COOLING STRUCTURE OF BOARD

To simplify a cooling structure of a board while obtaining an electric shock suppression property of a board, without using a non-conducting material.SOLUTION: A pair of suppressing rails 4a and 4b is provided so as to be extended to an in/out direction (hereinafter, simply referred to a device in/out direction) of a stationary induction apparatus 2 on a board bottom part 12 side in a board main body 1. Also, a protection cover 6 is provided so as to be interposed between the stationary induction apparatus 2 and a board front face part 11a in a state where the stationary induction apparatus 2 is housed in the board main body 1 to divide the board main body 1 into a suction port side space part 71 and a space part 72 on the stationary induction apparatus side. In the board front face part 11a, a suction port communicated with the suction port side space part 71 is provided. In a board ceiling part 32, an exhaust port 32 communicated with the space part 72 on the stationary induction apparatus side is provided. On an outer side face of a closing lid 8 closing an upper side of a track space part 83 as between supporting rails 4a and 4b, a suction port side penetration hole 81 and a penetration hole 82 on the stationary induction apparatus side are provided so as to be communicated with track space part 83.SELECTED DRAWING: Figure 3 【課題】非導電性材料を用いなくても盤の感電抑制性が得られ、盤の冷却構造を簡略化する。【解決手段】盤本体１内の盤底部１２側において静止誘導機器２の出し入れ方向（以下、単に機器出入方向と適宜称する）に延在するように一対の支持レール４ａ，４ｂを設ける。また、盤本体１内に静止誘導機器２が収容されている状態で当該静止誘導機器２と盤正面部１１ａとの間に介在するように保護カバー６を設け、当該盤本体１内を吸気口側空間部７１と静止誘導機器側空間部７２とに区分する。また、盤正面部１１ａにおいて、吸気口側空間部７１と連通する吸気口を設け、盤天井部３２において、静止誘導機器側空間部７２と連通する排気口３２を設ける。また、支持レール４ａ，４ｂ間である軌間空間部８３の上方側を塞ぐ閉塞蓋８外側面に、当該軌道空間部８３と連通するように吸気口側貫通孔８１および静止誘導機器側貫通孔８２を設ける。【選択図】図３