Single and Bidirectional Phase Controlled Thyristors

November 21st, 2014 | Make a comment | Posted in Electrical distribution
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After a focus on the different types of thyristors, one of our member decided to share information about single and bi-directional thyristors. Hope you’ll enjoy his sharing.

Introduction

One directional thyristor, also known as Silicon Controller Rectifier (SCR), is actually nothing more than a simple four layered current controlling device that allows passing current only in one direction. It has three junctions and three terminals. The device operates if current passes through the gate of the thyristor that is connected to the p-type material nearest to cathode.

Single and Bi-Directional Thyristors 1
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What is smart meter on low voltage? (back to basics)

November 18th, 2014 | Make a comment | Posted in Energy Efficiency - building
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Hi, last time I told you about smart meter on middle voltage ; this time let’s see the basics of smart meter on low voltage.

Low is considered a voltage up to 1kV. There are two ways for measuring on low voltage:

  • Direct measuring – this method is used for current up to 100A (there are one phase and three phase electricity smart meters for this type of measurement)
  • Indirect measuring – this method is used for current over 100A (you need current transformers for low voltage)

Direct measuring

In the following pictures you can see how the different electricity smart meters look like depending on the measurement method.

One phase electricity smart meter for direct measuring

One phase electricity smart meter for direct measuring

These smart meters are to be mounted on small electricity consumers like small houses, apartments, small shops.

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Top 10 factors that govern selection of medium voltage drives

November 14th, 2014 | Make a comment | Posted in Electrical distribution
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Few weeks ago, we recieved this very interesting article from a senior engineer. Just for us, he made a list of 10 factors that should drive you to select medium voltage drives.

So here’s an expert’s advice…

Though medium voltage drives have been around for more than three decades now, high quality and reliable medium voltage drives have only been available since the past few years.

Specifying and choosing high quality medium voltage drives can often be a tedious task, because there are many parameters that govern its quality and performance.

High Quality Medium Voltage Drives

High Quality Medium Voltage Drives

Many companies claim that the drives manufactured by them are of high quality, even if they are not. Because, they believe that, not many people will go into the details. And that’s true! Only an experienced electrical engineer would know the difference between a high quality and ordinary voltage drive.

Depending on my 15 years of experience, as a project manager for a reputed steel company, I would recommend you to carefully examine the below top 10 factors that can actually help you to differentiate high quality and ordinary medium voltage drives:

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Types of Thyristors

November 10th, 2014 | 1 Comment | Posted in Electrical distribution
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Nasir shares a brief overview of the different types of thyristors available and how are they categorized…Enjoy!

One of the most interesting things about thyristors is that they are manufactured in a unique way by the process of diffusion. We have already studied the working characteristics of a thyristor and how the gate signal acts in switching the device on and off. When the device is switched on, it takes a bit of time for the anode current to propagate through the junction, since we know that a thyristor is composed up of three junctions.

So for initiating this activity, we use the gate signal, so the gate is essentially one of the most sensitive and important part of the thyristor. Due to this fact the manufacturers pay special attention to the gate structures while manufacturing a thyristor.

Types of Thyristors
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Thyristor Characteristics

November 7th, 2014 | Make a comment | Posted in Electrical distribution
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As you may know, Nasir is one of our members who loves to write tutorials, and since last month he’s been sharing a serie of tutorial about semi conductors. Here’s the 5th article of the series.

You can be published on the blog too, just send us a mail.

Thyristor is another electronic component which belongs also belongs to the family of power semiconductor switching devices. It is a bi-stable switch, which means that both its open and closed states are stable and can be controlled successfully whenever desired. This is one of the features which make thyristors more preferable and extensively used in various applications.

Structure of a Thyristor

A thyristor is a four layered PNPN structured semiconductor device consisting of three PN junctions. The basic structure of a thyristor can be displayed as follows:

Thyristor Characteristics

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