Switchgear Room Temperature

The 10 c temperature increase assures air movement and in most cases prevents the switchgear from approaching the dew point.

Switchgear room temperature.

Temperature monitoring system into the medium voltage switchgear. 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. It is natural and valid requirement as the experience says one quarter of the switchgear failures is caused by loose joint or hot spot in the switchgear. Abb s white paper three keys to designing safe reliable and efficient substations for heavy industrial facilities switchboards and gas insulated switchgear have a short term maximum temperature of 40 c and a maximum value of 35 c for the 24h average.

What affects the operating temperature within lv switchgear photo credit. Outdoor thermally non insulated equipment is most susceptible to condensation. The good ventilation of switchgear and transformer rooms photo credit.