This invention tracking arc-extinction compensation and select-switching device comprises: Z type grounding transformer connected to bus-bar, which neutral point being connected to one end of arc-extinction coil L1 by a single phase isolation switch, other end of L1 is grounding, said neutral point being connected to lightning protector and a single phase voltage inductance, the secondary wniding, by two ends, being paralleling respectively (1). compensated reactor branching which being composed of a compensated reactor and a silicon cotnrol series connected; (2). buffer resistance branching which being composed of series connected a buffer resistance and a silicon control, zero sequence current mutual inductor CT1-CT48 feedthrough connected to various out line of the sstem. The sampling signals and control signals is connected to controlling device. Advantages are: reliability, no need of filter.