December 2012
Beginner
528 pages
17h 31m
English
Content preview from Introduction to Electrical Power and Power Electronics
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226 Introduction to Electrical Power and Power Electronics
Current (multiples of rated value)
0.001
100
0.10
0.010
10
1.0
2046810
Clearing time (seconds)
Fast-acting fuse
Standard fuse
Time-delay fuse
FIGURE 9.4 Fault current versus clearing time for three types of fuse (average values).
Ambient temperature
% of Nominal rating
–50
80
60
100
40
120
025 –2550 75 100°C
Standard and fast-acting fuses
Time-delay fuse
–58
32
77
–13
122
167
212°F
FIGURE 9.5 Derating and uprating factors for fuse versus operating ambient temperature.
227System Protection
Example 9.1
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