Tricky but Easy Electrical Engineering!
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
Current Transformer (CT) and Potential Transformer (PT) are instrument transformers basically used for measurement and protection purpose in power systems. A Current Transformer (CT) is used to obtain reduced current signals for purpose of measurement, control and protection. They reduce the higher current to lower values which are suitable for operation of Relays and other … 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
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
A Phase Imbalance Fault indication on a motor monitor means that the voltage and / or current in one phase winding of the motor is not the same as the other two phases by an amount that exceeds a settable maximum.This means something is wrong and need to be corrected. The most common reason for … 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