Instruction manual – AP901S Arc Protection Unit
16 (43
)
A1027A
Logic scheme 3
The AP901S scheme 3 is very similar to scheme 2. S2 is used for monitoring the incoming
feeder breaker compartment. S3 monitors reserve busbar; S4 monitors the main busbar
compartment. The contact T1 is responsible for tripping section circuit breaker. T2 is
responsible for tripping coupler circuit breaker. BI1 and BI2 are responsible for recognizing
the incoming circuit breaker position. BI3 receives overcurrent information from the AP910P
of incoming feeder. BI4, BI5 and BI6 are used for sending light information from different
location of the busbars. BO1, BO2 and BO3 send arc fault information to incoming feeder
units and intermediate units.
Figure 3-4 AP901S logic scheme 3
General trip logic for AP901S (SS: 3)
TRIPPING SIGNALS
FAULT LOCATION
T1
T2
T3
BO1
BO2
BO3
S2
╳
╳
╳
╳
╳
╳
S3
╳
╳
╳
╳
S4
╳
╳
╳
╳
Summary of Contents for AP901S
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