Split Phase Induction Motor
This type of motor has single phase stator winding called main winding. In addition to this, stator carries one more winding called…
Parallel Operation Of Single-Phase Transformer
It is required to connect a second transformer in parallel with the first transformer if the load exceeds the rating of the…
All-Day Efficiency
The ratio of output in watts to input in watts is called commercial efficiency of a transformer. Distribution transformers are used for supplying lighting…
Concentric Windings In Transformer
Figure 1.10 Concentric Windings Concentric windings are classified into four following groups: (i) Spiral windings. (ii) Helical windings. (iii) Cross-over windings. (iv) Continuous…
Sumpner’s Test
To determine the rise of maximum temperature of a transformer, its load test is of utmost importance. Using suitable load impedance, small…
Transformer Oil
Transformer oil is a mineral (clean hydrocarbon) oil, which is obtained by refining crude petroleum. It has the following purposes: It provides…
Transformer Windings
There are two types of windings usually used in a transformer. The winding receiving electrical energy is known as primary winding, whereas…
Working Principle Of 1-Phase Induction Motor
For the motoring action, there must exist two fluxes which interact with each other to produce the torque. In d.c. motors, field…