Schweitzer Engineering Laboratories SEL-300G - Page 92

2-2 Relay Element Settings
Date Code 20020206 SEL-300G Instruction Manual
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Time in Seconds
Time in Cycles 60 Hz (50 Hz)
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: M300G097
Multiples of Pickup
Figure 2.27: U.S. Moderately Inverse
Curve: U1
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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: M300G098
Multiples of
Pickup
100
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Figure 2.28: U.S. Inverse Curve: U2
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100
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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: M300 G10 0
Multiples of
Pickup
Figure 2.29: U.S. Very Inverse Curve: U3
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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: M300G101
Multiples of
Pickup
Figure 2.30: U.S. Extremely Inverse
Curve: U4