ABB RELION Series, Technical Manual

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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
Re
si
d
ua
l v
o
lt
ag
e
(%
)
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
Re
si
d
ua
l v
o
lt
ag
e
(%
)
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
Re
si
d
ua
l v
o
lt
ag
e
(%
)
Unearthed
Rf = 500 ohm
Rf = 2500 ohm
Rf = 5000 ohm
Rf = 10000 ohm
GUID-2F3654EF-9700-4FB7-B73C-85F7ED5D8EEF V1 EN
Figure 179: 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 90100
0
10
20
30
40
50
60
70
80
90
100
Total earth fault current (A), Rf = 0 ohm
R
es
id
ua
l v
ol
ta
ge
(%
)
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
R
es
id
ua
l v
ol
ta
ge
(%
)
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
R
es
id
ua
l v
ol
ta
ge
(%
)
Unearthed
Rf = 500 ohm
Rf = 2500 ohm
Rf = 5000 ohm
Rf = 10000 ohm
GUID-3880FB01-5C89-4E19-A529-805208382BB1 V1 EN
Figure 180: 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
R
es
id
ua
l v
ol
ta
ge
(%
)
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
R
es
id
ua
l v
ol
ta
ge
(%
)
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
R
es
id
ua
l v
ol
ta
ge
(%
)
Unearthed
Rf = 500 ohm
Rf = 2500 ohm
Rf = 5000 ohm
Rf = 10000 ohm
GUID-6321328D-6C17-4155-A2DF-7E1C47A44D53 V1 EN
Figure 181: 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.
1MRS758755 A
Section 4
Protection functions
REC615 and RER615 347
Technical Manual