An improved method/setup for extended testing after the Cigre, Method II

The authors describe an improved version of the Cigre Method II test techinque used for testing the resistance of insulating materials to partial discharges (PDs). The method was extended to continuous PD measurements and pulse analyses. It was sound that parameters such as selective fuse protection of the different test objects, and the sample production and preparation, among others, were of the utmost importance for the end results of this test. Results of using the system on epoxy with and without fillers are presented. Based on these results, the critical points of the method are discussed. The application of the system showed typical behavior of the discharges and lifetimes that was strongly dependent on the filler type