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Monthly Archive for: «November, 2011»

Transmission and Distribution

What is the reason beyond three phase transmission?

As the need for increased transmission line capacity have forced power utility and owner to maximize power density in existing transmission corridors.  Many experienced have already been done on this,… Read more

Nov 28, 2011 | By Edvard

Three-phase electric power systems
Electronics

Power Semiconductor Device – MOSFET

Power MOSFETs are marketed by different manufacturers with differences in internal geometry and with different names such as MegaMOS, HEXFET, SIPMOS, and TMOS. They have unique features that make them… Read more

Nov 27, 2011 | By Edvard

TKxP Power MOSFETs in DPAK Package from Toshiba
Electric Motor

Why do we need variable speed drives (VSD)?

There are many and diverse reasons for using variable speed drives. Some applications, such as paper making machines, cannot run without them while others, such as centrifugal pumps, can benefit… Read more

Nov 25, 2011 | By Edvard

Danfoss - VLT AutomationDrive Series
Electronics

A Look at the Power Rating of Resistors

You may be asked: “what is the power rating of the resistors you want to buy?” when buying a resistor to build a certain circuit. For the most standard class… Read more

Nov 24, 2011 | By elaina

Figure 1 - Common form of resistor
Electric Motor

Motors And Drives For Efficient Control – ABB

With electric motors accounting for an estimated 65 percent of industrial energy use, any increases in efficiency clearly provide the potential for major savings. The energy consumption of electric motors… Read more

Nov 23, 2011 | By Edvard

ABB Motors and Drives
Cables

Fire Properties Of Cables

This is an area of increasing public and legislative concern, and therefore of increasing interest to engineers. There have been major advances in the fire performance of cables in recent… Read more

Nov 21, 2011 | By Edvard

KBS cable coating fire protection
Cables

Partial Discharge Testing On Power Cable Systems

Partial discharge measurement is an important method of assessing the quality of the insulation of power cable systems, particularly for extruded insulation materials. This article considers partial discharge from two… Read more

Nov 18, 2011 | By Edvard

On-Line Partial Discharge Testing 27.6 kV XLPE Cable
Premium Content ♛

What Standards To Use For Transformer Oil Testing?

ASTM (American Society for Testing and Materials) has developed the standards for oil testing. The following tests we recommended for a complete analysis of a transformer’s oil: The dielectric breakdown…...

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Nov 15, 2011 | By Edvard

ASTM standards for transformer oil testing and complete analysis of a transformer’s oil
Energy and Power

Moving Iron Instruments – Voltmeter and Ammeter

Moving-iron instruments are generally used to measure alternating voltages and currents. In moving-iron instruments the movable system consists of one or more pieces of specially-shaped soft iron, which are so… Read more

Nov 13, 2011 | By Bipul Raman

Analog ammeter and voltmeter designed to measure a.c. current and a.c. voltage


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