A capacitance-adjustable arc suppression coil is designed based on TMS320F2812 regulated controlled-silicon switching capacitors for the 2.2 kV·A/220 V capacity-adjustable arc suppression coil and 2 kvar capacitance regulating cabinet

and experimental verification is carried out in laboratory.The working principle and the hardware and software design scheme of the coil are illustrated.The result suggests that the capacitance-adjustable automatically tracking arc-suppression compensation device can realize on-line measurement of capacitive current of power grid.Its functions

such as automatic recognition of operating condition of power gird and complete compensation for earthing capacitive current

fulfill the qualifications for automatic compensation of power grid capacitive current.Furthermore

a 2 kvar capacitance regulating cabinet is designed based on bidirectional controlled-silicon switching capacitor.Moreover

a human-computer interface for displaying real-time parameters of LCD128×64 module is designed.The real compensation currents of the arc suppression coil at all levels are obtained experimentally

and are compared with the theoretical ones with an error analysis.The proposed arc-suppression compensation device has the merits of rapid tuning

wide range

high reliability and no harmonic pollution.