What are the specifications for the order and number of positive and negative polarities applied in the impulse withstand voltage test of high-voltage cables? How to locate the fault point and analyze the cause of failure after a breakdown test?
High-Voltage Cable Impulse Withstand Voltage Test Specifications According to international standards IEC 60840 (for cables rated up to 150 kV and IEC 62067 (for cables rated above 150 kV up to 500 kV, the lightning impulse withstand voltage test must be conducted at a controlled elevated temperature—specifically with the cable conductor maintained between 90°C and 95°C (or the […]