GE RTT, Instruction Manual, Page: 43 / 94

CHAPTER 2: USING THE RTT ON SR SERIES RELAYS THE SR745 TRANSFORMER MANAGEMENT RELAY
RTT DESKTOP TEST SET– INSTRUCTION MANUAL 39
2.4.4 RTT to SR745 Wiring Diagram
1. Ensure that Wet/Dry Input Type switch is set to DRY before applying power to the RTT
unit. The SR745 Relay accepts only dry contact connections to the RTT.
2. Ensure that current and voltage knobs are turned fully counter-clockwise before
applying power to the RTT unit.
Note
*The 745 Relay has only one channel of RTD input.
**Trip 2 and Trip 3 Common terminals must be hardwired together.
Table 2–4: SR745 with RTT Set to Dry
RTDs*
RTD3 +
RTD3 -
RTD3 C
RTD2 +
RTD2 -
RTD2 C
RTD RTD HOT B10 ------------------------- RTD1 +
RTD RETURN B12 ------------------------- RTD1 -
RTD COMP B11 ------------------------- RTD1 C
SPARE
Contact
Outputs**
TRIP 3 COMMON F3 ---------------
RTT
TRIP 2 COMMON F2 ------------------------- OUTPUT C
TRIP 3 NO E3 ------------------------- OUTPUT 2
TRIP 2 NO E2 -------------------------
OUTPUT 1
Contact
Inputs
Logic Power Out + D11 ------------------------- INPUT C
Logic Input 7 D7 ------------------------- INPUT 8
Logic Input 6 D6 ------------------------- INPUT 7
Logic Input 5 D5 ------------------------- INPUT 6
Logic Input 4 D4 ------------------------- INPUT 5
Logic Input 3 D3 ------------------------- INPUT 4
Logic Input 2 D2 ------------------------- INPUT 3
Logic Input 1 D1 ------------------------- INPUT 2
Assess - D10 -------------------------
INPUT 1
CTs
Winding 1 I
a
+
H1 -------------------------
I
+
Winding 1 I
a
-
G1 -------------------------
I
-
VTs
VT C11 -------------------------
V
+
VT COM C12 -------------------------
V
-