[Boatanchors] AC Line Voltage Regulation

[Ron]

Have you considered a motor driven Variac?

-- Ron



>________________________________
> From: Jerry <jsternmd at att.net>
>To: 'jmfranke' <jmfranke at cox.net>; jfor at quikus.com 
>Cc: boatanchors at mailman.qth.net 
>Sent: Sunday, November 18, 2012 3:23 PM
>Subject: [Boatanchors] AC Line Voltage Regulation
> 
>I changed the subject title as it may have been misleading.  I live in a
>rural part of Connecticut and my line voltage varies from 114 vac on some
>days to 129 vac on others ... it is fairly steady on any particular day.  I
>have used my heavy duty Variacs but would prefer something that doesn't need
>daily adjustments.  Complaining to the power company has not helped.
>
>Someone mentioned that the BAMA article was thyristor-based not just a
>bucking xfrmr and offered some regulation besides reduction.  I was thinking
>of an AC constant 115 vac regulator system capable of handling several of my
>boatanchors (eg 10A) using TRIAC's but I have read that the output waveform
>is distorted, maybe MOSFETs and SPWM?   Has anyone needed or bothered to go
>to such an elaborate setup?
>
>TIA, 
>Jerry
>K1JOS
>
>
>-----Original Message-----
>From: jmfranke [mailto:jmfranke at cox.net] 
>Sent: Sunday, November 18, 2012 10:24 AM
>To: jfor at quikus.com; Jerry
>Cc: boatanchors at mailman.qth.net
>Subject: Re: [Boatanchors] BAMA Voltage Reducer Article
>
>Yes, this will work, but for reducing the voltage it is better to put the
>secondary in series with the primary. The phasing of the secondary is
>selected to reduce the voltage across the primary. What is being done is the
>secondary winding is being added to the turns in the primary winding. The
>supply neutral is connected the free end of the primary and the supply line
>is connected to the free end of the secondary. The output neutral is
>connected to the input neutral and the output line is connected to the tap
>between the primary and secondary. The reduces the voltage across the
>primary which reduces the transformer losses. Too many transformers are
>designed with the input voltage getting close to core saturation and the
>method suggested in the BAMA article puts the higher line voltage across the
>primary, which pushes the transformer even closer to saturation.
>
>John  WA4WDL
>--------------------------------------------------
>From: "J. Forster" <jfor at quikus.com>
>Sent: Sunday, November 18, 2012 10:07 AM
>To: "Jerry" <jsternmd at att.net>
>Cc: <boatanchors at mailman.qth.net>
>Subject: Re: [Boatanchors] BAMA Voltage Reducer Article
>
>> Just wire up a 6 or 12 volt filament transformer to buck the line.
>>
>> Primary goes across line and neutral; secondary goes in series with 
>> hot side between line and load, phased to reduce line voltage; 
>> secondary amp capacity must be > load current.
>>
>> Done,
>>
>> -John
>>
>> ===============
>>
>>
>>> A while ago the BAMA list had a nice article on building a voltage 
>>> reducer to drop modern line voltage back t0o 110-115 vac.  BAMA 
>>> mirror site Edebris does not have the article.  If someone has a copy 
>>> can they email to me at jsternmd {at} att {dot} net
>>>
>>> Thanks
>>>
>>> Jerry
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