Demand Factor-Diversity Factor-Utilization Factor-Load Factor
Originally published at Electrical Notes – Articles Demand Factor = Maximum demand of a system / Total connected load on the system Demand factor is always less than one. Example:… Read more
Nov 14, 2011 | By jiguparmar
Moving Iron Instruments – Voltmeter and Ammeter
Moving-iron instruments are generally used to measure alternating voltages and currents. In moving-iron instruments the movable system consists of one or more pieces of specially-shaped soft iron, which are so… Read more
Nov 13, 2011 | By Bipul Raman
High-voltage transmission lines and Electromagnetic Interference (EMI)
The corona discharge produces radio noise and in lesser extent television ( TV ) disturbances around high-voltage transmission lines. This can be easily observed by all of us when we… Read more
Nov 12, 2011 | By Edvard Csanyi
Installation of Distribution-to-Utilization Voltage Transformers
Aerial transformer installations may utilize a three-phase unit or banked single-phase units. Transformers, either singly or in banks, having an individual unit or combined capacity greater than 300 kVA will… Read more
Nov 11, 2011 | By Edvard Csanyi
Medium voltage circuit breaker operating sequence
Rated switching sequence according to IEC, O – t – CO – t’ – CO. (cf. opposite diagram): O – Represents opening operation CO – Represents closing operation followed immediately… Read more
Nov 10, 2011 | By Edvard Csanyi
Sources of Sound in Transformers
Unlike cooling-fan or pump noise, the sound radiated from a transformer is tonal in nature, consisting of even harmonics of the power frequency. It is generally recognized that the predominant… Read more
Nov 09, 2011 | By Edvard Csanyi
Working Principle of Earth Leakage Circuit Breaker (ELCB) and Residual Current Device (RCD)
Earth Leakage Circuit Breaker (ELCB) is a device used to directly detect currents leaking to earth from an installation and cut the power and mainly used in TT earthing systems…. Read more
Nov 07, 2011 | By jiguparmar
DC motor and generator – design, application and operation
History will recognize the vital role played by DC motors in the development of industrial power transmission systems, the dc machine being the first practical device to convert electrical power… Read more
Nov 06, 2011 | By Edvard Csanyi
Biodiesel – Myths and Facts
Few facts you most probably know already, but never the less to mention: A clean burning alternative fuel, produced from domestic, renewable resources such as plant oils, animal fats, used… Read more
Nov 05, 2011 | By Bipul Raman
Basic parameters used in lighting you should know
Abbreviation: φ phi Unit: lm lumen The luminous flux describes the quantity of light emitted by a light source. The luminous efficiency is the ratio of the luminous flux to… Read more
Nov 03, 2011 | By Edvard Csanyi
Transformer Winding Faults
A fault on a transformer winding is controlled in magnitude by the following factors: Source impedance Neutral earthing impedance Transformer leakage reactance Fault voltage Winding connection Several distinct cases arise… Read more
Nov 02, 2011 | By Edvard Csanyi
Retro perspective 30 years ago: Metal-Clad or Metal-Enclosed MV Switchgear? What to choose?
There are two types of switchgear commonly applied today for switching and protection of in-plant medium voltage (4.16 kV through 34.5 kV) power distribution systems. One is metal-clad switchgear using draw-out… Read more
Oct 31, 2011 | By Edvard Csanyi
The Importance of the Correct PPE
Whilst awareness of the dangers of arc flash has continued to increase over the last few years, the number of incidents that are still occurring on a daily basis are… Read more
Oct 29, 2011 | By cgoulds
Transformer Testing Techniques
Cant see this video? Click here to watch it on Youtube. Substation transformers can range from the size of a garbage can to the size of a small house; they… Read more
Oct 27, 2011 | By Edvard Csanyi
Power Semiconductor Device – Transistor
Power transistors are used in applications ranging from a few to several hundred kilowatts and switching frequencies up to about 10 kHz. Power transistors used in power conversion applications are… Read more
Oct 27, 2011 | By Edvard Csanyi