一种基于OCT的变压器保护方案

A Transformer Protection Scheme Based on OCT

提出了一种基于OCT的变压器保护方案,通过对测量的电流进行中值滤波,去除信号的各种干扰,并通过小波Mallat算法提取出信号低频和高频段能量,将二者的比值构成保护动作判据。PSCAD/EMTDC仿真结果表明,该方案在变压器运行各种工况下均能正确工作,需要的数据量较小,性能稳定。。

This paper presents a transformer protection scheme based on OCT. It handles the measuring current by median filter, removes all kinds of interferences, and extracts the energy of the signal at both the low and high frequencies through the wavelet Mallat algorithm. The ratio of the high frequency to the low one constitutes the criterion for protection actions. The results of the PSCAD/EMTDC simulation show the scheme can work correctly under various operating conditions. The algorithm needs less data but the performance is stable.