ABB REF615 G - Page 338

0
10 20
30
40
50 60 70
80
90 100
0
10
20
30
40
50
60
70
80
90
100
Total earth fault current (A), Rf = 0 ohm
Residual voltage (%)
Resonance, K = 1
0 10
20 30 40 50 60 70 80 90
100
0
10
20
30
40
50
60
70
80
90
100
Total earth fault current (A), Rf = 0 ohm
Residual voltage (%)
Over/Under-Compensated, K = 1.2/0.8
0 10 20 30 40 50
60
70
80 90 100
0
10
20
30
40
50
60
70
80
90
100
Total earth fault current (A), Rf = 0 ohm
Residual voltage (%)
Unearthed
Rf = 500 ohm
Rf = 2500 ohm
Rf = 5000 ohm
Rf = 10000 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.
0 10 20
30
40 50 60
70 80 90
100
0
10
20
30
40
50
60
70
80
90
100
Total earth fault current (A), Rf = 0 ohm
Residual voltage (%)
Resonance, K = 1
0 10
20
30
40
50 60 70
80
90100
0
10
20
30
40
50
60
70
80
90
100
Total earth fault current (A), Rf = 0 ohm
Residual voltage (%)
Over/Under-Compensated, K = 1.2/0.8
0 10 20
30
40
50
60 70 80 90 100
0
10
20
30
40
50
60
70
80
90
100
Total earth fault current (A), Rf = 0 ohm
Residual voltage (%)
Unearthed
Rf = 500 ohm
Rf = 2500 ohm
Rf = 5000 ohm
Rf = 10000 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.
0
10
20 30 40 50 60 70 80 90 100
0
10
20
30
40
50
60
70
80
90
100
Total earth fault current (A), Rf = 0 ohm
Residual voltage (%)
Resonance, K = 1
0 10 20 30 40 50 60 70 80 90
100
0
10
20
30
40
50
60
70
80
90
100
Total earth fault current (A), Rf = 0 ohm
Residual voltage (%)
Over/Under-Compensated, K = 1.2/0.8
0
10 20 30 40 50
60
70 80 90100
0
10
20
30
40
50
60
70
80
90
100
Total earth fault current (A), Rf = 0 ohm
Residual voltage (%)
Unearthed
Rf = 500 ohm
Rf = 2500 ohm
Rf = 5000 ohm
Rf = 10000 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.
Section 4 1YHT530004D05 D
Protection functions
332 615 series
Technical Manual