Abstract
To increase the transmission capacity of 6.6kV distribution lines economically, 11.4kV distribution system that is constructed of existing 6.6kV equipment in use is being examined. For the application of the 11.4kV distribution system to the real field, we are trying to calculate transient over voltage by EMTP to decide the rational test voltage of 11.4kV equipment. So, to confirm the calculation precision of EMTP concerned with transient over voltage in 11.4kV distribution line, we had made an experiment measuring the characteristics of over voltages, which occur in 11.4kV distribution lines. We compared the calculated waveform with the measured waveform, and investigated the difference of the two. About some test data we compared the calculated waveform by EMTP with the measured waveform, and we found that the range of computing errors were from 1.8% to 10.8%.
