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 (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,[2] from 50%, now up to 80% at some voltage levels.[3] VSRs are considered[4] as 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 securing voltage stability. Other important benefits are:

  • reduced voltage jumps resulting from switching in and out of traditional fixed shunt 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[5]

References
  1. "Technology and utilisation of oil-immersed shunt reactors".
  2. "Technology and utilisation of oil-immersed shunt reactors".
  3. https://www.reinhausen.com/en/XparoDownload.ashx?raid=105171
  4. "Technology and utilisation of oil-immersed shunt reactors".
  5. https://search-ext.abb.com/library/Download.aspx?DocumentID=9AKK106930A7869&LanguageCode=en&DocumentPartId=&Action=Launch
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