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Topic: Power transmission

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Power engineering

Power factor

Auxiliary power

Distributed generation

Electricity generation

Electric power transmission

Transmission (mechanics)

Electrical engineering

Electric power

Electricity distribution

Three phase power

Electricity meter

Transformer

Electric motor

HVDC

	Electric power transmission - Wikipedia, the free encyclopedia
		Typically power transmission is between the power plant and a substation in the vicinity of a populated area.
		The separation of transmission and generation functions is one of the factors that contributed to the 2003 North America flout.
		Transmission and distribution losses in the USA were estimated at 7.2% in 1995 [1], and in the UK at 7.4% in 1998.
	en.wikipedia.org /wiki/Electric_power_transmission (2487 words)

	Power transmission - Wikipedia, the free encyclopedia
		Power transmission is the movement of energy from its place of generation to a location where it is applied to performing useful work.
		Power may also be transmitted by changing electromagnetic fields or by radio waves; microwave energy may be carried efficiently over short distances by a waveguide.
		Mechanical power may be transmitted directly using a solid structure such as a driveshaft; transmission gears can adjust the amount of torque or force vs. speed in much the same way an electrical transformer adjusts voltage vs current.
	en.wikipedia.org /wiki/Power_transmission (495 words)

	Learn more about Electric power transmission in the online encyclopedia. (Site not responding. Last check: 2007-11-07)
		The rapid industrialization in the 20th century made electric power transmission lines and grids a critical part of the economic infrastructure in most industrialized nations.
		It is necessary to transmit the electricity at high voltage to reduce the percentage loss of power over long distances: for a given cable the loss of power is proportional to the square of the current, while for a given transported power, this current is inversely proportional to the voltage.
		Transmission and distribution losses in the USA were estimated at 7.2% in 2003 [1], and in the UK at 7.4% in 1998 [1].
	www.onlineencyclopedia.org /e/el/electric_power_transmission.html (627 words)

	Encyclopedia: Electric power transmission (Site not responding. Last check: 2007-11-07)
		A power station (also power plant) is a facility for the generation of electric power.
		An aerial substation A substation is the part of an electricity transmission and distribution system where voltage is transformed generally from high to low using transformers.
		The separation of transmission and generation functions is one of the factors that contributed to the 2003 North America flout.
	www.nationmaster.com /encyclopedia/Electric-power-transmission (702 words)

	Read about Power transmission at WorldVillage Encyclopedia. Research Power transmission and learn about Power ... (Site not responding. Last check: 2007-11-07)
		Power is defined formally as units of energy per unit
		conductors used to transmit power over great distances; another set of transformers is required to step it back down to safer or more usable voltage levels at destination.
		Power (and energy) may be transmitted by physically transporting chemical or
	encyclopedia.worldvillage.com /s/b/Power_transmission (274 words)

	Power Transmission (Site not responding. Last check: 2007-11-07)
		After power is generated at a generation plant, the voltage is "stepped up" by a transformer to give it the "push" to travel long distances.
		Transmission lines are usually on steel lattice towers, steel poles or double wooden poles.
		Power coming into your residence is usually 120 V or 220 V. Electrical substations perform many functions in controlling and transferring power in an electric system.
	www.ece.umr.edu /links/power/electric.htm (580 words)

	Power flow on transmission lines
		The ratio of return power to forward power is therefore the (modulus of gamma) squared.
		The moral of this tale is that the length of cable connecting the generator to the load makes a critical engineering difference to the efficiency of power transmission, in cases where there is a mismatch at the load end of the cable.
		However, this will not necessarily result in the highest efficiency of power transmission from generator to load; such efficiency would only be 50% for a matched load of 50 ohms in our example, and we have seen that we can do better than that.
	www.ee.surrey.ac.uk /Personal/D.Jefferies/powerflow.html (1176 words)

	Project Tesla: Wireless Transmission of Power
		In this paper, the terms pertinent to wireless transmission of power will be explained and the methods being used by present researchers in a recreation of the Tesla's 1899 Colorado Springs experiments will be defined.
		Much of this power is wasted during transmission from power plant generators to the consumer.
		Power insertion and retrieval losses will be analyzed after the measurements taken during the transmission are recorded.
	www.geocities.com /Area51/Shadowlands/9654/tesla/projecttesla.html (3750 words)

	Howstuffworks "How Power Grids Work"
		Electrical power is a little bit like the air you breathe: You don't really think about it until it is missing.
		It is only during a power failure, when you walk into a dark room and instinctively hit the useless light switch, that you realize how important power is in your daily life.
		Power travels from the power plant to your house through an amazing system called the power distribution grid.
	www.howstuffworks.com /power.htm (223 words)

