Archive for the ‘Electrical distribution’ Category

Analysis of transients in layered type transformer windings

December 14th, 2018 | Make a comment | Posted in Electrical distribution

When a surge arises in case of lighting strike or a switching impulse, which could be the cause for insulation deterioration and at the end dielectric breakdown. This is a severe process, that depends on several factors, such as the frequency at which the transformer is exposed, the configuration of the system, the application of the component etc.

electrical power surge

Motors and distribution transformers are constantly exposed to fast surges, when they are switched by circuit breakers. Reigniting occurs during the switching of motors and transformers with vacuum circuit breakers, because of their ability to interrupt high-frequency currents.

This article presents the analysis of the measured and calculated voltages along the high-voltage winding of the transformer.

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Autotransformers: optimal location & installation

December 6th, 2018 | Make a comment | Posted in Electrical distribution

In this article you will read about the technical and economic analysis for the optimal location of installation of 2 autotransformers with voltage ratio of 400/110 kV, which are equipped with automatic load regulation.

This article is a feedback from an electrical project. It was written and sent to us by your fellow electrical engineer Mile from Macedonia :) Let’s begin!
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Transient process during electric arc furnace capacitor batteries switching

November 13th, 2018 | Make a comment | Posted in Electrical distribution

In this article, your fellow electrical engineer Mile is observing the transient process, during the switch of electric arc furnace capacitor batteries.

In most of the cases, the batteries have some inductive character, besides capacitive, and because of that fact they act as higher harmonics filter.

But in today’s article the case is different. Read Mile’s nice explanations below and don’t forget to comment afterwards…

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Wiring Connections of the Doble to measure insulation on transformers (AC model and impedance measurement)

October 15th, 2018 | Make a comment | Posted in Electrical distribution

megaphone1Hi everyone, it’s Steven Mill again :) After the Megger vs Doble article published on July 2d, here is another article.

Accurately measuring the insulation of an electrical equipment is essential to ensure the operation of the system and to comply with security standards as well.

Therefore, as discussed previously in the Megger vs Doble article, the Doble measurement instrument is the ideal to perform regularly maintenance insulation tests on any transformer, circuit breaker, switch and motors.

In this article, we will examine the basics to understand how to use this instrument.
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Electrical switchboards in 2050: AC or DC?

September 27th, 2018 | 3 Comments | Posted in Electrical distribution
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ac or dc driveNew article / essay by Muhammad, one of our dear senior electrical engineers. With more than 30 years of experience, he sometimes spoils us with great and original articles just like this one.

If you’ve ever wondered what your grandchildren will use between AC and DC, well enjoy your reading! Don’t forget to give your opinion in the comments section.
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