| 摘要 |
<p>The invention comprises a method for treating air in a closed air transport system in a series of electric switchgear cubicles (1a-1d), placed side-by-side and closed to the ambient air, by means of at least one air treatment unit (2) common to the cubicles. The method for air treatment comprises passing cleaned, pressurized, possibly also cooled and/or dried air, from an air treatment unit (2) via a common channel (3) and further via parallel branch pipes (4a-4d) with pressure regulating devices (5a-5d) for regulating the air flow, directly to each individual switchgear cubicle, these switchgear cubicles being adapted to receive the treated air, distribute the air for cooling purposes over electric equipment present in the cubicles, the distributed air being adapted to be collected and returned, via connections (6a-6d) arranged between the cubicles, to the air treatment unit (2) where an extra intake (8) for ambient air is adapted to supply extra air to the air transport system in order to create an overpressure in the system while at the same time replacing an air loss caused by a leakage flow of air out of the cubicle series. The direction of the air flow through the system may be reversed.</p> |
