electrical machines

1ϕ and 3ϕ Transformer for Open-Circuit and Short-Circuit testAbstract Transformer is a static devices that changes Ac electric power at one voltage level into AC electric power at another voltage level through the action of a magnetic field. It consists of two or more coils of wire wrapped around a common ferromagnetic core. These coils are not directly connected usually. The only connection between the coils is the common magnetic flux present within the core. One of the transformer windings is connected to a source of AC electric power, and the second transformer winding supplies electric power to loads. The transformer winding connected to a power source is called the primary winding or input winding. The winding connected to the loads is called the secondary winding or output winding.
Introduction The open-circuit test, or "no-load test", is one of the methods used in electrical engineering to determine the no-load impedance in the excitation branch of a transformer. In this experiment, open-circuit test is conducted on single-phase and three-phase transformer to determine the iron core resistance, Rc and magnetized reactance, Xm.
The purpose of short-circuit test is to determine the series branch parameters of the equivalent circuit of a Real transformer. The series branch parameters is the summation of primary and referred secondary resistances and reactance if refer to primary sides. In other words, short-circuit test is conducted on single-phase and three-phase transformers to determine the winding resistance, Req and leakage reactance, Xeq.
The aim of this experiment is to measure, determine and analyses the parameters of single-phase or three-phase transformer and torque-speed characteristics of rotating machines.
Besides that, we are required to differentiate the construction and winding of single-phase or three-phase transformer. Through this experiment, we have to develop the connection wiring for single-phase and three-phase transformer and