Power Transformer Failure Analysis and Troubleshooting Course

Course Overview:

This course provides an in-depth understanding of electrical power transformers, focusing on their design, testing, maintenance, and troubleshooting.

Participants will learn about the responsibilities for managing power transformers in substations, standards for routine and special tests, and the role of switchgear and protection systems. 

Key topics include transformer failure analysis, oil-immersed transformer diagnostics, insulation resistance measurement, and partial discharge testing. 

This course is appropriate for engineers and technicians in utilities, manufacturing, petrochemical industries, as well as commercial buildings. Such professionals are equipped with practical knowledge to improve operational challenges in a transformer unit's performance and reliability.

Course Objectives:

By the end of the training, participants will be able to:

• Develop a thorough understanding of electrical power transformer rules and their application
• Understand individual responsibilities for power transformers in substations
• Learn the detailed procedures for testing of power transformers standards
• Understand the power transformer failure analysis & troubleshooting
• Learn requirements for the maintenance of power & distribution transformers
• Develop an understanding of the role of switchgear and associated protection in transformers
• Identify key issues for the improvement of their company’s power transformers’ operation

Who Should Attend?

This course is intended for Engineers and Technicians from Electrical Power Utilities Companies, Manufactures, and Distributors of Power Transformers, Engineering professionals in Petrochemical Companies, and Commercial Buildings. Participants need no specific requirements other than a basic understanding of Electricity and Magnetism and knowledge of nature and operation of Power supply and distribution system.

Course Outlines:

Introduction of Power Transformers

• Historical survey of Transformer Development and Applications
• Transformer Design and Construction Defining Transformer Life Expectancy The Insulation System
• Life Time of Transformer
• Transformer’s Oil

Routine Tests

• Measurement of Voltage Ratio and Check of Vector Relationship
• Measuring of Winding Resistance
• Measuring of Impedance Voltage and Load Loss
• Measuring of No-Load Loss and Current
• Dielectric Tests 2.6 Separate- Source Voltage withstand Test
• Induced over - Voltage withstand Test
• Partial Discharge Measurement
• Test on On - Load Tap Changer

Special Tests

• Temperature Rise Test
• Measurement of Zero Sequence Impedance
• Measurement of Voltage & Current Harmonics
• Measurement of Insulation Resistance Measurement of Capacitance and (tan)
• Lightning Impulse Test
• Switching impedance Test
• Measurement of Acoustic Sound Level​

Oil Immersed Transformers

• Application Field
• Categories of Equipment
• Transformer Classification
• Specification for uninhabited Insulation Mineral Oil
• Main Standards used for Routine Tests
• Recommended limits for unused mineral insulating oils field in new Power Transformer
• Oil Functions
• Dissolved Gas Analysis (DGA)
• Incipient Fault Detection in Oil Immersed Transformer and Faults Types​

Measurements of Insulation Resistance

• Introduction of Insulation Resistance Measurements
• Two Windings Measurements
• Three Windings Measurements
• Measurement Analysis
• Measurement Instruments

Measurements of Voltage Ration

• Introduction
• Measuring Circuit
• Measurements Analysis
• Measurements Instruments
• Capacitance & Power Factor (C & (tan)
• Introduction
• Bushing Capacitance
• Power Factor Measurements
• Tap Insulation Capacitance
• Hot Collar Technique
• Transformer Capacitance
• Two Windings Transformer Test procedures
• Three Windings Transformer Test Procedures
• General Test Procedures for Windings
• Losses and Cos 0 variation with Test Voltage
• Test of Oil Insulation Power Factor
• Transformer Exciting Current Measurements

Partial Discharge Techniques

• What is Partial Discharge?
• Why Test for Partial Discharge?
• Occurrence of Discharge
• Physical Background of Partial Discharge
• Type of Partial Discharge 8.7 Magnitude of Discharge
• Characteristic of discharge Patterns
• Partial Discharge Test Facility
• Partial discharge with Induced Voltage
• Actual Detection Circuits
• How to calibrate the Partial Discharge System?
• How to measure Partial Discharge?
• Partial Discharge Methods Available
• On-Site Partial Discharge Measurements