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Electricity distribution is the final stage in the delivery of electricity. It is generally considered to include medium-voltage (less than 50 kV) power lines, electrical substations and pole-mounted transformers, low-voltage (less than 1000 V) distribution wiring and sometimes electricity meters.
Description
History
In the early days of electricity generation, direct current (DC) generators were connected to loads at the same voltage. The generation, transmission and loads had to be of the same voltage because at the time there was no known way of doing DC voltage conversion (other than inefficient motor-generator sets). The voltages had to be fairly low with such systems due to the fact that it is difficult and dangerous to distribute high voltages to small loads. The losses in a cable are proportional to the square of the current, the length of the cable, and the resistivity of the material, and are inversely proportional to cross-sectional area. Early transmission networks were already using copper, which is one of the best economically feasible conductors for this application. To reduce the current while keeping power transmission constant requires increasing the voltage which, as previously mentioned, was problematic. This meant in order to keep losses to a reasonable level the Edison (DC) system needed thick cables and local generators.Introduction of alternating current
The adoption of alternating current (AC) for electricity generation following the War of Currents dramatically changed the situation. Power transformers, installed at substations, could be used to raise the voltage from the generators and reduce it to supply loads. Increasing the voltage reduced the current in the transmission and distribution lines and hence the size of conductors required and distribution losses incurred. This made it more economic to distribute power over long distances. The ability to transform to extra-high voltages enabled generators to be located far from loads with transmission systems to interconnect generating stations and distribution networks. More on [ Electricity distribution ]
I posted 52 photos on Facebook in the album "Pure Power Distribution" http://bit.ly/278A1n
PurePowerD (PurePowerD) Fri, 06 Nov 2009 20:19:18 -0000
I posted 52 photos on Facebook in the album "Pure Power Distribution" http://bit.ly/278A1n
I wud be more bullish on transmission and distribution cos rather than utilities..all the power generated needs to be carried to homes
shravanraj (Shravan Dharmaraj) Fri, 06 Nov 2009 19:51:50 -0000
I wud be more bullish on transmission and distribution cos rather than utilities..all the power generated needs to be carried to homes
Control and Automation of Electrical Power Distribution Systems: http://bit.ly/1M5yiL
freeebookslink (free ebook) Fri, 06 Nov 2009 19:33:14 -0000
Control and Automation of Electrical Power Distribution Systems: http://bit.ly/1M5yiL
A. Gore backed company has received another stimulus from Obama for clean power distribution, the 2nd in 1 month=over 1,000,000,000 $$
platosthoughts (DEMONS OF DEMOCRACY) Fri, 06 Nov 2009 19:30:51 -0000
A. Gore backed company has received another stimulus from Obama for clean power distribution, the 2nd in 1 month=over 1,000,000,000 $$
SAVE $195.8 - Tripp Lite PDU12IEC 14-Outlet Worldwide Compatible Rackmount Power Distribution Unit (16A, 1U)... http://dealnay.com/98506
unlooses (unlooses) Fri, 06 Nov 2009 15:20:18 -0000
SAVE $195.8 - Tripp Lite PDU12IEC 14-Outlet Worldwide Compatible Rackmount Power Distribution Unit (16A, 1U)... http://dealnay.com/98506
Hiring Power Transmission and Distribution Consultant, Senior http://bit.ly/1frpJX
SmartGridJobs (SmartGridCareers.com) Fri, 06 Nov 2009 14:16:04 -0000
Hiring Power Transmission and Distribution Consultant, Senior http://bit.ly/1frpJX
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