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High Voltage
Shcri.com: China will Invest 87.6 billion USD in the Construction of Ultra-high Voltage Transmission
www.shcri.com - During the 2009 International Ultra-high Voltage Transmission Technology Conference held on 21st May, the person of State Grid Corporation of China revealed that the State Grid will invest in 600 billion Yuan (87.6 billion USD) in the construction of ultra-high voltage transmission before 2020.
The State Grid will invest in 600 billion Yuan (87.6 billion USD) in the construction of ultra-high voltage transmission before 2020, which far exceed the original planed investment amounts. The original plan is that the ultra-high voltage girds will be basically completed by 2020 and the transmission quantities of the electricity will reach over 200 million kilowatts, accounting for 25% of the total installation capacity all over the country. The largest gird corporations will totally invest 406 billion Yuan (59.3 billion USD) in the ultra-high voltage grids, including 256 billion Yuan for the alternating current and 150 billion Yuan for the direct currency.
The southeastern Shanxi-Nanyang-Jingmen projects, the first ultra-high voltage alternating currency experiment demonstration project in China with more than two years of construction, would be officially completed and in operation on 6th January, 2009, indicating China has succeeded in mastering the core technologies of ultra-high voltage transmission in long distance, large installation capacity and low losses. The three largest ultra-high voltage alternating currency transmission and transformation project from Huainan to Shanghai, Xinlinguole to Shanghai and northern Shaanxi to Changsha will be started to construct this year. Apart from these three projects, the State Grid will also speed up the constructions of the ultra-high voltage direct currency projects from Xiangjiaba to Shanghai and Jinping to southern Jiangsu. The general localization rate of the southeastern Shanxi-Nanyang-Jingmen projects has reached over 90% and the basic equipments are all from domestic equipment manufacturers except of a small part of components. Therefore, the over investments of the State Grid on the ultra-high voltage transmission will bring larger development opportunities for Chinese domestic ultra-high voltage equipment manufacturers. The ultra-high voltage technologies mainly center on several giant enterprises and the ultra-high voltage equipment field has become oligopolistic competition pattern, the major products covering transformers, converter valves, switches, control and protection equipments and other complete equipments and major involved listed companies including TBEA Co., Ltd, Baoding Tianwei Baibian Electric Co., Ltd, XJ Electric Co., Ltd, Henan Pinggao Electric Co., Ltd and Nari Technology Development Limited Company etc.
Source: China Research and Intelligence
Get more information, please visit http://shcri.com/reportdetail.asp?id=287
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Eileen Gu
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Email:eileen@shcri.com
About the Author
Based on the database, Interviews and research methods from China Research and Intelligence, CRI analyzes the development and opportunities in this industry clearly.
How can power be transmitted at high voltage and low current in a power line?
according to ohm's law, high voltage produces high current. So i'm confused.
Yes, it is confusing; because you have Ohm's law:
I = V/R
But you've also got this equation for power:
P = VI
So when you say that "high voltage produces high current," that's only true in cases where the power is allowed to vary. For example, if you double the voltage on a simple battery-powered circuit by adding an extra battery in series, then you are indeed doubling the current too. You are also quadrupling the power.
However, in some cases, the amount of power is constrained by other factors, and can't be made to go above some limit. (For example, if the electricity is being generated by magnets attached to a steam turbine, the power in the electrical circuit can't exceed the power of the steam.) In cases where "P" is constant, you can't raise "V" without simultaneously decreasing "I".
In a DC current, the voltage changes by going across a resistor; and the power output depends on the resistance and the voltage; and the current is proportional to the voltage drop.
But in an AC current, you can change the voltage by means of a transformer. In that case, the voltage change is not due to resistance, but due to magnetic induction; therefore Ohm's law doesn't apply within the transformer. Generally the power is held constant, which means if your transformer reduces the voltage, it will _increase_ the current, according to P = VI. And likewise if the transformer increases the voltage, it will reduce the current.
To see how that applies to power transmission, let:
Ps = power generated at source;
Pc = power usable by consumers;
Pt = power lost in transmission lines.
Then (roughly):
Pc = Ps - Pt
So obviously, you want to maximize Pc, the power to the consumers, and minimize the loss Pt in the power lines.
From Ohm's law and from P=VI, you can see that P=I²R, so
Pt = I²R
where R is the resistance in the transmission wires. This means you would like to reduce the current in the transmisison wires as much as possible, while holding Ps constant. This is done by means of transformers, which step the voltage way up (and the current way down) before the power is sent across the wires; thus reducing the power loss.
Electric Six - "Danger! High Voltage" (Hi Res)