The GCM05 DC Intertripping Relay has been designed to provide group intertripping of up to four remotely connected sites. The 15kV isolation level of the unit allows application for intertripping requirements of electrical networks where large induced voltages may be experienced on the pilot circuits.

In comparison to conventional isolated intertripping batteries and equipment, the GCM05 provides a simple means of utilising multi-terminal, minimum circuit breaker power system configurations. The efficient compact design of the intertrip relay allows the use of standard substation batteries and the elimination of many HV breakers whilst maintaining effective network protection and discrimination without the need for complex voice frequency, fibre optic or microwave communication systems.

When used in a retrofit situation, the relay will replace existing dc relays and the ancillary isolated battery banks, therefore eliminating the on-going procurement and maintenance costs of such systems.