4.44
SEL-787 Relay Instruction Manual Date Code 20150130
Protection and Logic Functions
Basic Protection
Figure 4.25 U.S. Moderately Inverse Curve: U1 Figure 4.26 U.S. Inverse Curve: U2
Figure 4.27 U.S. Very Inverse Curve: U3 Figure 4.28 U.S. Extremely Inverse Curve: U4
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Time in Seconds
Multi
les of Picku
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)
0.50
6.00
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Time in Seconds
Multi
les of Picku
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)
12.00
1.00
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10.00
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6.00
5.00
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70
100
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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)
3.00
2.00
1.00
0.50
15.00
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10.00
8.00
6.00
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10
2
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5
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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)
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