Re: High-currrent resistors and inductors 1/27/03
What we have found to work well is a combination of a resistor bank of open
helical resistors which we purchase from Post Glover (www.postglover.com).
Typically the total resistance is approximately 30 ohms which can be tapped
off in 1 ohm steps to form various series parallel combinations. We then have
air core inductors custom wound with multiple taps to allow for adjustment of
the power factor. I would expect that most transformer companies can wind this
type of inductor for you. If you have any further questions feel free to
contact me at my email address below.
John
Lou Aiken wrote:
>
>This sounds like something that won't be found on the shelf.
>
>I have seen some small AC welding machines where the output current was
>adjustable by increasing and decreasing an adjustable air gap designed into
>the magnetic path of the flux cutting the output winding. The flux path in
>the primary remains unchanged. They make a H of a noise under load. I have
>not the slightest idea how much the scheme would or could change the phase
>angle but of course it did.
>
>So, I would ask manufactures of small AC welding machines if they would be
>willing to eliminate the input circuit and furnish such a regulating
>component..
>
>
>Lou Aiken, LaMer LLC
>27109 Palmetto Drive
>Orange Beach, AL
>36561 USA
>
>tel ++ 1 251 981 6786
>fax ++ 1 251 981 3054
>Cell ++ 1 251 979 4648
>----- Original Message -----
>From: John Woodgate <j...@jmwa.demon.co.uk>
>To: <emc-p...@majordomo.ieee.org>
>Sent: Monday, January 27, 2003 7:56 AM
>Subject: High-currrent resistors and inductors - preferably variable
>
>
>>
>> One of my IEC colleagues, from a very large company, sent this enquiry:
>>
>> I am interested in locating
>> suppliers that can provide variable impedance elements (Ztest < Zref)
>> needed to test to EN 61000-3-11. The range of Ztest, at 50 Hz, may have
>> to be Ztest = (0.10 - 0.25) + j(0.10 - 0.25) with 75 A per phase.
>> I have located one supplier in the US, with a possible additional one
>> that may be acceptable.
>> I would like to have a European source if possible. Any information that
>> you can provided in this regard will be greatly appreciated.
>>
>> Either send me e-mail or put a message here.
>> My e-mail is jmw(AT)jmwa.demon.co.[DELETE.]uk
>> --
>> Regards, John Woodgate, OOO - Own Opinions Only.
>http://www.jmwa.demon.co.uk
>> Interested in professional sound reinforcement and distribution? Then go
>to
>> http://www.isce.org.uk
>> PLEASE do NOT copy news posts to me by E-MAIL!
>>
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>-------------------------------------------
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John Lach
Manager Standards and Test
john.l...@carlingtech.com
Carling Technologies
60 Johnson Ave.
Plainville, CT 06062
860-793-7167
www.carlingtech.com
