浅谈高层建筑供配电系统设计 毕业论文外文翻译.doc

外文资料翻译 power supply system of high-rise building design abstract: with the continuous development of city size, more and more high-rise buildings, therefore high-rise building electrical design to the designers had to face. in this paper, an engineering example, describes the electrical design of high-rise buildings and some of the more typical issues of universal significance, combined with the actual practice of an engineering solution to the problem described. key words: high-rise building; electrical design; distribution; load calculation 1 project overview the commercial complex project,with a total construction area of 405570m2,on the ground floor area of 272330m2, underground construction area of 133240m2, the main height of 99m. project components are: two office buildings, construction area is 70800m2, 28 layers, the standard story is 3.2m. 2 load calculation 1) load characteristics: electric load, much larger than the national civil engineering technical measures large 120w/m2 indicators, especially in the electricity load more food, and different types of food and beverage catering different cultural backgrounds also high. 2) the uncertainty of a large load, because the commercial real estate rents are often based on market demand, and constantly adjust the nature of the shops, making the load in the dynamic changes. 3) there is no specification and technical measures in the different types of commercial projects refer to the detailed parameters of the shops, engineering design load calculation in the lack of data, in most cases to rely on staff with previous experience in engineering design calculations. load the selection of parameters: for the above problems, the load calculation, the first developer of sales and good communication, to determine the form of layers of the forms and nature of floor area, which is calculated on the basis of electrical load basis; followed to determine parameter index within the unit area of shops is also very important and complex because there is no clear indicator of the specification can refer to; and different levels of economic development between cities is not balanced, power indices are also different; will be in the same city, different regions have different consumer groups . 3) the need to factor in the choice: parameters determined, the need for load calculation. need to factor commonly used method, the calculation will not repeat them. need to explore is the need for coefficient selection, which in the current specifications, manuals and the unified technical measures is also not clear requirements, based on years of design experience that most end shops in the distribution or level within the household distribution box with case kx generally take a while, in the calculation of the loop route to take 0.7 to 0.8, the distribution transformers in the substation calculations take 0.4 to 0.6. 3 substations set load calculation based on the results of this project the total installed capacity of transformer 43400kv.a, after repeated consultations with the power company, respectively, in the project in northern, central and southern three sections set the three buildings into three power substations, 1 # set 6 sets 2500kv.a transformer substation, take the northern section of power supply; 2 # 4 1600kv.a transformer substations located, plus 6 sets 2000kv.a transformers, take the middle of the power supply, in addition to 5 taiwan 10kv.a high-pressure water chillers (total 4000kv.a); 3 # substation located 2 units plus 2 units 1000kv.a 2000kv.a transformers, take the southern section of a, b two office supply. 10kv power configuration of this project into two points, each at the two 10kv lines, the power company under the provisions of 10kv power capacity: maximum load per channel is about to 11000kv.a, two is the 22000kv.a, design # 1 , 3 # combination of a substation 10kv, power line, with a total capacity of 21000kv.a; 2 # substation transformers and 10kv, 10kv chillers sharing a power line, with a total capacity of 22400kv.a. the design of the substation layout, in addition to meeting regulatory requirements, it also need to consider the high-pressure cabinets, transformers and low voltage power supply cabinet by order of arrangement, especially in low voltage distribution cabinet to feed the cable smooth and easy inspection duty problems are not seriously consider the construction of the cable crossing will cause more long detour, a waste of floor space, and convenient inspections and other issues【8】. 4 small fire load power supply in the design of large commercial projects often encounter small fire load of electrical equipment and more dispersed distribution, if fed by a substation, a substation will be fed a lot of low-voltage low-current counter circuit breaking capacity circuit breaker and conductor of the dynamic and thermal stability in a certain extent. according to gb50045-1995 fire protection design of tall buildings, rule should be used in fire equipment dedicated power supply circuit, the power distribution equipment shall be provided with clear signs. interpretation of the provisions of the power supply circuit means from the low-voltage main distribution room (including the distribution of electrical room) to last a distribution box, and the general distribution lines should be strictly separated. in this design, the use of methods to increase the level of distribution, that is different from the substation bus segments, respectively, a fire fed a special circuit, set in place two distribution cabinets, distribution cabinets and then the resulting radial allocated to the end of the dual power to vote each box, so that not only meets the specification requirements for dedicated power supply circuit, but also to avoid feeding the substation level of many small current loop. 5, the choice of