1MAC050144-MB C
Section 5
Protection related functions
615 series ANSI
389
Technical Manual
Retrip logic
The operation of the retrip logic can be described by using a module diagram:
Figure 189:
Retrip logic internal design
The retrip function operates with or without a current check selected with the
CB fail retrip
mode
setting. In "Current check" mode, the retrip is only performed if the current through
the circuit breaker exceeds the
Current value
level. In "Without check" mode, the retrip is
done without checking the phase currents.
The
CB failure mode
setting is used to select the mode the breaker fault is detected with.
In "Current" mode, the detection is based on the current level exceeding. In "Breaker
status" mode, the detection is based on the closed position of the circuit breaker after a trip
signal is issued, that is, after a long duration of the trip signal. In "Both" mode, the
detection is based either on the exceeding of
Current value
level or on the long duration
of the trip signal. When external information of a circuit breaker fault is connected to the
active
CB_FAULT
input, the retrip function is not allowed to trip.. The blocking is used to
disable the whole function.
Back-up trip logic
The operation of the back-up trip logic can be described by using a module diagram:
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