Staged fault and laboratory tests on a cable pair protection system designed to serve power stations

Cable pairs entering power stations may be subjected to ground potential rise (GPR) and/or induction of several thousand volts during power system faults. A cable protection system designed to give a high degree of reliability is described, and the results of staged fault and laboratory tests are discussed. An analysis of neutralizing transformer transient performance shows how the transformer's behavior during fault conditions is determined by its volt-time capability.