CA01065E_Catalog 70

Technical Terms

Steep front: A nominal discharge current impulse with a front time of 0.5 microseconds. Also referred to as front-of wave (FOW)

Strike distance: The distance in air of a line between two conductors on the arrester.

Switching Surge: The surge current when a system changes configuration.

TOV (Temporary Over Voltage): A power frequency (48 – 62 Hz) voltage in excess of normal line-to-ground voltage. A TOV is typically system generated. The magnitude and duration are a function of the power system parameters. U C : The designated root-mean-square (rms) value of power-frequency voltage that may be applied continuously between the terminals of the arrester.

Watts Loss: Power loss through an arrester while energized. Routine tests are conducted at 1.25 x MCOV.

Wet Withstand: Maximum power frequency voltage that the arrester can withstand in wet conditions without causing an external flashover of the housing.

Reliability

Page 29 | May 2022