Diagnosis and systematic condition assessment of transformers

Learn what types of faults occur in transformers and how they can be diagnosed using on-site measurements.

Get plenty of practical advice on how to properly perform diagnostic measurements and how to interpret them.

In addition, you will learn how to systematically manage a fleet of transformers through a meaningful condition assessment.

Your motivation

  • Do you work in the field of diagnostics of transformers?
  • Do you know the situation where you are not sure when and to what extent a transformer diagnosis is necessary?
  • Are you confronted with the task of designing a reasonable maintenance strategy for a fleet of transformers and would like to know how to proceed?
  • Do you already have experience with transformer diagnostics and simply want to deepen your knowledge?

Then this training is the right choice for you!

Aims of the training

  • Learn which abnormalities or types of faults can occur in a transformer and how to diagnose them using diagnostic procedures.
  • You will become familiar with the various applicable standards and guidelines.
  • You will be provided with important knowledge on how to properly perform electrical measurements. The focus will be on basic electrical measurements as well as frequency response analysis.
  • Learn the theoretical and normative basics that must be mastered for the interpretation of measurement results.
  • With the help of practical exercises, you will learn about the most common abnormalities of a measurement with regard to interpretation (e.g. measurement errors, types of errors, external influences).

Training content

Day 1:

Training content

Day 2:

Module A:


  • Anomalies or types of failures that can occur.
  • Overview of factory tests
  • Overview of commercially available diagnostic measuring devices
  • Applicable standards and guidelines



Module B:

Transformer diagnostic procedures

  • Oil analysis
  • Basic electrical measurements (ratio, resistances, short-circuit impedance, open-circuit currents, capacitance and dissipation factor measurements, insulation resistances)
  • Advanced electrical measurements (frequency response, dielectric response, partial discharges)
  • When is a diagnosis useful and to what extent?
  • Added value of online monitoring systems
  • Additional information / data for a successful diagnosis

Module C:

Instructions for the correct performance of electrical measurements

  • Preparatory precautions
  • Connection technique
  • Common measurement errors
  • On-site plausibility check of measurement results
  • Practical measurement


Module D:

Hints for the correct interpretation of measurement results

  • Interpretation according to standard
  • Interpretation by comparability and by practical experience
  • Practical example


Module E:

Condition assessment

  • Procedure for a systematic condition assessment


Previous knowledge:

Fundamentals of electrical engineering, initial experience with transformers.

Target group:

Specialized personnel from the field of diagnostics (measurement, evaluation).
Addressed are employees who work in the field of maintenance, inspection, repair or diagnosis of transformers.

Training duration:

2 days

Training location:



Dr. Juan Velásquez
(You can find the trainer's curriculum vitae at the bottom of this page).


17-18 Oktober 2023


EUR 1.140,00
The price includes training materials, participant certificate, lunch, drinks during breaks and a common dinner on the first training day.

If you need overnight accommodation, we will be happy to help you find it.

Please register by mail or fax to:

Nadine Peters

Hubert Göbel GmbH

Siemensstraße 42

D-59199 Bönen

Tel.    +49 2383 6189 694

Fax:   +49 2383 6189 691

Mail: n.peters(at)hgmes.de

Internet: www.hgmes.de

Download of the Training brochure

Trainer of this training

Juan Velásquez studied electrical engineering in Venezuela. From 2002 to 2006, he worked as a maintenance and project engineer in the aluminum industry. From 2006 to 2008, he was involved in the implementation of monitoring systems of power transformers. From 2008 to 2011 he was a product manager for diagnostic solutions at OMICRON electronics. In 2011 he obtained his PhD in the field of monitoring and diagnostics of power transformers in Spain. From 2011 to 2016, Juan worked as an engineer for HVDC technology at Amprion GmbH. Since August 2016, he has been working at Hubert Göbel GmbH.