Stockbridge, MI Best Practices Seminar
Transformer field testing is still today the main activity performed all over the world to determine the condition of a transformer and it is based on the traditional tests: Power factor, turns ratio, winding resistance, excitation current and leakage reactance. All these tests have been in use for many years, although technology and years of investigation have brought to each of these test’s innovations that have made them more accurate, effective, and efficient.
Megger’s Best Practices Seminar is designed to present the latest advancements in transformer testing and better assessment of transformer health condition. The seminar is divided in two main sections: dielectric assessment and winding assessment.
In the diagnostic of the dielectric, we will cover the basics of power factor testing to then cover the new horizons of this traditional testing: 1 Hz and Individual Temperature Correction (ITC). Next, we will see how moisture content inside a transformer can be determined as well as the value of the conductivity of the oil using Dielectric Frequency Response technique.
The winding assessment section starts presenting a new dawn of the step-up technique for turns ratio testing as well as benefits of true three phase testing. Then winding resistance is discussed to illustrate how the test is much more efficient with dual excitation and the benefits of adaptive demagnetization. Dynamic testing of the On Load Tap Changer will cover the analysis of dynamic resistance and motor current. To complete the winding assessment section, we will discuss high voltage excitation current as well as leakage reactance and ability to determine the efficiency of the transformer.
Leveraging on the fact that majority of the above-mentioned tests are also practiced on instrument transformers, we are also presenting about the field challenges to test current transformers and the mitigation techniques.
At the end a hands-on demonstration will be given to show how all these improved tests in action. The demonstration will cover power transformer testing as well as instrument transformers.