Engineering:Variable shunt reactor
Variable shunt reactors are used in high voltage energy transmission systems to stabilize the voltage during load variations. A traditional shunt reactor has a fixed rating and is either connected to the power line all the time or switched in and out depending on the load. Recently [1] variable shunt reactors (VSRs) have been developed and introduced on the market. The rating of a VSR can be changed in steps: the maximum regulation range depends on the capability of the on-load tap changer used in combination with the regulation winding used for the shunt reactor. The maximum regulation range has increased over the years,[1] from 50%, up to 80% at some voltage levels.[2] VSRs are considered[1] technically advanced products and are mainly supplied by larger global manufacturers.
Advantages
The variability brings several benefits compared to a traditional fixed shunt reactors. The VSR can continuously compensate reactive power as the load varies and thereby stabilise the voltage. Other important benefits are:
- reduced voltage jumps resulting from switching in and out a traditional fixed shunt reactor
- flexibility for future variation in load and generation patterns
- improved interaction with other transmission equipment and systems such as coarse tuning of SVC equipment
- limiting the footprint of a substation: if parallel, fixed shunt reactors can be replaced with one VSR
- a VSR can be used as a flexible spare unit and be moved to other locations in the power grid if needed
- mitigation of zero-miss phenomenon, while energisation of long power lines and cables[3]
References
- ↑ Jump up to: 1.0 1.1 1.2 "Technology and utilisation of oil-immersed shunt reactors". 2016. https://e-cigre.org/publication/655-technology-and-utilisation-of-oil-immersed-shunt-reactors.
- ↑ "(Variable) Shunt Reactor". https://www.entsoe.eu/Technopedia/techsheets/variable-shunt-reactor.
- ↑ "Hitachi Energy Publisher". https://search-ext.abb.com/library/Download.aspx?DocumentID=9AKK106930A7869&LanguageCode=en&DocumentPartId=&Action=Launch.
External links
- http://www05.abb.com/global/scot/scot252.nsf/veritydisplay/dadf3c1d27681cc48525775400608bb5/$file/1zse954001-21_vsr_pamphlet.pdf
- http://www.getra.it/default.php?mcat=azi&cod=casehistory&scod=casepower&id=320
- http://www.swedishneutral.se/main.php?name=shunt_reactor
![]() | Original source: https://en.wikipedia.org/wiki/Variable shunt reactor.
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