Surge Protection Circuit

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harjeetsinghengg Commentator Join Date: Jul 2008 Posts: 56 Good Answers: 1	Surge Protection Circuit 01/04/2012 7:35 AM
	As shown above we have Eddy current dynamometer, its 3 windings are in series parallel to surge protection circuit (combination of resistance and surge suppression diodes. 1) How reliable is parallel safety circuit, since under normal condition the safety circuit is open circuit. If it does not work or circuit wire is open somewhere. it means my equipment is still parallel to abnormal supply. 2) How to test the safety circuit. 3) Magnetic poles (South/north) shown above are correct for given winding connection. or to maintain the same magnetic poles sequence I need to swap the middle winding over its terminals.
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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	#1 Re: Surge Protection Circuit 01/04/2012 7:52 AM
	<...How reliable is parallel safety circuit...> Is it a proprietary item or is it home-brew? If it is proprietary, contact the manufacturer directly. If it is home-brew, then contact either the circuit designer or the circuit user. <...How to test the safety circuit...> Show it something with which it is designed to operate, and check that it does what it is designed to do. __________________ "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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NotUrOrdinaryJoe Guru Join Date: Apr 2008 Location: Lexington, KY Posts: 1639 Good Answers: 73	#2 Re: Surge Protection Circuit 01/04/2012 8:52 AM
	Go to www.eaton.com and select power quality under products and services. Better yet, arrange to visit their lab and learn more in a few hours than you would typically get in an entire semester of college. Obviously I was impressed with their knowledge and set up. __________________ A great troubleshooting tip...."When you eliminate the impossible, whatever remains, however improbable, must be the truth." Sir Arthur Conan Doyle
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PMoon Power-User Join Date: Feb 2010 Location: Florida Posts: 259 Good Answers: 29	#3 Re: Surge Protection Circuit 01/04/2012 10:51 AM
	The DC power supply is "regulated" which means it is providing clean DC power to your coils regardless of line voltage. The surge suppression system (safety circuit) is really there to protect the power supply from the reverse (kickback) voltage that occurs when the magnetic field in the coils collapses. The diode(s) are connected in parallel with the DC supply, cathode to positive, anode to negative. When the magnetic field in the coils collapses, the reverse polarity kickback voltage is bled off through the diode to ground. If you need to reverse the poles on one of the coils (for whatever reason), make sure the kickback protection diodes are connected as described, or you may wipe out an expensive power supply. __________________ Si vis pacem, para bellum
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harjeetsinghengg Commentator Join Date: Jul 2008 Posts: 56 Good Answers: 1	#4 Re: Surge Protection Circuit 01/05/2012 5:02 AM
	@ PMoon .. the safety circuit is in parallel to the coils even though if it is there for kickback reasone how it will work in peresent connection scheme, how voltage is bled off through the diode to ground?
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