Electrical Grid

Definition: Electrical grid or power grid is defined as the network which interconnects the generation, transmission and distribution unit. It supplies the electrical power from generating unit to the distribution unit. A large amount of power is transmitted from the generating station to load centre at 220kV or higher. The network form by these high…

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Metal Oxide Surge Arrester

Definition: The arrester which uses zinc oxide semiconductor as a resistor material, such type of arrester is known as a metal oxide surge arrester or ZnO Diverter. This arrester provides protection against all types of AC and DC over voltages. It is mainly used for overvoltage protection at all voltage levels in a power system.…

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Overhead Ground Wire or Earth Wire

Definition: The overhead earth wire or ground wire is the form of lightning protection using a conductor or conductors. It is attached from support to support above the transmission line and well grounded at regular interval. The earth wire intercepts the direct lightning strikes, which would strike the phase conductors. The ground wire has no effect…

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Electricity Tariffs

Definition: The amount of money frame by the supplier for the supply of electrical energy to various types of consumers in known as an electricity tariff. In other words, the tariff is the methods of charging a consumer for consuming electrical energy. The tariff covers the total cost of producing and supplying electric energy plus…

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Electrical Insulating Material

Definition: The material which does not allow the electricity to pass through them is known as an electrical insulating material. The charge of the insulating material does not move freely, or in other words, it provides the high resistive path to the electric current through which it is nearly impossible for the electric current to…

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Pin Insulator

The pin insulator is used in power distribution for the voltage up to 33kV. It is placed on the cross arm of the supporting tower. The pin insulator has grooves on the upper end for keeping the conductor. The conductor is tied to the insulator on the top groove on straight line positions and side groove in…

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String Efficiency of Suspension Insulator

When the voltage is applied across the suspension insulator string, it is unequally distributed across the individual unit. The disc near the line conductor is extremely stressed and takes the maximum voltage in the absence of stress. The voltage distribution on insulator string determines the flashover voltage and the voltage at which the localised corona…

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Suspension Insulator

The suspension insulator separates the line conductors and supports them electrically. It consists the number of porcelain insulator units connected with each other by metal links to form a flexible string. The conductor is connected at the bottom of the string. The suspension insulator is shown below. Advantages of Suspension Type Insulator The suspension type…

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Chopper Control of Separately Excited DC Motor

The chopper converts the fixed DC voltage to variable DC voltage. Self-commutated devices (directly on or off devices via gate) like MOSFET, IGBT, power transistors, GTO and IGCT are used for making choppers because they can be commutated by low power control signal and do not need commutation circuit. The chopper was operated at high…

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Switchgear

Definition: The apparatus used for controlling, regulating and switching on or off the electrical circuit in the electrical power system is known as switchgear.The switches, fuses, circuit breaker, isolator, relays, current and potential transformer, indicating instrument, lightning arresters and control panels are examples of the switchgear devices. The switchgear system is directly linked to the supply…

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