Three-phase transformer inrush and motor start-up current detector Inrush3, 3I
2f
>
Ratio I
2f
/I
1f
>
Start current
Operation mode
5…50%
0.10…5.00 x In
Not in use
Inrush mode
Start-up mode
Operation accuracy:
- current measurement
- ratio I
2f
/I
1f
measurement
Start time:
- internal time
- total time
Note! The values below apply when f/fn = 0.95...1.05
±2.5% of set value or ±0.01 x In
±5.0% of set value
<32 ms
<40 ms
Fuse failure supervision, FuseFail, FUSEF
Ratio U2/U1>
Ratio I2/I1<
10...50%
10...50%
Operation accuracy:
- when f/fn = 0.98...1.02:
- when f/fn = 0.95...1.05:
- injected negative-sequence voltage
BSOUT activation time:
- f/fn=0.98...1.02
Reset time
Reset ratio:
- for Ratio U2/U1>
- for Ratio I2/I1<
±2.0 percentage units (of settings Ratio U2/U1> and Ratio I2/I1<)
±4.0 percentage units (of settings Ratio U2/U1> and Ratio I2/I1<)
= 2.00 x Ratio U2/U1>
< 35 ms (within the same task and when the task interval is 10 ms)
20 ms (within the same task)
0.8...0.96
1.04...1.2
Table 8: Energizing inputs
Rated frequency 50.0/60.0 Hz
Current inputs rated current 1 A/5 A
thermal withstand
capability
continuously 4 A/20 A
for 1 s 100 A/500 A
dynamic current withstand, half-wave value 250 A/1250 A
input impedance <100 m<20 m
Voltage inputs rated voltage (parameterization) 100 V/110 V/115 V/120 V
voltage withstand, continuously 2 x U
n
(240 V)
burden at rated voltage <0.5 VA
Table 9: Auxiliary power supplies
Type PS1/240V
(RET 541,
RET 543)
PS2/240V
(RET 545
only)
External
display
module
PS1/48V
(RET 541,
RET 543)
PS2/48V
(RET 545
only)
Input voltage, ac 110/120/220/240 V -
Input voltage, dc 110/125/220 V 24/48/60 V
Voltage variation ac 85…110%, dc 80…120%
of rated value
dc 80…120% of rated value
Burden <50 W
Ripple in dc auxiliary voltage max. 12% of the dc value
Interruption time in auxiliary dc
voltage without resetting
<40 ms, 110 V and
<100 ms, 200 V
<60 ms, 48 V and
<100 ms, 60 V
Internal overtemperature
indication
+78C (+75…+83C)
Transformer Terminal RET 541, RET 543, RET 545
1MRS755543
32
To Next Page
Loading...
