Transformers in power distribution network are usually scattered

resulting in difficult voltage regulation and poor voltage stability.To solve this problem

a system which can automatically adjust the voltage output of the distribution transformer was designed in this study.In this technique

thyristors are substituted for mechanical switch

and the embedded control technology is employed to automatically adjust the output voltage in situ under load condition with the monitored transformer secondary voltage as the reference by way of switching the high-voltage side tap winding

hence the stability of the power distribution network can be enhanced.In addition

on the basis of the existing no-contact on-load tap-changer analysis

the regulator circuit topology was improved

a closing protection scheme was designed

and the voltage detection and winding switching algorithm was optimized.Thereby

the manufacturing cost of the system get lower

and the system becomes more reliable and stable.The prototype of the designed automatic voltage regulation system was tested to verify its effectiveness.