Posts Tagged ‘reactive power’

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!


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.

Power factor correction of networks (work experience)

July 4th, 2016 | Make a comment | Posted in Power quality
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electrical-engineer-testimonyIn last month newsletter (newsletter#79), we introduced you to Mile, one of the members of the community.

From then on, he kindly decided to help providing the blog with material, and his 1st attempt is about power factor correction of networks.

Tell this young man from Macedonia what you think about it below!

Synchronous motor: field regulation techniques

April 26th, 2016 | Make a comment | Posted in Energy Efficiency - motors
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Last time, D. Ros published a very interesting article about motors and drives. Today he’s at it again with synchronous motors and guess what? He proposed to publish a series of articles about motors! We thank him dearly.

If you want to contribute to the blog too, simply send us a mail

Synchronous machines are highly regarded in the industry for their unique applications of high mechanical power demand, power system control, and plant power factor correction.

However, the uniqueness of these applications has lead into different regulation techniques oriented to meet their specific requirements.

Ball Mill driven by Synchronous Motor

Figure 1: Ball Mill driven by Synchronous Motor


Tariff and metering for low voltage systems

December 29th, 2014 | Make a comment | Posted in Electrical distribution
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Let Marvin tell you about reducing power losses and remember that you too can send us your articles by mail.

Different countries, regions, and power utility companies use different variables for billing and tariff structures. The primary objective of this article, thus, is not to focus on particular tariffs, rather, the basic elements that permeate across all the regions.

In short, I seek to highlight the two fundamental ways to reduce peak power demand and power losses in the generation and transmission.

Power Peak Demand Reduction

To get the most out of the generation and transmission company, the primary objective is to reduce power peak demand while seeking higher demand during the low load periods. Most power utility companies offer reduced tariffs at specified times of the day and year. Do note that the higher the peak demand, the higher the bill amount.

For large industries operating on LV and MV, there may be as many as four different rates used for calculation in the course of the day. The primary objective of the attending engineer is to get the maximum load, or shift the loads to maximize on the lowest rates.

Tariff and metering for low voltage systems

Are Power Factor Correction Units Necessary For Residential Consumers? (Debate)

December 8th, 2014 | 4 Comments | Posted in Power quality
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Few weeks ago, we received this debate from Martin M., one of the visitor of the blog. So here is his interesting opinion on Power Factor Correction…

You too can send us a mail if you want to create a debate on the topic of your choice.

Are Power Factor Correction Units Necessary For Residential Consumers

You may have come across a nice, clear video on the importance of purchasing Power Factor Correction (PFC), also known as KVAR units for residential consumers. You may be luckier and actually met a salesperson, all verbose on how you can save a lot of money by installing a simple device between the power supply and the home appliances.

The selling point implicitly relies on people’s ignorance, as well as well laid-out misinformation and skewed facts. The main selling points for the scammers include the following

  • Home appliances such as refrigerators and washing machines are induction equipment and thus draw reactive power from the system.
  • Many industries use the PFC units to save energy, and so should you.
  • There are a number of positive ‘testimonials’ from satisfied clients.


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