Larry,
Yes, it very well could as the 4-5 seconds was a guess for the longest time.
The reason, a ham on this mailer ran a test and sent me the results from a
logging oscilloscope which showed the inrush current spike of a HV transformer
at power up. I lost this by the way in this last computer crash, and would
like to get those results back. It showed it took about 25-26 cycles for the
transformer to settle down. The first 5-6 cycles were the worst. Since yours is
at 1/2 second, it very well could be ok. At the time, we were discussing using
a saturable reactor to control inrush current.
Best,
Will
*********** REPLY SEPARATOR ***********
On 8/12/05 at 9:27 AM Larry Carman wrote:
>The Henry RF generator using a 4 KW power supply at 4000 VDC and a filter
>choke
>only use a .5 second soft start. The 1/2 second delay seems to be plenty
>even
>with 30 mf of caps and no filter choke. I've been running this arrangement
>or years. Too much soft start in certain instances will cause the bypass
>relays
>to energize too slow and cause relay clattering amongst other problems.
>
>Regards,
>Larry N5BIP
>
>-----Original Message-----
>From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com]On
>Behalf Of Will Matney
>Sent: Tuesday, August 09, 2005 11:30 AM
>To: amps@contesting.com
>Subject: Re: [Amps] Sort Start
>
>
>You can add a soft start, some do and some don't. A 10 second delay though
>is a little too long for the soft start on the HV transformer. You only
>need
>about 4 to 5 seconds as that's actually over the time it takes for the
>transformer to settle down. Some circuits are a little faster than that.
>
>Best,
>
>Will
>
>*********** REPLY SEPARATOR ***********
>
>On 8/9/05 at 11:15 AM Rich wrote:
>
>>Gentleman, I have started bread boarding my power supply. So far I have
>>it set for the filament transformer and fan to come on first, run for 3
>>( adjustable ) min then kick in a relay for 0 to280v to the HV trans , I
>>have a 50ohm 100 watt resistor in line for 10 sec then full voltage (as
>>set by the autotransformer) to the HV transformer.
>>The caps bank will be 33uF at 6000vdc ( 3 caps 100mF 2000vdc each ),
>>transformer will be set 3000 to 40000vdc.
>>Before I bolt it all down and hard wire it do I need a soft start for
>>the filament?
>>The tube is a 4-1000a
>>
>>Rich , kd0zz
>>
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>
>
>
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