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  • Users: sabrepoint
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  1. sabrepoint

    Bending of beam subject to offset transverse force

    Sorry if this is too basic but I'm unsure re this and haven't found similar on Web ... Formula to determine moment at R? Thanks from an electrical
  2. sabrepoint

    Metal Halide lamp in-rush current

    Hi I'm no lighting engineer so please bear with me. I need to calculate the cable voltage drop during start and operating conditions of the Ruud CF3499 flood light fitted with 1000 W 240 V MH lamps. I was under the impression that any light fitted with a choke would have a large in-rush...
  3. sabrepoint

    Overhead SWER Lines

    Hello In New Zealand we have quite a lot of SWER (single-wire earth return) line in various remote areas. In fact I think a NZ power board engineer developed the concept in the 1930s. As far as I know it’s all 11 kV line-to-ground. Under the old regulations such a system was limited to 8 A...
  4. sabrepoint

    Math question - weighted average

    Hi All Not really electrical engineering, but I'm trying to apply formula to engineering problem ... The following formula determines the Weighted Average Life (Lavg) of a group of power poles ... Lavg = Qconc/Qtot * 60 + (Qtot-Qconc)/Qtot * 45 where Qconc is quantity of concrete poles, Qtot...
  5. sabrepoint

    Bending Moment

    Hi ... sorry this is so simple for you lot but I never did well at mechanics and it was sooo long ago. 1) I know if I plant a 5 meter high post in concrete and apply a 1 kN horizontal force at the pole tip, the pole moment is 5 kNm. That's easy enough, but what if I weld a right-angled fitting...
  6. sabrepoint

    Power line sag/tension calcs

    Hello All From time to time I have done calcs to determine the changes in conductor tension under differing wind loads and temperatures. But for a new job I'm starting, I need to consider the effects on sag and tension when lines are subjected to radial ice, of which I have no experience (I...
  7. sabrepoint

    High Voltage Insulator (power line) drawings

    Hello all Would anyone known of a source where I can obtain 2D dwgs of 110/132 kV porcelain and/or polymer post insulators? DXF OK. Also lower voltage around 50/66 kV and 11 kV would be helpful. Even attached to structures. Manufacturers' data I've seen to date are raster or photos which isn't...
  8. sabrepoint

    AutoCAD Insulator dwgs

    Hello again Would anyone known of a source where I can obtain 2D dwgs of 110/132 kV porcelain and/or polymer post insulators? DXF OK. Also lower voltage around 50/66 kV and 11 kV would be helpful. Even attached to structures. Manufacturers' data I've seen to date is raster or photos which isn't...
  9. sabrepoint

    110 kV poled line tips

    Hi All I've some experience in 11 and 33 kV feeder design but not much on 110 kV, so I would appreciate any advice on a number of issues. I'm to assist in the survey and design of a single-cct 110 kV line to be erected some 70 km across a mix of steep hill country (mainly clear), winding road...
  10. sabrepoint

    negative and zero sequence resistance

    Hi All On HV overhead line and underground cabling systems, how do the negative and zero sequence RESISTANCES differ from the positive. Can they be assumed to be similar? I don't have a problem with the reactances ... just need to know more re the resistances. Any help anyone? Thanks Graeme

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