Variable shunt reactor

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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[citation needed] Variable Shunt Reactors (VSR) have been developed and introduced on the market. The rating of a VSR can be changed in steps, The maximum regulation range are depending 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%, now up to 80% at some voltage levels[2]

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 securing voltage stability. Other important benefits are:

  • reduced voltage jumps resulting from switching in and out of traditional fixed reactors
  • flexibility for future (today unknown) load and generation patterns
  • improved interaction with other transmission equipment and/or systems such as coarse tuning of SVC equipment
  • limiting the foot print 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]

VSRs are considered[4] as technically advanced products and are mainly supplied by larger global manufacturers.

References[]

  1. ^ https://e-cigre.org/publication/655-technology-and-utilisation-of-oil-immersed-shunt-reactors
  2. ^ https://www.reinhausen.com/en/XparoDownload.ashx?raid=105171
  3. ^ https://search-ext.abb.com/library/Download.aspx?DocumentID=9AKK106930A7869&LanguageCode=en&DocumentPartId=&Action=Launch
  4. ^ https://e-cigre.org/publication/655-technology-and-utilisation-of-oil-immersed-shunt-reactors

External links[]

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