# Open and short circuit test of a single phase transformer

## ECE 494 - Electrical Engineering Laboratory III TF#12 Open circuit test in hindi -- Full detail with formula

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It is possible to predict the performance of a transformer at various loadings by knowing all the equivalent circuit parameters. Without actually loading the transformer, these two assessed tests give the test results which are used to determine the equivalent circuit parameters. By these parameters, we can easily predetermine the efficiency and regulation of the transformer at any power factor condition as well as at any load condition. This method of finding the parameters of a transformer is called as an indirect loading method. This article enumerates how to perform these tests, how determine the equivalent parameters from test data and significance HV or LV side in which the calculation to be performed. This test is performed to find out the shunt or no load branch parameters of equivalent circuit of a transformer.

Recieve free updates Via Email! Home Electrical machines Power system Contact electricaleasy. These two transformer tests are performed to find the parameters of equivalent circuit of transformer and losses of the transformer. Open circuit test and short circuit test on transformer are very economical and convenient because they are performed without actually loading of the transformer. Open circuit or No load test on Transformer Open circuit test or no load test on a transformer is performed to determine 'no load loss core loss ' and 'no load current I 0 '. The circuit diagram for open circuit test is shown in the figure below. The ammeter reading gives the no load current I 0.

If it is used for converting power from a high voltage to a low voltage, it is called a step-down transformer. The conversion efficiency of a power transformer is extremely high and almost all of the input power is supplied as output power at the secondary winding. The transformer may be represented by the equivalent circuit shown in figure 3. The parameters may be referred to either the primary or the secondary side. The series resistances R 1 and R 2 represent the copper loss in the resistance of the two windings.

The open circuit and short circuit test are performed for determining the parameter of the transformer like their efficiency, voltage regulation, circuit constant etc. These tests are performed without the actual loading and because of this reason the very less power is required for the test. The open circuit and the short circuit test gives the very accurate result as compared to the full load test. The purpose of the open circuit test is to determine the no-load current and losses of the transformer because of which their no-load parameter are determined. This test is performed on the primary winding of the transformer.

## Open and Short Circuit Test of Transformer

The power required for open circuit tests and short circuit tests on a transformer is equal to the power loss occurring in the transformer., Post a Comment.

## Transformer Simulation - Perform open and short circuit tests easily inside SolidWorks

A transformer is a static electrical machine that transfers electrical energy between 2 or more circuits through the principle of electromagnetic induction. As shown in Figure 1, the transformer consists of a core usually laminated steel , a primary winding and a secondary winding. A time varying current in the primary coil produces a time varying magnetic field. This time varying magnetic field induces a voltage in the secondary coil. So, power can be easily transferred from one circuit to the other without physical contact.

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1. Jeanette L. says: