Inaccuracy
-Voltage
±1.5 %U
SET
or ±30 mV
Low voltage block
Pick-up setting
0.00…80.00 %Un, setting step 0.01 %Un
Inaccuracy
-Voltage
±1.5 %U
SET
or ±30 mV
Operation time
De nite time function operating time setting
0.00…1800.00 s, setting step 0.005 s
Inaccuracy
-De nite Time (Um/Uset ratio 1.05
→
)
±1.0 % or ±35 ms
IDMT operating time setting (ANSI / IEC)
0.02…1800.00 s, setting step 0.001 x parameter
IDMT setting parameters
k Time dial setting for IDMT
A IDMT Constant
B IDMT Constant
C IDMT Constant
0.01…25.00 step 0.01
0…250.0000 step 0.0001
0…5.0000 step 0.0001
0…250.0000 step 0.0001
Inaccuracy
-IDMT operating time
-IDMT minimum operating time; 20 ms
±1.5 % or ±20 ms
±20 ms
Instant operation time
Start time and instant operation time (trip):
-Um/Uset ratio 1.05
→
<65 ms
Retardation time (overshoot)
<30 ms
Reset
Reset ratio
103 % of pick-up voltage setting
Reset time setting
Inaccuracy: Reset time
0.010 … 10.000 s, step 0.005 s
±1.0 % or ±45 ms
Instant reset time and start-up reset
<50 ms
Note!
LV block is not in use when set to 0 %. Undervoltage is on trip stage if LV block is disabled and
IED is without voltage injection.
After blocking condition, under voltage stage won’t trip unless voltage is higher than pick-up
setting rst.
9.2.1.11. Neutral overvoltage (59N) U0>
Table. 9.2.1.11. - 272. Neutral overvoltage (59N) technical data
Input signals
Input magnitudes
U0 voltage fundamental frequency RMS
Pick-up
Pick-up voltage setting
1.00…50.00 % U0n, setting step 0.01 x In
Inaccuracy
-Voltage U0
-Voltage U0Calc
±1.5 %U0
SET
or ±30 mV
±150 mV
Operation time
De nite time function operating time setting
0.00…1800.00 s, setting step 0.005 s
Inaccuracy
-De nite Time (U0m/U0set ratio 1.05
→
)
±1.0 % or ±45 ms
AQ-T257
Instruction manual
Version: 2.00
© Arcteq Relays Ltd
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