![background image](http://html.mh-extra.com/html/abb/relion-615-series/relion-615-series_technical-manual_2395524.webp)
GUID-46FDF23A-7E78-4B17-A888-8501484AB57A V1 EN
Figure 259:
Protection of the power transformer feeding the frequency converter
Transforming ratio correction of CTs
The CT secondary currents often differ from the rated current at the rated load of the power
transformer. The CT transforming ratios can be corrected on both sides of the power
transformer with the
CT ratio Cor Wnd 1
and
CT ration Cor Wnd 2
settings.
First, the rated load of the power transformer must be calculated on both sides when the
apparent power and phase-to-phase voltage are known.
I
S
V
nT
n
n
=
×
3
GUID-B5467DB8-17EB-4D09-A741-1F5BB23466AA-ANSI V1 EN
(Equation 89)
I
nT
rated load of the power transformer
S
n
rated power of the power transformer
V
n
rated phase-to-phase voltage
Section 4
1MAC059074-MB A
Protection functions
518
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: ......