Most technically oriented people recognize the familiar 60Hz voltage and current traces that constitute the parameters of an operating power system. There are, however, transient components superimposed on the 60Hz waveform in the form of spikes and higher and lower frequencies that accompany faults and other switching events.
These are revealed in the oscillographic records and are an essential element in analyzing power system and equipment performance. A publication ‘Computer Relaying for Power Systems, Research Studies’ by Phadke, A.G. and Thorp, J.S. is available that presents a comprehensive review of the techniques involved in this analysis.
Detailed information on pertinent quantities and events will permit identification of such problems as: