ABB RELION REX640 Technical Manual page 1111

1MRS759142 F
CB_CLOSED
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: Frequency response of the peak integrated current calculator
Operate level detector
The Operate level detector compares I_PEAK_INT_x value to
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.
REX640
Technical Manual
I_A
I_B
I3P
I_C
BLOCK
Peak
Operate
integrated
level
current
detector
calculator
Alarm
level
detector
Under
current
detector
Blocking
logic
Figure 624
Protection functions
Timer 1
OPR_OVLOD
t
ST_OVLOD
Timer 2
t
ALARM
Timer 3
OPR_UN_I
t
ST_UN_I
Inhibit
BLK_CLOSE
reclose
.
Start value overload .
1111