Single Phase Cycloconverter With Voltage Reduction

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prashanthng Associate Join Date: Sep 2008 Posts: 39 Good Answers: 1	Single Phase Cycloconverter With Voltage Reduction 07/04/2012 10:16 AM
	We have to design an UPS with Input is AC 230V, 1phase, 50 Hz. Output as 110V AC, 60 Hz. The output is catering to a load of 10 kVA. (18 Amp per workstation x 5 such workstations@ 110V) how can we equate the Input power with output power, even when there is change of frequency between output and input voltages. OR Is our sizing of 10 kVA of UPS is adequate? What shall be the size of Incoming breaker of UPS?
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lyn Guru Join Date: Oct 2008 Posts: 42355 Good Answers: 1693	#1 Re: single phase cycloconverter with voltage reduction 07/04/2012 10:27 AM
	Hire an electrical design engineer to do the work. (Or maybe a smart high school student) You must be in management.
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PWSlack Guru Join Date: Jan 2007 Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on. Posts: 32175 Good Answers: 839	#2 Re: single phase cycloconverter with voltage reduction 07/04/2012 10:34 AM
	A1: The output power divided by the input power is the efficiency. There will be a loss of power to effect the voltage and frequency conversions. A2a: With no diversity on the output, the UPS is going to be on the upper limit of its capabilities. A2b: The incoming breaker needs to be sized to handle a load larger than the maximum rating of the UPS, otherwise the breaker will trip before the UPS runs out of headroom, which will be a nuisance. Further, the incoming feed needs to cater for the situation where the UPS is re-charging as well as supplying the load, which makes the incoming feed somewhat bigger than 10kVA. Sizing of the breaker and the incoming cabling takes place according to the national wiring regulations in place in the country of installation; in the UK it's back to good old British Standard 7671 again. __________________ "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
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