Experimental study of insulation performance of temperature-humidity coupled field coupling decoupling network

Electronic transformer was an important device for the intelligent development of substation, and its insulation performance was highly required due to working in a multi-physical field coupling environment. This study proposed an experimental method for the insulation performance of coupling decoupling network (CDN) under temperature-humidity coupling environment, and designed and developed the corresponding test device and host computer software, and finally tested and verified it with four different insulating materials, namely, acrylic, silica gel, paraformaldehyde and polyurethane. Different temperature and humidity conditions were simulated in the test device, and a DC high-voltage generator was used to conduct voltage withstand tests to measure the voltage withstand capability of different materials in the temperature and humidity coupling field. The results showed that there was a significant difference in the performance of different insulating materials in the temperature and humidity coupling environment. Under the same temperature and humidity conditions, acrylic had a higher voltage resistance.