Start time and instant operation time (trip):
- I
m
/I
set
ratio = 2
- I
m
/I
set
ratio = 5
- I
m
/I
set
ratio = 10
Typically 25 ms
Typically 16 ms
Typically 12 ms
Reset
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 release delay does not apply to phase-specific tripping.
9.2.1.2 Non-directional earth fault protection (I0>; 50N/51N)
Table. 9.2.1.2 - 204. Technical data for the non-directional earth fault function.
Measurement inputs
Current input (selectable)
Residual current channel I
01
(Coarse)
Residual current channel I
02
(Fine)
Calculated residual current: I
L1
(A), I
L2
(B), I
L3
(C)
Current input magnitudes
RMS residual current (I
01
, I
02
or calculated I
0
)
TRMS residual current (I
01
or I
02
)
Peak-to-peak residual current (I
01
or I
02
)
Pick-up
Used magnitude
Measured residual current I01 (1 A)
Measured residual current I02 (0.2 A)
Calculated residual current I0Calc (5 A)
Pick-up current setting
0.0001…40.00 × I
n
, setting step 0.0001 × I
n
Inaccuracy:
- Starting I01 (1 A)
- Starting I02 (0.2 A)
- Starting I0Calc (5 A)
±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
)
±1.0 %I0
set
or ±15 mA (0.005…4.0 × I
set
)
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 > 3
- Definite time: I
m
/I
set
ratio = 1.05…3
±1.0 % or ±20 ms
±1.0 % or ±30 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
Retardation time (overshoot)
<30 ms
Instant operation time
Start time and instant operation time (trip):
- I
m
/I
set
ratio > 3.5
- I
m
/I
set
ratio = 1.05…3.5
<50 ms (typically 35 ms)
<55 ms
Reset
A
AQ
Q-T256
-T256
Instruction manual
Version: 2.06
© Arcteq Relays Ltd
IM00028
293
Summary of Contents for AQ-T256
Page 1: ...AQ T256 Transformer protection IED Instruction manual...
Page 2: ......
