Metal-clad switchgear.

摘要

A metal-clad switchgear and a method of cooling the same with a plurality of radiation casings (11) as cooling units utilizing natural ventilation without any fan are disclosed. The cooling units arranged on the sides of the switchgear box (1) are formed as radiation casings (11) each having a plurality of removable intake holes (7) on the lower side of the front and rear parts and a plurality of removable exhaust holes (8) on the upper side thereof and first and second ventilation partition plates (9, 10) doubling as a receptacle for the dust intruding the radiation casings (11) with the width ( l 1) on the exhaust hole (8) side narrower than the width ( l 2) on the intake hole (7) side. The heat generated by the eddy current is reduced by a non-magnetic plate (12) arranged at appropriate position of the side plates. The air flow velocity in the radiation casings (11) is thus improved while at the same time facilitating the removal of the dust deposited within the radiation casings (11).