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t [s]
operate time in seconds
U
measured voltage
U>
the set value of
Start value
k
the set value of
Time multiplier
Table 730: Curve coefficients for the standard overvoltage IDMT curves
Curve name
A
B
C
D
E
(17) Inverse Curve A 1
1
0
0
1
(18) Inverse Curve B 480
32
0.5
0.035
2
(19) Inverse Curve C 480
32
0.5
0.035
3
General function block features
1MRS758755 C
818
REC615 & RER615
Technical Manual