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Western Underground Fall Conference Scottsdale, AZ September 26, 2012

Western Underground Fall Conference Scottsdale, AZ September 26, 2012. Existing Primary Cable Fault Locating and Testing A Measured Approach Presented by Jerry L. Landers The Von Corporation. Primary Cable Fault Locating Radar Assisted. Also Known As: Arc Reflection/ARM Radar

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Western Underground Fall Conference Scottsdale, AZ September 26, 2012

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  1. Western UndergroundFall ConferenceScottsdale, AZSeptember 26, 2012 Existing Primary Cable Fault Locating and Testing A Measured Approach Presented by Jerry L. Landers The Von Corporation

  2. Primary Cable Fault LocatingRadar Assisted Also Known As: Arc Reflection/ARM Radar Time Domain Reflectrometer

  3. Generic Radar Signatures(Understanding TDR’s Riser Bond)

  4. Initial and Fault Traces

  5. Sectionalizing Practice: Refusing

  6. SECTIONALIZING OPTIONS • FAULT INDICATORS • RECLOSING • HIPOTING AT EACH TRANSFORMER • DIVIDE AND CONQUER • ARC REFLECTION

  7. DETRIMENTAL EFFECTS • INRUSH • VOLTAGE TRANSIENTS • CABLE / INSULATION DEGRADATION • SPLICE DAMAGE • TERMINATION FAILURES • MOMENTARIES • SYMPATHETIC CIRCUIT OUTAGES • IMPROPER FUSING

  8. OBJECTIVES • RESTORE POWER QUICKLY • ELIMINATE CABLE DAMAGE • ELIMINATE ACCESSORY DAMAGE • PROTECT CUSTOMER DEVICES. • ELIMINATE FUSING ERRORS • REDUCE LABOR / MATERIAL COSTS • ELIMINATE MOMENTARIES • ELIMINATE SYMPATHETIC OUTAGES

  9. Initial Radar Trace with Transformers inline.

  10. Radar Trace with Tranformers Marked

  11. Radar Trace with Transformers and Fault Marked

  12. Very Low Frequency Testing(VLF)

  13. Today we are going to probe this issue Hopefully each of you will leave with the intention of being proactive Your Utility must answer this question To Test or not to Test?

  14. Primary Cable Testing Is it necessary? What are the alternatives? Do nothing Injection Replacement strategy

  15. Why Test Reliability issues Identify defective cables Diagnostic for cable replacement plan

  16. For years utility engineers have been asked: How do we manage an aging underground infrastructure? How can we prolong the life or our older assets? By what means can we know which cables to replace?

  17. Questions lead to More Questions

  18. Non Destructive TestingDoes it exist?

  19. ON LINE ? OFF LINE ? AC DC VLF PD TAN DELTA

  20. There are however alternatives and measured approaches. A first step is only the prelude to the next, Without the first the other steps can not be taken. A good first step is to realize you must do something. Secondly quit adding to the problem. Sub standard workmanship and or materials are time bombs waiting to explode . Find ways to limit or slow down the aging process.

  21. Be Proactive Start Collecting Data Record Fault Activity Monthly Annually

  22. Determine Type Cable Fault Splice Fault Termination Fault Dig In

  23. Expand Parameters By Area By Cable Type By Age By Mfg

  24. Identify Problem Areas Geography Critical Circuits

  25. CONCLUSION After collection of the available information You will see what actions are indicated. There is no one size fits all or magic bullet. With fault activity types and frequency data. You are armed with enough information to meet with equipment suppliers and or testing providers to plan and budget your solutions.

  26. I would like to thank The Western Underground Committee Management and StaffAnd YOU Travel Safe

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