On-line distance measurement method of protection fault information management system

Abstract

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.

Description

technical field [0001] The invention relates to the field of high-voltage power transmission, and more specifically, to an online ranging method for a protection fault information management system. Background technique [0002] The high-voltage transmission line is responsible for the transmission of electric energy, and it is also a frequent site of grid faults. Its faults directly threaten the safe operation of modern power systems. Fast and accurate fault location is an important basis for finding transmission line fault points, which can reduce the burden of line patrol personnel, speed up line fault removal, and restore power supply as soon as possible, thereby improving the reliability of power grid operation and reducing economic losses caused by power outages. It is also one of the important measures to technically ensure the safety, stability and economic operation of the power grid. [0003] After the emergence of the new operation and management mode of control ...

AI Technical Summary

Problems solved by technology

[0007] The present invention provides an online ranging method for protecting the fault information management system in order to solve the technical defect that the timeliness of the offline analysis and ranging calculation of the fault recording data in the prior art is not high.

Images