Page 853 - Industrial Power Engineering and Applications Handbook

System voltage regulation 24/807
400 kV line

Dedicated
400/33 kV& transformer
Y

7th
\
\ harmonic
\ \ filter
\ \
\ \
\ \
\
\ \
\ \ 10 MVAr
--
-
-
Filter circuits
-A
"
Range of compensation available
Capacitive : 0 to +140 MVAr
Inductive : 0 to -140 MVAr
- Load current - Illustration: = -190
Capacitive -+- lnductive
(a) When the TCR is ON, MVAr support
Now filter circuits would also be on to suppress
harmonics and absorb capacitive MVAr = +50
@ - Normal load line :. Net maximum reactive support available = -140 MVAr
@ - Load line on a disturbance (overloading) (b) When the TCR is OFF, TSC would supply
-
@I Corrected load line capacitive MVAr = +90
Note: Similarly, load lines can be drawn on a load rejection, or the The filter circuits would also supply
generator or the line outages. capacitive MVAr = +50
:. Net maximum reactive support available = +I40 MVAr
Figure 24.32 Voltage regulation during overloading through Figure 24.33 Typical SVC at 400 kV through a dedicated
reactive management transformer
Relevant Standards
IEC Title IS BS
60358/1990 Coupling capacitors and capacitor dividers 9348/1991 BS 757811992
605 19- 111984 Safety in electroheat installations 9080-1 to 4 BS EN 60519-111993
60694/1996 Common specifications for high voltage switchgear and 342711991 BS EN 60694/1997
controlgear standards
Relevant US standards ANSI/NEMA and IEEE

IEEE 824/1994 Standard for series capacitors in power systems
NEMA- Shunt capacitors, both LT and HT
CPU1992

Notes
1 In the tables of Relevant Standards in this book while the latest editions of the standards are provided, it is possible that revised editions
have become available. With the advances of technology and/or its application, the updating of standards is a continuous process by
different standards organizations. It is therefore advisable that for more authentic references, readers should consult the relevant
organizations for the latest version of a standard.
2 Some of the BS or IS standards mentioned against IEC may not be identical.
3 The year noted against each standard may also refer to the year of its last amendment and not necessarily the year of publication.