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    E-lesson

    Transformer testing course – e-lesson #16: Insulation resistance measurement

    Course: Master’s level

    Hosted by: Balazs Sztari / Master's level

    Join us for the lesson #16 of the Transformer testing course, authored and hosted by Balazs Sztari. The lesson is presented on the Master's level and here you can register.

    This lesson will cover the fundamentals of insulation resistance measurement on power transformers. Insulation resistance is a simple yet important test method for checking the quality of transformer insulation. We'll discuss the relevant standards, the theoretical background of DC voltage application, and the instrumentation required. The measurement process, including the use of guard potential to isolate individual insulation components, will be explained. Insulation resistance can be measured between windings, between windings and ground, and on the core and frame. Temperature correction and the lack of standard acceptance criteria will also be addressed. This lesson provides a comprehensive overview of this essential transformer diagnostic technique.

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    Learn about relevant standards, test and evaluation methods, and requirements for test equipment of no-load loss and current measurement of power transformers.

    Insulation resistance measurement is most basic insulation test method, which is part of the factory and site tests of every transformers.

    This lesson presents the theoretical background and practical application of this measurement.

    Recommended browsers for the successful registration: Chrome, Edge, Mozilla, Safari

    We strongly advise you to avoid using Internet Explorer, due to compatibility issues!

    In order to ensure that your registration was successfully completed, please, after applying for the e-session, carefully check the inbox of the email account you are using. If you don’t see the confirmation email, please check your spam / junk folder as well. If the confirmation email is in that folder, please, move it to your inbox. This should eliminate any future issues with the registration process.

    Also, we recommend checking firewall settings with your network provider.

    To access the e-lesson, use the room link and the password provided in the confirmation email.

    About the author

    Balazs Sztari

    Balazs Sztari

    Ganz Electric

    Balazs Sztari graduated as electrical engineer in Budapest. Beside of factory acceptance tests, his team performs commissioning, diagnostics and R&D tests on power transformers and rotating machines.

    He is currently a member of Cigre A2.53 working group.

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