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1、1Analysis of Building Electrical EnergyPaper Keywords: electrical energy supply and distribution system power factor harmonic energy-saving lighting energy management control Abstract: The article on electrical energy efficiency design principles to be followed, from the supply and distribution syst
2、em design, rational use of electric motors, power factor correction, harmonic control, lighting, energy efficiency, renewable energy, energy management systems, etc., discussed the building electrical rational use of energy. With Chinas sustained and rapid economic growth as a secondary energy power
3、 supply and demand have become increasingly prominent in actively promoting energy conservation, low carbon economy, how the electrical energy-saving measures throughout the design process is especially important below actual work on the electrical design of the building to talk about some of the vi
4、ews of several energy-saving measures. An electrical energy-saving design principles to be followed Electrical energy is an important part of 2building energy efficiency, electrical designers in the design process, from the applicability, safety, reliability and economy aspects into account, through
5、 the rational design and operation of programs to reduce the unnecessary energy loss. 2 electrical energy-saving design includes the following aspects 2.1 distribution system for the rational design According to users the importance of the nature of the load, electricity capacity, project characteri
6、stics, system size, and the design supply and distribution system, the system is in the best condition to run. 2.1.1 According to the distribution of electricity load capacity and make changes, substation near the load center, to shorten the radius of low-voltage power supply, reduce line losses, re
7、duce voltage loss, quality of supply to meet the requirements for the distribution line length should not exceed 250m. 2.1.2 The supply and distribution system should 3be simple and reliable power distribution series should not be too much, the same user, the series should not be more than two high
8、voltage power distribution, transformer secondary side to the low-voltage electrical equipment distribution between series should not be more than three, to minimize power loss by two line-powered systems, should adopt the two-way power mode while running in order to reduce line loss during normal o
9、peration. 2.1.3 a reasonable choice of power supply voltage under the same circumstances, the higher the voltage, the smaller the loss. Supply voltage levels should be determined by considering technical and economic rationality and the relevant provisions of the power company and other factors when
10、 the total capacity of 250kW electrical equipment and above or in the 160kVA transformer capacity and above, it is desirable to 10 (6) kV power supply. for large public buildings, air-conditioning chillers, energy-saving factors into account, the program more as far as possible 10 (6) kV chillers, b
11、ut should be considered large capacity of the transformer 4when the motor starts the impact. 2.1.4 a reasonable choice of the transformer. 10 type power transformers and above should be used, amorphous alloys energy saving, low loss and low-noise transformers. Long-term work load transformer ratio s
12、hould not be greater than 0.85, the choice of transformer capacity and the number of Taiwan, should be flexible and change according to the load, considering the investment and annual operating costs, a reasonable distribution of the load, select the load capacity and the power transformer to adapt
13、in order to achieve its economic performance, reduce the light load operation unnecessary power loss. In addition, ambient temperature to reduce the transformer, balanced three-phase load, a reasonable choice of transformer wiring, seasonal load changes caused by the flexibility of switching transfo
14、rmer is also an effective way to reduce energy consumption. 2.1.5 to reduce the line energy loss in carrying capacity to meet the permit, the voltage loss, heat-stable 5short-circuit current technical indicators such as the premise, the current density should be a reasonable economic parity, select
15、the wire cross-section, so as to achieve lower power consumption, reducing investment and savings The purpose of non-ferrous metals. 2.2 reduce the motor power consumption, improve motor efficiency 2.2.1 a reasonable choice based on load characteristics of high efficiency motors, the motor is runnin
16、g to improve the efficiency and power factor. 2.2.2 large motor power inverter can be used (except for fire-fighting equipment), can improve the motor efficiency at light loads, to save energy. 2.2.3 soft starter, the motor starts smoothly, ensure voltage fluctuations within the requirements. 2.3 reasonable increase in power supply system power factor Design should be the right choice by electric motors, transformers and lighting starter capacity, reduce the li
