Chapter 8 - CB Fail Protection
5
UNDERCURRENT AND ZCD LOGIC FOR CB FAIL
IA
I< Current Set
IB
I< Current Set
IC
I< Current Set
IN
IN< Current Set
ISEF
ISEF< Current
IA
IB
IC
IN
ISEF
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Figure 105: Undercurrent and Zero Crossing Detection Logic for CB Fail
190
Zero Crossing Detection
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IA< Start
IB< Start
IC< Start
IN< Start
ISEF< Start
ZCD IA<
ZCD IB<
ZCD IC<
ZCD IN<
ZCD ISEF<
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