Section 11
1MAC050144-MB C
General function block features
666
615 series ANSI
Technical Manual
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:
(Equation 85)
t [s] trip time in seconds
V
measured voltage
V>
the set value of
Pickup value
k
the set value of
Time multiplier
Table 543: 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
t s
k A
B
V V
V
C
D
E
⎡
⎣⎢
⎤
⎦⎥
=
⋅
× − >
>
−
⎛
⎝⎜
⎞
⎠⎟
+
Содержание 615 Series ANSI
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