Manufacturers of electric motors and frequency converters have evolved various methods for quickly selecting the size of motors and frequency converters for a particular machine load. The same basic procedure… Read more
Dec 12, 2016 | Electric Motor
Although nowadays differential protection is achieved numerically, in order to understand the principles of differential protection it is useful to analyze the ubiquitous electromechanical relay. Figure 1 shows a simple… Read more
Dec 09, 2016 | Power Substation
The cabling of the industrial communication systems (Modbus RS485) is different in some ways from the cabling used for power cabling and the electrician may experience some difficulties if he is not… Read more
Dec 07, 2016 | Industrial Automation
The busbars constitute the real “backbone” of every low voltage switchgear. The main busbar and branch busbars supply and distribute the energy. The same applies to connections between bars, whose quality… Read more
Dec 05, 2016 | Energy and Power
The metal-enclosed gas insulated switchgear inherently follows the criteria for new substation design and offers a higher reliability and flexibility than other solutions. Due to the gas enclosed design, GIS… Read more
Dec 02, 2016 | Energy and Power
We have all heard the term Inductor many times, but what is it? Well, it is a passive element designed to store energy in its magnetic field. Inductors find numerous… Read more
Nov 30, 2016 | Electrical Lectures
Dead circuit testing is testing performed with the power disconnected from the circuit. The main benefit of disconnecting power supply while tests with an external energy source are performed is… Read more
Nov 28, 2016 | Energy and Power
When you find that your earth electrode resistance is not low enough, there are several ways you can improve it: Lengthen the earth electrode in the earth Use multiple rods… Read more
Nov 25, 2016 | Energy and Power
A number of transformer fault conditions can arise practically in any time following some special situations. These include the following 5 most common internal faults and few external: Earth faults… Read more
Nov 23, 2016 | Energy and Power
The use of protective conductors linking all the exposed conductive parts of all equipment creates a circuit called the “fault loop” designed for circulation of the fault current that arises… Read more
Nov 21, 2016 | Energy and Power
