9.13
Date Code 20080213
Instruction Manual
SEL-351A Relay
Setting the Relay
Time-Overcurrent Curves
Figure 9.8
I.E.C. Class C Curve (Extremely Inverse): C3
.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
4
2
3
5
6 7 8 9
10
40
20
30
70
50
60
80
90 100
80
10
2
3
6
4
5
7
9
8
20
50
30
40
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)
Summary of Contents for SEL-351A
Page 10: ...This page intentionally left blank Courtesy of NationalSwitchgear com ...
Page 16: ...This page intentionally left blank Courtesy of NationalSwitchgear com ...
Page 34: ...This page intentionally left blank Courtesy of NationalSwitchgear com ...
Page 126: ...This page intentionally left blank Courtesy of NationalSwitchgear com ...
Page 184: ...This page intentionally left blank Courtesy of NationalSwitchgear com ...
Page 198: ...This page intentionally left blank Courtesy of NationalSwitchgear com ...
Page 228: ...This page intentionally left blank Courtesy of NationalSwitchgear com ...
Page 278: ...This page intentionally left blank Courtesy of NationalSwitchgear com ...
Page 384: ...This page intentionally left blank Courtesy of NationalSwitchgear com ...
Page 410: ...This page intentionally left blank Courtesy of NationalSwitchgear com ...
Page 450: ...This page intentionally left blank Courtesy of NationalSwitchgear com ...
Page 454: ...This page intentionally left blank Courtesy of NationalSwitchgear com ...
Page 472: ...This page intentionally left blank Courtesy of NationalSwitchgear com ...
Page 504: ...This page intentionally left blank Courtesy of NationalSwitchgear com ...
Page 558: ...This page intentionally left blank Courtesy of NationalSwitchgear com ...
Page 562: ...This page intentionally left blank Courtesy of NationalSwitchgear com ...
Page 586: ...This page intentionally left blank Courtesy of NationalSwitchgear com ...
Page 608: ...This page intentionally left blank Courtesy of NationalSwitchgear com ...
Page 666: ...This page intentionally left blank Courtesy of NationalSwitchgear com ...