Energy and Power
Overvoltages Caused by Indirect Lightning Strokes
A direct stroke is defined as a lightning stroke when it hits a shield wire, a tower, or a phase conductor. An insulator string is stressed by very high voltages caused by a direct stroke. An insulator string can also… Read more
May 08, 2012 | By Edvard Csanyi
Energy and Power
Using AC and DC together in electrical system?
There are a number of issues to using AC and DC together in the same electrical system. Briefly, they are: circuit boxes and hardware, outlets, wiring schemes and sizes, and switches. The Electrical Code prohibits AC and DC in the same box. You’ll need two… Read more
May 05, 2012 | By Edvard Csanyi
Energy and Power
Types of Residual Current Devices (RCD)
For domestic applications only the first five of the below listed residual current devices (RCD) need to be considered. For industrial and commercial buildings all of the classifications need to be considered. Table below aims to identify where each type… Read more
May 03, 2012 | By Edvard Csanyi
Energy and Power
Time relays setting ranges explained in details
Time relays are used in control switching operations involving time delay. Most of these time relays have multiple time setting ranges and most of them are explained below. Time relays perform either on-delay or off-delay timing. An arrow is used… Read more
Apr 30, 2012 | By Edvard Csanyi
Energy and Power
Overview Of Electrical Loads In Building
The electrical design professional should determine a building’s electrical load characteristics early in the preliminary design stage of the building to select the proper power distribution system and equipment having adequate power capacity with proper voltage levels, and sufficient space… Read more
Apr 27, 2012 | By Edvard Csanyi
Energy and Power
System protection and safety coordination definitions
The objective of system protection is to detect faults and to selectively isolate faulted parts of the system. It must also permit short clearance times to limit the fault power and the effect of arcing faults. High power density, high… Read more
Apr 16, 2012 | By Edvard Csanyi
Electrical Lectures
Inspection Of Voltage Drop In Conductors
It is part of the inspection process to ensure that installed conductors have been correctly selected for current carrying capacity and voltage drop. To check the suitability of the current carrying capacity it is simply a matter of looking at… Read more
Apr 15, 2012 | By Edvard Csanyi
Electrical Lectures
What is incident energy caused by arc flash?
Incident energy is the energy per unit area received on a surface located a working distance away from the arc flash location. The working distance is the distance from where the worker to the flash location. This is basically an… Read more
Apr 13, 2012 | By Edvard Csanyi
Energy and Power
Key Cyber Security Purposes for the Smart Grid
In the Smart Grid, there are two key purposes for cyber security: Keep electricity flowing to customers, businesses, and industry. For decades, the power system industry has been developing extensive and sophisticated systems and equipment to avoid or shorten power… Read more
Apr 12, 2012 | By Edvard Csanyi
Electric Motor
Star-delta motor starter explained in details
Where is Star-Delta motor starter used? Well, the majority of induction motors are started directly on line (DOL), but when very big motors are started in this manner, the large starting current surges produce a disruption in the voltage on… Read more
Apr 10, 2012 | By Jignesh Parmar
Electrical Lectures
Short review of resistance, reactance and impedance
Resistance is essentially friction against the motion of electrons. It is present in all conductors to some extent (except superconductors!), most notably in resistors. When alternating current goes through a resistance, a voltage drop is produced that is in-phase with… Read more
Apr 08, 2012 | By Edvard Csanyi
Energy and Power
Single-Phase Power vs Three-Phase Power
The principal elements of an electric power system are the generating stations, the transmission lines, the substations, and the distribution networks. The generators produce the electricity, the transmission lines move it to regions where it is consumed, and the substations… Read more
Apr 01, 2012 | By Edvard Csanyi
Electrical Lectures
Capacitor Banks In Power System (part four)
Let us consider that there is a captive diesel generator (DG) the rating of which is specified as 1000kVA and PF 0.85. Rating in kVA specifies the maximum current the alternator can deliver at the system voltage. In the previous… Read more
Mar 27, 2012 | By Asif Eqbal
Energy and Power
Inspection of electrical installations in home (2)
Every installation deteriorates with use and age. Therefore, one must ensure that the safety of users is not put at risk and that the installation remains in a safe and serviceable condition. Continued from part I – Inspection of electrical… Read more
Mar 26, 2012 | By Edvard Csanyi
Energy and Power
Inspection of electrical installations in home (1)
Europe has an ageing housing stock. There are many homes with outdated wiring. This wiring is deteriorating, has been inappropriately amended, or is insufficient for the electrical loads of today’s typical household. Many of the homes have not undergone any… Read more
Mar 24, 2012 | By Edvard Csanyi
