220V DC system at thermal power station
The 220V DC system supplies direct current as source of operating power for control, signaling, relays, tripping and closing of switchgears, emergency motors of most important auxiliary systems. Under normal… Read more
Feb 15, 2012 | By Bipul Raman
Types of neutral earthing in power distribution (part 2)
Resistance grounding has been used in three-phase industrial applications for many years and it resolves many of the problems associated with solidly grounded and ungrounded systems. Resistance Grounding Systems limits… Read more
Feb 09, 2012 | By jiguparmar
Discussing About LV And HV Electrical Cables
Space is really a critical criterion when discussing electrical cables and wires. In a low-voltage (LV) plastic-sheathed cable with conductor cross-sections of up to 10 mm2 per conductor or in… Read more
Feb 08, 2012 | By Edvard Csanyi
Types of neutral earthing in power distribution (part 1)
In the early power systems were mainly Neutral ungrounded due to the fact that the first ground fault did not require the tripping of the system. An unscheduled shutdown on… Read more
Feb 06, 2012 | By jiguparmar
About Permeability And Permitivity
The strength of electric field or electrostatic force strength or intensity of field (all synonymous terms) is measured & expressed in terms of force experienced by unit positive charge placed… Read more
Feb 01, 2012 | By Asif Eqbal
Using VLT AQUA Drive in submersible pump application
The system consists of a submersible pump controlled by a Danfoss VLT AQUA Drive and a pressure transmitter. The transmitter gives a 4-20 mA feedback signal to the VLT AQUA… Read more
Jan 30, 2012 | By MarkoCvrkota
Glossary of Medium Voltage Switchgear Terms
This glossary was published originally by Schneider Electric and it is intended to cover the meaning of many common words and phrases used in association with medium voltage switchgear. Many… Read more
Jan 25, 2012 | By Edvard Csanyi
Anti Pumping And Lockout Relays
What is ANSI code for Antipumping relay? ANSI codes 94 or even 52 can be used. Relays can be divided into six functional categories shown below: Detect defective lines, defective… Read more
Jan 23, 2012 | By Asif Eqbal
UK Electrical Industry British Standards (BS)
These standards are the whole of the prescriptions on the basis of which machines, apparatus, materials and the installations should be designed, manufactured and tested so that efficiency and function… Read more
Jan 20, 2012 | By Edvard Csanyi
How lightning really works? (video)
A lightning discharge develops in three stages: first, the collisions between ice particles and water droplets together with gravity separate positive and negative charges inside the thunder cloud and buildup… Read more
Jan 17, 2012 | By Edvard Csanyi
What Is The Potential Difference?
Potential difference is the term used to describe how large the electrostatic force is between two charged objects. If a charged body is placed between two objects with a potential difference, the charged body will try to… Read more
Jan 13, 2012 | By Edvard Csanyi
Effective Resistance Of Busbars
The construction of busbar is usually carried out by putting together several flat bars in parallel for each phase. The spacing between the bars is made equal to their thickness for practical reasons, and… Read more
Jan 12, 2012 | By Edvard Csanyi
Operation Of Potentially Explosive Installations – The Directive 99/92/EC
In addition to the 94/9/EC Directive, which regulates how explosion protected equipment and protective systems are placed on the market and the design, construction and quality requirements to be met by them, the… Read more
Jan 09, 2012 | By Edvard Csanyi
Voltage and Current Phase Relationships in an Inductive Circuit
Any change in current in a coil (either a rise or a fall) causes a corresponding change of the magnetic flux around the coil. Because the current changes at its… Read more
Jan 05, 2012 | By Edvard Csanyi
The Need for Breaker Failure Protection
Circuit breakers are strategically located in power systems to connect circuits and electrical apparatus. Circuit breakers are commanded to open and close by protection and control systems that monitor conditions… Read more
Jan 01, 2012 | By Edvard Csanyi