Characteristics of Electrical Design of Wujing Phase 8 2X600MW Units

Abstract: The information on the electrical design characteristics of the Wujing Phase 8 2X600MW unit is provided by the excellent flowmeter and flowmeter production and quotation manufacturers. 1 Overview Wujing Phase 8 is a 2X600MW domestic and imported coal-fired unit project, and there are conditions for further expansion of two units. The three main machines are domestic equipment produced by the introduction of foreign technology. The boiler is a 2088t/h furnace of Shanghai Boiler Factory; the generator is Shanghai Electric Machinery Factory. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following is the details of the electrical design features of Wujing Phase 8 2X600MW units. 1 Overview Wujing Phase 8 is a 2X600MW domestic imported coal-fired unit project, and there are conditions for further expansion of two units. The three main machines are domestic equipment produced by the introduction of foreign technology. The boiler is a 2088t/h furnace of Shanghai Boiler Factory; the generator is a product of Shanghai Electric Machinery Factory. The steam turbine is a subcritical condensing steam turbine with a rated power of 600MW and a maximum power of 674MW, manufactured by Shanghai Steam Turbine Plant. The boiler room is arranged in the open air; the steam turbine generator set is arranged vertically; the main powerhouse adopts the steel structure. The cooling water circulation mode of the whole plant is the secondary circulation mode with cooling tower. 2 Electrical main wiring 2. 1220kV system 2.1. 1220kV wiring Two 600,000-kilowatt units in this phase are boosted to 220kV by the main transformer and connected to the system. The 220kV wiring is a double bus with bypass, and a dedicated bypass circuit breaker is provided. There are four 220kV incoming lines in this phase, of which two are incoming lines for #1 and #2 generators and a main transformer, and the other two are incoming lines for high-voltage utility/standby transformers. There are a total of four qualifying rounds in this period, and another two qualifying rounds are reserved. Considering the possibility of expansion in the future, the section of the 220kV positive and auxiliary busbars has been reserved in this period. 2.1.2 Selection of power distribution devices The power plant site is located in a polluted area, which is very easy to contaminate the outer insulator of the electrical equipment. It is easy to form a dielectric conductive film on the surface of the insulator under foggy or drizzle weather conditions, thereby causing flashover. network. According to the Pollution Grading Standard for External Insulation of High-Voltage Overhead Lines and Electric Porcelain Substations issued by the Ministry of Water and Electricity, the anti-pollution level of the power plant site should be Class II (pollution level), and the leakage ratio of the external insulation of the electrical equipment of the power plant should not be less than 25mm/kV. The power plant site is tense, and the air pollution is more serious. Therefore, the layout of the booster station should not only occupy less space, but also operate safely. Fully enclosed combined electrical appliances (GIS) occupy less area and have high safety. It is one of the solutions to solve salt pollution and reduce the floor area. However, due to the excessive investment, it has been greatly restricted in practical use. According to system requirements, 220KV equipment with a breaking current of 50kA and a rated current of 2500A and above should be selected. With comprehensive investment in conventional equipment and civil works, the interval for each circuit breaker is about 3 million yuan, while for foreign GIS equipment, the interval for each circuit breaker is about more than 8 million yuan. Obviously, the investment in GIS equipment is about 3 million yuan for conventional equipment. 2.53 times or so. After initial approval, the indoor power distribution device using conventional electrical equipment. 2.1. 3220kV main equipment selection principle Considering the importance of the power plant in the system, the circuit breaker, current transformer, isolating switch, capacitive wall bushing in the 220kV equipment are imported equipment, and the rest are voltage transformers, zinc oxide Arrester and other use of domestic equipment. 2.1.4 Layout of power distribution device The 220kV power distribution device in this project is a two-story double-column structure in the house, with a total of 10 double bays. The width of each double bay is 12m, the longitudinal length is 42m, the height of the second floor floor is 11.50m, and there is a stairwell with a width of 3m at both ends and the middle of the power distribution device. 1) The positive, auxiliary and bypass busbars of the power distribution device of the busbar system are all LV—21Y—150/136 aluminum-manganese alloy tubular busbar, the current carrying capacity can reach more than 3000A, the V-shaped insulator string is vertically suspended, the busbar phase distance is 2800mm, and the busbar span is 12m. This suspension method is a soft connection structure with elastic absorption characteristics. Under the action of short-circuit electromotive force, the busbar will have a certain degree of sway. In order to reduce the sway during short-circuit, a certain amount of external load (iron block) is added to the tubular busbar. After calculation, when the short-circuit current is 50kA, the horizontal and vertical displacements generated during short-circuit are within 250mm, considering the most unfavorable At this time, the net distance between phases is also more than 2200mm, which can fully meet the requirements of safe live distance. It is this soft connection structure, which not only avoids the problems of large interphase distance, high busbar height, and complex structure when using soft busbars, and reduces construction costs; damage, and the cost of the V-shaped string is only equivalent to 1/4 of the pillar porcelain bottle—1/3. According to the actual operation of the power system for many years, the layout of the busbar is very desirable in terms of cost and safe operation. 2) The layout of the equipment The interval width of the power distribution device is 12m, and the phase-to-phase distance of the equipment is 3m.

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