Photovoltaic systems using micro inverter ?

February 4th, 2010 | Make a comment | Posted in Energy Efficiency - solar
Tags: , , ,

I will explain here the solutions and its principle for avoiding production losses  when 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 module to track individual Maximum Power Point. I will detail 2 design approaches with their benfits & drawbacks. 

shading

Read the rest of this entry »

GPS synchronization for power system s

January 27th, 2010 | 3 Comments | Posted in Power quality
Tags: , , , , ,

GPS time Synchronization:  starts with precision timing.

 
Precision timing is required for monitoring and control of electrical power networks where 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 power” applications include electric utility networks, data centres, hospitals, water treatment plants, refineries, and other process industries.

Read the rest of this entry »

Earthing system design

January 22nd, 2010 | 5 Comments | Posted in iec standard
Tags: , , ,

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 my question is whether this is an acceptable practice followed by industry or the earth electrodes of the two systems (protective earthing and lightning protection) can not be combined this way?
Would appreciate feedback. thanks in advance. 
D. Sunil 

Read the rest of this entry »

6/8 – Electrical equipment: improve power factor

January 20th, 2010 | 4 Comments | Posted in Power quality
Tags: , , ,

How to improve ?

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” component of the current.
Ir is called the “reactive” component of the current.

Voltage and current vectors

Voltage and current vectors

Read the rest of this entry »

January 2010: call for donors

January 12th, 2010 | 1 Comment | Posted in your need? your contribution?
Tags:

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!

looking for Donors

looking for Donors

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 and assist with support. In exchange, for those who so wish, we are proposing to allow each donor to place his logo (and Web link) on the blog. You yourself decide how much you wish to donate…

 

2. The aim is more than ever the technical quality of the articles and exchanges in the field of electrical equipment, electrical installation and energy management: today’s experiences and tomorrow’s solutions…

3. A team is being set up to moderate this blog: it will consist of Martine, François, Stéphane, Jean-Paul and Laurent.

Have an excellent year!
The Electrical Engineering blog moderator team

Electrical Energy Efficiency

January 8th, 2010 | 3 Comments | Posted in Energy Efficiency - building
Tags: , , , , , , , ,

Introduction of Electrical in Low-Voltage

Draft for a new IEC standard
At an hour when advices for are to be written, the challenge is to aim at completed general installations rules for of buildings, in the way to obtain the highest possible service for the lowest energy consumption. This shall be true in new and also in existing buildings.

Read the rest of this entry »

UPS protection

December 30th, 2009 | 10 Comments | Posted in Electrical distribution
Tags: ,

Looking for a rule of thumb to design UPS protection network?

Uninterruptible power supplies is essential nowadays in both commercial and industrial buildings. However, short circuit protection is not that simple matter, at least I think, when using UPS.

Read the rest of this entry »

The Pareto law

December 21st, 2009 | Make a comment | Posted in Engineering Web tips
Tags: ,

A good reminder thanks to Mr Vilfredo Pareto (Italian)
Business management, Engineering management,  Personal productivity

“To maximize your personal productivity, realize that of the many things you do during your day, only 20 percent really matter!  Identify and focus on those things. What do you do with those that are left over? Either delegate them or discontinue doing them.
Work Smart – identify your 20% now!”

Pareto Principle

Pareto Principle

Read the rest of this entry »

5/8 – Electrical equipment: power harmonics, power factor

December 12th, 2009 | 1 Comment | Posted in Power quality
Tags: , , ,

The benefits of Power Factor Correction and Power Harmonic mitigation

6 Benefits are described here:

  • Reduce electricity bill
  • Reduce power losses
  • Reduce cable size
  • Comply with power harmonic emission limits requested by Utilities
  • Improve process quality
  • Improve business performance
    Read the rest of this entry »

Photovoltaic systems contracting

December 7th, 2009 | 4 Comments | Posted in Energy Efficiency - solar
Tags: , ,

This is an interesting experience of installing photovoltaic systems in France

photovoltaic systems - in Provence - South east of France -

- in Provence - South east of France -

Read the rest of this entry »

Electrical engineering BLOG is proudly powered by WordPress
Entries (RSS) and Comments (RSS) and license Creative Commons License

webleads-tracker

Accueil::Accueil