Tricky but Easy Electrical Engineering!
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 the core loss depends upon … Read more
Open Circuit Test and Short Circuit Test are performed on a Synchronous Machine to find out the parameters of Synchronous Machine and hence to have an idea of their performance. Open Circuit Test of Synchronous Machine is also called No Load, Saturation or Magnetizing Characteristics for the reason which will be clear after going through … Read more
The transformer which handles voltages and currents in the form of pulse are called Pulse Transformer. Pulse Transformer is mostly used in Power Electronic circuits as an Isolating Transformer to isolate source and load. It is also used in television, radar, digital computers etc. The main functions of the Pulse Transformer are as below: 1) … Read more
What is SATACOM? STATCOM or Static Synchronous Compensator is a power electronic device using force commutated devices like IGBT, GTO etc. to control the reactive power flow through a power network and thereby increasing the stability of power network. STATCOM is a shunt device i.e. it is connected in shunt with the line. A Static … Read more
This article outlines the Load Test of Transformer. Load Test of Transformer is also known as Back to Back Test or Sumpner’s Test. Load Test of a Transformer is basically carried out for determining the maximum temperature rise of the Transformer. However is not viable to conduct this test by connecting the secondary of the … Read more
Stray Load Loss: As we know that, when an electrical machine is loaded, load current flowing in the armature winding of the machine produces an mmf which distorts the space distribution of mmf produced or set up by the field winding in the air gap. This distortion of space distribution of mmf or flux density … Read more
It is a well known fact that, space harmonic present in the rotating mmf wave in an uniform air gap Electrical Machine (Non Salient Pole machine) produces or generates only fundamental frequency voltage in the Stator winding of the machine. In this post we will discuss the reason behind this fact. As we know that … Read more
This is very basic but important concept to understand Electrical Machine. It is well known fact that, the number of stator and rotor poles must be equal for the production of net Electromagnetic Torque. In this post we will discuss the reason behind this. Let us consider an Electrical machine having 2 Stator Poles and … Read more
Electrical and Mechanical angles are frequently used in the study of Electrical Machine theory and therefore it is very important to have a crystal clear concept of these two terms and the relationship between them. In this post we will also discuss about the Synchronous Speed and their relationship with Electrical and Mechanical angle. As … 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 one can guess that Salient … Read more