11.3.1.1 Standard inverse-time characteristics for overvoltage protection
The trip times for the standard overvoltage IDMT curves are defined with the coefficients
A, B, C, D and E.
The inverse trip time can be calculated with the formula:
t s
k A
B
V V
V
C
D
E
=
⋅
×
− >
>
−
+
GUID-6E9DC0FE-7457-4317-9480-8CCC6D63AB35-ANSI V1 EN (Equation 179)
t [s]
trip time in seconds
V measured voltage
V> the set value of
Pickup value
k the set value of
Time multiplier
Table 946: 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
Section 11 1MAC059074-MB A
General function block features
1114 615 series ANSI
Technical Manual
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