circuit breaker and conductor commercial real estate projects use the room as the uncertainty in the choice of circuit breakers and conductors must be considered in a certain margin to meet the needs caused by adjustment of the load changes. according to this characteristic, increased use in the design of the plug bus-powered, not only meet the requirements of large carrying capacity, and also allows the flexibility to increase supply and distribution, are reserved in each shaft in the plug-box backup in order to change, according to changes in upper and lower load, to adjust. for example: a bus is responsible for a shaft 1 to 3 layers of power, when a layer due to the change in capacity increases, while the 3-layer capacity is reduced, you can use a spare plug box layer off the 3-layer 1 layer capacity rationing . this level distribution in the substation, select the circuit breaker to choose the setting value when the circuit breaker to adjust to changes at the end to adjust the load setting value; in the bus and the transformer circuit breaker according to the choice of the general framework of values to select . for example: route certain equipment capacity 530kv, kx take 0.7 to calculate current of 704a, select the frame circuit breaker is 1000a, tuning is 800a; current transformer for the 1000/50; bus carrying capacity for the 1000a, this road can meet the maximum 1000a current load requirements, even if there is adjustment, power distribution switches and circuit can not make big changes. 6 layer distribution box set according to the division of layers of fire protection district, respectively numbered as a k layers within the set level shaft for the retail lighting power distribution box, with one on one power supply shops in radial power. should be noted that the forms of the complex layers of layers of fire partition, does not correspond to the lower, making some of shaft power in charge of the fire district at the same time, also responsible for the power supply adjacent to the fire district. at design time, using the principle of proximity, while also taking into account the burden of the whole trunk load conditions, so that each shaft as far as possible a more balanced load. prerequisitesthe loop that you want to auto-tune must be in automatic mode. the loop output must be controlled by the execution of the pid instruction. auto-tune will fail if the loop is in manual mode.before initiating an auto-tune operation your process must be brought to a stable state which means that the pv has reached setpoint (or for a p type loop, a constant difference between pv and setpoint) and the output is not changing erratically.ideally, the loop output value needs to be near the center of the control range when auto-tuning is started. the auto-tune procedure sets up an oscillation in the process by making small step changes in the loop output. if the loop output is close to either extreme of its control range, the step changes introduced in the auto-tune procedure may cause the output value to attempt to exceed the minimum or the maximum range limit.if this were to happen, it may result in the generation of an auto-tune error condition, and it will certainly result in the determination of less than near optimal suggested values.auto-hysteresis and auto-deviationthe hysteresis parameter specifies the excursion (plus or minus) from setpoint that the pv (process variable) is allowed to make without causing the relay controller to change the output. this value is used to minimize the effect of noise in the pv signal to more accurately determine the natural oscillation frequency of the process.if you select to automatically determine the hysteresis value, the pid auto-tuner will enter a hysteresis determination sequence. this sequence involves sampling the process variable for a period of time and then performing a standard deviation calculation on the sample results.in order to have a statistically meaningful sample, a set of at least 100 samples must be acquired. for a loop with a sample time of 200 msec, acquiring 100 samples takes 20 seconds. for loops with a longer sample time it will take longer. even though 100 samples can be acquired in less than 20 seconds for loops with sample times less than 200 msec, the hysteresis determination sequence always acquires samples for at least 20 seconds.once all the samples have been acquired, the standard deviation for the sample set is calculated. the hysteresis value is defined to be two times the standard deviation. the calculated hysteresis value is written into the actual hysteresis field (ahys) of the loop table.tip while the auto-hysteresis sequence is in progress, the normal pid calculation is not performed. therefore, it is imperative that the process be in a stable state prior to initiating an auto-tune sequence. this will yield a better result for the hysteresis value and it will ensure that the process does not go out of control during the auto-hysteresis determination sequence. the deviation parameter specifies the desired peak-to-peak swing of the pv around the set point. if you select to automatically determine this value, the desired deviation of the pv is computed by multiplying the hysteresis value by 4.5. the output will be driven proportionally to induce this magnitude of oscillation in the process during auto-tuning.auto-tune sequencethe auto-tuning sequence begins after the hysteresis and deviation values have been determined. the tuning process begins when the initial output step is applied to the loop output.this change in output value should cause a corresponding change in the value of the process variable. when the output change drives the pv away from setpoint far enough to exceed the hysteresis boundary a zero-crossing event is detected by the auto-tuner. upon each zero crossing event the auto-tuner drives the output in the