Electrical engineering BLOG

My office: a 100% intelligent building !

Francois — Wed, 24 Feb 2010 09:29:54 +0000

Hello, my name is Steve, I am the owner of a small company of 95 people. Since 1 year we have built a new office building fully automated: it’s great! I mean, both the working comfort and energy efficiency issues. Since our work in December 2008, we discovered the ease of use of everything that affects [...]

Photovoltaic reliability, using micro inverter

Francois — Tue, 23 Feb 2010 08:02:20 +0000

In my previous article I presented the principle for avoiding production losses when photovoltaic systems are located in such cases where there is shadow of trees, dust, chimneys, antenna, other buildings … We speak of photovoltaic shading. Then I presented a good solution to avoid these which is distributed MPP Tracking: one micro inverter per photovoltaic [...]

About Blog quality

Francois — Sun, 14 Feb 2010 13:59:24 +0000

I find interesting to summarize credibility basics in this Electrical Engineering Blog because i feel this seems to apply well to this Blog and also it may help all visitors, contributors and also the moderator team, to have a better understanding. I produced this information from a source given in Problogger site. 7 blog quality principles are [...]

7/8 – Electrical equipment: harmonic mitigation

Francois — Thu, 11 Feb 2010 11:30:10 +0000

How to achieve “harmonic mitigation” ? Several different solutions are proposed for Harmonic mitigation. The right choice is always dependent on a variety of factors, such as the activity sector, the applicable standards, the power level …. Several solutions are relative to Variable Speed Drives, as this type of electrical equipment represents a large part of the [...]

Photovoltaic systems using micro inverter ?

Francois — Thu, 04 Feb 2010 13:41:43 +0000

I will explain here the solutions and its principle for avoiding production losses when photovoltaic systems are located in cases where there is shadow of trees, dust, chimneys, antenna, other buildings or specific relief. The idea is to install one micro inverter per Photovoltaic module to track individual Maximum Power Point. I will detail 2 design approaches with their [...]

GPS synchronization for power system s

Francois — Wed, 27 Jan 2010 15:34:38 +0000

GPS time Synchronization: Power system reliability starts with precision timing. Precision timing is required for monitoring and control of electrical power networks where power system reliability is important. Circuit breaker control schemes require precise timing to ensure proper operation, and Sequence of Events Recording systems report events with one-millisecond precision to aid diagnostics and troubleshooting. Typical “critical [...]

Earthing system design

Francois — Fri, 22 Jan 2010 13:50:42 +0000

Electrical protection and lightning protection I have a query on earthing system design. One designer has submitted me an earthing plan which interconnects the earth electrodes meant for equipment earthing and those for lightning protection purposes. By combining the earth electrodes he achieves overall earth resistance below one ohm required by IS 3043 (Indian standard). But [...]

6/8 – Electrical equipment: improve power factor

Francois — Wed, 20 Jan 2010 08:34:53 +0000

How to improve power factor ? Power factor has been defined earlier as a function of active and apparent power. For sinusoidal (undistorted) voltage and current, a vector representation is also possible and helpful. For most electrical loads like motors, the current I is lagging behind the voltage V by an angle phi. Ia is called the “active” [...]

January 2010: call for donors

Francois — Mon, 11 Jan 2010 23:01:22 +0000

Our high visibility on the Web is rapidly increasing: our blog received 150,000 visits in 2009 and we are aiming at 300,000 for 2010! In 2010, many changes lie in store for us: 1. We are going to open up this blog to any interested donors. Our objective is to use the donations obtained to develop its audience [...]

Electrical Energy Efficiency

Francois — Fri, 08 Jan 2010 17:01:56 +0000

Introduction of Electrical energy efficiency in Low-Voltage electrical installations Draft for a new IEC standard At an hour when advices for energy efficiency are to be written, the challenge is to aim at completed general installations rules for electrical installations of buildings, in the way to obtain the highest possible service for the lowest energy consumption. This [...]