Pilot wire current differential feeder protection
The 7PG21 is a three-phase unit differential protection used to detect in zone phase and earth faults. The relay is applied to the overhead line and underground cable circuits as well as shorter circuits such as interconnectors.
The 7PG21 is a three-phase unit differential protection used to detect in zone phase and earth faults. The relay is applied to the overhead line and underground cable circuits as well as shorter circuits such as interconnectors.