In this paper

an universal formula for calculating the neutral line current imbalance protection and bridge differential current protection in large-capacity high voltage shunt capacitor bank with internal fuse and asymmetric wiring is introduced

which provides a simple method for the grassroots power sector. Throughout comparison of protection calculation of symmetrical and asymmetrical wiring bridge differential current

possibilities of adopting current protection calculation results with symmetrical wiring to replace asymmetrical wiring is analyzed. The imbalance protection error caused by the new calculation for shunt capacitors bank above 60 Mvar is less than 2%.