The vibration signal of an on-load tap changer (OLTC) consists a series sharp bursts, and its fault feature in certain periods is easily missed. This study considered that preprocessing the OLTC segments could effectively solve aforementioned problem. First, collection discussed, waveform characteristics when was normal action described, selection analyzed. Second, time domain frequency spectru...

This thesis deals with various aspects of coordinated voltage control in electric power systems. It consists of an introduction and six papers. The introduction contains a summary of the thesis and tutorials on voltage control and the search methods that have been applied. The first part deals with the coordination of cascaded tap changers in radial distribution feeders. Poor coordination cause...