Current protection control method for vacuum circuit breaker

Abstract

A current protection control method of a vacuum breaker includes the steps of: first sampling a current signal from a current transformer; then judging whether the sampled current signal is an overcurrent / short-circuit signal; if so, taking the sampled current signal as a parameter and calculating the current effective value; if the effective value is more than a setting value, conducting protection action; otherwise, continuing to sample. The steps for judging current signals are as follows: 2.1) first calculating the mutational volume iDelta-n of a group of sampling current signals of a plurality of continuous sampling points at intervals; if the mutational volume iDelta-n is more than a preset setting value iDelta-ns, entering into step 2.2); or if iDelta-n is no more than the preset setting value iDelta-ns, then continually calculating the mutational volume of current signals of next group of the sampling points, with the number of each group of sampling points being the same in the step; and 2.2) calculating the mutational volume iDeltak of each pair of adjacent sampling points in the group of sampling points, if each mutational volume iDeltak is more than the preset setting value iDelta1S, then judging the occurrence of overcurrent / short circuit, and entering step 3).

Description

Technical field The invention belongs to the technical field of power transmission and transformation, and specifically relates to a current protection control method in a vacuum circuit breaker applied to a power distribution network. Background technique With the development of the national economy and the continuous improvement of people’s material and cultural living standards, people’s demand for electricity is also increasing, which promotes the rapid development of power industry, the continuous expansion of power grids, and users’ requirements for power supply quality and reliability. taller and taller. Whether the power distribution system can operate safely, stably and reliably is not only directly related to the unobstructed power consumption of the enterprise, but also related to the normal operation of the power system. Therefore, when a certain line in the distribution network is in an abnormal operation state, the line circuit breaker should be able to cut it of...

AI Technical Summary

Problems solved by technology

However, the design and research of most adaptive protection algorithms have not changed much to the sampling filter algorithm, and generally apply the adaptive algorithm with variable data window, without considering the step size of the algorithm and the rate of change of the mutation amount.

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