Autotransformer starter working pdf The squirrel cage induction motor started on full line voltage using D O L starter as a starting method draws a very large starting current which can damage motor winding and also create a current surge on the power system.…
There are different types of lightning arresters like Rod Gap Arrester, Horn Gap Arrester, Valve type, and expulsion type and they differ from each other only in construction details. but they operate on the same principle which is to provide…
A synchronous motor is a machine that rotates at a constant speed called synchronous speed and converts electrical power to mechanical power. Synchronous motors Starter winding fed with a three phase AC supply and field winding is excited using a…
How many types of DC links ? DC links are used to connect two different grids with different frequencies. To connect the grid three main types of DC links are used in HVDC Transmission. The type of dc-links are classified…
Grounding wire running over the tower or substation provides good protection to the electrical system against direct lightning stroke but they fail to provide protection against traveling high voltage or current waves that reach to terminal equipment. The lightning arrester…
The Scott connection of the transformer is a standard method of connecting two single-phase transformers to perform the three-phase to two-phase conversion and vice versa. Scott connection of transformer is also known as T – T connection. In Scott-T connection, two…
The working principle of the transformer is based on Faraday’s law of electromagnetic induction. The three-phase power transformer is the main device of every power system. the main function of transformer is to step up or step down the voltage…
A Slip Ring Induction Motor is a type of asynchronous induction motor. Slip ring induction motors rotor is wound identically to the stator and is connected through rotating electrical contacts known as slip rings. These slip rings let the induction…
Critical disruptive voltage is defined as the voltage at which complete disruption of the dielectric strength of air occurs. if the voltage increases above critical disruptive voltage corona occurs. 𝛿: air density correction factor r: radius of conductor d: distance of…
Corona effect (also known as Corona Discharge) is nothing but the ionization of air around the power conductor. The air around the power conductor has free electrons due to radioactivity and cosmic rays. As the potential between conductors increases potential gradient…