| 词条 | Variable shunt reactor |
| 释义 |
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{{cn|date=December 2011}} 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 typically is a factor of two, e.g. from 100-200 Mvar. The regulation speed is normally in the order seconds per step and around a minute from max to min rating. VSRs are today available for voltages up to 550 kV. The largest three-phase VSRs in operation have a rating of 120-200 Mvar at 420 kV and single-phase variable shunt reactors banks rated 200-285 Mvar at 420 kV have been installed in Italy. 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:
VSRs are considered{{by whom|date=February 2012}} as technically advanced products and are mainly supplied by larger global manufacturers such as ABB and Siemens. ReferencesExternal links
1 : Electric power transmission |
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