High-voltage testing of medium-voltage shielded power cables

摘要

Medium-voltage power cables rated 2001-35000 V are tested using both 60 Hz AC voltage and DC voltage before leaving the cable manufacturing plant. Shielded medium-voltage cables are also required to meet the corona extinction level voltage established. These shielded cables are to be free of partial discharge at voltages well above operating voltages. In addition to these factory tests, the user normally requires a DC high-potential test after installation and sometimes a test is required when the cable is still on the reel. These various tests are also discussed.