Reference Current of an SVU (Iref)

Reference Current of an SVU (Iref) IEC

Peak value (the higher peak value of the two polarities if the current is asymmetrical) of the resistive component of a power frequency current used to determine the reference voltage of the MOR.

NOTE 1 The reference current shall be high enough to make the effects of stray capacitances at the measured reference voltage of the MOR units negligible and is to be specified by the manufacturer.

NOTE 2 Depending on the nominal discharge current of the arrester, the reference current will be typically in the range of 0,05 mA to 1,0 mA per square centimeter of disc area for single column arresters.