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 System consists of the IPD Relay, IPD Base Plate, Cable Connection Module (CCMD), Remote Termination Unit (RTU-D), a Remote Display Module (RDM), two 1000:1 Current Transformers, and an Earth Leakage Toroid.
The IPD Relay has four output relays. Relay MCR is used for the main contactor and Relay CBR is used for the circuit breaker. Relay RL3 can be turned off or configured to follow the Fan Interlock Drive output of the IPD Relay. Relay RL4 is used to activate the HV Insulation Test. All tripping logic and outlet control is performed by the IPD’s microprocessor, so that virtually no external control is required.
The IPD Integrated Protection Relay is approved for use in mining operations. 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.