GE B30 UR Series

GE Multilin B30 Bus Differential System 9-9
9 THEORY OF OPERATION 9.5 SATURATION DETECTOR
9
Figure 9–8: SATURATION DETECTOR STATE MACHINE
NORMAL
SAT:=0
EXTERNAL
FAULT
SAT:=1
EXTERNAL
FAULT and CT
SATURATION
SAT:=1
The differential
characteristic
entered
The differential-
restraining trajectory
out of the differential
characteristic for a
certain period of time
saturation
condition
The differential
current below the
first slope for a
certain period of
time
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