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SVR automatic step voltage regulator automatically adjust the gear of on-load tap changer according to the condition of circuit voltage to realize the change of transformer ratio,so as to ensure that the output voltage is stable in a certain range.It can be widely used in power supply circuit with long distance of power supply,large power supply load,large voltage fluctuation and power quality can’t meet the usage standard.It can also be used in industrial and mining enterprises whose voltage quality can’t meet the production needs.The product has obtained national patent,the patent No.is ZL2010205818.4