December 3rd

Predictive Maintenance - The Key to Power Quality

When PQ problems become apparent – usually in the form of a disruption – they are usually referred to as ‘events’. This terminology is misleading because it hides the fact that the causes of many ‘event’ could have been identified in advance by the use of predictive maintenance techniques. This Application Note proposes that, rather than simply responding to problems, PQ should be continuously monitored as part of a planned maintenance activity.

Read full article

Flicker

Flicker is the impression of unsteadiness of visual sensation induced by cyclic variation in the intensity or spectral content of a light source due to fluctuation of the supply voltage. It does not have any important effect on equipment, but it affects the concentration and productivity of people.

Read full article

Introduction to Unbalance

Unbalance can be caused by the presence of single-phase generators, such as photovoltaic units, unbalanced impedance of the distribution system, due to geometric effects, and unequal loading of the phases. Unbalance can have a serious effect on the performance and energy efficiency of three-phase equipment such as induction motors, transformers and electronic converters. In most circumstances, serious unbalance can be avoided by good installation practice, but some loads, such as railways, require special attention.

Read full article

Introduction to Voltage Dips

This Application Note discusses the causes and effects of voltage dips. Some dips are caused within the installation by, for example, starting of heavy motors or other loads, and these are usually easy to identify and resolve. Most dips originate in the supply network as the result of faults and these can neither be predicted nor controlled by the user. The causes and characteristics of network dips are discussed.

Read full article

Survey of Regulatory and Technological Developments Concerning Smart Metering in the European Union Electricity Market

Jorge Vasconcelos, Florence School of Regulation

Read full article

December 2nd

Energy Efficiency in Lighting Webcast

This new webcast, prepared by Laborelec for Leonardo ENERGY, discusses the basic principles of artificial lighting, light sources and armatures in relation to energy efficiency in lighting systems.

Read full article

Energy Project Analysis with RETScreen

RETScreen International is a unique decision support tool developed with the contribution of numerous experts from government, industry, and academia. Over the coming months, Leonardo ENERGY will be publishing a series of webcasts on energy project analysis using RETScreen.

RETScreen 4: Overview and Introduction

Read full article

November 27th

Kyoto target achievable for EU-15

But use of Kyoto mechanisms and carbon sinks required

There has been a lot of buzz in recent years about the EU-2020 emission reduction targets. So much in fact, that we might quite easily forget that the first Kyoto goal set by the European Union has still not been achieved - the final date for that goal is 2012. This goal was established for the EU-15 and not for the EU-27 as are the 2020 targets. It prescribes an average annual emission level of -8% compared to the base year for the period from 2008 to 2012.

Read full article

November 26th

Protecting Power Transformers From Common Adverse Conditions

Ali Kazemi, Schweitzer Engineering Laboratories, Inc.
Casper Labuschagne, Schweitzer Engineering Laboratories, Inc.

Read full article

November 20th

How green is clean power?

The problem of additionality

Green electricity sold by utility companies is a peculiar product. It guarantees the origin of your power, just like an ethical investment fund guarantees the origin of your profit, but what is the solid evidence for such a guarantee?

Read full article

Pages

Follow us