today's power grid is expanding day by day, and the operating conditions are becoming more and more complex. In particular, high-voltage transmission lines are widely distributed, the terrain is relatively complex, and the climate is also complex and changeable, resulting in frequent failures of transmission lines. Therefore, it is very important and critical to carry out timely and accurate fault diagnosis after the transmission line fails, which directly affects the power supply quality and reliability of the line. [0003] At present, the fault diagnosis of transmission lines is mainly divided into two parts: fault phase selection and fault location. Among them, the requirement of fault phase selection is to quickl...

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Problems solved by technology

At present, the fault phase selection method mainly adopts the phase selection method of sudden fault quantity, fault sequence component phase selection method and fault transient quantity phase selection method. The first two methods are mainly based on power frequency quantity phase selection, and the action speed is very slow and cannot adapt The need for future ultra-high-speed protection

At present, the phase selection method based on the fault transient quantity is mainly based on the analysis of the high-frequency component of the voltage, and there are many difficulties in its accurate extraction.

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