BLOCK
ST_OVLOD
OPR_OVLOD
ALARM
ST_UN_I
BLK_CLOSE
OPR_UN_I
CB_CLOSED
Blocking
logic
Operate
level
detector
Alarm
level
detector
Inhibit
reclose
Peak
integrated
current
calculator
Under
current
detector
I3P
I_C
I_B
I_A
t
Timer 1
t
Timer 2
t
Timer 3
Figure 623: Functional module diagram
Peak integrated current calculator
The peak integrated current calculator calculates peak value of integrated current
(I_PEAK_INT_A, I_PEAK_INT_B and I_PEAK_INT_C) which is proportional to the
voltage over capacitor. The I_PEAK_INT_A, I_PEAK_INT_B and I_PEAK_INT_C
values are available in monitored data view. The frequency response of the peak
integrated current calculator can be seen in
Figure 624
.
Figure 624: Frequency response of the peak integrated current calculator
Operate level detector
The Operate level detector compares I_PEAK_INT_x value to
Start value overload
.
If the phase or phases in which I_PEAK_INT_x exceeds the setting matches the
Num of start phases
setting, the Operate level detector module activates the Timer
1 module.
1MRS759142 F
Protection functions
REX640
Technical Manual
1111
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