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Lab Power Transformer Open and Short Circuit Tests ObjectivesTo conduct standard open and short circuit tests in order to nd the parameters of the equivalent circuit of a transformerEvaluate the regulation and efficiency of the transformer at a given loadCheck the excitation characteristics of the transformerEquipment

Practical short circuit test Procedure Ensure that the power supply (unit ) is switched offMake the appropriate connections either for virtual or conventional instrumentation shown in figure using unit In the virtual instrumentation set the range of ammeters in low mode.

And also short circuit power factor, Cos sc = W sc V sc I sc The equivalent circuit obtained from this test is shown belowIt should be noted that, before calculation of parameters, you must be aware in which side (primary or secondary) the test reading being recorded.

Short Circuit TestIn the short circuit test one of the windings is short circuited by thick wireWattmeter, ammeter and voltmeter are connected as shown in figureReduced voltage is applied through auto figureReduced voltage is applied through auto transformer , such that ammeter reads rated value.

The short circuit generator consists of a kVA three phase engine that can generate kA, with a kV voltage that is the maximum short circuit voltage available for the testsThe facility also has different equipments such as switching devices, power transformers and resistor, inductor and capacitor banks in order to configure the load

July , by ElectricalUOpen and short circuit tests are performed on a transformer to determine the Equivalent circuit of transformerVoltage regulation of transformerEfficiency of transformerThe power required for open circuit tests and short circuit tests on a transformer is equal to the power loss occurring in the transformer.

The power required for these Open Circuit test and Short Circuit test on transformer is equal to the power loss occurring in the electrical transformersOpen Circuit Test of TransformerMethod No Load Test of a Transformer Connect the circuit as shown in figure below

Short Circuit Test In this test, the secondary side is short circuited with the help of the thick copper wire or a solid linkAs it is a general observation that high voltage side is always low current side and low voltage side always high current side therefore, we can say that in short circuit tests the primary and secondary are high and

Now let us determine the power loss in the winding resistance, i.e I R loss ( copper loss or variable loss ) with the help of a short circuit testShort circuit Test of Transformer The purpose of this test is to determine the following The equivalent resistance and reactance referred to the metering side ( used to find the regulation ).

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Open circuit test Short circuit test in transformersOpen circuit test and short circuit test are conducted to determine the core loss, copper loss, and equivalent circuit parameters of a transformerIn this article, in addition to the tests mentioned in the title, we will also discuss the polarity test and Sumpners test.