ABB RED615 Technical Manual page 338

Section 4
Protection functions
332
Unearthed
100
90
Rf = 500 ohm
80
Rf = 2500 ohm
70
Rf = 5000 ohm
60
Rf = 10000 ohm
50
40
30
20
10
0
0 10 20 30 40 50 60 70 80 90 100
Total earth f ault current (A), Rf = 0 ohm
GUID-2F3654EF-9700-4FB7-B73C-85F7ED5D8EEF V1 EN
Figure 169: Influence of fault resistance on the residual voltage magnitude in
10 kV unearthed and compensated networks. The leakage
resistance is assumed to be 30 times larger than the absolute
value of the capacitive reactance of the network. Parallel resistor of
the compensation coil is assumed to be disconnected.
Unearthed
100
90
80 Rf = 500 ohm
Rf = 2500 ohm
70
Rf = 5000 ohm
60
Rf = 10000 ohm
50
40
30
20
10
0
0 10 20 30 40 50 60 70 80 90 100
Total earth f ault current (A), Rf = 0 ohm
GUID-3880FB01-5C89-4E19-A529-805208382BB1 V1 EN
Figure 170: Influence of fault resistance on the residual voltage magnitude in
15 kV unearthed and compensated networks. The leakage
resistance is assumed to be 30 times larger than the absolute
value of the capacitive reactance of the network. Parallel resistor of
the compensation coil is assumed to be disconnected.
Unearthed
100
90
80
Rf = 500 ohm
Rf = 2500 ohm
70
Rf = 5000 ohm
60
Rf = 10000 ohm
50
40
30
20
10
0
0 10 20 30 40 50 60 70 80 90100
Total earth f ault current (A), Rf = 0 ohm
GUID-6321328D-6C17-4155-A2DF-7E1C47A44D53 V1 EN
Figure 171: Influence of fault resistance on the residual voltage magnitude in
20 kV unearthed and compensated networks. The leakage
resistance is assumed to be 30 times larger than the absolute
value of the capacitive reactance of the network. Parallel resistor of
the compensation coil is assumed to be disconnected.
Resonance, K = 1
100
90
80
70
60
50
40
30
20
10
0
0 10 20 30 40 50 60 70 80 90 100
Total earth f ault current (A), Rf = 0 ohm
Resonance, K = 1
100
90
80
70
60
50
40
30
20
10
0
0 10 20 30 40 50 60 70 80 90100
Total earth f ault current (A), Rf = 0 ohm
Resonance, K = 1
100
90
80
70
60
50
40
30
20
10
0
0 10 20 30 40 50 60 70 80 90 100
Total earth f ault current (A), Rf = 0 ohm
1YHT530004D05 D
Over/Under-Compensated, K = 1.2/0.8
100
90
80
70
60
50
40
30
20
10
0
0 10 20 30 40 50 60 70 80 90 100
Total earth f ault current (A), Rf = 0 ohm
Over/Under-Compensated, K = 1.2/0.8
100
90
80
70
60
50
40
30
20
10
0
0 10 20 30 40 50 60 70 80 90100
Total earth f ault current (A), Rf = 0 ohm
Over/Under-Compensated, K = 1.2/0.8
100
90
80
70
60
50
40
30
20
10
0
0 10 20 30 40 50 60 70 80 90 100
Total earth f ault current (A), Rf = 0 ohm
615 series
Technical Manual