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2.21
Date Code 20081022
Instruction Manual
SEL-787 Relay
Installation
AC/DC Control Connection Diagrams
The basic application of the SEL-787 relay is for a two-winding transformer. The SEL-787 base product offering provides
six current channels that are used to monitor the two transformer windings. Relay contact inputs can be used to monitor
high- and low-side breaker status. Relay contact outputs can be used to trip or close high and low side transformer
breakers.
, which illustrates tripping control of the two-power circuit breakers.
Figure 2.19
SEL-787 Provides Basic Two-Winding Transformer Differential Protection
IAW1
IBW1
ICW1
IAW2
IBW2
ICW2
SEL-787 Relay
52-1
52-2
A B C
a
b
c
200/5 A
138 kV
30 MVA
13.8 kV
2000/5 A
A
B
C
a
b
c
Note: The CT secondary circuit must be grounded in the relay cabinet.
Содержание SEL-787
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