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Electrical Inspection

Part 1: Introduction

  1. abc

Part 2: Tips

  1. Check oil sight glass levels on bearings.[1]

  2. oil level sight glass    oil level sight glass

    Oil levels should be slightly over sight glass center line.

  3. Check all exposed electrical connections for tightness.
  4. Visually check generator bearing housings for any sign of oil seepage[1].
  5. Inspect generator air filters for buildup of contaminants. Clean or replace as required.
  6. Check transformers, fuese, capacitors, lightning arrestors for loose mounting or physical damage.
  7. Check all lead wires and electrical connections for proper clearance and spacing.
  8. Check insulation resistance to ground on all generator windings:
    1. Main rotating assembly
    2. Main stator assembly
    3. Exciter and PMG stationary fields
    4. Exciter armature assembly

    Insulation Resistance test, TransEuroEngineering, YouTube

    Insulation Resistance Test, chriskitcher, YouTube

  9. Visually inspect generator windings for oil or dirt contamination. Excessive contamination may necessitate surface cleaning with compressed airand electrical solvent.

Part 3: References and Bibliography

  1. Kato Engineering Generator Operation Maintenance Manual
  2. Kato Engineering generator design was widely used. Now Kato has become part of Emerson.

  3. IEEE Std 141-1993 red color book Power Distribution for Industrial Plant
  4. IEEE Std 142-1991 Green color Book Grounding Industrial Power System
  5. IEEE Std 241-1990 Gray color Book Commercial Building Power Design
  6. IEEE Std 446-1995 Orange color book Emergency and Standby Power System
  7. IEEE Std 450-2002 Battery Test and Maintenance
  8. IEEE Std 493-2007 Gold color book Design of Reliable Industrial and Commercial Power Systems