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PRIM
Protective Relay Indicator Module
The Protective Relay Indicator Module provides simultaneous tripping of up to four circuit breakers, controlled by any one of up to four protective relay outputs. It also provides a visual indication (via LEDs D1-D4) of which relay initiated the trip operation. For example, if a sud- den pressure auxiliary relay output connected to input #2 of the PRIM were activated, the module would transfer the trip signal (through the field test switch) to the trip input of the Series 24 Electric Reset Lock-Out Relay. This causes the LOR to index to the trip position. The normally open contacts of the LOR will close, transferring TRIP signals (through the field test switch) to the circuit breaker coils. The PRIM will also turn on LED D2, indicating that relay #2 initiated the trip operation. The LOR can be manually reset, or reset electrically through a momentary closure of S2. The Series 24 manual switch is used as an ON/Off switch for power to the module. Operational Description MAIN BUS CB #1 CB #2 CB #3 CB #4 “SPR”–Sudden Pressure Relay “CB”– Circuit Breaker S P R TRANSFORMER #4 S P R TRANSFORMER #1 S P R TRANSFORMER #3 S P R TRANSFORMER #2 Typical Application