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Category: SINGLE-PHASE TRANSFORMERS

  •  TRANSFORMER ON DC

     TRANSFORMER ON DC

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    A transformer cannot work on DC supply. If a rated DC voltage is applied across the primary, a flux of constant magnitude will be set up in the core. Hence, there will not be any self-induced emf (which is only possible with the rate of change of flux linkages) in the primary winding to oppose the…

  •   AN IDEAL TRANSFORMER

      AN IDEAL TRANSFORMER

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    To understand the theory, operation, and applications of a transformer, it is better to view a transformer first as an ideal device. For this, the following assumptions are made: Fig. 10.10  Top view of berry-type transformer Thus, an ideal transformer is one which has no ohmic resistance and no magnetic leakage flux, that is, all the…

  •  CONSTRUCTION OF A SINGLE-PHASE SMALL RATING TRANSFORMER

     CONSTRUCTION OF A SINGLE-PHASE SMALL RATING TRANSFORMER

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    Single-phase small rating transformers are shown in Figure 10.4. According to the core construction and the manner in which the primary and secondary are placed around it, the transformers are named as follows: Fig. 10.4  (a), (b) and (c) Small rating 1-phase transformers 10.4.1  Core-type Transformers In a simple core-type transformer, the magnetic core is built up of…

  • WORKING PRINCIPLE OF A TRANSFORMER

    WORKING PRINCIPLE OF A TRANSFORMER

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    The basic principle of a transformer is electromagnetic induction. A simple form of a transformer is shown in Figure 10.3(a). It essentially consists of two separate windings placed over the laminated silicon steel core. The winding to which AC supply connected is called primary winding and the winding to which load connected is called a secondary…

  • TRANSFORMER

    TRANSFORMER

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    A transformer is a static device that transfers AC electrical power from one circuit to the other at the same frequency, but the voltage level is usually changed. The block diagram of a transformer is shown in Figure 10.1. When the voltage is raised on the output side (V2 > V1), the transformer is known as step-up transformer,…

  • INTRODUCTION

    INTRODUCTION

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    Transformer is considered to be a backbone of a power system. One of the main reasons of adopting alternate current (AC) system instead of direct current (DC) system for generation, transmission, and distribution of electric power is that the alternating voltage can be increased or decreased conveniently by means of a transformer. In fact, for…