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Monthly Archive for: «June, 2012»

Electric Motor

Advantages of Variable Speed Motors

Most motors are designed to operate at a constant speed and provide a constant output. While in many cases this may be more than adequate, it is not in all…. Read more

Jun 13, 2012 | By Edvard

Danfoss AKD Variable Speed Drives
Transformers

Scott-T Transformer Connection Overview

There are two main reasons for the need to transform from three phases to two phases: to give a supply to an existing two phase system from a three phase… Read more

Jun 12, 2012 | By jiguparmar

Largest furnace transformer with 105-MVA capacity manufactured at Siemens transformer factory in Dresden
Transformers

Star-Delta Transformer Connection Overview

In this type of transformer connection, then primary is connected in star fashion while the secondary is connected in delta fashion as shown in the Figure 1 below. The voltages… Read more

Jun 10, 2012 | By jiguparmar

General Electric power transformer nameplate (50 MVA Substation Power Transformer with Load Tap Changer)
Smart Grid

Smart Grid Communications Overview

An electricity grid without adequate communications is simply a power “broadcaster.” It is through the addition of two-way communications that the power grid is made “smart.” Smart grid communications enables… Read more

Jun 09, 2012 | By Edvard

Solutions for powerline, wireless, and serial communications
Energy and Power

MCB – Miniature Circuit Breaker Construction

The miniature circuit breaker (MCB) plays an important role in providing overcurrent protection and a disconnect means in electrical networks. Recent advancements in circuit breaker technology has increased breaker performance and protection…. Read more

Jun 07, 2012 | By Edvard

MCB - Miniature circuit breaker construction
Electrical Lectures

Fundamental Characteristics of Circuit Breaker

The fundamental characteristics of a circuit breaker are: Its rated voltage Ue Its rated current In Its tripping current level adjustment ranges for overload protection (Ir or Irth) and for short… Read more

Jun 05, 2012 | By Edvard

Fundamental characteristics of circuit breakers
Energy and Power

Understanding Vector Group of Transformer (2)

Continued from first part Understanding Vector Group of Transformer (part 1) Vector Groups are the IEC method of categorizing the primary and secondary winding configurations of 3-phase transformers. Windings can… Read more

Jun 04, 2012 | By jiguparmar

220kV Class 110kV Class Single Phase Traction Transformer
Energy and Power

Understanding Vector Group of Transformer (Part 1)

Three phase transformer consists of three sets of primary windings, one for each phase, and three sets of secondary windings wound on the same iron core. Separate single-phase transformers can… Read more

Jun 03, 2012 | By jiguparmar

Understanding Vector Group of Transformer (Part 1)


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