ABB CI535V30 3BSE022162R1 interface communication module
(protection zones). The system monitors any
inconsistencies of the binary input circuits
connected to the isolator auxiliary contacts
and generates an alarm after a set time delay.
In the event of an isolator alarm, it is possible
to select the behavior of the busbar protection:
• blocked
• zone-selective blocked
• remain in operation
Differential current supervision
The differential current is permanently supervised. Any differential current triggers a timedelayed alarm. In the event of a differential
current alarm, it is possible to select the
behavior of the busbar protection:
• blocked
• zone-selective blocked
• remain in operation
Trip redirection
A binary input channel can be provided to
which the external signal monitoring the circuit-breaker air pressure is connected. Tripping is not possible without active signal.
When it is inactive, a trip generated by the
respective bay unit is automatically redirected
to the station at the opposite end of the line
and also to the intertripping logic to trip all the
circuit-breakers connected to the same section of busbar.
The trip redirection can also be configured
with a current criterion (current release criteria).
Table 2
N/O
contact:
“Isolator
CLOSED”
N/C
contact:
“Isolator
OPEN”
Isolator position
open open Last position stored
(for busbar protection)
+ delayed isolator
alarm, + switching prohibited signal
open closed OPEN
closed open CLOSED
closed closed CLOSED
+ delayed isolator
alarm, + switching prohibited signal

Human machine interface (HMI)
The busbar protection is configured and main tained with the aid of human machine inter faces at three levels.
Local HMI
The local display interface installed in the cen tral unit and in the bay units comprises:
• a four-line LCD with 16 characters each for
displaying system data and error mes sages
• keys for entering and display as well as 3
LEDs for the display of trips, alarms and
normal operation.
• in addition 20 freely programmable LEDs
for user-specific displays on the bay unit
500BU03 and central unit 500CU03.
The following information can be displayed:
• measured input currents and voltages
• measured differential currents (for the bus bar protection)
• system status, alarms
• switchgear and isolator positions (within
the busbar protection function)
• starting and tripping signals of protection
functions