E-lesson

Transformer Testing Course – e-lesson #8: Lightning impulse test (part II)

The 2nd part of lightning impulse testing lesson, with focus on waveshape control and evaluation of oscillatory and high overshoot LI waveforms.

Intermediate level
Transf. testing course - e-lesson #8 illustration
Intermediate level

Hosted by: Balazs Sztari

This is the second part of lightning impulse testing lesson, with focus on waveshape control and evaluation of oscillatory and high overshoot LI waveforms, including some examples of LI failure.

The lesson will provide an overview of relevant standards, discuss practical considerations for achieving optimal wave shapes, and explore solutions for dealing with non-standard wave shapes and tail time challenges. Examples of lightning impulse failures will be presented to illustrate common issues encountered during testing. The lesson aims to equip participants with a deeper understanding of the complexities involved in lightning impulse testing of power transformers.

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This is the continuation of Lesson #7, where the attendees had the opportunity to learn about the basics and standards of lightning impulse testing of power transformers. The timeframe of one lesson was not enough to cover this topic fully, therefore next lesson of Transformer Testing Course will be the second part of LI testing lesson. Based on most of the audience’s questions, this lesson will focus on the waveshape control and evaluation of high-overshoot and/or oscillatory LI waveforms.

It will contain some examples of LI failure with fault description.

Keywords: Power Transformers, Transformer Testing, Lightning impulse, High voltage, Measurement

 

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.