t [s] Operate time in seconds
U Measured voltage
U> Set value of
Start value
k Set value of
Time multiplier
Table 1654: 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 1MRS759142 F
1898 REX640
Technical Manual