Transformers in Series

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mathewkyle Power-User Join Date: Aug 2010 Location: Omni-present via the internet! Posts: 122	Transformers in Series 08/20/2010 3:47 PM
	Hello everyone, I have a scenario: I have an equipment rated 120V. It uses a stepdown (120/24V) transformer to generate a 24V AC that is later rectified to 24V DC. Total load is rated 65W. However, I have only a 240V supply available. I am unable to replace the step down transformer with one for 240/24V. So I decided to install another step down transformer for 240/120V (which can supply a maximum load of 100W) whose 120V output is the input to the 120/24V transformer. Please help me figure out the total load. Will it be (65W+losses for the new trnsfrmr), or it is something like (65+65=130W!!)? What is the correct (or closest approximation) total system load? ie. what is the total power consumption for transformers in series? __________________ Never stop asking questions.
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Del the cat Guru Join Date: May 2007 Location: Harlow England Posts: 16510 Good Answers: 669	#1 Re: Transformers in series 08/20/2010 4:43 PM
	65W+losses for the new trnsfrmr... Next! Del __________________ health warning: These posts may contain traces of nut.
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mathewkyle Power-User Join Date: Aug 2010 Location: Omni-present via the internet! Posts: 122	#2 In reply to #1 Re: Transformers in series 08/21/2010 4:17 AM
	Hi, Thanks for that. Now,to make it more interesting: if the 120/24V transformer can operate at 65 W maximum, does that mean I am wasting (unusable) 35W capacity by using a 100W 240/120V transformer? __________________ Never stop asking questions.
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Del the cat Guru Join Date: May 2007 Location: Harlow England Posts: 16510 Good Answers: 669	#3 In reply to #2 Re: Transformers in series 08/21/2010 4:39 AM
	You seem to be under the impression that you are entertaining us. Not so... The Power rating of a transformer is the amount of power it can deliver, not the ammount it consumes, it's as simple as that. You could drive your Ipod from a 10w transformer in series with a 25w transformer, in series with a 50w transformer, in series with a 100w transformer, in series with a 100MW hyrdo electric plant, it would alter the amout of power the Ipod consumed. OK you'd looses a fair bit in quiescent current at each transformer. If you have a genuine question that isn't homework, then we love to help, or if you have a "challenge question" or puzzle, fine, but let us know what it is. Del __________________ health warning: These posts may contain traces of nut.
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mathewkyle Power-User Join Date: Aug 2010 Location: Omni-present via the internet! Posts: 122	#4 In reply to #3 Re: Transformers in series 08/21/2010 5:34 AM
	Hi there, Thanks for the prompt replies. Sorry about my choice of words, if it was a bit flowery. I just wanted to explore a new possibility, not practically do it! It is neither a challenge, puzzle or homework, just ideas and shared thoughts. Thanks __________________ Never stop asking questions.
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Del the cat Guru Join Date: May 2007 Location: Harlow England Posts: 16510 Good Answers: 669	#5 In reply to #4 Re: Transformers in series 08/21/2010 7:52 AM
	Aw ignore me. I just a grumpy old Cat Del __________________ health warning: These posts may contain traces of nut.
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mathewkyle Power-User Join Date: Aug 2010 Location: Omni-present via the internet! Posts: 122	#6 In reply to #5 Re: Transformers in series 08/22/2010 3:03 AM
	Ha ha ha, got you Del the Cat! Have a good day. __________________ Never stop asking questions.
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Del the cat Guru Join Date: May 2007 Location: Harlow England Posts: 16510 Good Answers: 669	#7 In reply to #6 Re: Transformers in series 08/22/2010 3:06 AM
	I think not... you'll find we have you...if you look around you'll see the exits are blocked. You're ours now <cackles wildly> Del __________________ health warning: These posts may contain traces of nut.
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