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Monthly Archive for: «February, 2012»

Why do we find electric motor drive very important?

Electric motors impact almost every aspect of modern living. Refrigerators, vacuum cleaners, air conditioners, fans, computer hard drives, automatic car windows, and multitudes of other appliances and devices all use electric motors to convert electrical… Read more

Feb 29, 2012 | Edvard

Capacitor banks in power system (part 1)

When a charge is delivered to a conductor its potential is raised in proportion to the quantity of charge given to it. At a particular potential a conductor can hold a given amount of charge…. Read more

Feb 27, 2012 | Asif Eqbal

Capacitor banks in power system (part 1)

Under the Hood of Light Detector

Detectors of electromagnetic radiation in the spectral range from ultraviolet to far infrared are called light detectors. From the standpoint of a sensor designer, absorption of photons by a sensing material may result either in… Read more

Feb 24, 2012 | Edvard

Light Detectors - Introduction And Purpose

Zero Emission Power Plant, Without Carbon Dioxide

India is the world’s fourth largest economy and has a fast growing energy market. India’s current power capacity is 30% short of demand. Coal and petroleum are the primary sources of energy. High ash content… Read more

Feb 22, 2012 | vinod ramireddy

Zero emission power plant

Voltage Instrument Transformer (VT) – Introduction

Instrument transformers are primarily used to provide isolation between the main primary circuit and the secondary control and measuring devices. This isolation is achieved by magnetically coupling the two circuits. In addition to isolation, levels… Read more

Feb 20, 2012 | Edvard

Voltage Transformer (VT) - Introduction And Purpose

220V DC system at thermal power station

The 220V DC system supplies direct current as source of operating power for control, signaling, relays, tripping and closing of switchgears, emergency motors of most important auxiliary systems. Under normal conditions of station generation, the… Read more

Feb 15, 2012 | Bipul Raman

220V DC system at thermal power station

Protection Of Generators And Transformers

As Generators and transformers are major components of a power system, so it is quite necessary to take all the preventive measures for the protection of transformers and generators. These are the following ways (ANSI… Read more

Feb 11, 2012 | Bipul Raman

Protection of generators and transformers (Siprotec numerical protection relays)

Types of neutral earthing in power distribution (part 2)

Resistance grounding has been used in three-phase industrial applications for many years and it resolves many of the problems associated with solidly grounded and ungrounded systems. Resistance Grounding Systems limits the phase-to-ground fault currents. Continued… Read more

Feb 09, 2012 | jiguparmar

Low voltage switchgear - Power distribution

Discussing About LV And HV Electrical Cables

Space is really a critical criterion when discussing electrical cables and wires. In a low-voltage (LV) plastic-sheathed cable with conductor cross-sections of up to 10 mm2 per conductor or in high-voltage (HV) cables (Figure 2),… Read more

Feb 08, 2012 | Edvard

High-voltage cable cross section

Purpose and maintenance of transformer bushings

The two most common types of bushings used on transformers as main lead entrances are solid porcelain bushings on smaller transformers and oil-filled condenser bushings on larger transformers. Solid porcelain bushings consist of high-grade porcelain… Read more

Feb 05, 2012 | Edvard

Transformer porcelain bushings spare parts


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