4.25
Date Code 20170927 Instruction Manual SEL-751 Relay
Protection and Logic Functions
Group Settings (SET Command)
Figure 4.14 U.S. Short-Time Inverse Curve: U5 Figure 4.15 IEC Class A Curve (Standard Inverse): C1
Figure 4.16 IEC Class B Curve (Very Inverse): C2 Figure 4.17 IEC Class C Curve (Extremely Inverse): C3
0.50
1.00
2.00
6.00
3.00
4.00
5.00
10.00
8.00
12.00
15.00
.01
.5 .6 .7 .8 1.9
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80
9
2
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5
6
7
8
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20
30
40
50
60
70
90
100
Time in Seconds
Multiples of Pickup
Time in Cycles 60 Hz (50Hz)
3 (2.5)
6 (5)
15 (12.5)
60 (50)
30 (25)
150 (125)
300 (250)
1500 (1250)
600 (500)
3000 (2500)
6000 (5000)
0.60
0.05
0.50
0.40
0.30
0.20
0.10
1.00
0.90
0.80
0.70
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.5 .6 .7 .8 .9 1
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80
10
2
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6
4
5
7
9
8
20
50
30
40
60
70
100
90
Time in Seconds
Multiples of Pickup
Time in Cycles 60 Hz (50Hz)
3 (2.5)
6 (5)
15 (12.5)
30 (25)
60 (50)
600 (500)
150 (125)
300 (250)
1500 (1250)
3000 (2500)
6000 (5000)
0.30
0.20
0.10
0.05
1.00
0.90
0.80
0.70
0.60
0.50
0.40
.01
.5 .6 .7 .8 .9 1
.02
.03
.04
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.07
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423 56789
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80
10
2
3
6
4
5
7
9
8
20
50
30
40
60
70
100
90
Time in Seconds
Multiples of Pickup
Time in Cycles 60 Hz (50Hz)
3 (2.5)
6 (5)
15 (12.5)
30 (25)
60 (50)
600 (500)
150 (125)
300 (250)
1500 (1250)
3000 (2500)
6000 (5000)
.01
.5 .6 .7 .8 .9 1
.02
.03
.04
.05
.09
.07
.06
.08
.1
.2
.3
.4
.5
.7
.6
.9
.8
1
423 56789
10
40
20
30
70
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60
80
90
100
80
10
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20
50
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60
70
100
90
0.20
0.10
0.05
1.00
0.90
0.80
0.70
0.60
0.50
0.40
0.30
Time in Seconds
Multiples of Pickup
Time in Cycles 60 Hz (50Hz)
3 (2.5)
6 (5)
15 (12.5)
30 (25)
60 (50)
600 (500)
150 (125)
300 (250)
1500 (1250)
3000 (2500)
6000 (5000)
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