小波变换在微机变压器保护中的应用

The application of wavelet transforms to transformer's computerized protections

根据小波分析的算法特点和电力系统的故障特征,探讨了小波变换在微机变压器保护中的应用,并在现有的二次谐波原理的变压器微机保护装置的基础上,实现了小波变换原理的变压器差动保护。通过全面的数字仿真和大量的实验充分证明:小波变换用于变压器微机保护是可行的,也是可靠的,并具有其明显的优越性,进而提出可以将小波变换作为信号分析的强有力的新型工具应用到微机变压器保护中,从而建立起新的保护机制。

According to the wavelet transforms characteristic and the features of power system faults, the application of the wavelet transforms to the transformer's computerized protections is presented. Based on the protection devices presently used from the second harmonics principle, the transformer's differential protections using the wavelet transforms principle are achieved. From many digital simulations and tests, it has been shown that the transformer's computerized protections based on the wavelet transforms are feasible and reliable and have obvious advantages. Finally, a technique using the wavelet transformers as a new powerful tool for the transformer's computerized protections is presented, and a new type protection mechanism is developed.