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 »
Tap changing transformers are transformers equipped with mechanisms (tap changers) to modify the number of turns in the primary or secondary windings. This adjustment changes the voltage ratio, allowing the output voltage to be regulated under varying input or load conditions. What is Tap Changing Transformer? A transformer with tappings on the primary or secondary
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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.
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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A single phase non-salient pole synchronous motor with no D.C excitation is known as hysteresis motor. This motor is so called because it runs on torque produced by the hysteresis loss induced in the rotor. Figure 1: Hysteresis Motor.
What is Hysteresis Motor? Working, Diagram, Construction & Applications Read More »
We know that the expression for torque of an induction motor under running condition is given by, \[T=\frac{KsE_{2}^{2}{{R}_{2}}}{R_{2}^{2}+{{(s{{X}_{2}})}^{2}}}\]
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A constant voltage transformer (CVT) works on ferro-resonant principle. The variation in the primary flux with an unsaturated iron core does not affect the secondary flux with saturated iron core. Thus, the secondary induced voltage remains relatively independent of the voltage impressed upon the primary winding. Fig. 1: Constant Voltage Transformer (CVT).
What is Constant Voltage Transformer (CVT)? Working Principle, Diagram & Applications Read More »