Posts Tagged ‘electrical system’

Electrical Earthing / Grounding

May 22nd, 2013 | 2 Comments | Posted in Electrical distribution
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Hi everyone, a member of the community named Manish sent us an article about Electrical Earthing/Grounding. Remember you can send us articles by sending a mail to the team.

Introduction

Electrical earthing / grounding is one of the most important aspects of any electrical installation. Earthing or Grounding is a technique which is as old as the use of electrical power on a commercial scale. The practice came in to existence in the early days of electricity when the systems in use were all ungrounded and that led to frequent hazardous incidents caused due to electric shocks.

The term Earthing or Grounding simply means connecting the electrical system / equipment to the ground by means of a suitable conductor. Such a ground connection provides a common return path for safe discharge of electricity to the ground.

A properly grounded electrical system serves mainly two purposes:

a) It prevents from the risk of electrical shocks to any human being coming in contact with the system.

b) It protects the connected equipment from any possible damage occurring due to leakage currents or lightening or voltage surges, by providing a safe passage to these currents to ground.

Earthing of an electrical system is achieved by inserting an electrode (plate type / rod type) in to the solid mass of earth and then connecting this electrode to the earth wire coming from the electrical equipment.

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Faults in Electrical Systems (back to basics)

May 3rd, 2013 | 3 Comments | Posted in Electrical distribution
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Introduction

We all are familiar and encountered at least once the phenomenon of fault occurrence in electrical system. A power system failure across the town that happened due to a storm breakout or an internal equipment fault that disrupted your local power supply – these are all essentially the cases of faults in electrical systems.

Through this article let us try to examine this phenomenon in little more detail.

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Understand electrical circuit – comparison with water system

March 10th, 2011 | Make a comment | Posted in Electrical distribution
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To understand the electrical circuit physically the circuit can be thought as a closed water system. It is just for the novice learners so that they can understand the electrical network physically without complex imagination. It is not like that electrical system is not analogous to other mechanical system. But for the learners who are first learning this they may find it difficult to compare it with mechanical system. Besides this, a water system is easy to understand physically. If a student wants to think further about the electrical characteristics he can easily do it.

Now what is this comparison? Let’s take the example of water connection of your washroom. Here the water initially stored in the overhead tank. Then through the pipe connection it reaches to the every taps in the washroom. When the taps are not opened still they contain the water inside the pipe. And they are ready to flow the water when the tap will open.

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Harmonics current mitigation of electrical system

May 4th, 2009 | 12 Comments | Posted in Power quality
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When professionals want to manage an electrical system in a new installation or after retrofit or extension of an existing installation, it is important to consider the Harmonic currents emitted by the non linear loads connected to the distribution system.
The non linear loads or products producing harmonics can be as example, for industrial equipments: welding machines, battery chargers, variable speed drives for electrical motors, uninterruptible power supplies, or for office equipments or household appliances: TV sets, fluorescent lighting, light dimmers, etc…
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Harmonic filter for better power quality

April 16th, 2009 | 69 Comments | Posted in Power quality
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Power Quality Optimization with Active Harmonic Filter :

principle drawingIt is widely believed that active harmonics filters (AHF) are very costly and, therefore, are the last choice for power quality solutions.  The answer is it depends.  Every harmonics mitigation and power factor correction device has its place in the market.

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