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Technical Articles / EEP Authors

Technical Articles In November, 2011

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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, one way to get to this goal (increased capacity), is… Read more

Nov 28, 2011 | By

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 potentially attractive for switching applications. They are essentially voltage-driven rather… Read more

Nov 27, 2011 | By

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 from energy savings. In general, variable speed drives are used… Read more

Nov 25, 2011 | By

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 of resistors, you may simply be given ¼ Watt resistor…. Read more

Nov 24, 2011 | By

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 can be reduced in two main ways – by implementing… Read more

Nov 23, 2011 | By

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 years, and table below lists some of the relevant standards…. Read more

Nov 21, 2011 | By

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 points of view: the measurement of all partial discharges occurring… Read more

Nov 18, 2011 | By

On-Line Partial Discharge Testing 27.6 kV XLPE Cable
High Voltage

North American versus European distribution systems

Distribution systems around the world have evolved into different forms. The two main designs are North American and European. For both forms, hardware is much the same: conductors, cables, insulators, surge arresters, regulators, and transformers are very similar. Both systems… Read more

Nov 17, 2011 | By

North American versus European distribution systems
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 is an indication of the oil’s ability to withstand electrical…...

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Nov 15, 2011 | By

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 pivoted as to be acted upon by the magnetic field… Read more

Nov 13, 2011 | By

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


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