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6 F 2 S 0 7 5 8
Fuse
GRD140
Figure 2.1.7
Feeder Protection Coordinated with Fuses
Configuring the inverse time element OC1 (and EF1) and time graded elements OC2 and OC3 (or
EF2 and EF3) as shown in Figure 2.1.8, the characteristic of overcurrent protection can be
improved to coordinate with the fuse characteristic.
Time (s)
OC1
OC2
OC3
Fuse
Current (amps)
Figure 2.1.8
Staged Definite Time Protection
⎯
⎯
16
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