Voltage inputs
U
L1
, U
L2
, U
L3
U
L12
, U
L23
, U
L31
(+ U
0
)
Voltage input calculations
Positive sequence voltage (I1)
Negative sequence voltage (I2)
Pick-up
Pick-up setting
5.00…150.00 %U
N
, setting step 0.01 %U
N
Inaccuracy:
- Voltage
±1.5 %U
SET
or ±30 mV
Low voltage block
Pick-up setting
1.00…80.00 %U
N
, setting step 0.01 %U
N
Inaccuracy:
-Voltage
±1.5 %U
SET
or ±30 mV
Operation time
Definite time function operating time setting
0.00…1800.00 s, setting step 0.005 s
Inaccuracy
-Definite Time (U
M
/U
SET
ratio 1.05
→
)
±1.0 % or ±35 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):
- U
M
/U
SET
ratio <0.95/1.05
→
<65 ms
Reset
Reset ratio
97 or 103 % of the pick-up voltage setting
Reset time setting
Inaccuracy: Reset time
0.010…10.000 s, step 0.005 s
±1.0 % or ±35 ms
Instant reset time and start-up reset
<50 ms
9.2.1.13 Overfrequency and underfrequency protection (f>/<; 81O/81U)
Table. 9.2.1.13 - 410. Technical data for the overfrequency and underfrequency function.
Input signals
Sampling mode
Fixed
Tracking
Frequency reference 1
Frequency reference 2
Frequency reference 3
CT1IL1, CT2IL1, VT1U1, VT2U1
CT1IL2, CT2IL2, VT1U2, VT2U2
CT1IL3, CT2IL3, VT1U3, VT2U3
Pick-up
f> pick-up setting
f< pick-up setting
10.00…70.00 Hz, setting step 0.01 Hz
7.00…65.00 Hz, setting step 0.01 Hz
Inaccuracy (sampling mode):
- Fixed
- Tracking
±20 mHz (50/60 Hz fixed frequency)
±20 mHz (U > 30 V secondary)
±20 mHz (I > 30 % of rated secondary)
A
AQ
Q-M257
-M257
Instruction manual
Version: 2.07
© Arcteq Relays Ltd
IM00021
489
Summary of Contents for AQ-M257
Page 1: ...AQ M257 Motor protection IED Instruction manual...
Page 2: ......
