3–8 745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
TYPICAL WIRING CHAPTER 3: INSTALLATION
Table 3–1: Rear terminal assignments (Sheet 1 of 2)
Term. Description Term. Description
Analog interface Outputs and ground CT N2
A1 Analog input + E1 Output 1: solid state trip (+)
A2 Analog input – E2 Output 2: trip relay (NO)
A3 Tap position (+) E3 Output 3: trip relay (NO)
A4 Tap position (–) E4 Output 4: trip relay (NO)
A5 Analog output (common) E5 Output 5: trip relay (NO)
A6 Analog output 1 (+) E6 Output 6: auxiliary relay (NO)
A7 Analog output 2 (+) E7 Output 6: auxiliary relay (NC)
A8 Analog output 3 (+) E8 Output 7: auxiliary relay (NO)
A9 Analog output 4 (+) E9 Output 8: auxiliary relay (NO)
A10 Analog output 5 (+) E10 Output 8: auxiliary relay (NC)
A11 Analog output 6 (+) E11 Output 9: service relay (common)
A12 Analog output 7 (+) E12 Ground: winding 2/3 CT
Communications and RTD inputs Outputs and ground CT N2
B1 Computer RS485 (+) / RS422 (Rx+) F1 Output 1: solid state trip (–)
B2 Computer RS485 (–) / RS422 (Rx–) F2 Output 2: trip relay (common)
B3 Computer RS485/RS422 (common) F3 Output 3: trip relay (common)
B4 RS422 (Tx+) F4 Output 4: trip relay (common)
B5 RS422 (Tx–) F5 Output 5: trip relay (common)
B6 External RS485 (+) F6 Output 6: auxiliary relay (common)
B7 External RS485 (–) F7 Output 7: auxiliary relay (NO)
B8 IRIG-B + F8 Output 7: auxiliary relay (NC)
B9 IRIG-B – F9 Output 8: auxiliary relay (common)
B10 RTD 1 hot F10 Output 9: service relay (NO)
B11 RTD 1 compensation F11 Output 9: service relay (NC)
B12 RTD 1 return F12 Ground: winding 2/3 CT
Logic inputs 9 to 16 and VT input CT inputs and 745 grounding
C1 Logic input 9 (+) G1 Phase A: winding 1 CT
C2 Logic input 10 (+) G2 Phase B: winding 1 CT
C3 Logic input 11 (+) G3 Phase C: winding 1 CT
C4 Logic input 12 (+) G4 Phase A: winding 2 CT
C5 Logic input 13 (+) G5 Phase B: winding 2 CT
C6 Logic input 14 (+) G6 Phase C: winding 2 CT
C7 Logic input 15 (+) G7 Phase A: winding 3 CT
C8 Logic input 16 (+) G8 Phase B: winding 3 CT
C9 Reserved G9 Phase C: winding 3 CT
C10 Reserved G10 Ground: winding 1/2 CT
C11 VT input
G11 745 filter ground
C12 VT input G12 745 safety ground
Logic inputs 1 to 8 and dedicated inputs CT and VT inputs / power
D1 Logic input 1 (+) H1 Phase A: winding 1 CT
D2 Logic input 2 (+) H2 Phase B: winding 1 CT
D3 Logic input 3 (+) H3 Phase C: winding 1 CT
D4 Logic input 4 (+) H4 Phase A: winding 2 CT
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