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
No
Notte!
e!
• The low-voltage block is not in use when its pick-up setting is set to 0 %. The undervoltage
function is in trip stage when the LV block is disabled and the device has no voltage injection.
• After the low voltage blocking condition, the undervoltage stage does not trip unless the
voltage exceeds the pick-up setting first.
9.2.1.11 Neutral overvoltage protection (U0>; 59N)
Table. 9.2.1.11 - 408. Technical data for the neutral overvoltage function.
Measurement inputs
Voltage input (selectable)
Residual voltage from U3 or U4 voltage channel
Residual voltage calculated from U
L1
, U
L2
, U
L3
Voltage input magnitudes
RMS residual voltage U
0
Calculated RMS residual voltage U
0
Pick-up
Pick-up voltage setting
1.00…50.00 % U0
N
, setting step 0.01 × I
N
Inaccuracy:
- Voltage U0
- Voltage U0Calc
±1.5 %U0
SET
or ±30 mV
±150 mV
Operation time
Definite time function operating time setting
0.00…1800.00 s, setting step 0.005 s
Inaccuracy:
- Definite time (U0
M
/U0
SET
ratio 1.05
→
)
±1.0 % or ±45 ms
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
±1.5 % or ±20 ms
±20 ms
Instant operation time
Start time and instant operation time (trip):
- U0
M
/U0
SET
ratio 1.05
→
<50 ms
Reset
Reset ratio
97 % of the pick-up voltage setting
Reset time setting
Inaccuracy: Reset time
0.000 … 150.000 s, step 0.005 s
±1.0 % or ±50 ms
Instant reset time and start-up reset
<50 ms
9.2.1.12 Sequence voltage protection (U1/U2>/<; 47/27P/59NP)
Table. 9.2.1.12 - 409. Technical data for the sequence voltage function.
Measurement inputs
A
AQ
Q-M257
-M257
Instruction manual
Version: 2.07
488
© Arcteq Relays Ltd
IM00021
Summary of Contents for AQ-M257
Page 1: ...AQ M257 Motor protection IED Instruction manual...
Page 2: ......
