update lab 5,,,,, (1)

update lab 5,,,,, (1) - Transformer Tests ABSTRACT The...

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Transformer Tests ABSTRACT: The experiment aims to study open-circuit, short-circuit and load transformer tests and learn about their practical purpose in the engineering practice through evaluation of parameters such as core loss in watts, resistance R C , magnetizing reactance X m , flux density in the core, leakage reactance Xeq and percentage voltage regulation. Rated current was not exceeded in all the tests perform. INTRODUCTION: The transformer is a device which transfers energy from one electrical circuit to another electrical circuit through magnetic field as coupling medium. In this process it does not change the frequency of voltage or current. It works on the basic principle of electromagnetic induction (mutually induced e. m. f.). Being a static device it has a very high efficiency as compared to rotating machine of same rating as the losses are less. Power input to the transformer. P 1 = readingof water m .f . poweroutput ¿ thetransformer P 2 = V 2 I 2 ( cos θ being unity for lamp bank load) Now percentage efficiency: Percentageefficiency = P 2 P 1 100 When primary winding of transformer is energized with source of voltage V 1 an e.m.f. E 2 is induced across the secondary winding and it is also equal to secondary terminal voltage V 2 till there is no load across secondary winding. As soon as load is applied across the secondary winding the terminal voltage is decreased from E 2 to V 2 this phenomenon of changing the voltage is called “voltage regulation”. We can define voltage regulation in numerical term as “it is change in secondary terminal voltage from no load to full load with respect to the secondary no load voltage”. Thus, percentagevoltage regulation = E 2 V 2 E 2 100 The performance parameters of interest can be obtained by solving that circuit for any load conditions. The equivalent circuit parameters are available to the designer of the transformers from the various expressions that he uses for designing the transformers. The voltage regulation should be as small as possible. Transformer being highly inductive device works on lagging power factor unless the load of highly capacitive nature is connected across the secondary winding to make overall circuit resistive purely or capacitive in nature.
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