Course author: Balazs Sztari

TRANSFORMER TESTINGCOURSE

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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WHAT YOU WILL LEARN ABOUT HERE

LEARN ABOUT RELEVANT STANDARDS, TEST AND EVALUATION METHODS, AND

REQUIREMENTS FOR TEST EQUIPMENT OF NO-LOAD LOSS AND CURRENT

MEASUREMENT OF POWER TRANSFORMERS.

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 1 Introductorylesson

Basic presentation about transformer tests

 2 MeasureMentofvoltageratIoandcheckofphasedIsplaceMent

Learn about definitions, test circuit requirements, procedures and results evaluation of voltage ratio and phase dis-placement measurement on transformers

 3 WIndIngresIstanceMeasureMent

Ohmic resistance between the terminals of a power transformer is a tool of key importance for production quality con-trol, factory acceptance test, diagnostics and condition assessment. Learn about the techniques and method of this test.

 4 short-cIrcuItIMpedanceandloadlossMeasureMent

Basics and techniques of these tests with the usual detailed explanations

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 5 no-loadlossandcurrentMeasureMent

No-load loss and no-load current measurements are elementary parts of every transformer factory acceptance test. Learn about the basics and techniques of these tests with the usual detailed explanations.

 6 dIelectrIctestsonpoWertransforMers

This lesson provides an overview of dielectric tests without going into the details of test techniques, and organizes the tests according to their standard (IEC and IEEE) requirements and which part of the transformer insulation is tested

 7 lIghtnIngIMpulsetest

Learn about the basics and techniques of lightning impulse and chopped wave LI tests, as the highest peak value dielec-tric tests intended to verify the insulation integrity for stresses caused by atmospheric overvoltages and transients

 8 lIghtnIngIMpulsetest(part2)

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.

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 9 sWItchIngIMpulsetest

Learn about IEC and IEEE standard requirements, test connections, waveform control and evaluation, testing techniques, and failure cases.

10 applIedvoltagetest

Applied voltage test of power transformers – learn about IEC and IEEE standard requirements, test connections, testing techniques, and failure cases

11 lIneterMInalacWIthstandvoltagetest(ltac)

Continue learning about relevant standards, test and evaluation methods, and requirements of test equipment for line terminal AC withstand voltage test of power transformers

12 InducedvoltagetestandpdMeasureMent

The most important information about induced voltage testing and partial discharge measurement on power transformers

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13 teMperaturerIsetest

Learn about temperature rise test of power transformers (theoretical fundamentals and standard references of this test). The details of required test equipment, the test procedure, the interpretation method, and fault cases are shown in the presentation.

14 soundlevelMeasureMent

The presenter speaks about the measurement methods and standard references of this test. The details of required test equipment, the test procedure, the interpretation method, and fault cases will be shown in the presentation as well.

15 teMperaturerIsetest(part2)

This lesson is a continuation of lesson #13 in which we have learned about the basics of temperature rise measurement on power transformers. The presentation also includes answers to questions asked after the previous lesson on tem-perature rise measurement.

16 Zero-sequenceIMpedanceMeasureMent

Zero-sequenceimpedance of the transformer is an important parameter for three-phase electrical network design and fault calculations. You can learn in this lesson how to measure this parameter properly.

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17 InsulatIonresIstanceMeasureMent

The most basic insulation test method, which is part of the factory and site tests of every transformers. This lesson pres-ents the theoretical background and practical application of this measurement.

18 capacItanceanddIelectrIcdIssIpatIonfactorMeasureMent

In this lesson, we will learn about an insulation testing method with AC voltage, for capacitance and loss factor. The easi-est way to determine the quality and condition of the transformer insulation is with this method.

19 tap-changertests(oltcandnltc)

The only moving part of the active part of the transformer is the tap changer, so its testing must be carried out with spe-cial care. We can learn about these test methods in this lesson.

20 checkofauxIlIarIes

The cooling control, protection, measuring and monitoring devices of the power transformer shall be tested during the factory acceptance test. This lesson will introduce standard testing methods for these devices.

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21 MechanIcaltests

Not only electrical, but mechanical tests shall be performed on the power transformers during factory acceptance tests. You will learn what are the standard methods of these tests.

22 TESTS ON INSULATION OIL

This lesson describes the sampling and most important test methods for insulating fluids and the requirements for accepting their results.

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