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1. [Amps] Bleeder Resistor Inquiry (score: 1): Author: aborg <a_borg@yahoo.com>; Date: Sun, 24 Apr 2005 06:44:17 -0700 (PDT); I am currenty building a HV Power Supply using a 4800vac pole pig, 40uF 5kv oil filled cap , 10kv PIV rectifier board, 20 amp variac and a 100k 225watt bleeder. The initial power up started well with; /archives//html/Amps/2005-04/msg00472.html (6,850 bytes)
2. Re: [Amps] Bleeder Resistor Inquiry (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Sun, 24 Apr 2005 16:04:21 +0200; Expect a 225W resistor dissipating 160W to become quite hot... On a more serious turn, good engineering practice has been to overrate any bleeder with a safety factor of 4. The current 100 k bleeder; /archives//html/Amps/2005-04/msg00473.html (10,197 bytes)
3. Re: [Amps] Bleeder Resistor Inquiry (score: 1): Author: "Joe Subich, K4IK" <k4ik@subich.com>; Date: Sun, 24 Apr 2005 10:23:43 -0400; Mike, Your bleeder resistor is too small. 4000 volt transformer with fullwave bridge should produce at least 5600 volts no load. 5600 volts across 100K -> 56 ma 56 ma * 56 ma * 100K = 313.6 watts 313; /archives//html/Amps/2005-04/msg00474.html (9,025 bytes)
4. Re: [Amps] Bleeder Resistor Inquiry (score: 1): Author: David Kirkby <david.kirkby@onetel.net>; Date: Sun, 24 Apr 2005 15:28:26 +0100; I guess it is not sufficiently heatsinked, but you seem to have very little safety margin on what is an important component. I would tend to allow a much greater safety margin than you are. That 225W; /archives//html/Amps/2005-04/msg00475.html (9,286 bytes)
5. Re: [Amps] Bleeder Resistor Inquiry (score: 1): Author: aborg <a_borg@yahoo.com>; Date: Sun, 24 Apr 2005 07:28:51 -0700 (PDT); Joe, Mike-KK4MS a_borg@yahoo.com __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com _______________; /archives//html/Amps/2005-04/msg00476.html (9,949 bytes)
6. Re: [Amps] Bleeder Resistor Inquiry (score: 1): Author: TexasRF@aol.com; Date: Sun, 24 Apr 2005 11:21:30 EDT; Much more can be said about the voltage rating of these power resistors. The failure mode resulting from over voltage operation is an open turn (and there are a bunch of turns, increasing the probabi; /archives//html/Amps/2005-04/msg00478.html (8,273 bytes)
7. Re: [Amps] Bleeder Resistor Inquiry (score: 1): Author: "Will Matney" <craxd1@ezwv.com>; Date: Sun, 24 Apr 2005 11:57:11 -0400; Mike, The resistors model number shows a 225-watt core, 4595 volts. Joe showed that the watt rating was too small as the voltage and current you have will multiply to more than 225, or 314 watts. You; /archives//html/Amps/2005-04/msg00479.html (13,240 bytes)
8. Re: [Amps] Bleeder Resistor Inquiry (score: 1): Author: "Will Matney" <craxd1@ezwv.com>; Date: Sun, 24 Apr 2005 12:23:01 -0400; Henry, You think I might be shell shocked? I don't know why anymore, but that loud crack just makes me jump out of my skin. The only thing I can think of is just hearing it so many times. Funny thing; /archives//html/Amps/2005-04/msg00481.html (9,279 bytes)
9. Re: [Amps] Bleeder Resistor Inquiry (score: 1): Author: "David C. Hallam" <dhallam@rapidsys.com>; Date: Sun, 24 Apr 2005 12:24:09 -0400; If I read Mike's original post correctly, he stated that he held the voltage to 4KV with his variac. Therefore, he should have had 40 mA draw by the bleeder resistor which is equal to 160W dissipatio; /archives//html/Amps/2005-04/msg00482.html (9,900 bytes)
10. Re: [Amps] Bleeder Resistor Inquiry (score: 1): Author: "Will Matney" <craxd1@ezwv.com>; Date: Sun, 24 Apr 2005 12:33:41 -0400; David, I did'nt catch the piece about a variac as I seen the one from Joe. Well, it's according the the maximum open circuit voltage, across how many ohms, at how much current, to determine the watta; /archives//html/Amps/2005-04/msg00483.html (11,062 bytes)
