USING VLF AND PD TESTING TO IMPROVE COMMISSIONING RELIABILITY

摘要

Methods to check medium voltage cable integrity have evolved drastically in the last 30 to 40 years. The DC hipot test has largely been replaced by the 0.1 Hz very-low-frequency (VLF) test, and North American (IEEE) and European (IEC, CE, CIGRE) standards specify the VLF test method for solid dielectric medium-voltage cables. Throughout these years, the 0.1 Hz VLF test has proven to be a reliable test method to perform acceptance and preventive maintenance testing of medium-voltage cables. Like any proof test method, it is a go/no-go test and has limited diagnostic capabilities. However, the scope of the 0.1 Hz VLF proof test method can be greatly expanded into a predictive/diagnostic field test method.