Comprehensive Power Transformer Preventive Maintenance

Course Duration: 2 Days

The 2-day course (16 hours) will focus on the Preventive Maintenance of Electrical Transformers. A basic understanding of a transformer and its construction will be discussed, and the theories of the electrical test to be performed. Proper procedures on testing will also be discussed on the first day. All procedures will be based on the InterNational Electrical Testing Association (NETA). On the second day, safety and testing procedures will be implemented before hands on training. Testing of power transformer will be performed.


The objective of this seminar is to inform the participants of the importance of preventive maintenance of power transformers, its major components, and to guide them on the testing and evaluation of results of the power transformer.

At the end of the program, the participants will be able to: 

  • Explain different types of transformer
  • Know the major parts of a transformer
  • Discuss the nameplate data
  • Know the safety procedures in preventive maintenance of transformer
  • Discuss the electrical testing performed on transformers
  • Evaluate electrical test results gathered
  • Knowledge in present technologies in preventive maintenance of transformer


Classroom discussion and hands-on training

Topics to be Discussed:


  1. Introduction
  2. What is a transformer
    • History
    • Principle
    • Types and Design
    • Construction
    • Cooling Classification
  • Components and Indicators
    • Major Components
    • Indicators, Alarms
  1. Nameplate
    • Nameplate data
  2. Importance of Preventive Maintenance of Power Transformer
  3. Theory and Procedures for Transformer Electrical Test
    • Visual Inspection
    • Insulation Power Factor Test
    • Insulation Resistance Test
    • Transformer Turns Ratio Test
    • Winding Resistance Test
  • Special topics
    • Excitation Test
    • Impedance Test
    • SFRA Test
    • DGA and Oil Quality Test

DAY 2:

  1. Safety procedures in Testing
  2. Hands on Power Transformer Testing (As per ASTM NETA Guidelines)
    • Insulation Power Factor Test
    • Transformer Turns Ratio Test
    • Winding Resistance Test
    • Insulation Resistance Test with P.I.
  • Evaluation of Results
  1. New technologies in testing

Transformer Insulating Oil Analysis


Course Duration: 8 Hours

This 8-hour practical course provides you with methods and procedures used internationally. This course will be discussing on predictive, periodic or condition based maintenance methodologies in oil filled power transformer maintenance. This will focus mainly on analyzing transformer insulating oils and what corrective actions can be done within the data given by the laboratory.


  • Have basic knowledge about transformer insulating oils.
  • Know different characteristics of transformer insulating oils.
  • Have knowledge on what tests to conduct in insulating oils.
  • Know proper sampling techniques in transformer tanks.
  • Interpret laboratory data and correct present abnormalities in the system.
  • Knowledge in present technologies in transformer and transformer oil maintenance.

Who Should Attend: 

This course will enhance the understanding and increase competencies for:

  • Engineers & technicians in the utility, transmission, and generation sectors that operate and maintain oil filled power transformer in substations.
  • Engineers and electricians in commercial and industrial field that maintains oil filled power transformers.
  • Electrical engineering graduates who would like to be test and applications engineers and Technicians for substation.

Topics to Be Discussed:

  1. Introduction to Insulating Oils and Power Transformer
  2. Characteristics of Insulating Oils
  3. Maintenance on Oil Filled Power Transformer and Oil Itself
  4. Mineral Insulating Oils Tests (ASTM, IEC and IEEE C57.104 Guidelines)
  5. Moisture in oil
  6. Sampling Techniques and Procedures
  7. Interpretation of Data (DGA and OQT)
    1. Most commonly used Techniques
    2. IEEE Guidelines C57.104
    3. Gas Ratios
    4. Duval’s Triangle
    5. Corrective actions
    6. New Tests and Technologies in the Industry
      1. Online and Offline Tests
      2. Dielectric Response Analysis
  8. Case Studies

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