Synchronous Machine

For better understanding of advantages and disadvantages of Short-pitched winding, we shall first understand the meaning of short-pitched coil and full-pitched coil. It will take some 10 minutes of your precious time to go through the write-up but it will really help you.Full Pitch Coil:A full pitched coil is defined ...
Read More
The rating of AC Machines such as Transformer, Alternators etc. are determined by the heating and hence losses in them. These losses are made up of Ohmic (I2R loss ) and Core Loss and a small amount of friction & windage loss. The ohmic loss depends upon the current and ...
Read More
Brushless Excitation System is a technology for providing the field current to the Synchronous Generator without using Slip Ring and Carbon Brushes. As this method of Excitation i.e. Brushless Excitation System do not use Carbon Brushes, therefore the losses because of contact resistance of carbon brushes is eliminated.Also, in case ...
Read More
Generator, Generator Transformer and Unit Transformer protections have been classified into Class-A, Class-B and Class-C. Class-A tripping is further classified into Class-A1 and Class-A2. Class-A, Class-B and Class-C Tripping Classification of Generator is based on the need of isolation of Generator on the basis of type of fault. In this post we ...
Read More
Dead Machine Protection of Generator ensures that Generator is not energized accidentally in standstill condition or when the Generator is on Turning Gear. Accidental energization of Generator when the machine is not running can cause severe damage to the machine, thus Dead Machine Protection becomes important to consider. (How? You will ...
Read More
We are quite familiar with Synchronous Generator or often called Alternator. There are mainly two types of Synchronous Generator from rotor construction point of view. The two main types of synchronous machine are Cylindrical Rotor and Salient Pole. Saliency simply means projection outward. Therefore from the literal meaning of Saliency ...
Read More
A Squirrel Cage Induction Motor (SCIM) only has a cage rotor winding, whereas a synchronous machine has both a cage (damper) and a wound DC field winding as shown in figure below.Synchronous Motor with Damper Winding:Squirrel Cage Induction Motor:In both cases, and when using only the cage winding, both motors ...
Read More
Equal Area Criterion is the method of studying the Transient Stability of system of two machines or single machine connected to infinite bus. The study of Transient Stability tells us whether or not synchronism is maintained i.e. whether or not load angle δ settles down to steady state stable value ...
Read More
In this post we will discuss about how to eliminate or suppress the harmonics from the emf waveform of an Alternator. In an Alternator, the primary source of harmonics in the emf waveform is due to non sinusoidal field waveform. If the field waveform would have been sinusoidal then there ...
Read More
A Synchronous Machine is named Synchronous because the speed of Rotor is equal to the speed of rotating field. The speed of rotating field is determined by the supply frequency and the number of poles in the machine and knows as Synchronous speed. Any deviating in the speed of rotor ...
Read More