Designing at Very Low Temperature

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iochoa Member Join Date: Dec 2008 Posts: 7	Designing at Very Low Temperature 02/24/2012 10:02 AM
	I am designer of Electrical Substation system. Usually the Substations are designed at temperatures within the range of -30 to +40oC, but now I am working in Canada where I was told that the temperature is -50oC. In this condiiton the substation will requiere a special design with the consecuence that it will increase the cost. I did some research about the weather and I prepared a table where I can see that the temperature of -50oc is only 2 days or 3 days during the last 30 years, then I was wondering if I can use a statistic technique and the stress-strength analysis to get a resonable temperature value to use in my design. Could you please give me some addres about it. To be more specific, my question is: How Can I get that "reasonable temperature value"? How can I create a criteria to choose the "reasonable temperature value"? Thanks in advance. Best Regards, Ismael
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Usbport Guru Join Date: Apr 2010 Location: Trantor Posts: 5363 Good Answers: 647	#1 Re: Designing at Very Low Temperature 02/24/2012 10:13 AM
	Can you simply put temperature-controlled heaters on the critical components? There are companies that make these for the military where operations often must take place at Arctic -50C conditions. __________________ Whiskey, women -- and astrophysics. Because sometimes a problem can't be solved with just whiskey and women.
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lyn Guru Join Date: Oct 2008 Posts: 42355 Good Answers: 1693	#2 Re: Designing at Very Low Temperature 02/24/2012 10:23 AM
	First, someone in the company must have encountered these temperatures before. Ask them. Also Environment Canada should have historical records that will help you decide the level of protection you will need and a reasonable temperature value. You, and your customer will have to come to an agreement on the level of protection required and how to achieve it. Good luck.
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olehwi Power-User Join Date: Jun 2010 Location: Canada Posts: 139 Good Answers: 6	#3 Re: Designing at Very Low Temperature 02/24/2012 10:50 PM
	If you are »»designing at very low temperature««, like -50C, it is likely that your senses are no longer working, . . . you are frozen. I assume that you are »»designing for very low temperature«« applications. The -50C is in the standards, . . . and occurs only once every 20 years when the moon turns blue. And as it is in the standards - you have to design for it. If your equipment can not take it, . . . put a heater on it and keep it warm . . . O.
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jhhassociates Guru Join Date: Dec 2010 Location: North West England Posts: 1170 Good Answers: 153	#4 Re: Designing at Very Low Temperature 02/25/2012 5:14 AM
	All sub stations generate heat. Insulate the floor and building to a higher standard and worry about getting rid of the heat when it is warmer. That may be an easier problem to solve.
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Wal Guru Join Date: Jun 2011 Location: Phnom Penh Posts: 4019 Good Answers: 102	#5 Re: Designing at Very Low Temperature 02/25/2012 5:18 AM
	Heating because it's too cold? I battle with getting rid of the heat in my environment. Then there's the need to re-humidify chilled air to eliminate static charge buildup. Never ends. Microclimate engineering all the time. My feel on operating an electrical substation in a cold environment would have been that it would self heat but I'm probably wrong. Can you share some of the special considerations that low ambient temperatures introduce to the substation's design. Isn't colder generally better? Problems with cold gensets and the effects of cold on mechanical and structural elements I understand, but switchgear and transformers??.... Ready to learn. __________________ Difficulty is not an obstacle it is merely an attribute.
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