As for such issues as surplus of capacitive reactive power in present urban distribution network after the midnight and higher overvoltage generated by the power network under the single phase grounding

a kind of Y-reactor arcing device is designed. First

its structure and operating principle are introduced

then

the overvoltage of power network after connection of compensation elements with different capacitance with neutral point of Y-reactor

at last

connection of arc suppression coil and Y-reactor to the power network is simulated by Matlab. It is shown by the theoretical calculation and simulation results that after connection of Y-reactor in the power network the overvoltage

in case of single phase grounding

is suppressed and normal condition can be recovered. Y-reactor can not only decrease the grounding capacitive current so as to make arc extinguish easier

but also can solve such issue as surplus of capacitive reactive power after midnight and reduction of overvoltage due to single phase grounding. It can replace the arc suppression coil to solve the problems such as overvoltage and capacitive reactive power compensation.