Electrical Machine

What is Induction Generator? Working, Diagram, Characteristics & Applications

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 […]

What is Induction Generator? Working, Diagram, Characteristics & Applications Read More »

What is Double Cage Induction Motor? Working, Construction, Diagram & Characteristics

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

What is Double Cage Induction Motor? Working, Construction, Diagram & Characteristics Read More »

What is an Autotransformer? Working Principle, Construction, Types & Applications

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 Transformer – Working, Diagram, Types & Applications

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

Tap Changing Transformer – Working, Diagram, Types & Applications Read More »

Sumpner’s Test (Back to Back Test) of Transformer

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

Sumpner’s Test (Back to Back Test) of Transformer Read More »