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.
What is an Autotransformer? Working Principle, Construction, Types & Applications Read More »
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
What is Tap Changing Transformer? Circuit Diagram, Working & Types Read More »
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.
What is Transformer Inrush Current? Waveform, Nature & Problems Read More »
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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When a single-phase induction motor is supplied from a source, the flux produced will be alternating in nature. Due to transformer action, an e.m.f is induced in the stationary rotor bars and the flux produced will also be alternating. As the stator flux and the rotor flux have the same magnetic axis, they lack to
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Synchroscope instrument is used for synchronization process. i.e. Connecting 3 phase alternator for parallel operation. Necessity of Synchroscope In power system, the 3 phase alternators, transformers are connected in parallel with system. When 3 phase alternator are connected to the line or system, the correct instant of connecting it to the system is important. That
What is Synchroscope? Working, Construction, Diagram & Applications Read More »
The ratio of the phasor sum of E.M.Fs induced in all the coils distributed in a number of slots under one pole to the arithmetic sum of the E.M.Fs induced is known as distribution factor (Kd). It is also known as breadth factor (Kb).
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