L-25(TB)(ET) ((EE)NPTEL)

# L-25(TB)(ET) ((EE)NPTEL) - Module 7 Transformer Version 2...

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Module 7 Transformer Version 2 EE IIT, Kharagpur

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Lesson 25 Testing, Efficiency & Regulation Version 2 EE IIT, Kharagpur
Contents 25 Testing, Efficiency & regulation 4 25.1 Goals of the lesson …………………………………………………………………. . 4 25.2 Determination of equivalent circuit parameters ……………………………………… 4 25.2.1 Qualifying parameters with suffixes LV & HV ……………………………. 5 25.2.2 Open Circuit Test …………………………………………………………. .. 5 25.2.3 Short circuit test ……………………………………………………………. 6 25.3 Efficiency of transformer ……………………………………………………………. . 8 25.3.1 All day efficiency …………………………………………………………. .. 10 25.4 Regulation ……………………………………………………………………………. 11 25.5 Tick the correct answer ………………………………………………………………. 14 25.6 Solves the Problems …………………………………………………………………. 15 Version 2 EE IIT, Kharagpur

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25.1 Goals of the lesson In the previous lesson we have seen how to draw equivalent circuit showing magnetizing reactance ( X m ), resistance ( R cl ), representing core loss, equivalent winding resistance ( r e ) and equivalent leakage reactance ( x e ). The equivalent circuit will be of little help to us unless we know the parameter values. In this lesson we first describe two basic simple laboratory tests namely (i) open circuit test and (ii) short circuit test from which the values of the equivalent circuit parameters can be computed. Once the equivalent circuit is completely known, we can predict the performance of the transformer at various loadings. Efficiency and regulation are two important quantities which are next defined and expressions for them derived and importance highlighted. A number of objective type questions and problems are given at the end of the lesson which when solved will make the understanding of the lesson clearer. Key Words : O.C. test, S.C test, efficiency, regulation. After going through this section students will be able to answer the following questions. Which parameters are obtained from O.C test? Which parameters are obtained from S.C test? What percentage of rated voltage is needed to be applied to carry out O.C test? What percentage of rated voltage is needed to be applied to carry out S.C test? From which side of a large transformer, would you like to carry out O.C test? From which side of a large transformer, would you like to carry out S.C test? How to calculate efficiency of the transformer at a given load and power factor?
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L-25(TB)(ET) ((EE)NPTEL) - Module 7 Transformer Version 2...

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