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Monthly Archive for: «August, 2012»

Smart Grid

Smart grid deployment, what we’ve done so far

The many smart grid technology areas – each consisting of sets of individual technologies – span the entire grid, from generation through transmission and distribution to various types of electricity… Read more

Aug 14, 2012 | By Edvard

Smart grid technology areas
Electrical Lectures

Electric Shock Current, Where Does It Go?

As we’ve already know, electricity requires a complete path (circuit) to continuously flow. This is why the shock received from static electricity is only a momentary jolt: the flow of… Read more

Aug 13, 2012 | By Edvard

Electric shock current, where does it go?
Protection

Delayed Auto-Reclosing On EHV Systems

On highly interconnected transmission systems, where the loss of a single line is unlikely to cause two sections of the system to drift apart significantly and lose synchronism, delayed auto-reclosing can be employed…. Read more

Aug 11, 2012 | By Edvard

Delayed auto-reclose scheme logic
High Voltage

Primary Distribution Voltage Levels

Most distribution voltages are between 4 and 35 kV. In this article, unless otherwise specified, voltages are given as line-to-line voltages; this follows normal industry practice, but it is sometimes… Read more

Aug 10, 2012 | By Edvard

Primary Distribution Voltage Levels
High Voltage

The Structure Of Power System

An interconnected power system is a complex enterprise that may be subdivided into the following major subsystems: Generation Subsystem Transmission and Subtransmission Subsystem Distribution Subsystem Utilization Subsystem Generation subsystem includes… Read more

Aug 09, 2012 | By Edvard

The structure of power system
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)


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