Electrical Machines

EMF Equation of Transformer - Turn & Transformation Ratio

A Transformer is a static device which works on the principle of "Magnetic Induction". When an alternating supply is given to its primary winding a magnetizing current will circulate through the primary winding an…

Short Circuit Test or Impedance Test of Transformer

The performance or parameters of a transformer can be well determined by testing the transformer. In order to calculate the efficiency, regulation of the transformer various parameters like equivalent resistance and reactan…

Transformer ON Load Condition - Phasor Diagram & Operation

In the last article, we have seen the behavior of the transformer in the no-load condition. Let us check out the operation of the transformer, and how the transformer behaves when the load is connected across it. Operatio…

Phasor Diagram of Induction Motor

The induction motor and transformer both are singly energized devices. The stator and rotor of an induction motor can be compared to the primary and secondary windings of the transformer. Similarly, from the e.m.f. equation…

What is Tap-changing Transformer ? Off-load & On-load

In transmission and distribution systems there can be voltage fluctuations ( i.e., increase or decrease in voltage levels ) when the load on the system varies. These fluctuations can also be caused due to a voltage drop in …

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