VTS MCB trip bus/line (external input)
<50 ms
No
Notte!
e!
• When turning on the auxiliary power of an IED, the normal condition of a stage has to be
fulfilled before tripping.
9.2.3.3 Circuit breaker wear monitoring
Table. 9.2.3.3 - 428. Technical data for the circuit breaker wear monitoring function.
Pick-up
Breaker characteristics settings:
- Nominal breaking current
- Maximum breaking current
- Operations with nominal current
- Operations with maximum breaking current
0.00…100.00 kA, setting step 0.001 kA
0.00…100.00 kA, setting step 0.001 kA
0…200 000 operations, setting step 1 operation
0…200 000 operations, setting step 1 operation
Pick-up setting for Alarm 1 and Alarm 2
0…200 000 operations, setting step 1 operation
Inaccuracy
Inaccuracy for current/operations counter:
- Current measurement element
- Operation counter
0.1× I
N
> I < 2 × I
N
±0.2 % of the measured current, rest 0.5 %
±0.5 % of operations deducted
9.2.3.4 Total harmonic distortion
Table. 9.2.3.4 - 429. Technical data for the total harmonic distortion function.
Input signals
Current inputs
Phase current inputs: I
L1
(A), I
L2
(B), I
L3
(C)
Residual current channel I
01
(Coarse)
Residual current channel I
02
(Fine)
Current input magnitudes
Current measurement channels (FFT result) up to the 31
st
harmonic
component.
Pick-up
Operating modes
Power THD
Amplitude THD
Pick-up setting for all comparators
0.10…200.00 % , setting step 0.01 %
Inaccuracy
±3 % of the set pick-up value > 0.5 × I
N
setting; 5 mA < 0.5
× I
N
setting.
Time delay
Definite time function operating time setting for all
timers
0.00…1800.00 s, setting step 0.005 s
Inaccuracy:
- Definite time operating time
- Instant operating time, when I
M
/I
SET
ratio > 3
- Instant operating time, when I
M
/I
SET
ratio 1.05 <
I
M
/I
SET
< 3
±0.5 % or ±10 ms
Typically <20ms
Typically <25 ms
Reset
Reset time
Typically <10 ms
Reset ratio
97 %
A
AQ
Q-M257
-M257
Instruction manual
Version: 2.07
© Arcteq Relays Ltd
IM00021
501
Summary of Contents for AQ-M257
Page 1: ...AQ M257 Motor protection IED Instruction manual...
Page 2: ......
