Electronics
Under the Hood of LEDs (Light Emitting Diodes)
LED lamps, or Light Emitting Diodes, are becoming more and more common. Having been used for some time in products such as digital watches, remote controls and brake lights, they are now being seen in many more applications such as… Read more
Sep 08, 2012 | By Paul Blythe
Hydropower
Things You Should Know Before Planning of Hydroelectric Facilities
Hydroelectric plants are located in geographic areas where they will make economic use of hydraulic energy sources. Hydraulic energy is available wherever there is a flow of liquid and head. Head represents potential energy and is the vertical distance through… Read more
Sep 07, 2012 | By Edvard Csanyi
Energy and Power
Transformer Heat, Copper and Iron Losses
The thermal ratings of a transformer are determined by the following three factors: The amount of heat produced in the windings and connections. The amount of heat produced in the iron core. How effectively the heat can be removed from… Read more
Sep 06, 2012 | By Edvard Csanyi
Protection
Transformer differential protection (ANSI 87T)
Transformer differential protection protects against short-circuits between turns of a winding and between windings that correspond to phase-to-phase or three-phase type short-circuits. If there is no earthing connection at the transformer location point, this protection can also be used to… Read more
Sep 05, 2012 | By Edvard Csanyi
HVAC
How to Maximize Chiller Efficiency?
Chillers are the single largest energy-using component in most facilities, and can typically consume over 50% of the electrical usage. Chillers use approximately 20% of the total electrical power generated in North America and the U.S. Department of Energy estimates… Read more
Sep 04, 2012 | By Edvard Csanyi
Energy and Power
Getting Electricity From Solid Oxide Fuel Cell
Abstract Introduction Fuel Cell Working Principle of SOFC Materials Selection and Processing Cathode Electrolyte Anode Interconnection Types of SOFC Merits and Demerits Applications Stationary energy sources Transportation Military applications SOFC-GT Conclusions Electricity is no more a luxury but it has… Read more
Sep 03, 2012 | By vinod ramireddy
Power Substation
Transformers Connected Directly to Generators
Power transformers connected directly to generators can experience excitation and short-circuit conditions beyond the requirements defined by ANSI/IEEE standards. Special design considerations may be necessary to ensure that a power transformer is capable of withstanding the abnormal thermal and mechanical aspects that… Read more
Sep 01, 2012 | By Edvard Csanyi
Transformers
Using Tap Changers to Match the System Voltage
A transformer’s rated voltage may not match the system voltage exactly, or it may be necessary to raise or lower the output voltage to supply a certain load. In these cases, a portion of a winding can be removed or… Read more
Aug 31, 2012 | By Edvard Csanyi
Electric Motor
Motor protection depending on size and voltage level
Motor protections vary widely depending on the size of the motor and voltage level involved, thus only the more common ones are discussed in this technical article. Index Motor Instantaneous Over-current Protection Motor Timed Over-Current Protection Thermal OverLoad Motor Ground… Read more
Aug 30, 2012 | By Edvard Csanyi
Transformers
Purpose of Shielded Isolation Transformer
A shielded transformer is a two-winding transformer, usually delta–star connected and serves the following purposes: – Voltage transformation from the distribution voltage to the equipment’s utilization voltage. – Converting a 3-wire input power to a 4-wire output thereby deriving a separate stable… Read more
Aug 29, 2012 | By Edvard Csanyi
Renewable Energy
Innovative Approach to Maglev Trains (Solar Energy)
Now a days rail transport become a cheap means of transport to any class of people and for the working of the trains it requires some energy in the form of Electrical finally to convert in to mechanical support for… Read more
Aug 28, 2012 | By vinod ramireddy
Energy and Power
What is a Floating Neutral and how does it affect the power distribution
If the Neutral Conductor is opened, broke or lost at either of its source side (distribution transformer, generator) or at load side (distribution panel of a consumer), the distribution system’s neutral conductor will “float” or lose its reference ground Point…. Read more
Aug 27, 2012 | By Jignesh Parmar
Energy and Power
An Overview of Combined Cycle Power Plant
The Combined Cycle Power Plant or combined cycle gas turbine, a gas turbine generator generates electricity and waste heat is used to make steam to generate additional electricity via a steam turbine. The gas turbine is one of the most… Read more
Aug 25, 2012 | By vinod ramireddy
Transformers
Power Transformer Construction – Windings
Continued from tech. article: Power Transformer Construction – Core The windings consist of the current-carrying conductors wound around the sections of the core, and these must be properly insulated, supported and cooled to withstand operational and test conditions. The terms winding… Read more
Aug 24, 2012 | By Edvard Csanyi
Transformers
Power Transformer Construction – The Core
The construction of a power transformer varies throughout the industry. The basic arrangement is essentially the same and has seen little significant change in recent years, so some ofthe variations can be discussed in this article. The core, which provides… Read more
Aug 23, 2012 | By Edvard Csanyi
