Schweitzer Engineering Laboratories SEL-300G - Page 93

Relay Element Settings 2-3
SEL-300G Instruction Manual Date Code 20020206
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Time in Seconds
Time in Cycles 60 Hz (50Hz)
6000 (5000)
3000 (2500)
1500 (1250)
600 (500)
300 (250)
150 (125)
60 (50)
30 (25)
15 (12.5)
6 (5)
3 (2.5)
DWG: M300G197
Multiples of Pickup
0.50
1.00
2.00
3.00
4.00
5.00
6.00
8.00
10.00
12.00
15.00
Figure 2.31: U.S. Short-Time Inverse
Curve: U5
0.05
0.10
0.20
0.30
0.40
0.50
0.60
0.70
0.80
0.90
1.00
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Time in
Seconds
Time in Cycles 60 Hz
(50Hz)
6000 (5000)
3000 (2500)
1500 (1250)
600 (500)
300 (250)
150 (125)
60 (50)
30 (25)
15 (12.5)
6 (5)
3 (2.5)
DW G: M 300G115
Multiples of
Pickup
Figure 2.32: I.E.C. Class A Curve (Standard
Inverse): C1
0.05
0.10
0.20
0.30
0.40
0.50
0.60
0.70
0.80
0.90
1.00
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90
100
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.01
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.04
.05
.06
.07
.08
.09
100
123456789.5 .6 .7 .8.9
90 80 70 60 50 40 30 20 10
Time in
Seconds
Time in Cycles 60 Hz
(50Hz)
6000 (5000)
3000 (2500)
1500 (1250)
600 (500)
300 (250)
150 (125)
60 (50)
30 (25)
15 (12.5)
6 (5)
3 (2.5)
DWG: M300 G117
Multiples of
Pickup
Figure 2.33: I.E.C. Class B Curve (Very
Inverse): C2
0.05
0.10
0.20
0.30
0.40
0.50
0.60
0.70
0.80
0.90
1.00
10
20
30
40
50
60
70
80
90
100
1
2
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5
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9
.1
.2
.3
.4
.5
.6
.7
.8
.9
.01
.02
.03
.04
.05
.06
.07
.08
.09
100
123456789.5 .6 .7 .8 .9
90 80 70 60 50 40 30 20 10
Time in
Seconds
Time in Cycles 60 Hz
(50Hz)
6000 (5000)
3000 (2500)
1500 (1250)
600 (500)
300 (250)
150 (125)
60 (50)
30 (25)
15 (12.5)
6 (5)
3 (2.5)
DW G: M3 00G118
Multiples of
Pickup
Figure 2.34: I.E.C. Class C Curve
(Extremely Inverse): C3