Reset ratio
97 % of the pick-up current setting
Reset time setting
Inaccuracy: Reset time
0.010…10.000 s, step 0.005 s
±1.0 % or ±50 ms
Instant reset time and start-up reset
<50 ms
No
Notte!
e!
• The operation and reset time accuracy does not apply when the measured secondary
current in I02 is 1…20 mA. The pick-up is tuned to be more sensitive and the operation times
vary because of this.
9.2.1.3 Negative sequence overcurrent/ phase current reversal/ current unbalance
protection (I2>; 46/46R/46L)
Table. 9.2.1.3 - 205. 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
Inaccuracy:
- Definite time (I
m
/I
set
ratio > 1.05)
±1.5 % or ±60 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
±2.0 % or ±30 ms
±20 ms
Retardation time (overshoot)
<5 ms
Instant operation time
Start time and instant operation time (trip):
- I
m
/I
set
ratio > 1.05
<70 ms
Reset
Reset ratio
97 % of the pick-up setting
Reset time setting
Inaccuracy: Reset time
0.010…10.000 s, step 0.005 s
±1.5 % or ±60 ms
Instant reset time and start-up reset
<55 ms
A
AQ
Q-T256
-T256
Instruction manual
Version: 2.06
294
© Arcteq Relays Ltd
IM00028
Summary of Contents for AQ-T256
Page 1: ...AQ T256 Transformer protection IED Instruction manual...
Page 2: ......
