On-line distance measurement method of protection fault information management system
A technology of management system and distance measurement method, which is applied to fault location, fault detection according to conductor type, etc., can solve the problem of low timeliness of fault recording data, and achieve the effect of improving timeliness
Active Publication Date: 2017-10-20
ZHONGSHAN POWER SUPPLY BUREAU OF GUANGDONG POWER GRID
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The present invention relates to an on-line distance measurement method of a protection fault information management system. The method comprises the following steps that: S1, after a power grid malfunctions, a fault line is judged according to remote signaling shift, SOE and protection action signals; S2, the recording file of a specified fault recorder of a two-side plant station to which the fault line belongs is called; S3, a specific fault time point and a corresponding failure device are determined according to the phase current sudden change quantity of the recording file, and eight analog quantity channels, namely three-phase voltages, a zero-sequence voltage, three-phase current and zero-sequence current of the failure device are further determined; S4, as for disperse sampling points of a cyclic wave before the fault and a cyclic wave after the fault, the complex values of the three-phase voltages, the zero-sequence voltage, three-phase current and zero-sequence current before and after fault are calculated through using a differential Fourier series algorithm according to the fault time point and the eight analog quantity channels; S5, positive-sequence, negative-sequence and zero-sequence current values after the fault are calculated through phase sequence conversion, and a fault phase is determined through the comparative analysis of sequence current fault components; and S6, after the fault phase is determined, distance measurement calculation at a single end side or two end sides is performed.
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