OLTC Course - e-lesson #7

E-lesson: OLTC Course – e-lesson #7 – Analysis of OLTC test results

Course: Master’s level

This is the first e-lesson on the Master’s level of the OLTC Course, but feel free to choose the level that suits your needs best.

To see the entire syllabus, see the OLTC Course Brochure.

E-lesson #7 – Analysis of OLTC test results 

This session is going to talk about the analysis of results from dynamic test techniques applied to transformers with on load tap changers

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Learn about:

  • good / bad results
  • resistor type OLTC
  • reactor type OLTC
  • vacuum type OLTC
  • various failures detected using test methods


Keywordsdynamic test results, diagnostics, resistor, reactor OLTC, preventive autotransformer

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.

Raka Levi

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