Linear Induction Motor (LIM) is an asynchronous motor, working on the same principle an Induction Motor works, but is designed to produce the rectilinear motion, unlike the rotary movement produced by a motor; hence the word Linear Induction Motor. LIM is an advanced version of rotary induction motor which gives a linear translational motion instead of … Read more Linear Induction Motor
Servomechanism is a powered mechanism producing motion or forces at a higher level of energy than the input level, e.g. in the brakes and steering of large motor vehicles, especially where feedback is employed to make the control automatic. A servomechanism, sometimes also called Servo, is an automatic device that uses error-sensing negative feedback to … Read more Basics of Servomechanism and Servo Motor
Enhancement Mode MOSFET: For an enhancement MOSFET, the channel does not initially exist. It only comes into existence once a voltage greater than Vth, threshold voltage is applied. For example, in an n-channel MOSFET, the substrate is made of p-type material. Consider the source to be at a reference ground potential of 0 Volts. For … Read more Difference between Depletion-mode MOSFET and Enhancement-mode MOSFET
In conductors i.e. metals the electrons that conduct current are called Itinerant electrons. They are essentially free to move around the metal, not bound to any particular atomic core. Resistivity can be understood as Itinerant electrons scattering off of Phonons, or thermal lattice vibrations, in a conductor. As the temperature of the metal increases, the … Read more Resistance of Semiconductors and Conductors as a Function of Temperature
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 Insulator Failures – An Overview
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 Different Type of Insulators Used in Power System
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 Difference between Current Transformer & Potential Transformer
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 Why do Transformers Hum?
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 Why is Power Transmitted at Low Frequency and not at High Frequency?
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 Relationship between Power Factor and Losses