Distance protection and impedance-based fault location on overhead lines and power cables is being used by utilities all over the world. The Z1 positive-sequence impedance and Z0 zero-sequence impedance are significant characteristics of the protected line which must be known precisely in order for the relay to reliably decide whether or not to trip.
Accurate line impedances will increase the precision of calculating fault distances from stations in all types of scenarios. Therefore, Anchorage ML&P, a utility in Anchorage, USA with the support of Moritz Pikisch, OMICRON, used the CPC 100 + CP CU1 test system to measure line impedances to verify and optimize their distance relay parameterization.
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