Inaccuracy:
- Starting I01 (1 A)
- Starting I02 (0.2 A)
- Starting I0Calc (5 A)
- Voltage U0 and U0Calc
- U0/I0 angle (U > 15 V)
- U0/I0 angle (U = 1…15 V)
±0.5 %I0
set
or ±3 mA (0.005…10.0 × I
set
)
±1.5 %I0
set
or ±1.0 mA (0.005…25.0 × I
set
)
±1.5 %I0
set
or ±15 mA (0.005…4.0 × I
set
)
±1.0 %U0
set
or ±30 mV
±0.2° (I0Calc ±1.0°)
±1.0°
Operation time
Definite time function operating time setting
0.00…1800.00 s, setting step 0.005 s
Inaccuracy:
- Definite time (I
m
/I
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 ±25 ms
±20 ms
Instant operation time
Start time and instant operation time (trip):
- I
m
/I
set
ratio > 3
- I
m
/I
set
ratio = 1.05…3
<55 ms (typically 45 ms)
<65 ms
Reset
Current and voltage reset
U0/I0 angle
97 % of the pick-up current and voltage setting
2.0°
Reset time setting
Inaccuracy: Reset time
0.000…150.000 s, step 0.005 s
±1.0 % or ±45 ms
Instant reset time and start-up reset
<50 ms
9.2.1.5 Negative sequence overcurrent/ phase current reversal/ current unbalance
protection (I2>; 46/46R/46L)
Table. 9.2.1.5 - 402. Technical data for the current unbalance function.
Measurement inputs
Current inputs
Phase current inputs: I
L1
(A), I
L2
(B), I
L3
(C)
Current input calculations
Positive sequence current (I1)
Negative sequence current (I2)
Pick-up
Used magnitude
Negative sequence component I2pu
Relative unbalance I2/I1
Pick-up setting
0.01…40.00 × I
n
, setting step 0.01 × I
n
(I2pu)
1.00…200.00 %, setting step 0.01 % (I2/I1)
Minimum phase current (at least one phase above)
0.01…2.00 × I
n
, setting step 0.01 × I
n
Inaccuracy:
- Starting I2pu
- Starting I2/I1
±1.0 %-unit or ±100 mA (0.10…4.0 × I
n
)
±1.0 %-unit or ±100 mA (0.10…4.0 × I
n
)
Operating time
Definite time function operating time setting
0.00…1800.00 s, setting step 0.005 s
A
AQ
Q-M257
-M257
Instruction manual
Version: 2.07
© Arcteq Relays Ltd
IM00021
483
Summary of Contents for AQ-M257
Page 1: ...AQ M257 Motor protection IED Instruction manual...
Page 2: ......