opposite direction.the tuner continues to sample the pv and waits for the next zero crossing event. a total of twelve zero-crossings are required to complete the sequence. the magnitude of the observed peak-to-peak pv values (peak error) and the rate at which zero-crossings occur are directly related to the dynamics of the process.early in the auto-tuning process, the output step value is proportionally adjusted once to induce subsequent peak-to-peak swings of the pv to more closely match the desired deviation amount. once the adjustment is made, the new output step amount is written into the actual step size field (astep) of the loop table.the auto-tuning sequence will be terminated with an error, if the time between zero crossings exceeds the zero crossing watchdog interval time. the default value for the zero crossing watchdog interval time is two hours.figure 1 shows the output and process variable behaviors during an auto-tuning sequence on a direct acting loop. the pid tuning control panel was used to initiate and monitor the tuning sequence.notice how the auto-tuner switches the output to cause the process (as evidenced by the pv value) to undergo small oscillations. the frequency and the amplitude of the pv oscillations are indicative of the process gain and natural frequency. 7 public area distribution box set taking into account the future needs of the business re-decoration of public areas must be reserved for power. here the design needs to consider the following points: question of how much reserve power, lighting and electricity, which according to gb50034-2004 architectural lighting design standards table of article 6.1.3 and 6.1.8, commercial building lighting power density value, high-end supermarkets, business offices as 20w/m2, under the decorative lighting included 50% of the total lighting power density calculation requirements, using the reserved standard 40w/m2. in order to facilitate the decoration in each partition set fire lighting in public areas and emergency lighting distribution box distribution box, in order to identify the electrical power distribution decoration cut-off point. the staircase, storage rooms and other parts of the decoration does not need to do, set the power distribution circuit or a separate distribution box, try not to be reserved from the public area of electricity distribution board fed hardcover out. control of lighting in public areas, the majority in two ways, namely, c-bus control system or the ba system, the use of c-bus has the advantage of more flexible control, each road can be fed out of control, adjustable light control; shortcomings is a higher cost. ba system control advantages of using low cost, simple control; disadvantage is that the exchanges and contacts for the three-phase, three-way control may be related both to open, or both, in the decoration of the contacts required to feed the power supply circuit diverge to avoid failure blackouts. design of distribution box 8 in the commercial real estate design, shop design is often only a meter box, and outlet route back to the needs of the user according to their second design, but the shops are difficult to resolve within the power supply fan coil units, air-conditioning system as a whole can not debug. the project approach is to add a circuit breaker in the meter box for the coil power supply, another way for users to use the second design, as shown below. user distribution box design 9 distribution cabinet / box number and distribution circuits large-scale projects are often low voltage distribution cabinet / box number, low-voltage circuits to feed the more often there will be cabinet / box number and line number duplication, resulting in the design and the future looks difficult maintenance and overhaul. the project has three 10kv substations, 20 transformer, hundreds of low-voltage fed out of the closet, fed the circuit more. accordance with the international electrotechnical commission (iec) and the chinese national standard requirements: all the distribution number to be simple and clear, not too box and line numbers are not repeated. number to simple and clear, not too long. distinction between nature and type of load. law was easy to find, make viewer at a glance. based on the above requirements and on the ground, fire district and the underground construction industry form the different conditions, using two slightly different ways. essential for the underground garage, uses a single comparison, also relatively fire district neat, according to fire district number, such as al-bl-1 / 1, ap and ape, the meaning of the letters and numbers: al on behalf of lighting distribution (ap on behalf of power distribution box, ape on behalf of the emergency power distribution box); bi on behalf of the basement; 1 / 1 for partition 1, i fire box. above ground is more complex, more fire district, and on the fire district does not correspond to the lower, according to shaft number is better, such as al-1-a1, ap, and ape, letters and numbers mean: 1 represents a layer; a1 on behalf of a, no. 1 shaft fed a distribution box. fed a low-voltage circuits, such as the number of uses: w3-6-al-1-a1, w3-6) indicates that the route back to power supply transformer 3, 6, feed the power distribution cabinet, al-1-a1, said the then the first loop of the distribution box for the al-1-a1 and so on, and so on. 10 conclusion with more and more complex commercial design projects, designers need to continually improve the design level, designed to make fine. these are only bits of the design in the business lessons learned, and the majority of designers want to communicate 浅谈高层建筑供配电系统设计 摘要：随着城市规模的不断发展，高层建筑越来越多，因此，高层建筑电气设计就成为设计者不得不面对的问题。本文结合工程实例，介绍了高层建筑电气设计中一些比较典型且具有普遍意义的问题，结合某工程的实际做法阐述了问题的解决方法。关键词：高层建筑；电气设计；配电；负荷计算 1工程概况本项目商业综合大楼，总建筑面积为405570m2，地上建筑面积272330m2，地下建筑面积133240m2,主体高度99m。项目组成为：办公楼两座，建筑面积为708