Energy and Power
What’s common for Beer Mug and Power Factor?
Understanding power factor is not that hard. We have some very common example from the real life you will understand for sure, but first let’s start with some introduction of… Read more
Nov 15, 2012 | By Edvard
Electric Motor
Few Words About Synchronous Machines
There are two main types of synchronous machine: cylindrical rotor and salient pole. In general, the former is confined to 2 and 4 pole turbine generators, while salient pole types… Read more
Nov 06, 2012 | By Edvard
Energy and Power
Aluminium and its Alloys used in Electrical Engineering
Aluminium has been used for many years as a conductor material in almost all branches of electrical engineering. In addition to the pure aluminium, several its alloys are also excellent… Read more
Nov 05, 2012 | By Edvard
Energy and Power
Application of Circuit Breakers in IT Networks
IT supplies are used to prevent that a ground fault leads to immediate disconnection of the affected circuit like in a grounded system. Although a first ground fault results in… Read more
Nov 03, 2012 | By Edvard
Electric Motor
Motors for Hazardous Areas
Electrical drives/motors that are operated in hazardous areas must be built and engineered so that they cannot become an ignition source. This applies not only to normal operating and starting, but also… Read more
Nov 02, 2012 | By Edvard
Energy and Power
Application of 4-pole Switchgear Devices
The majority of low-voltage switchgear is equipped with three contacts in the main circuit, which switch three-phase loads in all poles. In some applications switchgear with four main poles is… Read more
Oct 31, 2012 | By Edvard
Energy and Power
Smart and safe protective shutdown of LV system with selectivity
From the point of view of the operational safety and reliability of an entire low-voltage installation, it is usually desirable to specifically isolate the part of a system affected by… Read more
Oct 30, 2012 | By Edvard
Cables
Corrosion Types Encountered With Power Cables
Introduction Anodic Corrosion (Stray DC Currents) Cathodic Corrosion Galvanic Corrosion Chemical Corrosion AC Corrosion Local Cell Corrosion Other Forms of Corrosion There are numerous types of corrosion, but the ones… Read more
Oct 25, 2012 | By Edvard
Energy and Power
Safety Clearance Recommendations for Transformer
Clearance from Outdoor Liquid Insulated Transformers to Buildings (NEC) Clearance between Two Outdoor Liquid Insulated Transformers (NEC) Dry Type Transformer in Indoor Installation (NES 420.21) Dry Type Transformer in Outdoor… Read more
Oct 24, 2012 | By jiguparmar
Cables
The Good, The Bad and The Ugly Cable Insulation
The fundamental understanding of cable insulation properties forms the foundation for assessment of cable operability. These same fundamentals provide the basis for evaluating whether various electrical and physical tests and… Read more
Oct 23, 2012 | By Edvard
Cables
Cable engineering in substations and power plants
Is it true that single core cable should be unarmored because eddy currents are induced in armor of single core cable which will cause additional losses? If true then why… Read more
Oct 22, 2012 | By Asif Eqbal
Electric Motor
Few Words About Three-Phase Alternator
The three-phase alternator, as the name implies, has three single-phase windings spaced such that the voltage induced in any one phase is displaced by 120º from the other two. A… Read more
Oct 20, 2012 | By Edvard
Energy and Power
Testing and Commissioning of Current Transformer
1. Objective 2. Test Equipment Required 3. Test procedures Mechanical Check and Visual Inspection Insulation Resistance Test Polarity Test Secondary/Loop Resistance Test Burden Test (optional test) Magnetization Curve Test (optional… Read more
Oct 19, 2012 | By Edvard
Energy and Power
Simplify Downstream Installation with Cascading
Cascading provides circuit breakers placed downstream of a limiting circuit breaker with an enhanced breaking capacity. The limiting circuit breaker helps the circuit breaker placed downstream by limiting high short-circuit… Read more
Oct 16, 2012 | By Edvard
Energy and Power
NEC Requirements for Emergency Systems
Emergency systems are generally installed in buildings that are or can be occupied by 1000 or more persons or are more than 75 ft high. These are buildings where artificial… Read more
Oct 12, 2012 | By Edvard
