Tricky but Easy Electrical Engineering!
As we know that, the configuration of Armature and Field Winding is reverse in Synchronous Machine compared to DC machine i.e. Armature is on stator and field winding is on rotor unlike DC machine where it is opposite. In alternator the rotor part constitutes field winding so if we give DC supply to field winding … Read more
The basic difference between induction motor and synchronous motor is that induction motor is an asynchronous machine whereas the other one, as the name suggests is a synchronous machine. Following are some important differences between Synchronous Motor and Induction Motor: Synchronous motors operate at synchronous speed (RPM=120f/p) while induction motors operate at less than synchronous … Read more
Linear Induction Motor (LIM) is an asynchronous motor, working on the same principle an Induction Motor works, but is designed to produce the rectilinear motion, unlike the rotary movement produced by a motor; hence the word Linear Induction Motor. LIM is an advanced version of rotary induction motor which gives a linear translational motion instead of … Read more
Transformer noise is caused by a phenomenon which causes a piece of magnetic sheet steel to extend itself when magnetized. When the magnetization is taken away, it goes back to its original condition. This phenomenon is scientifically referred to as Magnetostriction. A transformer is magnetically excited by an alternating voltage and current so … Read more
Conservator is a cylindrical tank mounted on supporting structure on the roof of the transformer’s main tank. Function: When transformer is loaded and when ambient temperature rises, the volume of oil inside transformer increases. A conservator tank of transformer provides adequate space to this expanded transformer oil. It also acts as a reservoir for transformer … Read more
In any electrical system, we do the neutral grounding at the power source e.g. the star-points of generators or transformers. By keeping the grounded neutrals at the power source, earth fault current will have a return path from the point of short-circuit at downstream to the source. In this way the direction of earth fault … Read more
There are two types of Losses in an Electrical Machine. They are Core Loss or Iron Loss Ohmic Loss or Copper Loss In this post we will discuss about Core Loss. Core Loss is again classified into two types: Hysteresis Loss Eddy Current Loss First we will have a look at how the core of … Read more
For Cars, Trucks, Buses, Trains, and even Ships, the main engineering requirement is that they all need a certain torque at a certain speed at a given instant of time. The Petrol or Diesel Engine is not able to provide that required torque at a particular speed; it has different Torque/Speed Characteristics. The need … Read more
Doubly-fed Induction Generators in industry are used to generate electrical power in large wind turbines. This is primarily due to the many advantages of Doubly-fed Induction Generators than other types of generators in applications where the mechanical power provided by the prime mover driving the generator varies greatly e.g. wind blowing at variable speed on … Read more
Harmonics in the excitation current of Transformer is due to Hysteresis. As we know the relationship between Magnetic Flux Density, B and Magnetic Field Intensity, H is not linear as shown in figure below. Also, B = Flux (Ø) / Area (A), and H = NI where N = Number of turns and I = … Read more