Author name: G K Agrawal (Retd. Sr. DGM BHEL)

G K Agrawal is a retired Sr. DGM from BHEL, with B.Sc. and B.Tech (HBTU Kanpur). He has extensive experience in electrical and electronics R&D and product development. He has created 400+ technical video tutorials on YouTube and shares practical industry knowledge to bridge the gap between theory and real-world engineering.

Low Power Factor Correction: Industry vs Home insight by Expert

/ Power factor, AC supply, Electrical, Power system / 20/03/2026
Power factor correction concept

In this post, I discuss: why “power factor correction” and its method, the causes and problems of low power factor, and how to correct power factor and its advantages. You will also learn fixed step type and continuous variable PF correction, the need for fast correction (SVC), and the need for an extra inductor.

There are many more advantages of power factor correction discussed in this article.

I will also discuss extra knowledge as per my industry experience of designing such control equipment. The power factor correction is done for many reasons.

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CT Secondary Open Circuit Use: 3 Secondaries Example Uncovered

/ Electrical transformer, Electrical / 20/03/2026
How to use open circuit transformer

In this post, I explain, how to use a CT transformer (current transformer) with an open circuit secondary under certain conditions with a few examples. I will also explain, why high voltage comes in an open circuit, voltage limiting factors, electrical and flux equivalent circuit of the open circuit CT.

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How the SMPS Transformer works: Waveforms theory

/ Electrical transformer, Electrical / 20/03/2026
smps transformer concept

I will explain about the SMPS switching transformer working concept. I will also discuss the core type, losses, Litz winding type, voltage and flux generation sequence, and reason for the small size and less weight of the SMPS transformer and differences from the power transformer.

I will also tell about using 1952 numbers of transformers used in one of our projects.

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