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The production and transportation process of electric power

The production and transportation process of electric power

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The equipment of the two system comprises a measuring device, a control device, a relay protection device, an automatic control device, a DC system and necessary auxiliary equipment. Power system voltage level has 220V, 380V (0.4 kV), 3 kV, 6 kV, 10 kV, 20 kV, 35 kV, 66 kV, 110 kV, 220 kV, 330 kV, 500 kV, 750kV, 1000kV. With the improvement of motor manufacturing process, 10 kV motor has been mass production, so the use of kV, 6 kV has been less than 20 kV, 66 kV is also rarely used. The power supply system is 10 kV and 35 kV. Transmission and distribution system to 110 kV or above. Power plant generator has 6 kV, 10 kV and, with a total of 20 kV, users are 220V, 380V (0.4 kV) low voltage system 20kV.
The transmission voltage is the main symbol of the development level of transmission technology. By 1990s, the world's commonly used transmission voltage of 220 thousand volts and above high voltage transmission of 330 to 765 thousand volts EHV transmission, more than 1 million volts and UHV transmission. In power system, the power plant will naturally change the primary energy into electricity, and send electricity to power users far away, in order to reduce the power loss of transmission line and line impedance, voltage should be increased; in order to meet the needs of power users safe, and will reduce the voltage, and assigned to each user, this we need to raise and lower the voltage, and can change the distribution of electric power. So the substation and distribution of electric power electrical device through its transform voltage, electric power system, it is a link between power plant and power users, and through each substation voltage level of the grid connected substation function is to transform voltage, transmission and distribution of power. Substation is composed of power transformer, power distribution equipment, two system and necessary auxiliary equipment.
Transmission lines can be divided into overhead transmission lines and underground transmission lines according to the structure. The former is composed of line tower, conductor, insulator and so on, which is erected on the ground; the latter is mainly used for laying underground cable (or underwater). According to the nature of the current, the transmission can be divided into DC and AC transmission. In 1880s, the first successful realization of DC transmission, due to the low voltage limit (the transmission capacity is roughly proportional to the square of the transmission voltage) in the end of nineteenth Century for AC transmission replaced. AC transmission success ushered in the era of electrification in twentieth Century. Since 1960s, because of the development of power electronics technology, DC transmission has a new development, and AC transmission, with the formation of AC and DC hybrid power system.
The transmission of electric energy, which is connected with the transformer, distribution and electricity, constitutes the whole function of the power system. Through the transmission, the far apart (up to several thousand meters) linked to the power plant and the load center, the development of electricity and use beyond the geographical restrictions. Transmission and other energy sources (such as coal, oil etc.) compared to transmission loss, high efficiency, flexible and convenient, easy to control, less environmental pollution; transmission can also connect the power plant in different locations, implementing peak and valley regulation. Transmission is an important embodiment of the superiority of the use of electric energy. In modern society, it is an important energy source.

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