What is the suitable test voltage for a watt-loss test on a silicon carbide surge arrester rated 6kV?

The suitable test voltage for a watt-loss test on a silicon carbide surge arrester rated at 6 kV is typically chosen to be between 75% and 125% of the rated voltage to effectively assess the performance of the device. In this case, a voltage of 5.0 kV represents approximately 83% of the rated voltage, making it appropriate for evaluating the watt-loss characteristics while minimizing the risk of damaging the arrester during testing.

This level allows for accurate measurement of the device's operational behavior under conditions that closely mimic actual service while remaining within safe testing limits. Using excessive voltage beyond what the arrester is rated for might lead to undesired results, or potentially compromise the integrity of the surge arrester, while too low a voltage might not provide meaningful data regarding its capabilities under operational stress.

Therefore, the selection of a 5.0 kV test voltage aligns with established practices for safely and effectively conducting a watt-loss test on surge arresters of this rating.