When the slip of induction motor is negative i.e. , when the induction motor runs at a speed greater than synchronous speed, the induction motor runs as a generator called induction generator. Working of Induction Generator When a 3-ϕ induction motor is given A.C supply and is mechanically coupled to a prime mover then it […]
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A double cage rotor induction motor gives excellent starting and running characteristics than a deep-bar cage rotor induction motor. It also provides a high starting torque with a low starting current. Therefore it is also known as low-starting current, high starting torque, low slip-motor. The rotor is well designed in order to have high resistance
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A transformer is a static A.C machine which transfers electrical energy from one circuit to the other circuit without change in frequency. Working Principle of Transformer Figure 1: Transformer.
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Unlike two winding transformer, an auto-transformer contains only one winding. This single winding serves the purpose of both primary as well as secondary. As this transformer employs only one winding, it uses less copper. Hence it is cheaper and more efficient.
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A transformer with tappings on the primary or secondary in order to control the voltage is called as a Tap changing transformer. The tappings are the percentage windings equipped to produce the desired amount of voltage. Tap changers are needed due to the following two reasons. To stabilize the voltage To control the voltage. Tap
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Figure 1: Open Delta Connection of Transformer.
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Current inrush phenomenon in transformer is the flow of high magnetizing current for short time in primary winding when the transformer is switched ON at the instant when applied voltage is zero.
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Figure 1: Sumpner’s Test (Back to Back Test) of Transformer. Sumpner’s test is the improved method of determining the regulation, efficiency and heating on load conditions than O.C and S.C tests. This test requires two similar transformers, which can be connected to the supply in such a way that one is loaded on other. The
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Depending upon the type of core used there are two types of transformers in practice. They are, Core type transformer Shell type transformer. Core Type Transformer Figure 1: Core Type Transformer.
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