In this paper

the calculation formula for capacity of capacitor to be installed for the need of reactive power compensation at load 380 V and 10 kV is listed

the active load power factor increased from cosφ 1 to cosφ 2 per kW is given.When rated voltage of capacitor and of load is 380 V or 10 kV the calculation coefficient（compensation rate） of the needed capacitors capacity is given.It is stressed in the paper that when rated voltage of selected capacitor is higher than the network voltage

the needed compensation capacitor’s capacity obtained by calculation should be multiplied by the coefficient of square ratio of voltage

and the factor of capacity increase of capacitor by series reactors should be considered

so as to the rated capacity of selected capacitor by calculation can meet the expected compensation result at actual operation voltage of 38 kV or 10 kV.In the attachment table of the paper

the large number of combination data are provided by the authors and the suggestions on combination of different capacity of single capacitor are proposed

which provides convenience in design and drawing review

achieves fine tuning switching of capacitor and keeps power factor operate at defined settings.