3 phase load requrements

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dhanking23 Active Contributor Join Date: Nov 2010 Posts: 21	3 phase load requrements 01/26/2011 9:08 AM
	if the measured values for line to line voltage and line curent is 230V and 250 amps.. what should be the minimum and maximum range so i can tell that it is a balance 3 phase load.. i need a websites or source that will check this range..thx
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JRaef Guru Join Date: Sep 2006 Location: California, USA, where the Godless live next door to God. Posts: 4665 Good Answers: 804	#1 Re: 3 phase load requrements 01/26/2011 10:43 AM
	"Balanced" would be 230-230-230 and 250-250-250 respectively. Anything outside of that is unbalanced. Maybe what you meant is "What is an acceptable level of voltage and current imbalance" and the answer to that is... it depends. Different types of loads can tolerate different amounts of imbalance. As a general rule though, motors want to see no more than a 5% voltage imbalance but must be de-rated starting at just 1%. Resistive heaters on the other had couldn't care less. Different power utilities have different tolerances they consider acceptable, they are the best place to start, then look at what the equipment you are using can tolerate before deciding what to do about it. Link regarding motors __________________ All I every really wanted to be, was... A LUMBERJACK!.
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msamad Guru Join Date: Feb 2009 Location: Houston, USA Posts: 946 Good Answers: 244	#4 In reply to #1 Re: 3 phase load requrements 01/26/2011 10:12 PM
	It is good answer. These threads and the reference links also may help: http://cr4.globalspec.com/thread/50564/Motor-Current http://cr4.globalspec.com/thread/54906/Acceptable-Voltage-Unbalance-in-Transformer-Secondary-While-Primary-Constant - MS __________________ "All my technical advices in this forum must be consulted with and approved by a local registered professional engineer before implementation" - Mohammed Samad (Linkedin Profile: http://www.linkedin.com/in/msamad)
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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: 3 phase load requrements 01/26/2011 12:21 PM
	Why does it need to be balanced? Isn't that what the neutral conductor is for? __________________ "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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TonyS Guru Join Date: Aug 2010 Location: Resting under the Major Oak Posts: 4347 Good Answers: 181	#3 Re: 3 phase load requrements 01/26/2011 7:26 PM
	"i need a websites or source that will check this range" Try finding a website on Google __________________ The reports of my death are greatly exaggerated.
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