Technical articles on Electronics and Electrical Engineering topics focused on Basics of EE, Electronic components, power systems and equipment used for generation, transmission, operation, and controls of electricity.
On the basis of number of phases transformers can be categorized either as single phase or three. A single-phase transformer comprises of a single-phase primary and a single-phase secondary placed with either core or shell-type construction. On the other hand three phase transformer has three-phase primary and three-phase secondary that is placed with either core … Read more
Electrical transformers are often classified into two categories based on the construction of their core. There are two types of transformers in this regard: Core type transformers and Shell type transformers. The core-type transformer involves construction in which windings encircle the core. While shell-type construction involves construction in which the core encircles the winding. Given … Read more
The specific electric loading is abbreviated as AC in italics ‘ac’ and it is defined as the RMS ampere conductors per meter of armature periphery at the air gap surface. Mathematical formula for ac: ac= (Total number of armature ampere conductors)/(Armature periphery at air gap) The selection of a particular value of specific electric loading … Read more
The air gap in three-phase induction motors impacts the performance of the machine. Air gap length is usually abbreviated by l with subscript g. That is lg Formula to find the air gap length Where: D = Diameter in meters L = Length in meters Power Factor The air gap and power factors are inversely … Read more
The single-phase induction motors are generally classified into six categories. Split Phase Induction Motors Split phase induction motors are single phase motors that comprise of an auxiliary winding in addition to main winding in stator. The main winding is available during running and is given the name running winding. The major purpose of auxiliary winding … Read more
The magnetic flux density expressed in Tesla is a vector quantity and it is defined as the force acting per unit current per unit length on a wire placed at right angles to the magnetic field. The magnetic flux density is indicated using symbol B. Both magnetic flux density and magnetic field intensities are linked … Read more
On the basis of voltage ratio, transformers are divided into two categories: Step up and step-down transformers. Step up Transformer Step down Transformer Used to increase (step up the voltage) Used to decrease the voltage (step down the voltage) With the increase in voltage, there is a corresponding decrease in current With the decrease in … Read more
The term economical transmission voltage refers to the transmission voltage for which the cost of electric power conductors, insulators, power/distribution/transformer transformers, switchgear, and other terminal apparatus is lowest.
In electrical transformers, the term bushing refers to the hollow electrical insulator that allows electrical conductor cable to pass safely through a conducting barrier without making electrical contact with the transformer or ground. The role of busing is to prevent the occurrence of flashover from the connection of high voltage to an earthing point. The … Read more
The efficiency of a generator is defined as the ratio of power output in watts to power input in horsepower. The mathematical formula expression of generation efficiency is as follows: Where Pout = Power output in watts Pin = Power input in horsepower Eff (%) = Percentage Efficiency Example Problem Example The power output of … Read more