The development trend of power primary equipment is to be miniaturization

integration and multi-function

because it can not only save the construction area

but also reduce the cost of operation and maintenance.The integrated transformer is designed according to the similar working characteristics of the electromagnetic voltage transformer and the transformer.Firstly

the work magnetic density is changed in order to increase the output power of the voltage transformer.Then

subsection compensation is installed at the secondary winding of the voltage transformer for control the output voltage range.The subsection compensation can meet the function of tap-changer.Finally

in order to reduce the error problem which is caused by the high work magnetic density

error compensation is made on the secondary winding of the voltage transformer with voltage induction principle and phase shift technology.The verification test shows that the rate of change of the output voltage of the integrated transformer less than 3% by capacity compensation when the load changes from 60 kVA to 0.In addition

the voltage transformer error can meet requirement of the accuracy level 0.2.