Duration: 8 hours
This course provides a structured and comprehensive understanding of on-load tap changers (OLTCs), combining operational principles, construction concepts, switching technologies, diagnostics, and advanced testing methodologies into a single engineering-focused programme. Rather than treating OLTCs only as transformer accessories, the course explains their central role in voltage regulation, transformer reliability, and power-system stability under real operating conditions.
A strong emphasis is placed on practical diagnostics and interpretation of dynamic resistance measurement (DRM) results, including resistor-type and reactor-type OLTCs, special configurations, synchronization assessment, and advanced troubleshooting. The programme integrates electrical, mechanical, oil-based, and vibro-acoustic diagnostic approaches, reflecting real industrial maintenance, commissioning, and condition-assessment practices used by utilities, service providers, and transformer manufacturers.
Academy Lecturer
Dr. Levi spent his entire career in diagnostic testing transformers and other substation apparatus, while the last 15 years dealing with tap changers. He is senior member IEEE and vice-chairman of the working group for revision of Guide for testing power transformers. Raka Levi consulted clients on all 5 continents in the field of condition assessment and substation monitoring.
Academy Lecturer
Edis Osmanbasic is a Senior Project Lead Engineer for BESS and Microgrids at Hitachi Energy Sweden. His responsibilities are all technical aspects of the full BESS station from selecting main components to defining full system automation. Before this role, he was an Application and Testing Specialist at DV Power, Sweden for 14 years. His experience involves diagnosing transformer test results and defining and proposing maintenance strategies for HV equipment. His focus was developing test methods for condition assessment of transformers, OLTCs, and generators. Edis has published numerous papers on DRM methodology and transformer testing methods. He holds an MS in electrical engineering.
Basic Level
To access this content please login below: You are unauthorized to view this page. Username or E-mail Password Remember Me Forgot Password
Intermediate Level
Test techniques applied to transformers with on load tap changers
Intermediate Level
Testing resistor type on load tap changers
Intermediate Level
This is the third e-lesson in the entire course, and the second one on the Intermediate level.
Intermediate Level
Dynamic test techniques applied to transformers with reactor type on load tap changers
Intermediate Level
Explaining arcing tap switch, an overview of diverter and selector, difference in various manufacturers’ designs, and a brief preview of the future sessions
Master's Level
The first e-lesson on the Master's level of the OLTC Course!
Master's Level
Eighth lesson of the OLTC Course is the second lesson on the Master's level, as well as the final lesson of the entire course
