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线路调压器-1
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Step voltage regulator

6.35kV…19.05kV…33kV, 50A…300A…640A

The RVR type feeder automatic voltage regulator is actually a single phase oil immersed auto-transformer with RWK controller and gathering sampling of voltage &current signal, on load tap charger controlling device to achieve gird more efficient from adjust the load character by increase and decrease the voltage. 
So This RVR is a transformer equipped with on load tap charger with RWK controller sampling voltage and current data and on load tap charger steps from current transformer and voltage transformer and limit switches.