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Monthly Archive for: «December, 2010»

Energy and Power

Characteristics of Lightning Strokes

Lightning, one of Mother Nature’s most spectacular events, started to appear significantly demystified after Franklin showed its electric nature with his famous electrical kite experiment in 1752. Although a great… Read more

Dec 19, 2010 | By Edvard

Characteristics of Lightning Strokes
High Voltage

Basics Of Subtransmission Systems

Subtransmission systems are those circuits that supply distribution substations. Several different subtransmission systems can supply distribution substations. Common subtransmission voltages include 34.5, 69, 115, and 138 kV. Higher voltage subtransmission… Read more

Dec 17, 2010 | By Edvard

Transmission Lines
Maintenance

Maintenance for UPS systems

Maintenance of the UPS consists of preventive and corrective maintenance. Preventive maintenance consists of a scheduled list of activities. Performing these activities keeps the UPS in good working order and… Read more

Dec 16, 2010 | By Edvard

Maintenance for UPS systems
Solar Power

Solar Power Tower

Solar power towers generate electric power from sunlight by focusing concentrated solar radiation on a tower mounted heat exchanger (receiver). The system uses hundreds to thousands of sun-tracking mirrors called… Read more

Dec 15, 2010 | By Edvard

Electric Motor

Keeping Motor Windings Dry

Special provision should be made to protect motor windings which operate in a damp atmosphere or are subject to condensation of moisture when out of service for long periods. Motors… Read more

Dec 14, 2010 | By Edvard

AC motor stator windings
Low Voltage

Forms of Separation (2) – Fundamentals

In accordance with the Standard, separation of the various elements of an Assembly: busbars, functional units, terminals, can be claimed providing one or more of the following criteria are met:… Read more

Dec 13, 2010 | By Edvard

Forms Of Separation - Introduction
Cables

Shielding Of Power Cables

Medium and high-voltage power cables, in circuits over 2000 volts, usually have a shield layer of copper or aluminum tape or conducting polymer. If an unshielded insulated cable is in… Read more

Dec 12, 2010 | By Edvard

Shielding of power cables
Hydropower

Hydro vs. Wind vs. Solar Power?

Matthew Stein, author of When Technology Fails: A Manual for Self-Reliance, Sustainability, and Surviving the Long Emergency wrestles with that very question in his book. Here’s an excerpt: No single… Read more

Dec 11, 2010 | By Edvard

Hydro vs. Wind vs. Solar Power?
Energy and Power

Sources Of The Electric Energy – Generation

There are a number of ways to produce electricity, the most common commercial way being the use of a synchronous generator driven by a rotating turbine. The combination is called… Read more

Dec 10, 2010 | By Edvard

Wind Power Turbine Diagram
High Voltage

IEC 62271-200 – HV Switchgear And Controlgear

Part 200: AC metal-enclosed switchgear and controlgear for rated voltages above 1 kV and up to and including 52 kV Switchgears are important nodal points in modern power distribution. Correspondingly… Read more

Dec 09, 2010 | By Edvard

IEC 62271-200
Energy and Power

Historical Review of Power System Stability Problems

As electric power systems have evolved over the last century, different forms of instability have emerged as being important during different periods. The methods of analysis and resolution of stability… Read more

Dec 08, 2010 | By Edvard

Historical Review of Power System
Energy and Power

Time-Current Curves explained in details

Time-current curves are used to show how fast a breaker will trip at any magnitude of current. The following illustration shows how a time-current curve works. The figures along the… Read more

Dec 07, 2010 | By Edvard

Time-Current Curves
Energy and Power

Economic advantages of power factor correction

Power supply authorities apply a tariff system which imposes penalties on the drawing of energy with a monthly average power factor lower than 0.9. The contracts applied are different from… Read more

Dec 04, 2010 | By Edvard

Economic advantages of power factor correction
Low Voltage

Forms of Separation (1) – Introduction

Standard BS EN 60439 Part 1, describes a system for classifying the various forms of separation to be provided principally for: protection against contact with live parts belonging to the… Read more

Dec 04, 2010 | By Edvard

Forms Of Separation - Introduction


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