A Method for Realizing Ground Fault Inversion of Distribution Automation Test System

Abstract

The invention discloses a ground fault inversion implementation method for a distribution automation test system. The method comprises the following steps: reading a ground fault simulation waveform file; converting the sampling frequency in the waveform file into a proper sampling frequency through an interpolation algorithm; scaling the sampling values of the corresponding channels; acquiring asampling point from the first cycle of the initial steady state of the waveform file, and calculating the amplitude and the initial phase angle of the initial steady state of the waveform through an FFT algorithm to construct a compensation steady state before a fault waveform fault point; obtaining a sampling point from the last cycle of the last steady state of the waveform file, and calculatingthe amplitude and the initial phase angle of the last steady state of the waveform file through the FFT algorithm to obtain the compensation steady state after the fault point is constructed; and thesystem combines the pre-fault compensation steady state, the post-fault compensation steady state and the ground fault waveform after sampling frequency conversion into a ground fault inversion statesequence. The technical problems of low test efficiency, poor flexibility and the like are solved.

Description

technical field [0001] The invention belongs to the field of distribution network automation, in particular to a method for implementing ground fault inversion of a distribution automation test system. Background technique [0002] With the improvement of the reliability level of the distribution network and the rapid development of distribution automation, in order to quickly check the ground fault, the distribution line fault indicator has been widely used in the distribution network. Whether it can quickly and correctly identify the line ground fault has become a The main important factors affecting the reliable operation of distribution network. Therefore, major power companies regard the ground fault identification function of the fault indicator as an important test index for equipment network detection. [0003] At present, my country's distribution network generally uses two types of neutral point grounding methods, namely, high-current grounding and low-current gro...

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a ground fault inversion implementation method for distribution automation test system to solve the problem that most of the current test systems use the inversion waveform of the steady state and simulated ground fault before the fault occurs. Realization, this will greatly increase the data volume of the waveform file, increase the time for the test system to send waveform data to the power source module, and reduce the test efficiency; at the same time, if the test parameters change, it is necessary to re-simulate and generate the waveform file of the entire state , poor flexibility and other technical issues

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