Archive for the ‘Power quality’ Category

Requirements for a good grounding system (400 kV power line)

July 6th, 2017 | Make a comment | Posted in Power quality
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megaphone-yellowMile is one of the community members. He’s a young electrical engineer from Macedonia who likes to share is experience.

Let’s read his essay on grounding systems, based on what he’s experienced in his recent career.

And if you want to share your experience as a young electrical engineer, do not hesitate to contact us.

It is very well known, that in case of short circuit in the power system, the current that appears on the place of the short circuit, is directly transferred to the earth.

The value of the current, which flows through the power lines and in the grounding system itself, and the short circuit time, depend of the type of the grounding of the neutral point of the network and the characteristics of the relay protection system.
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3 Different ways to improve Power Factor

May 2nd, 2017 | Make a comment | Posted in Power quality
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H. is a fresh graduate from Dubai. Read her review about how to improve Power Factor. She gives you 3 ways to do it and it’s a nice back to basics type of article. Enjoy!
improve Power Factor

Power factor is a very common term in electrical applications because it determines the efficiency of an electrical system. It is a word that you will only hear when dealing with AC circuits as shown by its simple formula:

power factor formula
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Flexible Alternating Current Transmission System (FACTS)

January 19th, 2017 | Make a comment | Posted in Power quality

megaphone-yellowThe Flexible AC Transmission System (FACTS) is a technology that is designed to quickly supply the transmission network with capacitive or inductive reactive power so as to improve the quality and efficiency of power transmission systems.

Let your fellow electrical engineer A.N tell you about that! If you want to publish articles just like him, please send a mail to the team.
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Electrical Installations: Old VS New

October 24th, 2016 | Make a comment | Posted in Power quality
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Last time, your fellow electrical engineer Pablo told you about his bad experiences concerning grounding. Now he wants to deal with the electrical installations topic and he got 3 questions for you at the end of the article!

There are many differences that I can mention I found among old residential electrical installations (50 years ago) and today’s installation. The energy needs have changed. The main point is the demand, although it is true that today families have greater economic capacity to acquire more electrical equipment is so quite true that the equipment efficiency has improved considerably.

In the following figures can be seen as the average energy consumption has decreased slightly in recent years:

average-household-lighting-electricity-use average-household-gas-electricity-use
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Reactive power compensation in long middle voltage power lines

July 22nd, 2016 | 2 Comments | Posted in Power quality
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megaphone-darkblueMile is a young member of the community and he often sends articles about several topics. But his particularity is that he shares the experiment he had in school as a young electrical engineer student in Romania.

You too can share your experiment and be published in the blog, just send a mail to the team!

Introduction

The general purpose of this article is to compare several ways of compensation of reactive power in middle voltage power lines in order to determine the optimal technical and economical solution. In this article I am going to examine middle voltage power line which is fed from 110/20 kV/kV transformer station. Load flow analyses will be made for different cases and loads for the transformer station. According the results from the analyses the optimal technical solution will be determined.
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