![background image](http://html.mh-extra.com/html/abb/relion-615-series/relion-615-series_technical-manual_23951120.webp)
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
Содержание Relion 615 series
Страница 1: ... RELION PROTECTION AND CONTROL 615 series ANSI Technical Manual ...
Страница 2: ......
Страница 39: ...Section 17 Glossary 1181 Table of contents 615 series ANSI 33 Technical Manual ...
Страница 40: ...34 ...
Страница 64: ...58 ...
Страница 210: ...3 19 4 Settings Section 3 1MAC059074 MB A Basic functions 204 615 series ANSI Technical Manual ...
Страница 216: ...210 ...
Страница 884: ...878 ...
Страница 1038: ...1032 ...
Страница 1136: ...1130 ...
Страница 1172: ...1166 ...
Страница 1180: ...1174 ...
Страница 1186: ...1180 ...
Страница 1192: ...1186 ...
Страница 1193: ...1187 ...
Страница 1194: ......
Страница 1195: ......