Dr. Diego Robalino
Megger

Diego Robalino is the Business Development Director – Power Transformers at Megger. He specializes in the diagnosis of complex electrical testing procedures and strategic development of state-of-the-art transformer testing technology. He has over 20 years of involvement in the electrical engineering profession with management responsibilities in the power systems, oil and gas and research arenas. Diego is a Senior Member of IEEE, member of IEEE/PES Transformers Committee, a certified Project Management Professional with the Project Management Institute (PMI), and the General Chairman for the IEEE/DEIS 2022 Electrical Insulation Conference. He is the author and co-author of over 40 technical articles related to power, distribution and instrument transformer condition assessment. Diego received his Ph.D. in Electrical Engineering from Tennessee Technological University while doing research in power system optimization with a focus on aging equipment.

This course describes the most important methodologies used for transformer insulation diagnostics in the field. The topics include frequency domain methodologies described in the international literature including line-frequency power factor, narrow band and full spectrum dielectric response as applied in power, distribution, instrument transformers and HV bushings.

Module 1 – Introduction

• Transformer Insulation
• Fundamentals of Insulation Diagnostics
• Standardization

Module 2 –Frequency Domain Dielectric Response

• Line-frequency power factor
  • Capacitance & Power Factor measurement
  • Factors influencing results of Power Factor test
  • Temperature Correction
  • Voltage dependence of Power Factor
• Tan-delta analysis of liquid insulation
  • Mineral Oil & Alternative fluids

Module 3 –Dielectric Frequency Response

• Theory
• Effect of moisture on oil-paper insulation
• Narrow band frequency response
  • Sensitivity of 1 Hz
  • Interpretation of results
• DFR on Power and Distribution Transformers
• Temperature effect on the dielectric response

Module 4 –Three steps for HV bushing condition assessment

• Line-frequency Power Factor on HV and EHV bushings
• NB DFR on HV Bushings
• HV DFR on HV Bushings
• Definitive diagnostics with DFR

Module 5 -Special Applications of DFR

• Case studies

• Engineers and Field personnel responsible for the planning and execution of testing practices in the field
• Asset managers, operation managers responsible for condition assessment of critical components in the electrical system
• Industry experts looking at new technological tendencies in the field testing arena
• Consultants who are looking for more advanced and efficient tools to assist and support their customers

Upon completion of this course, attendees will be able to:

• Identify the requirements to performs an efficient and safe test procedure in the field
• Understand the challenges encountered in the field for transformer field assessment
• Properly analyze the test data from the field
• Make proper use of advanced features in power factor technology
• Apply sound technical decisions related to transformer insulation diagnostics

Registration now open!

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