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Monthly Archive for: «November, 2011»

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 | Edvard

TKxP Power MOSFETs in DPAK Package from Toshiba

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 | Edvard

Danfoss - VLT AutomationDrive Series

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 | Edvard

ABB Motors and Drives

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 | Edvard

KBS cable coating fire protection

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 | Edvard

On-Line Partial Discharge Testing 27.6 kV XLPE Cable

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 | Edvard

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

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 | Bipul Raman

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


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