Alarm channels
12 individual alarm channels
Settable alarms
24 alarms available (two per each alarm channel)
Pick-up
Alarm setting range
Inaccuracy
Reset ratio
101.00…2000.00 deg, setting step 0.1 deg (either < or > setting)
±3 % of the set pick-up value
97 % of the pick-up setting
Operation
Operating time
Typically <500 ms
9.2.1.23 Power factor protection (PF<; 55)
Table. 9.2.1.23 - 420. Technical data for the power factor protection function.
Measurement inputs
Current inputs
Phase current inputs: I
L1
(A), I
L2
(B), I
L3
(C)
Voltage inputs
U
L1
, U
L2
, U
L3
U
L12
, U
L23
, U
L31
(+ U
0
)
Calculated measurement
Three-phase power factor
Pick-up
Pick-up setting
0.00…0.99, setting step 0.01
Inaccuracy:
- power factor (when U > 1.0 V and I > 0.1 A)
±0.001
Operation time
Definite time function operating time setting
0.00…1800.00 s, setting step 0.005 s
Inaccuracy:
- Definite time (at least 0.01 below the setting)
±1.0 % or ±30 ms
Instant operation time
Start time and instant operation time (trip):
- at least 0.01 below the setting
<50 ms
Reset
Reset ratio
1.03 of the power factor setting
Reset time
<50 ms
No
Notte!
e!
• The minimum voltage for the power factor calculation is 1.0 V secondary and the minimum
current is 0.1 A secondary.
9.2.1.24 Generator/transformer differential protection (Idb>/Idi>/I0dHV>/I0dLV>; 87T/
87N/87G)
Table. 9.2.1.24 - 421. Technical data for the transformer differential protection function.
Measurement inputs
Current inputs (CT1 and CT2 current measurement
module)
Phase current inputs: I
L1
(A), I
L2
(B), I
L3
(C)
Residual current channel I
01
(Coarse)
Residual current channel I
02
(Fine)
Calculated residual current: I
L1
(A), I
L2
(B), I
L3
(C)
A
AQ
Q-M257
-M257
Instruction manual
Version: 2.07
496
© Arcteq Relays Ltd
IM00021
Summary of Contents for AQ-M257
Page 1: ...AQ M257 Motor protection IED Instruction manual...
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