Schweitzer Engineering Laboratories SEL-787-2 Manual page 31

L
A2 (H1)
b (T2)
a (T1)
A1 (X1)
N
Note: The CT secondary circuit should be grounded in the relay cabinet.
Figure 45 SEL-787-4X Provides 3-Winding Transformer Differential Protection, REF Protection, Overcurrent
Protection, and Fan Bank Control With LTC Monitoring
Schweitzer Engineering Laboratories, Inc.
a b
2000/5 A
52-4
13.8 kV
T1 T2
B2 (H2)
C2 (H3)
30 MVA
c (T3)
A1 B1
B1 (X2)
C1 (X3)
400/5 A
69 kV
52-1
IAW3
X1 X2
H1
H2
IBW3
52-2
138 kV
200/5 A
A2 B2
c
E01
E02
E03
E04
E05
T3
E06
E07
E08
E09
E10
C1 E11
E12
X3
Z01
Z02
Z03
Z04
H3
Z05
Z06
Z07
Z08
Z09
Z10
Z11
Z12
SEL-787-4X Relay
C2
IAW3
IBW3
ICW3
IAW4
IBW4
ICW4
SEL-2600
IAW1
IBW1
ICW1
IAW2
IBW2
ICW2
SEL-787-2, -3, -4 Data Sheet
31
RTDs