In this paper

the capacitor capacity formula for resonance in GB50227 Design specification on shunt capacitor is mainly analyzed. The capacitor capacity formula is derived on the basis of shunt resonance analysis

and three cases for existence of the formula at different conditions are proposed. But it is thought that the formula for shunt resonance capacitor given in the two national standards shall be used under limited condition in terms of a practical engineering application

specification normalization and safe operation in power system. The cautions for formula recommended by the authors are described in the application

and the formula is illustrated by cases with purpose of providing reference for those who are in the reactive compensation design and who are formulating the standards.