The
ALARM
output of the CT supervision function can be used to energize an auxiliary
relay which can short-circuit the current CT wires, making the busbar differential
protection inoperative. This arrangement does not prevent unwanted operation of 87A,
87B, 87C if the pickup setting is below the rated load. For example, if the pickup setting
for 87A, 87B, 87C in the example is set as 0.8 pu 87A, 87B, 87C trips before MCS-A,
MCS-B, MCS-C.
6.3.7
Signals
Table 747:
MCS-A Input signals
Name
Type
Default
Description
I_A
SIGNAL
0
Phase A current
BLOCK
BOOLEAN
0=False
Block signal for activating blocking mode
Table 748:
MCS-B Input signals
Name
Type
Default
Description
I_B
SIGNAL
0
Phase B current
BLOCK
BOOLEAN
0=False
Block signal for activating blocking mode
Table 749:
MCS-C Input signals
Name
Type
Default
Description
I_C
SIGNAL
0
Phase C current
BLOCK
BOOLEAN
0=False
Block signal for activating blocking mode
Table 750:
MCS-A Output signals
Name
Type
Description
ALARM
BOOLEAN
Alarm output
Table 751:
MCS-B Output signals
Name
Type
Description
ALARM
BOOLEAN
Alarm output
Table 752:
MCS-C Output signals
Name
Type
Description
ALARM
BOOLEAN
Alarm output
Section 6
1MAC059074-MB A
Supervision functions
858
615 series ANSI
Technical Manual
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