GE 845 - Page 56

2–12 845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
ELECTRICAL INSTALLATION CHAPTER 2: INSTALLATION
Figure 2-14: Typical Wiring Diagram for a 2-Winding Transformer with VTs on HV Side
WYE VT
845 Transformer Protection System
PHASE CTs
W1 BREAKER
Phase C
Phase B
Phase A
TRANSFORMER
W2 BREAKER
SLOT J
Typical auxiliary
contacts connection
SLOT K
+24 V
F21
COMMON
DIGITAL INPUT 7
DIGITAL INPUT 6
DIGITAL INPUT 5
DIGITAL INPUT 4
DIGITAL INPUT 3
DIGITAL INPUT 2
DIGITAL INPUT 1
F20
F19
F18
F17
F16
F15
F14
F13
SLOT D
SLOT E
G1 G2 G3 G4 G5 G6 G7 G8 G9 G10 G11 G12 G13 G14 G15 G16 G17 G18 G19 G20 G21 G22 G23 G24
DCmA I/O
ANALOG OUTPUT
ANALOG INPUT
RTD
1
12
34567
11
2
34
SHIELD
SHIELD
SHIELD
RETURN
HOT
COMP
RESER VED
RESER
VED
RETURN
RETURN
AMBIENT
TEMPERATURE
H9
DIGITAL INPUT 7
DIGITAL INPUT 6
DIGITAL INPUT 5
DIGITAL INPUT 4
DIGITAL INPUT 3
DIGITAL INPUT 2
DIGITAL INPUT 1
H8
H7
H6
H5
H4
H3
H2
H1
+24 V
H12
COMMON
DIGITAL INPUT 10
H11
H10
DIGITAL INPUT 9
DIGITAL INPUT 8
SLOT G: I/O_L (OPTIONAL)
CH1
CH4
CH3
CH2
FIBER INPUT 1
FIBER INPUT 2
FIBER INPUT 3
FIBER INPUT 4
C9
C8
C7
C6
C5
C4
C3
C2
C1
C12
C11
C10
C15
C14
C13
C18
C17
C16
SHIELD
RETURN
COMP
HOT
COMP
HOT
RETURN
COMP
HOT
HOT
RESERVED
SHIELD
COMP
RETURN
COMP
HOT
COMP
HOT
RTD 7
RTD 7/8
RTD 8
RTD 9
RTD 10
RTD 11
RTD 12
RTD 9/10
B9
B8
B7
B6
B5
B4
B3
B2
B1
B12
B11
B10
B15
B14
B13
B18
B17
B16
SHIELD
RETURN
COMP
HOT
COMP
HOT
RETURN
COMP
HOT
HOT
RESERVED
SHIELD
COMP
RETURN
COMP
HOT
COMP
HOT
RTD 1
RTD 1/2
RTD 2
RTD 3
RTD 4
RTD 5
RTD 6
RTD 3/4
RTD 5/6
SLOT B OR C: I/O_R OR I/O_S* (OPTIONAL)
* SUPPORTS 10 OHM COPPER RTD AS WELL
G/H2
G/H1
G/H24
G/H23
G/H22
G/H12
G/H11
G/H10
G/H9
G/H8
G/H7
G/H6
G/H5
G/H4
G/H3
+24 V
G/H21
COMMON
DIGITAL INPUT 7
DIGITAL INPUT 6
DIGITAL INPUT 5
DIGITAL INPUT 4
DIGITAL INPUT 3
DIGITAL INPUT 2
DIGITAL INPUT 1
G/H20
G/H19
G/H18
G/H17
G/H16
G/H15
G/H14
G/H13
SLOT G OR H: I/O_A* (OPTIONAL)
ANY MEASURED
OR METERED
ANALOG PARAMETER
OUTPUTS
* SLOT H I/O_A IS AVAILABLE WHEN SLOT G IS WITH I/O_L
ANY MEASURED OR
METERED ANALOG PARAMETER
INPUTS
SLOT A
TRIP W1 BKR
TRIP
COIL
52a
52a
+
-
-
+
CIRCUIT
TRIP W2 BKR
CIRCUIT
TRIP
COIL
52b
52a
52b
52a
W1 BREAKER
W2 BREAKER
BCD DECODER
CLOSE W1 BKR
COIL
52b
52b
+
-
-
+
CIRCUIT
CLOSE W2 BKR
CIRCUIT
COIL
OHMS
INPUT
CABLE SHIELD TO BE GROUNDED
AT PLC/COMPUTER END ONLY
A
C
B
LTC TAP
POSITION
IF OHMS
INPUT
SHIELD
PHASE CTs
892841A2