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Case study SMUD

Case study SMUD. TASA code 2. DRM PERFORMED ON FPE TYPE OLTC. FPE CONTROLS. DGA. Increase in Hydrogen and Methane in 2011 Indicative of hot metal gasses breaking down the oil. TASA Diagnostic Evaluation. DGA Particle count Proprietary algorithms Operating procedure

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Case study SMUD

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  1. Case studySMUD TASA code 2

  2. DRM PERFORMED ON FPE TYPE OLTC

  3. FPE CONTROLS

  4. DGA Increase in Hydrogen and Methane in 2011 Indicative of hot metal gasses breaking down the oil

  5. TASA Diagnostic Evaluation DGA Particle count Proprietary algorithms Operating procedure Monitor for increased arcing Evaluate for worn or damaged components Indicated: Condition code 2

  6. TASA Comments A slightly abnormal dissipation of energy Early indication of fault or wear activity Heating indicated Abnormal arcing

  7. Result TASA - identifies the wear out of the failure mode and identifies issues DRM  - looks at the functionality timing sequence of the functional steps and identifies the abnormalities

  8. Static Resistance Graph of Phases (1,2, & 3) The first static resistance illustrated an issue in Phase 2

  9. Three distinct problems

  10. Dynamic Resistance Graphs Phase 2 – 16L to 16R We would expect to see symmetry through the reversing switch. Erratic behavior through the transitions High resistance through some contacts Problem 1

  11. Motor Current Graphic (Phase 2) FIVE CHARACTERISTIC TRANSITIONS DIRECTION 16R-N Phase 2 BAD Phase1 (same for Ph.3) GOOD

  12. Reversal Switch Issue When one complete side shows a problem Reversal switch is the culprit Phase 3 – 16L to 16R Phase 1 - 16R to 16L Problem 2

  13. Motor current The increase in motor current coincides with the squeaking noise heard during the motor operation. This could be an indication of misalignment of mechanical components. Problem 3

  14. Pictures of FPE OLTC Contacts with Problems Detected By Dynamic Resistance Measurement

  15. S I M I L A R

  16. BL = B phase Lower

  17. AL = A phase Lower

  18. Repair on FPE OLTC Right After our Findings

  19. Repairs Completed Updated diverters, installed shunt straps to all 6 diverters Replaced all arcing contacts, because of unusual cracking in face of contacts. Re-aligned face to face mating by bending arms until flush. Re-tensioned drive chain and drilled new pin Replaced 2 diverter barriers Replaced rotor bearings Replaced stationary contact locking tabs Replaced rotor contact nuts

  20. Before and After R tested from collector rings, to stationary contacts, through rotor (in milliOhms). Tap changer operates normally in the lower range. Went through Neutral once last December. Collector rings and contacts showed tarnish, no coking. Resistance after repair milliOhms

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