Characteristic analysis of transient electromagnetic disturbance data is very important. In this paper, the time-domain and frequency-domain characteristics of transient electromagnetic disturbance caused by switching operations in substations are analyzed. Two methods are adopted in time-domain analysis. One method is histogram and the other one is normality test. An appropriate procedure for the normality test is proposed. Furthermore, the method used in frequency- domain analysis is to obtain overall envelope. These statistical characteristic analysis methods are showed to be of great value in analyses of the measured samples. The simulation results showed that these methods are effective.
 Wiggins, C.M., Salas, T.M. and Wright, S.E. (1994) Transient Electromagnetic Interference in Substations. IEEE Transaction on Power Delivery, 9, 1869-1881. http://dx.doi.org/10.1109/61.329520
 Wiggins, C.M. and Wright, S.E. (1991) Switching Transient Fields in Subs-tations. IEEE Transaction on Power Delivery, 6, 591-599. http://dx.doi.org/10.1109/61.131116
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