To understand and estimate the unit capacity cost of reactor with coupling coil（RCC）

the electromagnetism structure of the reactor must be determined.This paper studied the design parameter and criteria of the reactor based on its characteristics.The layout and structure of the cored windings are decided with careful comparison and analysis.The parameters of iron core and the turns are decided on the basis of the main reactance requirements;the current density and structure of the coil are worked out through repetitive adjustment and calculation;the leakage reactance

consumable and consumption

and temperature rise are all calculated in this paper.It is found that when the technical features and consumption index are satisfied

the iron and copper consumption per unit capacity of RCC are lower than that of the shunt reactor with iron core with the same capacity.They occupy the same space

while the former is a little higher.