China's existing power grids are mainly based on 500 kV EHV lines, which not only have a small power transmission capacity, but also can not realize long-distance transmission. Power grid experts pointed out that building an ultra-high voltage power grid capable of large-capacity, long-distance, low-loss power transmission has become the top priority for the construction of China’s power grid during the “12th Five-Year Plan†period, and it is the best choice.
According to the State Grid of China, during the “Twelfth Five-Year Plan†period, “three vertical and three horizontal†UHV backbone grids and 16 DC transmission projects linking large-scale energy bases and major load centers will be constructed to form a large-scale “West-to-East Electricity Transmissionâ€. The energy distribution pattern of “Northern Power Transmission to the South†basically builds a strong smart grid that uses the UHV power grid as the backbone grid and the coordinated development of the power grids at all levels, so that the operating efficiency, safety level, technological level, and intelligence level of China’s power grid are achieved. overall enhancement.
The reporter learned today from the State Grid that at present, China's coal resources are distributed in the north and northwest, with a total of 76%; 80% of the hydropower resources are distributed in the southwest; most of the land's wind and solar energy resources are distributed in the northwest. At the same time, more than 70% of energy demand is concentrated in the eastern and central regions. The distance between the energy base and the load center is between 1000 and 3000 kilometers. Therefore, building power in the western and northern regions where energy resources are abundant, and then sending power to the load center is the best choice. However, China’s existing power grids are mainly based on 500-kV EHV lines, which not only have low power transmission capacity, but also cannot realize long-distance transmission.
Here grid experts pointed out that the construction of ultra-high voltage power grids with large-capacity long-distance and low-loss power transmission has become the top priority for the construction of China's power grid during the “12th Five-Year Plan†period, and it is the best choice.
According to reports, at present, China has built two UHV projects: one is the 1000-kilovolt Jindongnan-Nanyang-Jingmen UHV AC pilot demonstration project, and the other is ± 800 kV Xiangjiaba-Shanghai UHV DC transmission project. In addition, the main projects under construction include: Suidong Electric Transmission to Huainan-Zhebei-Shanghai UHV AC project, which was approved by the National Development and Reform Commission in September this year. Construction has started and it is scheduled to be put into operation in 2013; Jinping-Suinan ± 800 kv The HVDC project was approved in November 2008 and has a transmission capacity of 7.2 million kilowatts. It is planned to be completed and put into operation in 2012. In addition, the Ximeng-Nanjing UHV AC project, Xiluodu-Zhexi, Hami-Zhengzhou, and Ningdong-Zhejiang UHV DC projects have obtained the approval of the National Energy Administration for the preparatory work.
According to the State Grid of China, during the “Twelfth Five-Year Plan†period, “three vertical and three horizontal†UHV backbone grids and 16 DC transmission projects linking large-scale energy bases and major load centers will be constructed to form a large-scale “West-to-East Electricity Transmissionâ€. The energy distribution pattern of “Northern Power Transmission to the South†basically builds a strong smart grid that uses the UHV power grid as the backbone grid and the coordinated development of the power grids at all levels, so that the operating efficiency, safety level, technological level, and intelligence level of China’s power grid are achieved. overall enhancement.
The reporter learned today from the State Grid that at present, China's coal resources are distributed in the north and northwest, with a total of 76%; 80% of the hydropower resources are distributed in the southwest; most of the land's wind and solar energy resources are distributed in the northwest. At the same time, more than 70% of energy demand is concentrated in the eastern and central regions. The distance between the energy base and the load center is between 1000 and 3000 kilometers. Therefore, building power in the western and northern regions where energy resources are abundant, and then sending power to the load center is the best choice. However, China’s existing power grids are mainly based on 500-kV EHV lines, which not only have low power transmission capacity, but also cannot realize long-distance transmission.
Here grid experts pointed out that the construction of ultra-high voltage power grids with large-capacity long-distance and low-loss power transmission has become the top priority for the construction of China's power grid during the “12th Five-Year Plan†period, and it is the best choice.
According to reports, at present, China has built two UHV projects: one is the 1000-kilovolt Jindongnan-Nanyang-Jingmen UHV AC pilot demonstration project, and the other is ± 800 kV Xiangjiaba-Shanghai UHV DC transmission project. In addition, the main projects under construction include: Suidong Electric Transmission to Huainan-Zhebei-Shanghai UHV AC project, which was approved by the National Development and Reform Commission in September this year. Construction has started and it is scheduled to be put into operation in 2013; Jinping-Suinan ± 800 kv The HVDC project was approved in November 2008 and has a transmission capacity of 7.2 million kilowatts. It is planned to be completed and put into operation in 2012. In addition, the Ximeng-Nanjing UHV AC project, Xiluodu-Zhexi, Hami-Zhengzhou, and Ningdong-Zhejiang UHV DC projects have obtained the approval of the National Energy Administration for the preparatory work.
Silicon TVS / TSS:
Diode TVS (Transient Voltage Suppressor), also known as Transient suppression diodes, is widely used a new type of high efficient circuit protection device, it has a fast response time (the nanosecond) and high surge absorbing ability.When it ends of stand moments of high energy shock, TVS can bring the two ends at high rate from high impedance to a low impedance between impedance values, to absorb a large current moment, put it at both ends of the voltage restraint on a predetermined value, thus protecting the back of the circuit components are not affected by the impact of the transient high pressure spikes.
Silicon TVS Transient Voltage Suppresso,Silicon TSS Transient Voltage Suppresso
YANGZHOU POSITIONING TECH CO., LTD. , https://www.cnpositioning.com