Monthly Archive for: «September, 2011»

Complete overview of lightning arresters (part 2)

Continued from article Complete overview of lightning arresters (part 1) What is a surge arrester? Surge arresters are devices that help prevent damage to apparatus due to high voltages. The arrester provides a low-impedance… Read more

Sep 29, 2011 | jiguparmar

Complete overview of lighting arresters

Smart Ways to Save Money with Alternative Energy

Alternative energy is currently a hot button topic. Whether your desire to use alternative energy stems from concern for the environment or a desire to create a healthier home, you will benefit financially from… Read more

Sep 28, 2011 | mirha494

How solar collectors works?

Solar energy (solar radiation) is collected by the solar collector’s absorber plates. Selective coatings are often applied to the absorber plates to improve the overall collection efficiency. A thermal fluid absorbs the energy collected…. Read more

Sep 26, 2011 | Edvard

Solar collector

What is the Static Var Compensator (SVC)?

Static Var Compensator is “a shunt-connected static Var generator or absorber whose output is adjusted to exchange capacitive or inductive current so as to maintain or control specific parameters of the electrical power system… Read more

Sep 25, 2011 | Edvard

The Siemens Static Var Compensator in the Radsted high-voltage switchgear station

Diagnosing Transformer Winding Insulation (video)

This video tutorial shows the progression of power factor or dissipation factor over frequency. Furthermore, measuring transformer winding insulation, including the connection of measuring leads, is explained. Reasons why recording frequency responses is important… Read more

Sep 25, 2011 | Edvard

Ionization (Corona Discharge) Tests

The ionization test is used primarily for detecting ionization (corona discharge) and slot discharge in generator windings. Both ionization and slot discharge may cause deterioration of insulation. Ionization generally occurs in voids inside the… Read more

Sep 24, 2011 | Edvard

End winding of generator - Partial discharge

Complete overview of lightning arresters (1)

Lightning and Voltage Surge Lightning can create voltage surges in several of the following ways. Lightning can score a direct hit on your house. It can strike the overhead power line which enters your… Read more

Sep 23, 2011 | jiguparmar

Complete overview of lighting arresters

Understanding Transformer Polarity

With power or distribution transformers, polarity is important only if  the need arises to parallel transformers to gain additional capacity or to  hook up three single-phase transformers to make a three-phase bank.   The way… Read more

Sep 23, 2011 | Edvard

Understanding Underground Electric Transmission Cables

Underground cables // Underground cables have different technical requirements than overhead lines and have different environmental impacts. Due to their different physical, environmental, and construction needs, underground transmission generally costs more and may be… Read more

Sep 21, 2011 | Bipul Raman

Underground XLPE cables left to right: 345 kV, 138 kV, 69 kV, and distribution

Typical servo motors data – ABB

Torque constant The torque constant is an important measure given to the synchronous servo motor. It is expressed as Nm/A and determines how much torque is produced per ampere. Back EMF The permanent magnet… Read more

Sep 20, 2011 | Edvard

ABB servo motors 9C series for high performance machinery drives
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