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FOUR C I RCU I T BUS
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CONNECT I ONS SAME AS PH · 1
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DC TR I P BUS
DEV I CE N
U
MBER CHART
PH . 1
87 - PERCENTAGE D I F FEREN T I AL RELAY, TYPE CA-6
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TO
BREAKER
TR I P
CO I LS
ICS
-
I ND I CAT I N G COMTACTOR SW I TCH
OP
-
OPERAT I NG CO I L
R - PA I RED RESTRA I N T CO I L
( TOP FRONT ELEMEN T )
S - PA I RED RESTRA I N T CO I L
(
BOTTOM R EAR ELEMENT )
T - PA I RED RE
S
TR
A
I NT CO I L
(
BOTTOM FRONT ELEMfN T )
I K
TYPE
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RELAY
86 - AUX 1 L l4RY TR I PP I NG RELAY , TYPE WL
l83A l 8 9
Fig. 6 . External Schematic o f O n e Set o f Type CA-6 Relays for Three and Four Circuit B us Protection.
5
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