Instruction manual – AP901S Arc Protection Unit
17 (43
)
A1027A
Logic Scheme 4
The AP901S scheme 4 is used as intermediate unit. Sensors are monitoring section circuit
breaker and the busbar between the section circuit breaker. BI3 and BI4 receive over
current information from two main busbar sections reprehensively. BO1 and BO3 represent
the arc fault detected at both main busbar sections.
Figure 3-5: AP901S logic scheme 4
General trip logic for AP901S (SS: 4)
TRIPPING SIGNALS
FAULT LOCATION
T1
T2
T3
BO1
BO2
BO3
S1
╳
╳
╳
S2
╳
╳
╳
╳
╳
S3
╳
╳
╳
S4
╳
╳
╳
Summary of Contents for AP901S
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