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CHAPTER 2: USING THE RTT ON SR SERIES RELAYS
2.5
The SR735/737 Feeder Protection Relay
2.5.1
Overview
RTT DESKTOP TEST SET– INSTRUCTION MANUAL
The SR735/737 Relay has 3-phase current inputs with a CT burden 0.02 VA at rated load.
The SR745 Relay is equipped with three separate dry contact relays - TRIP, AUX and
SERVICE. TRIP and AUX are identical non-fail-safe Form A contacts, both of which close
whenever the unit trips. The SERVICE relay is in failsafe mode.
As the SR735/737 Relay doesn't have Voltage Input, Contact Input and RTD features, no
modification to the Test Cable is required.
Unused Wires
For the unused wires (20 in total), it is recommended that user tape the lugs to ensure
isolation of the contacts so that no problems are caused by wires touching.
The unused wires are: R1+, R1-, R1C, R2+, R2-, R2C, R3+, R3-, R3C, DIC, DI8, DI7, DI6, DI5, DI4,
DI3, DI2, DI1, V+ and V-.
THE SR735/737 FEEDER PROTECTION RELAY
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