ABB 615 Series - Signals

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