Schweitzer Engineering Laboratories SEL-387E - Page 102

3-54 Protection Functions Date Code 20080110
SEL-387E Instruction Manual
Figure 3.28: U.S. Short-Time Inverse Curve:
U5
Figure 3.29: I.E.C. Class A Curve
(Standard Inverse): C1
Figure 3.30: I.E.C. Class B Curve
(Very Inverse): C2
Figure 3.31: I.E.C. Class C Curve
(Extremely Inverse): C3