Tricky but Easy Electrical Engineering!
We know that, induction motor is quite similar to a transformer; therefore the induction motor equivalent circuit should also be similar to that of a transformer. The only difference between them lies with the fact that, secondary winding i.e. rotor of induction motor rotates to give mechanical output whereas transformer is a static device. Thus … Read more
As we know that principle of induction motor is very similar to the transformer with some differences. An induction motor at standstill condition is similar to a transformer at no load condition. Therefore, the method of drawing the induction motor phasor diagram is also same as that of a transformer phasor diagram. In this post … Read more
Low power factor is mainly due to the inductive loads. In industries, mostly inductive loads are used like induction motors, lamps etc.for various purposes. These inductive loads take lagging current and hence results in low power factor. Low power factor has many disadvantages. Therefore, power factor improvement is necessary to get rid of problems associated … Read more
Transformer Equivalent Circuit is the electrical circuit representation of equations describing the behavior of Transformer. In fact equivalent circuit of any electrical device is necessary for its performance analysis and to find any scope of further design modification. The equivalent circuit of a transformer consists of a combination of resistance, inductance, capacitance, voltage etc. This … Read more
Out of all the electrical machines, Induction Motor is the most used machine in industries. More than 90% of motors used in industries are squirrel cage induction motor due to its rugged and maintenance free design. Generally an Induction Motor operates at almost constant speed as the load is varied. But in some industrial applications, … Read more
Stator Voltage Control of Induction Motor is a method for the speed control of induction motor by changing the stator terminal voltage. Stator terminal voltage in this method is changed either by adding a series resistor, series inductor or auto transformer in stator circuit. But addition of series resistance is quite inefficient due to losses … Read more
Slip in Induction Motor is the relative speed between the rotating magnetic flux and rotor expressed in terms of per unit synchronous speed. It is a dimensionless quantity. The value of slip in induction motor is can never be zero. If Ns and Nr being the synchronous speed of rotating magnetic flux and rotor speed … Read more
The main difference between step-up and step-down transformer is that, step-up transformer increases the voltage whereas a step-down transformer decreases the voltage. The secondary voltage of step-up transformer is more than that of its primary voltage whereas the secondary voltage of step-down transformer is less than its primary voltage. In fact, these two terms, i.e. … Read more
The main difference between Core type and Shell Type Transformer is the constructional difference of their core and winding arrangement. In core type transformer, the magnetic core consists of two limbs and two yokes whereas in Shell type transformer, there are three limbs and two yokes. Core Type Transformer: In core type transformer, the HV … Read more
Transformer is an electromagnetic device that transfers electric power from one circuit to another at a constant frequency. It step-up or step-down the voltage level from one circuit to another at almost constant power. As, voltage transformation take place at a constant power, there is a change in circuit current. For example, when transformer increase … Read more