	Upgrading Transmission Capacity for Wholesale Electric Power Trade
		Power transformers are used in generating stations to raise the voltage of the produced power from the generation voltage to transmission voltage; in distribution substations to reduce the voltage of the power delivered to the distribution system voltage; and elsewhere to connect together transmission systems designed at different voltages.
		The actual temperatures occurring in the transmission line equipment depend on the current, that is the rate of flow of the electrons, and also on ambient weather conditions, such as temperature, wind speed, and wind direction, because the weather effects the dissipation of the heat into the air.
		The bulk power system is designed and operated to provide continuity of service in the case of possible contingencies such as: loss of a generation unit, loss of a transmission line, or a failure of any other single component of the system.
	www.eia.doe.gov /cneaf/pubs_html/feat_trans_capacity/w_sale.html (5896 words)

	Microwave power transmission
		Microwave power transmission (MPT) is the practice of using microwaves to transmit power through outer space or the atmosphere without the need for wires.
		Following the oil crises of the 1970s, NASA researched power transmission via microwaves and developed the idea of the solar power satellite (SPS).
		Microwave power would need to be transmitted with high efficiency, high levels of safety would have to be maintained, and scientific analysis of the impact of microwaves on the space plasma environment as well as the Earth's atmosphere would have to be undertaken.
	www.fact-index.com /m/mi/microwave_power_transmission.html (332 words)

	The Wireless Transmission of Electrical Power
		The Wardenclyffe plant was a major milestone in Tesla's researches into the application of alternating electrical currents to wireless communications and power transmission, an effort which drew a considerable amount of Tesla's attention during the period between 1891 and 1912.
		More important than this, however, will be the transmission of power, without wires, which will be shown on a scale large enough to carry conviction.
		Had he been able to complete the prototype station on Long Island and use it to demonstrate the feasibility of wireless power transmission then a plan would have been implemented for the construction of a pilot plant for this larger system at Niagara Falls, site of the world's first commercial three phase AC power plant.
	www.tfcbooks.com /articles/tws8c.htm (817 words)

	Power Transmission, your industrial transmission repair source for Allison transmissions, ZF transmissions
		All transmission rebuilds are updated to the latest factory specifications as a part of the rebuild process.
		All Power Transmission rebuilds are tested on our factory certified dyno to ensure they meet strict Spicer Clark-Hurth and ZF transmission factory rebuild standards before they leave one of our facilities!
		Power Transmission rebuild quality is as ZF transmissions and Allison transmission technical personnel.
	www.power-transmission.net (202 words)

	Power transmission. - Mechanical Engineering and Machinery - What's Been Published
		Rotary power transmission design / edited by Ken Hurst in association with SEED Ltd., Sharing Experience in Engineering Design.
		Power transmission : mechanical, hydraulic, pneumatic, and electrical / Thomas E. Scott.
		Power transmission and vibration considerations in design [by] Terance V. Duggan.
	www.pitbossannie.com /rps-tj-power-transmission.html (111 words)

	Product Information [Power Transmission Lines]Furukawa Electric Co.,Ltd. (Site not responding. Last check: 2007-11-07)
		In view of the rapid increase in power consumption and the increasingly large distance between power stations and cities, "high-voltage transmission", in which a single power transmission line is used to transmit a larger amount of electricity without loss, is the most effective method for achieving a stable power supply.
		These wires are used to control the operation of unmanned power stations or substations and to enable communication between power stations, encouraging electric power companies to advance into the field of communication business.
		It is the world's largest-scale DC power transmission line, capable of achieving a power transmission capacity of 2,800 MW, and is being constructed using the DC 500-kV bipolar one-line method.
	www.furukawa.co.jp /english/product/soden1_e.htm (508 words)

	Industrial Supply - Better Solutions to All Your Problems - Community Message Board at Skincareindia.com (Site not responding. Last check: 2007-11-07)
		Emerson Power Transmission Corporation - EPT is a producer of power transmission drives, components, and bearings.
		Power Transmission Technology Inc. - A manufacturer of clutches, brakes, torque limiters, and power take-offs for heavy industries.
		R and M Bearings - Suppliers of bearings and power transmission equipment since 1983 in the Tayside and Fife Regions of Scotland, now exporting worldwide.
	www.skincareindia.com /special/cat.asp?/Business/Industrial_Goods_and_Services/Industrial_Supply/Power_Transmission (4832 words)

	PBS: Tesla - Master of Lightning: Understanding Electricity - Power Transmission: Two Simple Equations
		Because of the shell arrangements of electrons in various atoms and molecules, some substances are quite good at allowing a few electrons to move about freely (e.g., copper, silver, gold, aluminum), and some not (e.g., sulfur, rubber, quartz).
		This formalizes the idea that if lots of electrons are propelled with great electrical force the result is more power than if fewer are moved and with less force.
		More importantly, the ability to generate and send electrical power over long transmission lines and then to use it efficiently at the other end depends crucially on the practical possibility of swapping large currents into high voltages and back again in the basic power equation.
	www.pbs.org /tesla/ins/ins_simpeq.html (468 words)

	ipedia.com: Electric power transmission Article (Site not responding. Last check: 2007-11-07)
		Electricity is transmitted from remote electricity generation power plants and sold to end consumers by r...
		The current mainstream scientific view with regard to the health concerns voiced about living in proximity to transmission lines is that they are unlikely to pose any increased risk with regard to cancer and other somatic diseases.
		For a detailed discussion of this topic, including references to many of the scientific studies, see the Power Lines and Cancer FAQ.
	www.ipedia.com /electric_power_transmission.html (680 words)

