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Recent content by Dan76

  1. Dan76

    Is there such a thing as an inexpensive megger?

    Check Graingers www.grainger.com. A quick check under megohmmeters and I found some for around $100. I'm sure other supply houses have similar prices. These are for simple 500 Volts DC meggars, which should be fine as long as you are dealing with ordinary low voltage (600 volts and below)...
  2. Dan76

    General Circuit Troubleshooting

    1:"When troubleshooting an electrical circuit are there some general rules of how to proceed:" Simple stuff: ALWAYS CHECK SIMPLE STUFF FIRST! -Power supply; Is the circuit getting power? (This includes external things like cords, plugs, outlets, fuses, and breakers) -Obvious problems...
  3. Dan76

    Dateline's treatment of TMI

    (un?)Fortunately I missed it, sadly since most journalists have little to no scientific or technical training this kind of crap will continue to pop up from time to time, (after all, it sells soap.) The really scary part is most people buy this fertilizer, hook, line, and sinker, then they...
  4. Dan76

    X-ray from lightning

    Yes, the High Voltage discharge probably generates x-rays. No, the x-rays are probably not dangerous as long as you are far enough away. If you are too close to the lightning strike x-rays are the least of your worries. Radiation Field decreases as the square of distance (I realize this is a...
  5. Dan76

    accidents or incidents regarding nuclear powered naval vessels

    tstead, elguapo is correct, there are some things we can't discuss. Core design, and specific #'s, being a few. If you want to find out more check out these websites: http://www.iss.external.lmco.com/kapl/ http://www.bettis.gov/ I dont believe they contain very detailed technical info but...
  6. Dan76

    Alarm system for 480V ungrounded systems

    jburn, your system sounds alot like the electrical system of a Navy ship, 480V Delta Ungrounded. We had ground detectors, one type was "Active" and used 500VDC to test basically an installed meggar you could use on hot cables. It gave oyu a value but didn't tell you which phase. The...
  7. Dan76

    Surplus supply of large motors

    Correction to my last: Use www.drms.dla.mil Sorry for any confusion. -Dan76
  8. Dan76

    Residental metering

    don01 gets my vote for best application of the K.I.S.S. concept. (Keep It Simple Silly, NOT the Band.) Plus everyone should have a friendly sparky mate! Knowing a good welder and machinist helps too. -Dan76
  9. Dan76

    condensers

    Sar1281, there are a few solutions I can offer based upon my experience with Marine (ie. Shipboard) condensers. 1:Locate your intakes lower in the water, temperature drops the deeper you go. 2:Increase cooling flow through the condenser, this will lower your outlet temp, and therefore the...
  10. Dan76

    Generator Output vs. Power Factor.

    I think the confusion here lies in the difference between Real and Reactive power. Real Power: Does work or Makes Heat (kW) Reactive Power: Energy stored in Electric and Magnetic Fields (KVAR) +/- 90* from Real Power Apparent Power: Vector Sum of Real+Reactive Power This is why a Generator puts...
  11. Dan76

    Surplus supply of large motors

    Try www.drms.gov for gov't surplus Use FSC (Federal Stock Code) 6105 The site is a P.I.T.A.! to use but you might get a good price Good Luck, -Dan76
  12. Dan76

    Gas Turbine Generator Operation

    A little more info would help Define "Remote" Control, is it from a building 100m away, or from 200km away? Does the client want full time condition monitoring and control or "start/stop, on/off" type control? How much "Automatic" operation is desired? You might...
  13. Dan76

    Fine adjustment screw

    Try www.micromark.com It's a hobby supply store, but they do sell little brass machine screws (Plus they have other cool stuff like minature lathes, and drill presses, the catalog is free)
  14. Dan76

    de-Gaussing magnetic pipe prior to welding

    Try coiling insulated wire around the pipe, continuously until the needed length is covered plus a little extra (I would use 2 pipe diameters on each end, with a minimum of 6 inches <15 cm>) Pass a DC current through the coil, then halve the value of current and reverse the polarity, repeat this...
  15. Dan76

    Odd distribution voltage

    Sounds like 3:2 stepdown transformer is what you need Maybe a 3:1 stepdown wired as a buck(opposing voltage)autotransformer, an appropriately sized unit that transforms 12.5 kV to 4160 should work wired to 208/120. The High Voltage unit might be expensive but maybe you can find one surplus...
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