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CHAPTER 2: USING THE RTT ON SR SERIES RELAYS
THE SR750/760 FEEDER MANAGEMENT RELAY
RTT DESKTOP TEST SET– INSTRUCTION MANUAL
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2.2
The SR750/760 Feeder Management Relay
2.2.1
Overview
The SR750/760 Relay has 3-phase current inputs with a CT burden less than 0.2 VA at rated
load, and 3-phase voltage inputs with a greater than 576 KW VT burden. External contacts
can be connected to the Relay’s 14 logic inputs. These contacts can be either Dry or Wet
(which requires external source voltage greater than 30VDC). The SR750/760 Relay is
equipped with 8 output relays: three special purpose and five general purpose.
As the DC voltage of RTT Wet doesn’t meet SR750/760 requirement, only the Dry
connection is applicable. As there is no RTD feature in SR750/760, no modification of the
Test Cable is required.
Unused Wires
For the unused wires (9 in total), it is recommended that the 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- and R3C.