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Recent content by ergon

  1. ergon

    Mid span clearance between earthwire and conductor

    The geometry of the earthwire and phases at the structure are determined from lightning investigations. Minimum phase to ground clearances must be satisfied at the structure. Generally the earthwire is sagged less than the conductor. This means that the shielding angle (when positive) at...
  2. ergon

    conductor corrosion measuring

    In 1989 a UK based company Cormon marketed an overhead conductor corrosion detector, the OHLCD 200. It consisted of a radio controlled trolley. At that time an outage was required to use the device, except in the case of the earthwire. More than likely improvements have been made since that time.
  3. ergon

    Quick way of deleting alternate rows

    If the order of data is important then philruh may want to add another column B filled with sequential integers. Sort by column A (1 2 1 2 ... )then by column B (1 2 3 4 ...) to preserve the original order. Then delete the 2's.
  4. ergon

    Motor Start Voltage Drop re. Transformer Loading

    Consideration should be given to flicker problem when starting this motor. Refer to IEC 61000-3-5 TR2 Ed. 1.0 b (1994) : Electromagnetic compatibility (EMC) - Part 3: Limits - Section 5: Limitation of voltage fluctuations and flicker in low-voltage power supply systems for equipment with rated...
  5. ergon

    conductor creep

    Basically there are three sources of strain. Thermal, elastic and plastic (metallurgical creep and strand settling). It is a common practice to convert long term creep into an equivalent value of thermal strain (called the creep compensation temperature). When sagging the conductor, the creep...
  6. ergon

    Uplift capacity of inclined plate anchors

    I wish to locate a copy of the following reference in English - Meyerhof, G.G. (1973) "Uplift resistance of inclined anchors and piles" Proc., VIII Intl. Conf. Soil Mech. Found. Engineering, Moscow, USSR, 2.1 pp 167-172
  7. ergon

    Design Of Steel Lattice SS & Guyed Towers

    Power Line Systems have excellent analysis software for towers, poles, guyed masts, caissons. http://www.powline.com/products.html
  8. ergon

    Guy tensions

    Could someone explain the acronym TIA/EIA-222-F "Structural Standards for Steel Antenna Towers and Antenna Supporting Structures" and where I can obtain a copy. It is not available from Amazon.com. I am interested in their calculation of guy tension using a tangential line of sight...
  9. ergon

    T-line Impedance

    http://www.ece.utexas.edu/~grady/TOWERABC.html There is a free program at the above site.
  10. ergon

    How to analize the lateral forces in a soil due to a pole?

    The Brinch-Hanson method can be found at http://www.usda.gov/rus/electric/bulletins.htm The RUS Bulletin number is 1724E-205 "Embedment depths for concrete and steel poles".
  11. ergon

    EMF Software

    I am currently using version 1 of Fields software developed by Southern Caliofornia Edison Co. Is there a Windows version available to calculate electric and magnetic fields produced by three phase transmission and distribution lines? Alternatively, is there a reasonably priced equivalent?
  12. ergon

    GIS Field Viewing Solution for Utilities

    If you are looking for a Pocket PC solution look at ArcPad by ESRI or for a PC FieldNotes.
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