The general guidance is that there are four protections: one is current protection, the other is distance protection, the third is differential protection, and the fourth is non-electric quantity protection.
The current protection has three-stage, zero-sequence current and zero-sequence power directions
The distance protection has shifted impedance and directional impedance
The differential is mainly a longitudinal difference
No. -electrical quantities have gas protection and gap protection
< p>I don't remember them clearly, but they are basically the same. I will read some books when I have time< strong>Permanent land acquisition is generally based on the machine position of 25*25 meters. If there is a box type transformer, add that as well. The land occupied by the booster stationis also the subject of permanent land acquisition.
Attempts to use wind energy to produce electricity began at the beginning of the 20th century. In the 1930s, Denmark, Sweden, the Soviet Union and the United States applied rotor technology from the aviation industry and successfully developed some small wind power devices.
This type of small wind turbine is widely used in windy islands and remote villages. The cost of generating electricity is much lower than that of a small internal combustion engine. However, electricity generation capacity at that time was relatively low, generally less than 5 kilowatts.
Detailed information:
Development of China:
2006 In 2007, China had a total of 6,469 wind turbines, of which MW units accounted for 21.2%. In 2007, this proportion jumped to 38.1%, an increase of 16.9 percentage points. In 2007, the cumulative installed capacity of global wind power reached 94,100 MW, an increase of 27% from 74,200 MW the previous year.
In 2007, China's installed wind capacity was 6.05 million kilowatts, reaching the target set for 2010 three years ahead of schedule; in the six years from 2001 to 2007, the installed capacity of wind power in China increased 14 times; In 2007 alone, China's installed wind power capacity increased by 3.449 million kilowatts, more than the cumulative total of China's wind power in history. With the rapid development of the wind power industry, the supply of wind power equipment exceeds demand.
Baidu-Wind Encyclopedia