Tricky but Easy Electrical Engineering!
It is generally considered that 500 kV is the most economical voltage level at which to transmit large quantities of electrical energy over long distances. The best material for insulating overhead lines has been found to be porcelain, as its insulating qualities remain practically the same when exposed to all weather conditions. It has low … Read more
The purpose of the insulator or insulation is to insulate the electrically charged part of any equipment or machine from another charged part or uncharged metal part. At lower utilization voltage the insulation also completely covers the live conductor and acts as a barrier and keeps the live conductors unreachable from human being or animals. … Read more
To have a clear understanding of why do we use low frequency i.e. 50 / 60 Hz for Electrical Power Transmission, we will first consider some points. GENERATION: Power is generated from Synchronous machines i.e. Alternators which rotate at a particular speed called the synchronous speed given by Ns= 120f /P and the frequency is … Read more
As we know that power factor is the ratio of the actual power being consumed by an appliance to the apparent power it draws from the source. Now, we may wonder that how does this difference between apparent and actual power arise? Well, if we take a purely resistive circuit, the power factor will … 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
What is Bundle Conductor? A bundle conductor is a conductor made up of two or more sub-conductors and is used as one phase conductor. For voltages greater than 220 kV it is preferable to use more than one conductor per phase which is known as Bundle conductor. Bundle Conductor Bundle conductors are used for transmission … Read more
When in an insulation system, the voltage gradient exceeds a critical voltage, the air molecules surrounding the high voltage transmission line conductors become ionized resulting in partial discharges. Corona loss occurs if the line to line voltage exceeds the corona threshold. The conductive region is not high enough to cause electrical breakdown or arcing to … Read more
Electric traction means using the electric power for traction system i.e. for railways, trams, trolleys etc. Now a day, magnetic traction is also used for bullet trains. How does Electric Traction Work? Block Diagram: In OHE, or overhead electrification systems, the supply of electricity is through an overhead system of suspended cables known as … Read more
What is a Corona Ring? A Corona Ring is a circular conductive material, usually metal, which is attached to a terminal of high voltage equipment. The function of the Corona Ring is to distribute the electric field gradient and lower its maximum values below the corona threshold and thus preventing corona discharge. Corona Rings are … Read more
As we know that Power Output of an Alternator, P = EfVtSinδ/Xs Where Ef = No Load Voltage Vt = Terminal Voltage of Alternator δ = Load Angle Xs = Synchronous Reactance Thus it is clear that power output of an Alternator will be maximum if load angle δ is 90°. … Read more