Figure 1013: Operate time curve based on IDMT characteristic with Minimum
operate time set to 1 second
11.3.1.1 Standard inverse-time characteristics for overvoltage protection
The operate times for the standard overvoltage IDMT curves are defined with the
coefficients A, B, C, D and E.
The inverse operate time can be calculated with the formula:
t s
k A
B
U U
U
C
D
E
=
⋅
×
− >
>
−
+
(Equation 399)
1MRS759142 F
General function block features
REX640
Technical Manual
1897
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