Deadly mistakes when working with switchgear

March 1st, 2018 | 1 Comment | Posted in Electrical Safety

medium voltage switchgear mistakes

Open secondary circuit of a current transformer

It is well known that an open secondary circuit of a loaded current transformer would cause a very rapid and large increase in voltage on the secondary side that could lead to arc formation and possible explosion.
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Fuse failure supervision (supervision functions)

February 19th, 2018 | 1 Comment | Posted in Electrical distribution

Ahmed H. wanted to tell us about Supervision functions- especially Fuse failure supervision. Enjoy!

fuse failure supervision

What is fuse failure supervision?

Fuse-failure supervision is a function used to supervise the operation of the fuses responsible for protecting the secondary circuit of the potential transformer, which delivers the reduced voltage to the protection relay and voltmeters.

In relay codes and substation automation, the fuse-failure supervision function can be identified by the following symbols,
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Domestic electrical wiring: protection schemes & standards

February 15th, 2018 | Make a comment | Posted in Electrical Safety
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K. is one of the newest members of the community and has been sending us articles for few weeks now. Today he chose to focus on domestic electrical wiring.

You can send us your writings too via email.

Introduction

Electrical power is transferred from generating stations to consumers at different voltage levels. Electrical power can be considered just like gas or water and same rule applies to its distribution i.e. proper pipeline and associated valves/switches.
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Current and auto transformers (working principle)

February 12th, 2018 | 1 Comment | Posted in Electrical distribution

As we know transformers are device for converting one AC voltage to the another AC voltage with same frequency. One transformer is made of core, primary windings and secondary windings.

In general there are two main classes voltage and power transformers. Let Milan – one of the members of the Electrical Engineering Community Blog tell us about it.

Principle of one classic transformer

Picture 1. Principle of one classic transformer

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Sympathetic tripping in electrical power systems

February 9th, 2018 | 2 Comments | Posted in Electrical distribution

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New article by Carlos who sometimes sends us his essays. If you too want to be published in the blog, do not hesitate to send us a mail.

Introduction

Several industries and utilities have experienced circuit breakers tripping due to undesirable relay operations, producing blackouts and a decrease in their expected incomes. This situation has raised a lot of concern in managers, grid operators, and reliability and protection engineers who have carried out root cause analysis to determine the origin of the missoperation of the protection systems.
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