Switchgear Room Temperature

If switchroom or plant room ambients are typically considered to be up to 25 c this relates to a 25 30k rise above ambient.

Switchgear room temperature.

Dust content may also be set. I suppose the other point for consideration is why are we running the switchgear at 70 let alone 90 and what assessment is the designer making for the limiting capacity of this temperature on the protective devive most of the current ratings are actually declared for 50c from memory so you should derate say a 100a deviceto perhaps 90 ish amps if its operating at 70c and perhaps even. Limit values for humidity and air quality e g. In order to design a good ventilation of switchgear and transformer rooms the air in the room must meet various requirements.

The high humidity level in a switchgear room causes several damaging effects. As an illustration the diagram below shows simple room layout consisting of a 22 kv switchboard some dc and scada panels click for a larger image. It results in condensation of moisture on the switchgear surfaces when there is a sudden change in temperature because of outside weather or inside air conditioning factors. Switchgear heat emissions and temperature rise is something of a snake and mongoose affair between switchgear manufacturers and designers clients a small dx split aircon unit often serves to eliminate any unseemly arguments after the fact regards oms let the wind blow you across a big floor.

Each switchroom is unique and needs to be considered in relation to the specific equipment which will be installed. The condensed moisture on the switchgear surface is detrimental to switchgear. Design criteria for room ventilation.