Aim To carry out the Polarity Test on a single-phase transformer Equipment: 3.3kVA 220/110V single-phase transformer ● Variac ● Multi-meters ● Clamp meter ● Lab leads Circuit Diagram 1.1 Vsupply Procedure S wwwwwww RANSFORMER V 3 ΑΛΛΛΛΛΛΑ MACHINE ctical V₂ One of the pre-requisites of parallel operation of transformers is that it must have the same polarity. This test is done to determine the similar polarity ends of a transformer LV and HV terminals. The ends that simultaneously acquire positive or negative polarity because of the emf's induced in them are said to be similar polarity ends. During this test two windings of a transformer are connected in series and one of the windings is excited from a suitable voltage source. If the voltage V3 is greater than V₁ the polarity is additive (i.e. the terminals which are connected together has different polarities). It V3 is less than Vi the polarity is subtractive meaning that the terminals connected together has the same polarity.
Load flow analysis
Load flow analysis is a study or numerical calculation of the power flow of power in steady-state conditions in any electrical system. It is used to determine the flow of power (real and reactive), voltage, or current in a system under any load conditions.
Nodal Matrix
The nodal matrix or simply known as admittance matrix, generally in engineering term it is called Y Matrix or Y bus, since it involve matrices so it is also referred as a n into n order matrix that represents a power system with n number of buses. It shows the buses' nodal admittance in a power system. The Y matrix is rather sparse in actual systems with thousands of buses. In the power system the transmission cables connect each bus to only a few other buses. Also the important data that one needs for have a power flow study is the Y Matrix.
Types of Buses
A bus is a type of system of communication that transfers data between the components inside a computer or between two or more computers. With multiple hardware connections, the earlier buses were parallel electrical wires but the term "bus" is now used for any type of physical arrangement which provides the same type of logical functions similar to the parallel electrical bus. Both parallel and bit connections are used by modern buses. They can be wired either electrical parallel or daisy chain topology or are connected by hubs which are switched same as in the case of Universal Serial Bus or USB.
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*Include calculations on results
*Fully label your circuit diagram
*Conclusion ca*Procedure should be at least 15 points, written in point form n be a paragraph and should include whether your aim is achieved or not, etc.
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