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Archive: Category «Energy and Power»

Electric Motor

Basics of 3-phase Induction Motor (part 4)

When a motor is expected to operate in unfavorable conditions such as: Intermittent overloading Higher ambient temperatures A restricted temperature rise as for a spinning mill, A refinery or a… Read more

Aug 07, 2012 | By Asif Eqbal

1903 1/2hp Wagner repulsion start induction motor
Energy and Power

Principles of Transformers in Parallel Connection

For supplying a load in excess of the rating of an existing transformer, two or more transformers may be connected in parallel with the existing transformer. The transformers are connected… Read more

Aug 06, 2012 | By jiguparmar

Principles of Transformers in Parallel Connection (Part 1)
Energy and Power

Reliability of Compressed Air Energy Storage Plant

As the name implies, the compressed air energy storage (CAES) plant uses electricity to compress air which is stored in underground reservoirs. When electricity is needed, this compressed air is withdrawn,… Read more

Aug 04, 2012 | By Edvard

Compressed air energy storage (CAES) plant
Electric Motor

Basics of 3-phase Induction Motor (part 3)

Continued fro second part – Basics of 3-phase Induction Motor (part 2) Technical data to be specified by purchaser before purchasing a 3 phase induction motor: No. Technical data to… Read more

Aug 03, 2012 | By Asif Eqbal

Induction motor nameplate
Electric Motor

Basics of 3-phase Induction Motor (part 2)

Continued from first part – Basics of 3-phase Induction Motor (part 1) For the purpose of standardization, the preferred rated voltages of three phase induction motor shall be in accordance… Read more

Aug 02, 2012 | By Asif Eqbal

Basics of 3-phase Induction Motor (part 2)
Electric Motor

Basics of 3-phase Induction Motor (part 1)

This article will deal with those concepts of 3 phase induction motor which are essential prerequisite for proper selection, procurement, installation and maintenance of the same. Before any actual discussion… Read more

Aug 01, 2012 | By Asif Eqbal

Basics of 3-phase Induction Motor (part 1)
Cables

Sizing and protection of the neutral conductor (1)

Sizing (c.s.a.) and the protection of the neutral conductor, apart from its current-carrying requirement, depend on several factors, namely: The type of earthing system, TT, TN, etc. The harmonic currents… Read more

Jul 30, 2012 | By Edvard

Sizing and protection of the neutral conductor
Energy and Power

Overvoltages in the IT system

Electrical networks can be subject to overvoltages of varying origins. Some overvoltages, such as differential mode ones (between live conductors) affect all the earthing systems. This section is particularly concerned… Read more

Jul 26, 2012 | By Edvard

Single insulation fault on a network operated in IT earthed system
Energy and Power

Isolating the Fault With Time-based Discrimination

Protection functions form a consistent system depending on the overall structure of the power distribution system and the neutral earthing arrangement. They should therefore be viewed as a system based… Read more

Jul 22, 2012 | By Edvard

Isolating the Fault With Time-based Discrimination
Energy and Power

Bus Design In Aboveground Substations

Substations can be constructed partly or entirely within aboveground or belowground enclosures. However, cost is high and complexity is increased by fire-protection and heat-removal needs. The following discussion deals with… Read more

Jul 21, 2012 | By Edvard

Gas insulated switchgear (GIS) - Siemens


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