Seg HighTECH MRG3 - Earth Fault Supervision with Directional Feature; Determination of the Earth Fault Direction (MRG3-IER)

Manual MRG3 SEG Electronics GmbH
DOK-TD-MRG3, Rev. D 81
7.8.5 Earth fault supervision with directional feature
Setting range
Step (range)
Tolerance
U0>
3pha: 1 – 86%
e-n: 1 - 86 %
1:1: 1 - 150 %
1 (1...150)
2% of the set value or 1 %
from U
N
I
E
>
1...45 % (EXIT)
0.1 (1...5)
0.2 (5...10)
0.5 (10...20)
1 (20...45)
3% of the set value
or 0.3% I
N
tI
E
>V*
tI
E
>R**
0,1 - 300 s (EXIT)
(definite time)
0.1 (0.1...5.0)
0.2 (5.0...10.0)
0.5 (10...20)
1.0 (20...50)
2.0 (50...100)
5.0 (100...200)
10.0 (200...300)
3% bzw. 80 ms
I
E
>>
1...45 % (EXIT)
0.1 (1...5)
0.2 (5...10)
0.5 (10...20)
1 (20...45)
3% of the set value
or 0.3% I
N
tI
E
>>V*
tI
E
>>R**
0.1... 300 s (EXIT)
0.1 (0.1...5.0)
0.2 (5.0...10.0)
0.5 (10...20)
1.0 (20...50)
2.0 (50...100)
5.0 (100...200)
10.0 (200...300))
3% or 80 ms
Table 7.5: Earth fault supervision with directional feature
* Tripping time in forward direction (tripping range)
** Tripping time in backward direction (blocking range), see chapter 4.7.3
7.8.6 Determination of the earth fault direction (MRG3-IER)
Measurement of the energy
component of current in
compensated grids: I
E
x cos 
Measurement of the reactive
current component in
isolated grids: I
E
x sin 
Accuracy of angular
measurement: 3° at I
E
x cos  bzw. I
E
x sin  >5% I
E
Sensitive of the
residual voltage: >2% U
0N
bei I = 0.1 x I
EN