• The minimum voltage for direction solving is 1.0 V secondary. During three-phase short-
circuits the angle memory is active for 0.5 seconds in case the voltage drops below 1.0 V.
9.2.1.4 Directional earth fault protection (I0dir>; 67N/32N)
Table. 9.2.1.4 - 272. Technical data for the 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
)
Voltage input (selectable)
Residual voltage from U3 or U4 voltage channel
Residual voltage calculated from U
L1
, U
L2
, U
L3
Voltage input magnitudes
RMS residual voltage U
0
Calculated RMS residual voltage U
0
Pick-up
Characteristic direction
Unearthed (Varmetric 90°)
Petersen coil GND (Wattmetric 180°)
Earthed (Adjustable sector)
When the
earthed mode is active:
- Tripping area center
- Tripping area size (+/-)
0.00…360.00 deg, setting step 0.10 deg
45.00…135.00 deg, setting step 0.10 deg
Pick-up current setting
Pick-up voltage setting
0.005…40.00 × I
n
, setting step 0.001 × I
n
1.00…75.00 %U0
n
, setting step 0.01 %U0
n
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°
A
AQ
Q-T215
-T215
Instruction manual
Version: 2.04
392