A 4 pole, 50 Hz, 3-phase induction machine is rated at 1480 rpm, and 240 V. A blocked rotor test yields the following measurements: three-phase power 460 W, line current 10.5 A and line to line voltage 58 V. A no-load test yields: 300 W, 6.0 A, 240 V. A DC resistance test yields values of 70 ohms for stator winding resistance (per phase, Y equivalent). Assume the approximate equivalent circuit (Re and Xm branch connected directly across the motor terminal): 1) Calculate the synchronous speed in rpm, the rated slip in percent, and the rated speed in rad/sec. 2) Calculate the series impedance (R₂', X₂') in ohms. 3) Calculate the shunt elements (Re, Xm) in ohms.

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Three-Phase Transformers

Three-segment transformers are a type of transformer used to transform voltages of electrical systems into three ranges. Two type transformers are shell-type transformer and core type transformer. In brief, it could be described because of the exquisite kinds of configurations.

Transformer

Ever since electricity has been created, people have started using it in its entirety. We see many types of Transformers in the neighborhoods. Some are smaller in size and some are very large. They are used according to their requirements. Many of us have seen the electrical transformer but they do not know what work they are engaged in.