Benefits and applications of medium voltage

August 28th, 2014 | 1 Comment | Posted in Electrical distribution
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Benefits and applications of medium voltage according to Marvin M, one of the member of the community.

Introduction

Traditionally, any voltage over 600 V would evoke thoughts of high danger from the perceived high voltage. Engineers and technicians alike would abandon any systems operating over that limit and instead focus on the low voltage components, citing relative low risk levels.

Today, however, high skill levels, standards and installation requirements ensure that working with medium voltage is safe. It accords the following benefits.

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Low Voltage AC drives – their characteristics & their applications

August 25th, 2014 | Make a comment | Posted in Electrical distribution
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Hello, it’s Steven Mill! What do you know about LV AC drives? Let me tell a few words about it…

What are AC Drives?

There are adjustable speed drives that control the speed of DC and AC motors. The speed of an AC motor is determined mostly by two factors i.e. the frequency applied and the number of poles. So the formula goes as:

Low Voltage AC drives 1

Where:

  • N = RPM
  • F = frequency
  • P = no. of poles

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Step Up and Step Down Transformers

August 21st, 2014 | Make a comment | Posted in Electrical distribution
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One of our fellow member of the EEC sent us this article few days ago. Remember you can do the same and talk about whatever you want, even yourself!

What is a transformer?

Transformers are devices that change (transform) the voltage of power supplied to meet the individuals needs of power consumers. It uses the principle of electromagnetic induction to change the voltage (alternating difference) from one value to another whether smaller or greater.

A transformer is made of a soft iron coil with two other coils wound around it, but not connected with one another. The iron coils can either be arranged on top of another or be wound on separate limps of the iron core.

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Ground and test devices for engineers and technicians

August 18th, 2014 | Make a comment | Posted in Electrical distribution
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Marvin M. from the community had the great idea to give advices regarding grounding and test devices. Enjoy and don’t forget to post your own advices if you have few.

Introduction

A ground and test device primarily applies personal protective grounds to the MV components and conductors in the assemblies. It is a primary necessity as it creates a safe working condition for the engineers and technicians.

In essence, it offers prime protection for the personnel, equipment and facilities. According to the set standards, achieving a prime electrically safe environment encompasses the following:

  • Identify all energy sources in the working environment
  • Isolate the sources
  • Verify electrical source isolation
  • Lockout the devices to the sources
  • Test for voltage absence using the appropriate test device
  • Apply temporary personal protective grounds

The above steps must be fulfilled before the actual grounding. Do note that negligence of any of the steps leads to disruption of the production process and injury to personnel. Luckily, for engineers and technicians, various standards have been set up governing ground and test devices.

Ground and test devices for engineers and technicians

Fig.1 Ground and test device working principle

The standard divides the test devices into two categories:

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Miniaturization of electrical machines

August 14th, 2014 | Make a comment | Posted in Others
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Hi everybody, today I want to tell you about the miniaturization of electrical machines, a growing phenomenon. Hope you’ll like it.

Introduction

Being a 21st century homo sapiens, we may deny the significance of oxygen while suffocating but we can never deny the utility of science in life. The word has penetrated deep into our blood. No matter what we are suffering the resolution is “Science”.

Whatever is the issue, if you can’t make proper round chapatti ask science to do it for you through bread maker, or if you don’t want your hands to be abrasive while evacuating the oil spots from used dishes turn to science and get yourself relished with the dishwasher. Science can’t be restricted to mere kitchen but to every part of our daily life.

You are concerned about your growing tummy but still you feel lethargic enough to visit any park, get yourself acquainted with a scientific creature named “treadmill” or when one morning you’re given 7 minutes to reach your office against your suspension, seek help from Lamborghini Aventador whose 690 Nm (507 lbft) @ 5,500 RPM Displacement can only be your savior there.

Miniaturization of electrical machines 1
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