Reactive power automatic compensation device is directly related to the reliable operation of power system

study of problems arising during automatic compensation period has important significance to system optimization.In this paper

the abnormal operating condition in the system is subject to model simplification and data analysis after installation of reactive power automatic compensation device

and such conclusion that when the on-load tap-changing transformer is at parallel operation in different tap positions

the circulating current generated can effect power factor measurement at low voltage side are made.And according to the procedure

the relevant operation suggestions are proposed.