The integrated relay provides the necessary functions required for protecting electrical outlets supplying underground mining machinery. All of the protection functions are combined into a compact, plug-in unit, which can be easily changed out to minimise down time in the event of a problem with the relay.
The IPD-11kV Relay can provide machine communication through the use of a Remote Termination Unit (RTU-D) connected between the pilot and earth at the machine end of the trailing cable. Through the use of the RTU-D Remote Termination Unit the relay parameters are automatically up loaded from a remote machine when a cable is inserted into a power outlet.
The IPD-11kV Relay has 5 Digital inputs, which feed into a microprocessor unit. The microprocessor has been programmed to control four output relays. Relay MCR for the main contactor and Relay CBR for the circuit breaker. Relay RL3 is not used in the IPD-11kV. Relay RL4, when closed, applies 110V to the HV Test Module for the Insulation Test. All of the tripping logic and outlet control is performed by the microprocessor, so that virtually no external control is required.
The IPD-11kV Integrated Protection Relay is certified for Group I Hazardous areas. For the protection of mining equipment in hazardous areas the relay is installed in a flameproof enclosure with the Remote Display Module being installed outside the enclosure. This is possible because of its intrinsically safe design.