11. Re: [Amps] Bleeder Resistor Inquiry (score: 1): Author: R@contesting.com;Measures <r@somis.org>; Date: Sun, 24 Apr 2005 10:28:23 -0700; With finer Ni-Cr wire, more turns, and more V, perhaps a turn to turn arc burns the wire open? Indeed, Gerald. I do not trust higher-value WW resistors at their published V-rating. Rich Measures, 805; /archives//html/Amps/2005-04/msg00485.html (8,856 bytes)
12. Re: [Amps] Bleeder Resistor Inquiry (score: 1): Author: "Steve Thompson" <g8gsq@ic24.net>; Date: Sun, 24 Apr 2005 18:51:45 +0100; I've not looked for the data, but is the 225W rating with forced air cooling as opposed to natural convection? Steve _______________________________________________ Amps mailing list Amps@contesting.; /archives//html/Amps/2005-04/msg00486.html (8,572 bytes)
13. Re: [Amps] Bleeder Resistor Inquiry (score: 1): Author: "Phil Clements" <philc@texascellnet.com>; Date: Sun, 24 Apr 2005 14:39:32 -0500; Your bleeder is too small. All you need a bleeder for on a C input filter P.S. is to drain the HV after shut-down. Your 100,000 ohm resistor is flowing 160 ma of current, and just heating itself, you; /archives//html/Amps/2005-04/msg00491.html (10,176 bytes)
14. Re: [Amps] Bleeder Resistor Inquiry (score: 1): Author: aborg <a_borg@yahoo.com>; Date: Wed, 27 Apr 2005 11:11:14 -0700 (PDT); Mike-KK4MS a_borg@yahoo.com __________________________________ Do you Yahoo!? Yahoo! Small Business - Try our new resources site! http://smallbusiness.yahoo.com/resources/ ___________________________; /archives//html/Amps/2005-04/msg00578.html (10,992 bytes)
15. Re: [Amps] Bleeder Resistor Inquiry (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Wed, 27 Apr 2005 14:26:01 -0400; Believe or not Resistors have a voltage limit and rating. The standard 2 watt carbon film resistor is only rated for 300 or 400 volts DC. They can be pushed higher but not by a lot. The same is true; /archives//html/Amps/2005-04/msg00580.html (12,202 bytes)
16. Re: [Amps] Bleeder Resistor Inquiry (score: 1): Author: aborg <a_borg@yahoo.com>; Date: Wed, 27 Apr 2005 14:06:43 -0700 (PDT); Mike-KK4MS a_borg@yahoo.com __________________________________ Do you Yahoo!? Yahoo! Small Business - Try our new resources site! http://smallbusiness.yahoo.com/resources/ ___________________________; /archives//html/Amps/2005-04/msg00581.html (12,425 bytes)
17. Re: [Amps] Bleeder Resistor Inquiry (score: 1): Author: "Steve Thompson" <g8gsq@ic24.net>; Date: Thu, 28 Apr 2005 07:49:07 +0100; But 4000^2/2000000 = 8W 10 x 2W still won't have enough safety margin though, and voltage rating will be a problem. Steve _______________________________________________ Amps mailing list Amps@contes; /archives//html/Amps/2005-04/msg00592.html (8,126 bytes)
18. Re: [Amps] Bleeder Resistor Inquiry (score: 1): Author: "Steve Thompson" <g8gsq@ic24.net>; Date: Thu, 28 Apr 2005 07:58:49 +0100; Sorry! Getting two trains of thought mixed up, and it's early in the morning. Please ignore that one. 0.5W resistors with 3500V dc rating are readily available and cheap - maybe not well suited to th; /archives//html/Amps/2005-04/msg00593.html (8,602 bytes)
19. Re: [Amps] Bleeder Resistor Inquiry (score: 1): Author: "Will Matney" <craxd1@ezwv.com>; Date: Thu, 28 Apr 2005 06:24:06 -0400; See below; ** REPLY SEPARATOR ** It's the same method used to determine the breakdown voltage in the windings of a transformer. As, there's so many volts per layer of winding. The difference between; /archives//html/Amps/2005-04/msg00594.html (14,350 bytes)
20. Re: [Amps] Bleeder Resistor Inquiry (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Thu, 28 Apr 2005 11:16:49 -0400; High voltage,high resistance film resistors are still made the same way, with a spiral element to maximize the element's lenght. _______________________________________________ Amps mailing list Amps; /archives//html/Amps/2005-04/msg00599.html (15,730 bytes)

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