The utility model relates to an electric power system mechanical manufacturing technology field, specifically speaking is an electric energy improvement device case is imitated entirely to low pressure, be equipped with the box, divide into the integrated chamber of right side cable to the box and the chamber is placed to left side instrument electric capacity through the baffle, the integrated chamber of right side cable and left side instrument electric capacity are placed and are equipped with the operation mouth on the box of both sides around the chamber respectively, be connected with the chamber door that is greater than the operation mouth through articulated connecting piece on the box of operation adorae, the operation is equipped with outstanding and the edge sealed laminating of chamber door on mouthful, be equipped with seal rubber strip on the edge, seal rubber strip seals the laminating with the medial surface of chamber door, the right side top of box is equipped with cable import and air exhauster, the left surface below is equipped with cable outlet and the import of latticed convulsions, baffle below in the box is equipped with the wind direction through the mouth, in the latticed convulsions import inspiration box left side of wind direction by box left surface below, again by wind direction below the right flank baffle through a mouthful getting into the right side, finally by right flank top air exhauster discharge. The utility model has the advantages of the maintenance is simple and convenient, the leakproofness is high, the configuration is reasonable.