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    E-lesson

    OLTC Course – e-lesson #6 – Testing reactor type on load tap changers

    OLTC Course - e-lesson #6
    Course: Intermediate level

    Hosted by: Raka Levi / Intermediate level

    Dynamic test techniques applied to transformers with reactor type on load tap changers

    This lesson focuses on testing reactor-type tap changers, which exhibit very different behavior compared to resistor-types. Key design differences like bridging vs. non-bridging positions impact the dynamic response during testing. Various tap changer models are covered, including single-arm, two-arm, and vacuum interrupter designs. Understanding the specific technology is crucial for interpreting test results. Factors like ripple patterns, contact condition, and phase differences are analyzed to diagnose potential issues. The lesson highlights the complexities of reactor-type tap changer testing and sets the stage for the next lesson on result analysis.

    This lesson is conducted on Intermediate level, but you can choose the level which suits your needs best.

    For the entire syllabus, see the OLTC Brochure.

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    Dynamic diagnostic techniques for condition assessment of power transformers equipped with reactor type on load tap changers, dynamic resistance measurement, vibration analysis, good graphs, bad graphs, defect detection, etc.

    Keywords: Dynamic test, diagnostics, reactor OLTC, transformer, preventive autotransformer

    To attend other lessons, which are now available on demand, click here.

    About the author

    Raka Levi

    Raka Levi

    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.

    Edis Osmanbacis

    Hitachi Energy

    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.

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