This paper investigates the switching impulse and temporary overvoltage (TOV) duty for 400 kV underground power cables using ATP. This work together with the work reported in [I], investigates the f i l l range of transient overvoltages due to lightning, switching and other temporary overvoltages (TOVs) using ATP.[ I ] re-assesses the basic insulation level (BIL) for 400 kV oil-filled cables. The objective of this work was to check the impact of switching surges on the choice of BIL and to re-assess the switching impulse insulation level (SIL) and TOV withstand level for 400 kV cables. A comprehensive study of the transient overvoltages experienced by cables within National Grid's transmission system has been pegormed. This paper provides an argument, for reducing the BIL and SIL for 400 kV cables.
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