Generating Electricity with Combustion Turbines
There are two basic types of combustion turbines (CTs) other than the microturbines: The heavy frame industrial turbines and The aeroderivative turbines. The heavy frame systems are derived from similar… Read more
May 28, 2014 | Edvard
Arriving at the scene of a pole fire. What to do?
Utility pole fires are common and should be treated with great respect by firefighters. Pole fires are normally caused by the failure of insulators, switches, catastrophic failure of transformers or… Read more
May 21, 2014 | Edvard
Case study – Improper grounding practice of computers in buildings
In a large office complex, computer errors including system crashes/reboots were happening during thunderstorms. The grounding of computer system had been carried out according to the recommendations of manufacturers. The grounding leads… Read more
May 14, 2014 | Edvard
Earthing (grounding) transformer – Voltages during a ground fault
Earthing Transformer or grounding transformer is the neutral grounding transformer – star connected on the primary and has an open delta on secondary. Open Delta has two terminals. A resistor is… Read more
May 05, 2014 | Asif Eqbal
What affects the operating temperature within LV switchgear
BS EN 60439 states a maximum indoor ambient temperature of 40ºC, a maximum daily average of 35ºC and a minimum ambient of -5ºC. As a general guidance rule, the temperature… Read more
Apr 30, 2014 | Edvard
8 steps to begin basic circuit design
What do we need to know? Clearly, plunging into calculations of cable size is of little value unless the type of cable and its method of installation is known. This,… Read more
Apr 11, 2014 | Edvard
Which type of residual current device (RCD) to use and when?
We know how (very) important the total earth loop impedance Zs is in the reduction of shock risk. However, in TT systems where the mass of earth is part of… Read more
Apr 09, 2014 | Edvard
Electromagnetic stresses on a busbar system and methods of reducing
When a conductor carries a current it creates a magnetic field which interacts with any other magnetic field present to produce a force. When the currents flowing in two adjacent… Read more
Apr 02, 2014 | Edvard
Electrical Design Project of a Three Bed Room House (Part 2)
Continued from 1st part: Electrical Design Project of a Three Bed Room House (Part 1) All new domestic dwellings, including conversions, must either have: A fire detection and fire alarm… Read more
Mar 31, 2014 | Sufi Shah Hamid Jalali
Enclosure protection against ingress of solid objects and liquids
As you already probably know, IP stands for Ingress Protection. International Electrotechnical Commission – IEC 60529 “Degrees of protection provided by enclosures (IP Code).”. NEMA offers a similar rating system…. Read more
Mar 26, 2014 | Edvard
Underfloor cable systems explained in details
It should be understood that the generic term ‘underfloor’ applies to products designed for such use but which may well be used in other environments where the protection is appropriate…. Read more
Mar 24, 2014 | Edvard
Electrical Design Project of a Three Bed Room House (1)
Electrical design is not an easy task. It requires a lot of expertise. Detailed study is needed prior to installation work. The engineer must consider quality and any specific requirements… Read more
Mar 21, 2014 | Sufi Shah Hamid Jalali
Electrical Thumb Rules You MUST Follow (8)
Accuracy Class of Metering CT Accuracy Class Letter of CT Accuracy Class of Protection CT Continued from part 7: Electrical Thumb Rules You MUST Follow (Part 7) Metering Class CT… Read more
Mar 10, 2014 | jiguparmar
The Risk Of Deadly Lightning Current and Few Things You Should Know
Lightning currents are load-independent currents, i.e. a lightning discharge can be considered an almost ideal current source. If a load-independent active electric current flows through conductive components, the amplitude of the current,… Read more
Mar 05, 2014 | Edvard
Total Losses in Power Distribution and Transmission Lines (2)
Continued from first part: Total Losses in Power Distribution & Transmission Lines (1) There are two types of transmission and distribution losses: Technical losses (explained in previous part) Non-technical losses… Read more
Mar 03, 2014 | jiguparmar
