Shunt reactor can compensate capacitive charing current of line, and decrease the power frequency voltage rising caused by capacitance effeci of liaht load or no-load in lona distance ransmission ine, improve the line distibution and reactive power distribuion,and reduce he power line loss; reduce the secondary arc curent, accelerate the exinguishing of secondan arc improve the success ale of ine auto reclosina. hus ensure the sleadv operation of transmission and distribution line.