Analog and Digital Simulation of Line-Energizing Overvoltages and Comparison with Measurements in a 400 kV Network

摘要

Results of line-energization tests in the Dutch 400 kV network were used as reference for the development of analog and digital simulation techniques to model complex networks for switching transients. Transient waveforms and overvoltage peak values obtained through duplication of the line energizations by means of a transient network analyzer (TNA) and the ElectroMagnetic Transient Program (EMTP) are compared with field tests. The best resemblance of waveforms is obtained by EMTP while the cumulative distribution of overvoltage peak values from TNA simulation shows the best match with the field measurements. The statistical overvoltages derived from field tests and simulations are all in the range 1.95 pu + or- 5 percent. The results indicate that both EMTP and TNA are suitable to study switching transients in real networks.