Process and device for the explosion-protected operation of electrical equipment

摘要

Method for an explosion-proof operation of electrical equipment which is arranged in a housing (10), with the following step: a) Supplying the housing (10) with a first gas that is pressurized relative to the environment, in particular compressed air, to prevent the penetration of an ignitable second To prevent gas from entering the housing (10) in order to protect the electrical equipment from explosions during operation; characterized by the following further steps: b) taking up and storing the first gas under excess pressure in a storage device (20), the storage device (20) being pneumatically connected to the housing (10) by means of closure devices (40) in such a way that the first gas can take place between the storage device (20) and the housing (10) when the closure devices (40) are open; c) allowing switching and / or electrical switching on of the electrical operating means in the housing (10) by means of a pressure monitoring switching device (60 ), if the pressure of the first gas within the housing (10) is above a predetermined first threshold value, and not allowing switching and / or electrical switching off of the electrical equipment in the housing (10) by means of the pressure monitoring switching device (60), if the Pressure of the first gas within the housing (10) below the predetermined first threshold value d) permanent closing of the closure devices (40) when the pressure of the first gas within the housing (10) falls below the predetermined first threshold value and / or the pressure of the first gas within the storage device (20) falls below a predetermined second threshold value, so that the first gas can no longer be exchanged between the storage device (20) and the housing (10), the closure devices (40) being designed in such a way that they remain closed when the pressure of the first gas within the storage device (20) then rises again above the predetermined second threshold value; e) detecting whether an ignitable second gas has penetrated the housing (10) when the pressure of the first gas within the housing (10) has fallen below the predetermined first threshold value; f) with following further steps if it is established in the step of detection that an ignitable second gas is in the housing e (10) has penetrated: f1) flushing the housing (10) with a flushing medium in order to remove the ignitable second gas from the housing (10), and f2) releasing the closure devices (40) so that they open again with it an exchange of the first gas between the storage device (20) and the housing (10) can take place again if, following the step of flushing the housing (10) with the flushing medium, when the step of detection is carried out again, it is determined that no there is more ignitable second gas in the housing (10); g) or with the following further step if it is determined in the step of detection that no ignitable second gas has penetrated into the housing (10): g) releasing the closure devices ( 40) so that they open again so that an exchange of the first gas between the storage device (20) and the housing (10) can take place again.