ABB 615 Series - Page 401

0 10 20 30 40 50 60 70 80 90 100
0
10
20
30
40
50
60
70
80
90
100
Total ground fault current (A), Rf = 0 ohm
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 ground fault current (A), Rf = 0 ohm
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 ground fault current (A), Rf = 0 ohm
Residual voltage (%)
Ungrounded
Rf = 500 ohm
Rf = 2500 ohm
Rf = 5000 ohm
Rf = 10000 ohm
Residual voltage (%)
Residual voltage (%)
GUID-61455001-8012-43B9-867D-AD579844CE7F V1 EN
Figure 188: Influence of fault resistance on the residual voltage magnitude in 10 kV
ungrounded 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 ground fault current (A), Rf = 0 ohm
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 ground fault current (A), Rf = 0 ohm
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 ground fault current (A), Rf = 0 ohm
Residualvoltage(%)
Ungrounded
Rf=500ohm
Rf=2500ohm
Rf=5000ohm
Rf=10000ohm
Residualvoltage(%)
Residualvoltage(%)
GUID-2565F0BD-88F7-4678-87D8-40592E9D81BC V1 EN
Figure 189: Influence of fault resistance on the residual voltage magnitude in 15 kV
ungrounded 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.
1MAC059074-MB A Section 4
Protection functions
615 series ANSI 395
Technical Manual