Electric Motor
Basics of 3-phase Induction Motor (part 2)
Continued from first part – Basics of 3-phase Induction Motor (part 1) For the purpose of standardization, the preferred rated voltages of three phase induction motor shall be in accordance with IS 12360: 1988. The voltages for three phases, 50… Read more
Aug 02, 2012 | By Asif Eqbal
Electric Motor
Basics of 3-phase Induction Motor (part 1)
This article will deal with those concepts of 3 phase induction motor which are essential prerequisite for proper selection, procurement, installation and maintenance of the same. Before any actual discussion on motor is started It will better to have a… Read more
Aug 01, 2012 | By Asif Eqbal
Cables
Sizing and protection of the neutral conductor (2)
Continued from the first part – Sizing and Protection of the Neutral Conductor (1) If the neutral conductor is correctly sized (including harmonics), no specific protection of the neutral conductor is required because it is protected by the phase protection. If… Read more
Jul 31, 2012 | By Edvard Csanyi
Cables
Sizing and protection of the neutral conductor (1)
Sizing (c.s.a.) and the protection of the neutral conductor, apart from its current-carrying requirement, depend on several factors, namely: The type of earthing system, TT, TN, etc. The harmonic currents The method of protection against indirect contact hazards according to… Read more
Jul 30, 2012 | By Edvard Csanyi
Energy and Power
Guidelines to Visual inspection of Electrical Installations
In general terms we are inspecting the installation with regard to personal safety, equpment age, deterioration, equipment corrosion and overload. Suitability and external influence to the power system should also be included. At this point it is a good idea to… Read more
Jul 28, 2012 | By Edvard Csanyi
Cables
Types of Cable Installations in Electrical Network
There are a variety of ways to install power distribution cables. Each method ensures distribution of power with a unique degree of reliability, safety, economy, and quality for any specific set of conditions. These conditions include the electrical characteristics of… Read more
Jul 27, 2012 | By Edvard Csanyi
Energy and Power
Overvoltages in the IT system
Electrical networks can be subject to overvoltages of varying origins. Some overvoltages, such as differential mode ones (between live conductors) affect all the earthing systems. This section is particularly concerned with common mode overvoltages, which mainly affect the IT system… Read more
Jul 26, 2012 | By Edvard Csanyi
Energy and Power
The major components of an Air Circuit Breaker and the Arc Interruption
The basic characteristics for air magnetic circuit breakers are maximum rationalization and constructional simplicity. The major components of such breakers are: the poles, the arc chutes, the base frame, the operating mechanism. The operating mechanism construction and parts are similar to that of… Read more
Jul 25, 2012 | By Edvard Csanyi
Energy and Power
The main components of an oil circuit breaker and how does it interrupt the arc
They are simple in construction. The major parts of a minimum oil circuit breaker excluding the poles are the base frame,the drive which is constructed as a stored energy opening and closing mechanism (the operating mechanism). The opening spring of… Read more
Jul 24, 2012 | By Edvard Csanyi
Energy and Power
Isolating the Fault With Time-based Discrimination
Protection functions form a consistent system depending on the overall structure of the power distribution system and the neutral earthing arrangement. They should therefore be viewed as a system based on the principle of discrimination, which consists of isolating the… Read more
Jul 22, 2012 | By Edvard Csanyi
Energy and Power
Bus Design In Aboveground Substations
Substations can be constructed partly or entirely within aboveground or belowground enclosures. However, cost is high and complexity is increased by fire-protection and heat-removal needs. The following discussion deals with exposed aboveground substations. The bus and associated substation equipment are… Read more
Jul 21, 2012 | By Edvard Csanyi
Energy and Power
Effect of Lightning Strike on Electrical Lines
The foregoing discussion concentrated on the principles of lightning strikes and how their effects can be mitigated. However, lightning strikes on electrical lines or substations are those that cause problems in the distribution network which come right into our residences… Read more
Jul 20, 2012 | By Edvard Csanyi
Electric Motor
AC Adjustable Speed Drive (ASD) – An Overview
The simplest and least expensive way to control the speed of a process or piece of equipment is to operate all the equipment at full speed. Many applications require the speed of a process or piece of equipment to be… Read more
Jul 19, 2012 | By Edvard Csanyi
Cables
Mark the ground with an X and say Dig Here!
No matter what method is used for fault locating on direct buried underground cable, at some point an “x” must be marked on the ground to say “dig here.” The most commonly used prelocation methods such as arc reflection or… Read more
Jul 18, 2012 | By Edvard Csanyi
High Voltage
Shunt Reactor Used In HV and EHV Systems
Main Power System parameters are System Voltages and Frequency which normally indicate the healthiness level (they indicate the level of Generated active and reactive Powers against the load power requirement). In a healthy system, Voltage and frequency are close to… Read more
Jul 17, 2012 | By Edvard Csanyi
