The most popular elementary and middle school elec

2022-07-30
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Abstract: with the continuous improvement of people's living standards in China, more and more attention is paid to education, and with the gradual inclination of finance to education, there are many middle school campuses with extensive functions and complete facilities, of which the typical ones are mainly teaching buildings, and equipped with perfect supporting facilities such as experimental buildings, office buildings, dormitories, canteens, bathrooms and stadiums. This paper focuses on the teaching building, and expounds the electrical requirements of middle schools from the aspects of lighting, energy saving and safety

key words: school electrical design, lighting, energy conservation and safety with the continuous improvement of people's living standards in China, more and more attention has been paid to education, and with the gradual inclination of finance to education, there have been many middle school campuses with extensive functions and complete facilities, of which the typical ones are mainly teaching buildings, equipped with complete supporting facilities such as experimental buildings, office buildings, dormitory buildings, canteens, bathrooms, stadiums, etc. This paper focuses on the teaching building, and expounds the electrical requirements of middle schools from the aspects of lighting, energy saving and safety. Part I strong current part I power supply for the campus 1. The load grade shall be in accordance with the current relevant specifications. The lighting power for multi-storey teaching buildings shall be supplied by class III load. The load grade of fire-fighting facilities, security system, information network system and key laboratories serving the campus shall not be lower than class II power supply. The fire-fighting equipment shall adopt double circuit power supply and be equipped with terminal automatic mutual switching device. 2. Power distribution mode (1). Independent power transformation and distribution facilities shall be set in the campus. The substation should be set close to the power load center, and the substation should be set in the special management room, and the reasonable location of the substation should be considered from the aspects of safety, noise, etc. (2) If the space between buildings is large, the distribution is scattered, and the power consumption scale of each building is small, the general distribution room can be set according to the functional zoning, that is, according to the distinction of teaching, office, experiment, supporting facilities, etc., and the trunk or radial power supply can be implemented. The main box is set on the first floor of the single building, and the distribution box is set on the other floors. For single buildings with large power consumption, such as comprehensive experimental building, computer information building, etc., it is advisable to set up a general distribution room on the ground floor of the building, a general distribution box on the floor, and a distribution box in each classroom. The specific power distribution structure diagram is as follows: Note: A. there is only one example of contraction mode after power distribution cooling; b. Difference between distribution cabinet and distribution box: difference 1: cabinet or box shall be adopted according to the configuration of electrical components in the frame; Difference 2: according to Wuxi low voltage electrical equipment regulations, generally, the cabinet is used below 100kW, otherwise, the cabinet is used. 3. Capacitance compensation. The campus distribution reactive power compensation shall adopt the local balance method, which can adopt the combination of decentralized compensation and centralized compensation. The decentralized compensation shall set automatic switching capacitor banks in each distribution room; The automatic switching capacitor bank is set at the low-voltage side of the transformer for centralized compensation. The specific compensation method shall be comprehensively considered according to economy, facts and reliability. In addition, according to the requirements of the standard for lighting design of buildings, the power factor of the illuminator shall not be less than 0.90, which requires that gas discharge lamps, fluorescent lamps and other illuminators must use high-power factor ballasts; For low power factor type illuminators, single lamp local capacitance compensation or sub loop local capacitance compensation can be adopted, and the power factor after compensation shall not be less than 0.90. Calculation method of capacitance compensation: A. determine the power factor before compensation. Determine the loop power and calculation current according to the power and power factor of a single electric facility, and determine the power and calculation current of the whole building by analogy, so as to determine the comprehensive power factor of the whole building; b. Determine the power factor after compensation. According to the electric power law of the people's Republic of China, regulations on the supply and use of electric power and other regulations, the maximum advantage factor of electric power in primary and secondary schools should not be less than 0.90. c. Through the power factors before and after compensation, determine the capacitance compensation size according to the calculation or the quick look-up table of capacitance compensation. 2、 Classroom lighting and socket configuration 1. Illuminance and greatly reduce the system control circuit and density value A. illuminance of various rooms room or place reference plane and high illuminance standard (LX) UGR RA classroom class desktop 3001980 laboratory experiment desktop 3001980 art classroom desktop 5001990 multimedia classroom 0.75 horizontal plane 3001980 classroom blackboard blackboard 500-80 B Lighting power density value room or place lighting power density value corresponding to illuminance value (LX) current value target value classroom, reading room 119300 laboratory 119300 art classroom 1815500

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