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PREVENTIVE MAINTENANCE OF POWER TRANSFORMERS

Items listed below are included in the recommended major maintenance schedule for Power transformers.
  • Insulation Power Factor Including Bushings and Arrestors
  • Excitation Current Tests
  • Insulation Resistance
  • Turns Ratio Test Including LTC
  • Winding Resistance Tests
  • Bushing Current Transformer Tests (Ratio, Polarity, And Saturation)
  • External Inspection of Tanks and Accessories
  • Check Nitrogen Pressurization
  • Check LTC Remote Control and Indication
  • Check Operation of Cooling Systems (Manual and Automatic)
  • Calibration Check of Liquid Level and Temperature Gauges
  • Perform Functional Check of Control and Alarm Circuits
  • Record Transformer Loading Data
  • Extract Oil Sample

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