Using HVDC Technology For Transmitting Electricity
An alternate means of transmitting electricity is to use high-voltage direct current (HVDC) technology. As the name implies, HVDC uses direct current to transmit power. Direct current facilities are connected… Read more
Mar 05, 2012 | By Edvard

Protection and Relays Used In Main Circuit Board at a Power Grid Substation
The DMH type relay provides high speed biased differential protection for two or three winding transformers. The relay is immune to high inrush current and has a high degree of… Read more
Feb 17, 2012 | By Bipul Raman

Protection Of Generators And Transformers
As Generators and transformers are major components of a power system, so it is quite necessary to take all the preventive measures for the protection of transformers and generators. These… Read more
Feb 11, 2012 | By Bipul Raman

Ceramic (Porcelain and Glass) Insulators
Porcelain is the most frequently used material for insulators. Insulators are made of wet, processed porcelain. The fundamental materials used are a mixture of feldspar (35%), china clay (28%), flint… Read more
Jan 27, 2012 | By Edvard

EHV/HV Underground Cable Sheath Earthing (part 2/2)
Continued from previous part: EHV/HV Cable Sheath Earthing (part 1/2) Link Box is electrically and mechanically one of the integral accessories of HV underground above ground cable bonding system, associated… Read more
Jan 21, 2012 | By Edvard

EHV/HV Underground Cable Sheath Earthing (part 1/2)
In urban areas, high voltage underground cables are commonly used for the transmission and distribution of electricity. Such high voltage cables have metallic sheaths or screens surrounding the conductors, and/or… Read more
Jan 19, 2012 | By jiguparmar

Segregated Phase Bus System
In this construction all the phases are housed in one metallic enclosure as earlier, but with a metallic barrier between each phase, as illustrated in Figure 1. The metallic barriers provide the required… Read more
Jan 18, 2012 | By Edvard

Direct high voltage testing of cable insulation systems
DC testing has been accepted for many years as the standard field method for performing high-voltage tests on cable insulation systems. Whenever DC testing is performed, full consideration should be… Read more
Nov 19, 2011 | By Edvard

North American versus European distribution systems
Distribution systems around the world have evolved into different forms. The two main designs are North American and European. For both forms, hardware is much the same: conductors, cables, insulators,… Read more
Nov 17, 2011 | By Edvard

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

Be extremely careful when racking in and racking out circuit breaker
There are many reasons causes arc flash incidents. Some of arc flash explosions occur when substation personnel insert or remove (rack in or out) circuit breakers from low or high… Read more
Oct 11, 2011 | By Edvard

Typical Constructions Of Overhead Lines
Along streets, alleys, through woods, and in backyards, many of the distribution lines that feed customers are overhead structures. Because overhead lines are exposed to trees and animals, to wind… Read more
Oct 03, 2011 | By Edvard

What is the Static Var Compensator (SVC)?
Static Var Compensator is “a shunt-connected static Var generator or absorber whose output is adjusted to exchange capacitive or inductive current so as to maintain or control specific parameters of… Read more
Sep 25, 2011 | By Edvard

Understanding Underground Electric Transmission Cables
Underground cables have different technical requirements than overhead lines and have different environmental impacts. Due to their different physical, environmental, and construction needs, underground transmission generally costs more and may… Read more
Sep 21, 2011 | By Bipul Raman

GIS vs AIS – Substation Earthing
Compressed SF6 gas used in MV and HV switchgears as an insulating medium has led to the development of compact gas-insulated substation (CIS) technology (figure 1). GIS , having many… Read more
Sep 12, 2011 | By Edvard
