Substation

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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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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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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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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Why we need Power System Protection?

It is fair to say that without discriminative protection it would be impossible to operate a modern power system. The ...
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Introduction to Gas Insulated Substations / Switchgears (GIS)

Gas insulated substations (GIS) have been used in power systems over the last three decades because of their high reliability, ...
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Low Voltage Switchgear

As per IEC 60947, switchgears with rated voltages up to 1000 V ac and 1500 V dc are termed as ...
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What is a FUSE and How it Works?

A fuse protects an electrical circuit or device from excessive current when a metal element inside it melts to create an ...
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Substation Earthing System Design

We have already given an introduction to substation earthing system in an article published earlier. Today we are going to ...
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IEC 61850 – Features and Advantages

Communication plays an important role in the real time operation of a power system. In the beginning, telephone was used ...
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Oil Circuit Breakers – Types, Working and Construction

In oil circuit breakers, some insulating oil (e.g., transformer oil) is used as an arc quenching medium. Working Principle of ...
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Circuit Breakers – Interview Questions with Answers

1. What is a Circuit Breaker?Circuit Breaker is a mechanical device designed to close or open contact members, thus closing ...
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Circuit Breaker – Design and Construction Basics

Related TopicsSwitchgear - ComponentsCircuit Breaker - OperationArching PhenomenonMethods of Arc ExtinctionTypes of Circuit BreakersOil Circuit BreakerAir Blast Circuit BreakerAir Circuit ...
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Corona Effect in Power System

What is Corona? The phenomenon of violet glow, hissing noise and production of ozone gas in an overhead transmission line is ...
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IEC 61850 – Substation Automation – Fundamentals

What is IEC 61850?IEC 61850 is a standard for the design of electrical substation automation. It is the base for ...
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Components of Switchgear

The apparatus used for switching, controlling and protecting the electrical circuits and equipment is known as switchgear. Switchgears are the switching ...
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What is Switchgear? | Features, Components and Classification

What is Switchgear? The apparatus used for switching, controlling and protecting the electrical circuits and equipment is known as switchgear. ...
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Breaker Failure Relay (Back-up Protection Relay)

Each year as line and system loading increase and more operating companies superimpose higher voltage transmission systems on existing facilities, ...
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Residual Current Protective Devices (RCCB & RCBO)

What is a RCD? A Residual Current Device (RCCB, ELCB, RCBO etc.) is a device that is designed to provide ...
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Moulded Case Circuit Breakers (MCCB) – Types and Working

Circuit Breakers – Objective Questions – Part 1

Part 1Part 2Part 3Part 4Part 51. A circuit breaker is(A) power factor correcting device(B) a device to neutralize the effect ...
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Working of Air Circuit Breakers

What is an ACB? A circuit breaker in which the contacts open and close in air at atmospheric pressure is ...
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Vacuum Circuit Breaker (VCB) – Principle, Construction and Working

What is VCB? VCB stands for Vacuum Circuit Breaker. In vacuum circuit breakers, the vacuum is used as the arc quenching ...
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MCB (Miniature Circuit Breakers) – Types, Working and Characteristics

What is MCB? MCB or Miniature Circuit Breaker is an electromechanical device which protects an electric circuit from an overcurrent. The ...
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SF6 (Sulphur Hexafluoride) Circuit Breakers – Construction and Working

In an SF6 Circuit breaker, sulphur hexafluoride gas is used as the arc quenching medium. The sulphur hexafluoride gas (SF6) is ...
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Substation – Design Criteria and Studies

The most appropriate type of substation depends on such factors as voltage level, load capacity, environmental considerations, site space limitations, ...
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Circuit Breaker Ratings

Lightning Arrester – Location, Rating and Selection

Overvoltages may cause burning of insulation of substation equipment if not well protected. Lightning is one of the most serious ...
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Circuit Breakers – Objective Questions – Part 2

Part 1Part 2Part 3Part 4Part 516. Out of the following circuit breakers, which one has the lowest voltage range ?(A) ...
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Air Blast Circuit Breakers – Classification and Working

Air blast circuit breakers employ a high-pressure air blast as an arc quenching medium. The classification and working of different ...
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Different Types of Circuit Breakers

The electrical circuit breaker is a switching device which can be operated manually as well as automatically for controlling and ...
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Methods of Arc Extinction in Circuit Breaker

The operating principle and arc forming phenomenon was explained in the previous article. Now it is very important to extinct ...
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Substation Earthing System ( Grounding System ) – Earthing Mat

The substation grounding system comprises of a grid (earth mat) formed by a horizontal buried conductors. Read about design of ...
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Capacitor Voltage Transformer (CVT or CCVT) – Construction and Working

Capacitor voltage transformer are used for line voltmeters, synchroscopes, protective relays, tariff meter, etc. A voltage transformer VT is a ...
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