	General Supplies - Power Transmission (Site not responding. Last check: 2007-11-07)
		EPT is a producer of power transmission drives, components, and bearings.
		Power transmission distributor offering a variety of services from engineering assitance to the sale of parts and supplies.
		Power transmission couplings, including gear couplings, high speed gear couplings, disc and diaphragm couplings, and shaft couplings.
	www.general-supplies.com /cgi-bin/odp/index.cgi?base=%2F%42%75%73%69%6E%65%73%73%2F%49%6E%64%75%73%74%72%69%61%6C%5F%47%6F%6F%64%73%5F%61%6E%64%5F%53%65%72%76%69%63%65%73%2F%49%6E%64%75%73%74%72%69%61%6C%5F%53%75%70%70%6C%79%2F%50%6F%77%65%72%5F%54%72%61%6E%73%6D%69%73%73%69%6F%6E%2F (3533 words)

	Industrial Power Transmission Components
		US demand to increase 6.1% per year through 2008 US demand for industrial power transmission components (sprockets and chains, clutches and brakes, couplings and universal joints, pulleys and sheaves, etc.) is forecast to advance 6.1 percent to $3.7 billion in 2008.
		Every type of industrial power transmission component will experience a solid rebound in demand following declines during the early 2000s recession.
		In addition, demand for products which can deliver enhanced power transmission in limited space situations or in harsh environments, along with products that improve efficiencies -- such as single unit clutch/brakes and self actuated, hydraulically and pneumatically controlled clutches and brakes -- will spur demand.
	www.mindbranch.com /listing/product/R154-1182.html (196 words)

	Carlisle Companies Sells European Power Transmission to Megadyne
		The business had been part of the Dayco Power Transmission business acquired by Carlisle in August 2001.
		Rick McKinnish, Carlisle's President and CEO commented, "The divestiture of this breakeven business is consistent with our strategy of focusing on businesses that have or can achieve competitive advantage in addition to a leadership position in their markets.
		Carlisle is a diversified global manufacturing company serving the transportation, construction, commercial roofing, automotive, pharmaceutical, foodservice, data transmission, and specialty tire and wheel industries.
	www.theautochannel.com /news/2003/01/09/152586.html (321 words)

	Transmission and Power Steering Fluid Exchanger
		Sun Xtreme Transmission and Power Steering Fluid Exchanger is portable and fully interactive.
		To make power steering or transmission fluid changes easier, this unit is powered by the vehicle's 12-volt battery.
		Four capacity selections (4, 12, 16 and 20 qt.) allow for specified amounts of automatic transmission fluid to be pumped into the transmission, for more cost-effective servicing.
	buy1.snapon.com /products/diagnostics/transmission-fluid-exchanger.asp?partno=EETF103A&dir=catalog (576 words)

	TVA Kids: Power Transmission
		The second half of the story is the transmission and distribution of power—actually moving the electricity to homes, schools, farms, and businesses.
		Electricity is produced at a TVA generating plant and carried over high-voltage transmission lines to delivery points of local companies that distribute the power.
		Tall metal transmission towers keep the power lines that carry electricity far off the ground, and “electricity-proof” insulators made of glass or porcelain keep the electric current from leaving the power lines and entering the metal towers.
	www.tvakids.com /electricity/transmission.htm (373 words)

	Power transmission distributor expands ito Eire: News from Challenge Power Transmissions
		Challenge Power Transmission, the Wolverhampton based Power Transmission distributor has purchased a 60% share of Abec Bearings of Dublin, now Abec Challenge Power Transmission Ireland
		Challenge Power Transmission, the Wolverhampton based Power Transmission distributor has purchased a 60% share of Abec Bearings of Dublin, Eire.
		The company has changed the trading name to Abec Challenge Power Transmission Ireland, with a view to dropping the Abec part in the future.
	www.engineeringtalk.com /news/chb/chb104.html (175 words)

	Safety and Health Topics: Construction - Power Transmission and Distribution
		Employees working on and around power transmission and distribution systems face great dangers from electrocution, falls, and other serious hazards.
		These workers are not covered by the 1994 OSHA electric power generation standard, this applies only to the general industry.
		The following questions link to information relevant to power transmission and distribution in the construction industry.
	www.osha.gov /SLTC/powertransmission/index.html (159 words)

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