Earthing in electrical network – purpose, methods and measurement
The main reason for doing earthing in electrical network is for the safety. When all metallic parts in electrical equipment are grounded then if the insulation inside the equipment fails… Read more
Dec 19, 2011 | jiguparmar
What is the resonance phenomena?
The use of both capacitive and inductive devices in distribution systems leads to resonance phenomena, resulting in extremely high or low impedance values. These variations in impedance modify the current… Read more
Dec 09, 2011 | Edvard
Flexible AC Transmission System – What and Why?
Flexible AC Transmission System (FACTS) have been evolving to a mature technology with high power rating. This technology has wide spread application, became a top rate, most reliable one, based… Read more
Dec 05, 2011 | Edvard
Guideline to Design Electrical Network for Building (Small Area)
Find out built up area in Sqft.of per flat per House/Dwelling unit. Multiply area in Sqft. by Load/Sqft according to following table: Type of Load Load/Sqft Industrial 100 Watt/Sqft Commercial… Read more
Dec 02, 2011 | jiguparmar
Transient Voltage Surge Suppressors
Transient Voltage Surge Suppressor (TVSS) is a device that every data center or mission critical facility should have. Why should every data center have one and what does it do… Read more
Dec 01, 2011 | Edvard
Overvoltages Caused by Direct Lightning Strokes
A lightning stroke is defined as a direct stroke if it hits either the tower or the shield wire or the phase conductor. This is illustrated in Figure 1. When… Read more
Nov 29, 2011 | Edvard
Fire Properties Of Cables
This is an area of increasing public and legislative concern, and therefore of increasing interest to engineers. There have been major advances in the fire performance of cables in recent… Read more
Nov 21, 2011 | Edvard
Partial Discharge Testing On Power Cable Systems
Partial discharge measurement is an important method of assessing the quality of the insulation of power cable systems, particularly for extruded insulation materials. This article considers partial discharge from two… Read more
Nov 18, 2011 | Edvard
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 | 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 | Bipul Raman
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 | Edvard
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 | Edvard
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 | 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 | Edvard
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 | cgoulds
