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TYPE 85 TRANSFER TRIP SYSTEM
TYPE 85 TRANSFER TRIP SYSTEM
GENERAL The SMC Transfer Trip System is used to trip a remote feeder breaker when the local substation feeder breaker detects a fault condition on the third rail or overhead trolley line. The system can also be used as an interlock. The SMC Transfer Trip System consists of two parts: a transmitting unit and a receiving unit. A typical installation may have the transmitter and receiver located up to 4 miles apart. The maximum distance is determined by the resistance of the wires used to connect the transmitter to the receiver.
DESCRIPTION TRANSMITTER: The transmitter used in the SMC Transfer Trip System consists of input power protection circuitry, a high efficiency DC chopper constant current regulator, output protection circuitry, indicators for normal current output, and high line resistance. The transmitter is protected with a 0.5 amp fuse. Input power protection circuitry limits transients on the 125 VDC control power into the DC control power into the DC chopper circuit and the voltage is clamped at 240 VDC.
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