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Technical Articles

Energy and Power

Power measurement in a three-phase system

Electrical power is measured with a wattmeter. A wattmeter consists of a current coil connected in series with load, while the other potential coil is connected parallel with load. Depending… Read more

Jan 19, 2013 | By Edvard

Power Measurement In a Three-Phase System
Cables

Underground residential distribution layouts

Where general appearance, economics, congestion, or maintenance conditions make overhead construction inadvisable, underground construction is specified. While overhead lines have been ordinarily considered to be less expensive and easier to… Read more

Jan 18, 2013 | By Edvard

Underground residential distribution layouts
Transformers

D.M.C.R. Protection Relay for Oil Transformer

Introduction to D.M.C.R. Faults detected on live transformer unit: Dielectric fluid level is detected as low Overheating is detected Excess pressure is detected Standards Possibilities of D.M.C.R.: Oil level control… Read more

Jan 16, 2013 | By Edvard

DMCR - Detection, Measurement and Control Relay for Hermetically Sealed Oil Transformer
High Voltage

Purpose of Disconnect Switches In HV Substation

Switches may be of several types, the common characteristic is that none are designed to interrupt fault currents and the insulation or insulators associated with them must coordinate with the… Read more

Jan 14, 2013 | By Edvard

Purpose of Disconnect Switches In HV Substation (on photo: Siemens Goab switch)
Cables

Testing and Commissioning of MV/HV Cables

Compare cable data with drawings and specifications. Inspect exposed sections of cables for physical damage. Inspect bolted electrical connections for high resistance using one or more of the following methods: Use… Read more

Jan 12, 2013 | By Edvard

Testing and Commissioning of MV/HV Cables
Testing and Commissioning

Testing and Commissioning of Substation DC System

Power substation DC system consists of battery charger and battery. This is to verify the condition of battery and battery charger and commissioning of them. Following instruments will be used… Read more

Jan 09, 2013 | By Edvard

Testing and Commissioning of Substation DC System
High Voltage

Environmental Stresses On External Insulation

The external insulation (transmission line or substation) is exposed to electrical, mechanical, and environmental stresses. The applied voltage of an operating power system produces electrical stresses. The weather and the… Read more

Jan 07, 2013 | By Edvard

Environmental Stresses On External Insulation
Wind Power

Geographical Variation in the Wind Resource

Ultimately the winds are driven almost entirely by the sun’s energy, causing differential surface heating. The heating is most intense on land masses closer to the equator, and obviously the greatest heating… Read more

Jan 04, 2013 | By Edvard

Geographical Variation in the Wind Resource
Electronics

The Future of MOS-Controlled Thyristor (MCT)

The MCT is type of power semiconductor device that combines the capabilities of thyristor voltage and current with MOS gated turn-on and turn-off. It is a high power, high frequency,… Read more

Jan 01, 2013 | By Edvard

MOS Controlled Thyristor


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