Energy and Power
An Overview Of Short Circuit Current (part 2)
Continued from previous technical article: An Overview Of Short Circuit Current (part 1) Sub transient reactance Xd” is the apparent reactance of the stator winding at the instant short circuit… Read more
Feb 27, 2013 | By Asif Eqbal
Energy and Power
An Overview Of Short Circuit Current (part 1)
There are essentially four types of faults: three-phase, single line-to-ground, double line-to-ground, and line-to-line. Each of these types of faults can result in different magnitudes of fault current. In all… Read more
Feb 25, 2013 | By Asif Eqbal
Energy and Power
And Now Something We All Use – The Socket Outlets
A socket outlet is a female socket connected to the power wiring in the building and will accept the male plug attached at the end of the flexible cord of… Read more
Feb 22, 2013 | By Edvard Csanyi
Energy and Power
Medium Voltage Switchgear (2) – Selection of Switching Devices
Continued from first part: Medium Voltage Switchgear (1) – Basics of Switching Devices Switching devices are selected both according to their ratings and according to the switching duties to be… Read more
Feb 13, 2013 | By Emmanouil Angeladas
Energy and Power
The Basics of Switching Devices In Medium Voltage Switchgear (Part 1)
According to international rules, there are only two voltage levels: Low voltage: up to and including 1kV AC (or 1,500V DC) and High voltage: above 1kV AC (or 1,500V DC). Most electrical… Read more
Feb 11, 2013 | By Emmanouil Angeladas
Energy and Power
Did Tesla Discover the Secrets of Antigravity?
Nikola Tesla has been credited for the creation of much of the technology that we take for granted today. Without the genius of Tesla we would not have: Radio, Television,… Read more
Feb 06, 2013 | By Edvard Csanyi
Energy and Power
How to manipulate energized conductors with hot stick
Hot sticks are poles made of an insulating material. They have tools and/or fittings on the ends which allow workers to manipulate energized conductors and equipment from a safe distance…. Read more
Jan 28, 2013 | By Edvard Csanyi
Energy and Power
Comparison of Protection Relay Types
This comparison summarize characteristics of all protection relay types described in previously published technical articles: Using Protective Relay For Fighting Against Faults The Good Old Electromechanical Protective Relay The Solid… Read more
Jan 23, 2013 | By jiguparmar
Energy and Power
Power measurement in a three-phase system
Electrical power is measured with a wattmeter. A wattmeter consists of a current coil connected in series with load, while the other potential coil is connected parallel with load. Depending… Read more
Jan 19, 2013 | By Edvard Csanyi
Energy and Power
Discrimination between residual current circuit breakers (RCCBs)
The operating principle of the residual current release is basically the detection of an earth fault current, by means of a toroid transformer which embraces all the live conductors, included… Read more
Jan 11, 2013 | By Edvard Csanyi
Energy and Power
Lighting Circuits Connections for Interior Electrical Installations (3)
Continued from 2nd part: Lighting Circuits Connections for Interior Electrical Installations (2) The main reason for installing an emergency lighting system is to enable the building to meet fire safety… Read more
Jan 02, 2013 | By Emmanouil Angeladas
Energy and Power
Flexibility and Reliability of Numerical Protection Relay
The first protection devices based on microprocessors were employed in 1985. The widespread acceptance of numerical technology by the customer and the experiences of the user helped in developing the… Read more
Dec 27, 2012 | By jiguparmar
Energy and Power
Few Words About Digital Protection Relay
Around 1980s the digital relay entered the market. Compared to the Solid State Relay, the digital relay takes the advantages of the development of microprocessors and microcontrollers. Instead of using… Read more
Dec 24, 2012 | By jiguparmar
Energy and Power
Inspection and Test Procedures for Metal-Enclosed Busways
Visual and Mechanical Inspection Electrical Tests Test Values Test Values – Visual and Mechanical Test Values – Electrical Tables: TABLE 100.12 – US Standard Fasteners Bolt-Torque Values for Electrical Connections… Read more
Dec 22, 2012 | By Edvard Csanyi
Energy and Power
Short-Circuit Switching Capacity Definition
The switching capacity is the r.m.s value of a current at a given power factor cosφ as well as a given rated voltage at which a switchgear or a fuse… Read more
Dec 20, 2012 | By Edvard Csanyi
