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Recent content by jimbofitz

  1. jimbofitz

    Fukushima No. 1 loss of coolant due to earthquake

    Does the nuclear industry (especially in Japan) use robots for inspections in high radiation areas or to move radioactive material around? I, for some reason assumed that robotics could be involved to limit human interaction with radioactive material. Could they send something in to get a...
  2. jimbofitz

    Motor Varnish / Epoxy Suggestions

    Google Elantis or Von Roll. They make complete lines of resins for all transformer/motor applications. They also have application notes regarding the general use of their products.
  3. jimbofitz

    Transformer Inrush

    GadreP, Inrush will be approximately 10-12 times the FULL LOAD CURRENT for a standard transformer.
  4. jimbofitz

    Heat sink interface material

    I have seen ceramics used in this application for both dielectric properties and heatsinking capability. If the ceramic substrate is metallized with copper/nickel on both sides it can be soldered to eliminate the epoxy problem. I don't have any exact details but I believe this method is...
  5. jimbofitz

    AIC RATING

    I believe UL 489 is for circuit breakers.
  6. jimbofitz

    How difficult is it to get a component UL listed?

    Thanks for your prompt replies! The product of interest is for a 600V class, 100-300 kVA 3-phase inductor family. I don't think we will be using any plugs, but that reminds me that all components within our assembly should be UL listed @ jraef Does all testing typically take place at a UL...
  7. jimbofitz

    How difficult is it to get a component UL listed?

    My employer is interested in finding out how to get a component listed as UL & CSA 508 compliant. We are not familiar in any capacity with the requirements or process to achieve this type certification. We have some opportunities in the motor drive market but don't know what kind of issues...
  8. jimbofitz

    Function/usefullness of transfomer interleaving shield?

    Do you specify a shielding ratio? Some end-users like to filter out swtiching and other HF noise through a shield.
  9. jimbofitz

    We found a "working" motor generator in the factory...

    I completely agree the regulator might not have much life in it. If it only requires man-power and some resistors/wiring to be in working order we might have them in our stock room from vintage products (our company makes transformers as well as power supplies dating back to the 30's). I'm...
  10. jimbofitz

    We found a "working" motor generator in the factory...

    My main concern is that we will damage the regulator while replacing wires and resistive elements. The insulation is all cracked and some of the wires are even fraying. I don't even want to touch the reed switches. It sounds like it would be wise to clean everything up and stick with the...
  11. jimbofitz

    We found a "working" motor generator in the factory...

    Additional Photo's http://files.engineering.com/getfile.aspx?folder=9db616dd-970e-4408-882c-c2d4f72bf22f&file=IMG_0030.jpg http://files.engineering.com/getfile.aspx?folder=95b61070-de05-4da1-82a3-4f0ea94f6919&file=IMG_0026.jpg...
  12. jimbofitz

    We found a "working" motor generator in the factory...

    One of our guys found a 5 kva 480V/60Hz to 115V/400Hz generator in a loft and decided to energize it after at least 15 years. To our amazement it fired up and supplied voltage on the output. The motor is a Delco model B-612A, 7.5HP. The generator is a Bogue Electric Mfg. Co. Model 2082...
  13. jimbofitz

    IEEE Free E-Book for Professional Members Who Renewed for 2010 ?

    Pete, You're welcome. I also doubt I'll be trying to get my hands on them.
  14. jimbofitz

    IEEE Free E-Book for Professional Members Who Renewed for 2010 ?

    Here is a clip from the email I received this week. Hope it helps. Regards, Jim http://files.engineering.com/getfile.aspx?folder=75c7c94f-90eb-4b2e-9475-087de4c0ce02&file=IEEE_Ebook.jpg
  15. jimbofitz

    problem with pt100 signal on generator

    We have had problems at our facility with thermocouples having bad readings in a high magnetic field. It was assumed that the magnetic field was inducing voltage into the sensor that swamped out the low level signal generated by the element. The sensor was placed next to the core gap of a...

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