Power System

Auto Reclosing of Power Lines and Types of Faults

The auto reclosing of power lines has become a generally accepted practice. Reports from different parts of the world show ...
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Square D QO Circuit Breakers

QO stands for Qwik-Open. Square D QO Circuit Breakers are fastest tripping circuit breakers at 1/60th of a second. QO™ ...
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Bundled Conductors in Transmission Lines

Bundled conductors are commonly used to increase electrical capacity and reduce corona and radio noise at voltages above 200 kV ...
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Measurement of Three Phase Power | Wattmeter Methods

This article explains the measurement of three-phase power in star connected or delta connecter load using the wattmeter methods. The ...
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Types of Underground Cables

In practice, different types of underground cables are generally required to deliver 3-phase power. For the purpose, either three-core cable or ...
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What is Circuit Breaker – Working Principle and Arcing Phenomenon

What is a Circuit Breaker? As the name indicates, circuit breaker means the device which breaks (Open) the circuit under the ...
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What is an HVDC (High Voltage Direct Current) Transmission System?

HVDC stands for High Voltage Direct Current. An HVDC electric power transmission system uses direct current for the bulk transmission of ...
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4 Major Types of Electrical Substations

The assembly of the apparatus used to change some characteristic (e.g. voltage, a.c. to d.c., frequency, p.f etc.) of ...
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Classification or Types of Protective Relays

The IEEE defines protective relays as: “relays whose function is to detect defective lines or apparatus or other power system ...
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Voltage Surge in Power System

What is Voltage Surge or Transient Voltage? The sudden rise in voltage for a very short duration on power system ...
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Why Voltage Control is Important?

In a modern power system, electrical energy from the generating station is delivered to the ultimate consumers through a ...
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Why Current Transformer (CT) Seconday Should not be Open ?

Amazed why secondary of current transformer should not be open? If it is left open it may destroy the current ...
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Properties of Good Transformer Oil

Even though the basic functions of the oil used in transformers are heat conduction and electrical insulation, there are many other properties which ...
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Percentage Impedance of Transformer and Its Calculation

What is Percentage Impedance? The impedance of a transformer is the total opposition offered an alternating current. This may be ...
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What are Motor Control Centres?

The terms ‘Switchgear’ and ‘Motor Control Centres’ are used in general to describe combinations of enclosures, busbars, circuit breakers, power ...
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