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Technical Articles

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 | Electric Motor

AC motor stator windings

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 | Low Voltage

Forms Of Separation - Introduction

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 | Cables

Shielding of power cables

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 | Hydropower

Hydro vs. Wind vs. Solar Power?

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 | High Voltage

IEC 62271-200

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 | Energy and Power

Time-Current Curves

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 | Energy and Power

Economic advantages of power factor correction