DC oil discharging protecting device and method for transformer substation

The invention discloses a DC oil discharging protecting device and method for a transformer substation. The device comprises a sucker which is arranged at an oil discharging hole in the bottom part of an oil tank of a transformer; an annular electromagnet is arranged below the sucker; a through hole is arranged in the bottom part of the sucker; a sleeve is arranged on the sucker and fixedly connected and communicated with the sucker through the through hole in the bottom part of the sucker; a bolt dismounting mechanism is arranged in the sleeve, and the bolt dismounting mechanism comprises a sliding rod, a bolt sleeve head and a bolt dismounting mechanism body, wherein the sliding rod is positioned in the center of the sleeve, and the cross section of the sliding rod is of a square structure; the bolt sleeve head is arranged at the upper end part of the sliding rod; the bolt dismounting mechanism is arranged at the lower part of the sleeve and connected with the sliding rod; a positioning guide sleeve sleeves the sliding rod and is fixed to the sleeve through a plurality of fixing rods; the bolt dismounting mechanism body comprises an electromagnetic sleeve and a magnetic pushing rod, wherein the electromagnetic sleeve is fixed into the sleeve through a connecting rod; the magnetic pushing rod is positioned in the electromagnetic sleeve, corresponding to the lower end of the sliding rod, wherein the magnetic pushing rod is also connected with the bottom part of the electromagnetic sleeve through a spring.