High Voltage Power

Development of UHV power system including transmission "highway" - special high voltage, power, power transmission - Electric indust

Learned from the State Grid Corporation, the government-led, business promotion, special high voltage power grid construction in China has taken a firm step, through scientific decision-making, research in technology, equipment manufacturing and other aspects of a major breakthrough, Jindongnan? Nanyang? Jingmen UHV AC pilot demonstration projects have been completed the approval process, China's first commercial operation of the special high-voltage transmission line will be started soon.

UHV 1000 kV AC power grid is, positive and negative DC voltage of 800 kV and above transmission network. Construction of UHV grid will greatly enhance the long-distance, large capacity transmission efficiency, reduce transmission losses, lower transmission costs, large coal bases, fire power base, a large nuclear power base construction, a wider range of resources to achieve optimal allocation, promoting China energy efficient development and use, and promote the sustainable development of economic and social.

According to the NDRC and long term plan to develop the power industry from now to 2020, 15 years, our country needs new installed capacity of more than 500 million kilowatts, an average more than 33 million kilowatts. Countries in the world practice shows that, with the rapid growth of electricity demand, the development of higher voltage transmission technology, not only can achieve long-distance, high-capacity transmission, but also to optimize energy resources, reduce the impact on the environment is important. Experts pointed out that the development of UHV power savings can be achieved in four areas:

First save investment, power development from around the world experience, high-level voltage transmission performance than low-level voltage transmission obvious economy. The results show that 1000 kV AC transmission program unit cost of transmission capacity is approximately 500 kV transmission comprehensive program of 73%, ± 800 kV HVDC transmission capacity of an integrated program unit cost of about ± 500 kV DC transmission program 72 %.

Second, conservation of land resources, and 1000 kV and 500 kV line corridor width of the known, a back voltage of 1000 kV transmission line corridor width of about 5 500 kV line corridor width back to 40%, that is, that the same transmission power (such as 5 million kilowatts), with 1000 kV transmission lines of 500 kV line with the savings compared to 60% of land resources. Therefore, UHV transmission line corridor to save the land use, reduce land acquisition, to reduce damage to vegetation and soil erosion, is an expression of environmental protection and resource conservation projects.

Third, saving running costs, transmission line loss, the total wire cross section, transmission capacity are the same circumstances, the 1000 kV transmission lines of 500 kV transmission line current half. As the line resistance and line loss is proportional to the square of current, the wire cross section and homogeneous transmission capacity at the same time, theoretically 1000 kV line resistance per unit length of 500 kV line loss is 25%.

4 is to reduce the impact of environmental pollution coal, using special high-voltage transmission, clean electricity directly transported to the east, north and Guangdong, the load center of densely populated, less densely populated areas can be sources of pollution, reduce the population centers environmental capacity of the saturation pressure, also can reduce long-distance rail and road transport emissions coal power generation on the atmospheric environment pollution.
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Grid Tie Inverter

If you’re generating excess power with your solar panels or wind turbines, a grid tie inverter will let you sell this electricity to the utility company.

The 1978 Federal Public Utilities Regulatory Policies Act (PURPA) dictates that everyone in the US has the right to sell renewable energy to their local power company. This law came about after the 1973 Arab oil embargo and is equally welcome today.

If you have solar panels or wind turbines, chances are you already have a standard inverter, which works to convert DC electricity to AC. They also function to convert 12 or 24 volt electricity to 120 volt, for the same reason. Many users of renewable energy systems are missing out on the benefits of another, special type of inverter, though. At 120 volts and 60 cycles per second, the AC electricity you get from a power inverter is pretty much the same as that which comes right from the grid. However, this doesn’t necessarily mean that both sorts of electricity are cycling in phase with each other. If your inverter’s electricity is cycling up when the grid’s is cycling down, sending your electricity there won’t work. A grid tie inverter will ensure that your inverter stays in sync with the grid.

A grid tie inverter is useful in other ways as well. In a sense, electricity always goes downhill: it flows from higher voltage to lower voltage. This is what allows you to charge a battery. The electricity flows from the charger, which outputs at high voltage, to the battery, at lower voltage. This also shows why it takes more than 12 volts to charge a 12 volt battery.

For the same reason, you have to have electricity of a slightly higher voltage than that of the grid in order to move your electricity there. A grid tie inverter will make this possible. Any electricity you aren’t using will flow out to the grid, and your power meter will actually run backwards.

The special functions of a grid tie inverter make it more expensive than a regular inverter. However, the investment is justified by the profits that can be gained with the use of a grid tie inverter. Anyone using wind or solar energy should really consider investing in a grid tie inverter.

The idea of off grid living appeals to many people. If you are interested, take a look at Off Grid Living.

To learn more about how the solar power system works, you can check out Solar How To.

If you want to build your own DIY solar charger instead of using a plug-in charge, read DIY Solar Charger.

Why can't we transmit high voltage power using RF waveforms instead of using powerlines?

The intensity decreases as the distance increases. The factor is one over radius squared. At twice the distance one only receives 1/4 the power.
see http://en.wikipedia.org/wiki/Inverse-square_law#Electromagnetic_radiation

There are other issues too. As the intensity of the radiated power increases it tends to heat up any objects that get in the way.

http://en.wikipedia.org/wiki/Microwave_power_transmission#Common_safety_concerns

Springfield Township loses power line case (business)

PPL can build 7-mile high voltage line

Springfield Township has lost its fight with PPL Corp. over the electric
utility's plans to build a high voltage power line.

business

High Voltage Cable Inspection