Electrical engineering Community

Energy management: enable every occupant to tailor his own dashboards

Laurent — Fri, 18 Jun 2010 09:19:36 +0000

Energy bill and carbon footprint are becoming increasingly important topics for commercial buildings. This trend started with large buildings but nowadays also small and medium size buildings occupants and owners are eager to reduce their energy bill and carbon footprint… and to show it to all their stakeholders. Devices and solutions providers are developing new features [...]

Surge protector in switchboards > 50kA ?

Laurent — Mon, 14 Jun 2010 08:26:30 +0000

I would like to share a problem I face when I have to install a surge protection device type 1 in high power electrical switchboard. I already asked this question on another blog, and I’m trying to get more feedbacks from electrical engineers. The situation is very “unconfortable” for me as a quality provider, because if [...]

High Voltage: circuit breaker is the best!

Laurent — Sun, 23 May 2010 22:20:17 +0000

Every time I hear or read something about high voltage fuses, I’m convinced that15 years ago in the UK, we made the right choice by moving away from high voltage fuses to circuit-breakers. If we take the first argument I read in a previous article, that a fuse-switch is a cost effective solution, this is in [...]

Discover our new electrical engineering forum !

Laurent — Wed, 19 May 2010 16:47:51 +0000

Just click on the “Forum” tab to get there! You will see 2 Forums: * General discussion, for all topics related to electrical engineering and energy efficiency * Blog and Forum issues, for suggestions, problems .. Laurent M, moderator

High voltage fuse: it’s good if properly used!

Laurent — Wed, 12 May 2010 07:49:57 +0000

A recent article from Lothar presented a bad experience with fuses. I would like to say that high voltage fuse remain a good solution, provided that they are used in a proper way. Fuse-switch protection for MV/LV transformer is the most common solution, mainly because it is a cheap solution, compared to circuit breakers. Of course high voltage [...]

Building Facility Manager : web community ?

Francois — Sat, 01 May 2010 11:41:25 +0000

An energy management web community for commercial building facility manager s : myth or reality? Social networks are booming whether they are personal, such as Facebook or Myspace, or professional such as Linked-in or Viadeo. This momentum demonstrates deep changes in our behaviour and shows the need for people to communicate and share their experience, through [...]

High voltage fuse: it’s rubbish!

Francois — Fri, 23 Apr 2010 10:45:43 +0000

Excuse my words, I am so upset … I give you my story. My name is Lothar Schmitz, I am 39 and my job is Service electrical maintenance Manager. Our main customers are large industrial sites. We had a shortcircuit in one of our substation of our network: one 10kV high voltage fuse melted. A guy [...]

8/8 – Electrical equipment: know more about Power Harmonics

Francois — Thu, 08 Apr 2010 07:40:55 +0000

Basics on Power Harmonics The following figure illustrates the typical waveforms of line current and line voltage for a three-phase variable speed drive. The line current is distorted as a result of the non linearity of the input rectifier. The voltage distortion is the result of the circulation of the distorted current through the line impedance. In this [...]

Remote energy management

Francois — Tue, 23 Mar 2010 08:00:21 +0000

Energy monitoring as a “hosted” service: this is my choice! Yesterday, very few commercial buildings had a building energy management system implemented, even less a system actually used regularly by the facility manager. Tomorrow this will become common place, if not mandatory, even for small size buildings. The drivers behind this trend are known: improve the bottom [...]

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 [...]