November 26th, 2014

Voltage Fluctuations in Power Networks ("flicker")

Voltage fluctuations are series of voltage changes, or variations of the voltage waveform. The ratio of reactive power to the short circuit capacity is a simplified formula to calculate relative voltage fluctuations at the load end of a High Voltage (HV) supply system.

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November 21st

Saving energy in schools

The implementation of some simple energy-saving measures in schools can reduce energy consumption, save money, improve conditions for staff and students, and cut carbon emissions.

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November 18th

Integrated Home Systems - Chapter 5 - Structured Cabling

It used to be a lot easier. It used to be that 230V cabling would be laid in the newly built home, to which a few sockets, power points and switches were connected. At most, there was also a telephone socket in the wall and a coax cable connection for the television. A small distribution board was sufficient to protect a few socket circuits and lighting circuits. The installation was ready.

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Lighting tutorial

Modern dimmable electronic ballasts provide excellent versatility for lighting scenes in conference rooms, theatres and the like where magnetic ballasts cannot compete, although a new technique to make magnetic ballasts dimmable is presently under development in Canada but not yet available on the market (for news on this see here).

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November 15th

A compendium on the many benefits of energy efficiency

Traditionally the benefits of energy efficiency have been focused on energy demand reduction and lower greenhouse gas emissions. However, there are many other areas in which clear benefits of energy efficiency have been documented.

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November 7th

Mitigation of voltage unbalance

When the limit values of unbalance factor, specified in standards are exceeded, the use of symmetrizatin systems is required. A symmetrizator should not cause significant active power losses during operation, it implies that the symmetrization process shall be carried out by means of reactive elements (LC) or using active methods (power electronic systems). In this step by step guide, you will learn how to solve unbalance issues.

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Voltage change during drive start

In this guide, a design engineer works on a converter drive design and determines the voltage change coefficient during the drive start, compares it to permissible levels and suggests solutions to have it satisfying the limit.

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Permissible level of voltage fluctuations for a motor

In this guide, a design engineer has to advise his industrial customer who plans to connect a new induction motor to the power supply system. Using the permissible level of voltage fluctuations, his methodology is described.

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Designing an Uninterruptible Power Supply

A company specialized in uninterruptible power supply systems developed and manufactured in 2006 a system comprising a 400kVA UPS unit.

The system was installed in a production facility manufacturing food packaging equipment and foil, located in northern Poland.

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October 29th

New loads on old switches, relays and contactors

While power electronics is continuously superseding the traditional “hardware” solutions in electrical engineering, common mechanical contacts still remain important constituents of any electrical power distribution system. A survey of the types of switches, relays and contactors, their properties and areas of application will be given. Further, a detailed overview shall draw a picture of the impact caused by new electronic types of loads upon these conventional mechanical contacts.

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