Power distribution design for highWord格式文档下载.docx

1、As Chinas national economic development, building more and more land, more and more precious land resources, prompting the development of various types of construction to the high-level, so high-rise building fire safety is increasingly a cause-oriented. For the characteristics of high-rise building

2、 fires, high-rise building fire safety design should be based on self-defense self-help, while the fire service for the distribution is to ensure the normal operation of the key fire-fighting facilities, directly related to high-rise building fire safety. Therefore, this article from the fire power

3、configuration, fire distribution, fire electrical wiring for high-rise building power supply and distribution reliability analysis, propose appropriate solutions to ensure high-rise building fire safety standards.1. High-rise building fire power scheme1.1 specification power supply requirements for

4、fireAccording to fire protection design of tall buildings （hereinafter referred to as high regulation） provides high-rise building fire power should be the current national standard for power distribution system design specifications, the requirements of the design, a class of construction by a load

5、 of required power supply, second-class high-rise buildings should be two power load requirements. According to civil electrical specifications （JGJ/T16-92） provides a load consists of two power supply, when a power failure, the other at the same time the power outage Buzhi Yu; a load is especially

6、important in load, in addition to the above-mentioned two power supplies, theMust also be an additional emergency power supply of the third power; 2 load power should make sure that when the power transformer failure or circuit common failure, without interruption of power supply （or the rapid recov

7、ery after the interruption）, the load is relatively small or regional power supply The difficult conditions, the two loads can be more than a return to 6KV dedicated overhead power lines or cables.1.2 The composition of high-rise building fire powerFire power is to ensure that high-rise building and

8、 fire normally fire-fighting equipment under normal electricity supply. Generally considered the main power supply and pose a fire emergency power supply. When the main power failure, emergency power supply can continue to supply to the fire-fighting equipment. Commonly used in emergency power suppl

9、y are: （1） independent of the normal power-generating units （2） power supply network, independent of the normal power supply dedicated feeder circuit. （3） battery; （4） dry batteries.1.3 common Fire Power1.3.1 Dual Power high-voltage single-supply bus is not sub -Dual power high-voltage power supply

10、section is not a single bus, two-loop high-voltage power supply at the same time, prepare a normal one to use, in this way to reduce contact between cabinets and a voltage transformer cabinet, saving infrastructure investment, reducing the high voltage distribution Electric room building area is ben

11、eficial to both, this approach requires two-way are guaranteed 100% of the load of electricity, when the cleaning bus or bus failure will cause all the power outages, poor reliability of their electricity supply is generally not used in high-rise construction.1.3.2 Dual Power high-voltage single-sup

12、ply busbar sectionDual power supply high-pressure single-busbar sub-way, two-loop high-voltage power supply at the same time, each other back. High reliability of this approach, particularly for electrical equipment, fire two power requirements at the last and easy to implement the provisions of a s

13、witch, which is relatively common wiring.1.3.3 3 power supply high-pressure single-bus sub -Three sub-power high-voltage single power supply bus, three-loop high-voltage power supply, the normal dual-use when a preparation, this approach has a high reliability, suitable for a larger load capacity of

14、 the important users.1.3.4 a main high voltage power supply, 380V power supply for the city, emergency power supply networkSmaller building, was not by the consumption, the local access to two power supplies and difficult, in the vicinity have 380V power supply when the main power supply can be used

15、 a high-voltage power supply, 380V power supply for emergency power supply. If the economy can also be allowed if the use of diesel generator sets for emergency power supply.1.4 plus the idea of diesel-powered generator setsAt present high-rise buildings, international and domestic universal power s

16、upply is based on the dual-power supply was equipped with a diesel generator as an emergency power supply, which is especially important to meet a load of power supply load requirements （Figure 1 does not include the dotted line part of the ）. However, dual power plus the power supply of diesel gene

17、rating sets in most parts of northern China are still subject to weather conditions. As a long time in the north in winter, the temperature low. As an emergency power supply diesel generator sets at low temperatures is difficult to immediately start power supply, and some even two or three minutes c

18、an not start.The dual power supply in most parts of 10KV substation quoted from the same strict sense, its essence is a power failure when the substation, the two power supplies also failed, causing power supply system completely paralyzed. In fire cases, this will expand the fire, causing serious l

19、osses is not allowed. Therefore, I envisage the dual power on diesel generator sets based on the season, plus a power supply, and enable it to their own independent power supply.In the case of low winter temperatures, reducing the reliability of diesel generators, we will connect the power this seas

20、on, for increasing theElectric system reliability. When the temperatures rise, we stopped the season to the power supply department reported that power supply, you can save running costs. And this season there are three power options: First, quoted all the way from the substation 10KV high voltage p

21、ower supply as the season （Figure 1）, the advantage of high reliability power supply, the shortfall is that the higher investment in infrastructure; second is from a nearby high-rise buildings along 10KV transformer high-voltage end of the quoted or cited all the way low end of the season as a 380/2

22、20V power supply; third all the way from the city network cited as the season 380/200V power supply.1.5 Building Configuration Thinking of diesel generator setsHigh regulation fire-fighting equipment supply should be provided for the power distribution system design specifications GB50052-95 require

23、ments of the design, and the specification of a load is especially important in load did not involve the fire load in their fire power as long as there two power supplies can meet the requirements of also requires a class of high-rise building fire load electricity requirements should be a power sup

24、ply, and a distribution box office in the final automatic switching device to ensure that fire safety facilities in When the fire power and reliable, able to function properly. In the is not clearly defined one, second-class high-rise buildings need to configure the diesel generators.Thus in recent

25、years, newly emerging high-rise building fire load does not require allocating additional diesel generators. However, the specific power supply design, the vast majority of high-rise buildings from the electricity grid connection of two-way line of 10KV power into electricity, which can not meet the

26、 specifications where two power supply requirements. System blackout caused either by an internal fault, some caused by power failures, as a regional power grid in the main grid voltage of the upper part is a grid, so the user either from electric power line to take a few back into the line also can

27、 not be in the strict sense of the two an independent power supply, power grid failures can cause a variety of all the power into the line at the same time a result of loss of power supplyBlackout. In fact, the Road 10KV high voltage power supply taken from a different substation is very difficult,

28、and diesel generating sets to configure a small investment, the use of good results and will comply with regulatory requirements, so the design of high-rise building shall be fitted with diesel-powered generator sets. I think that explicit requirements specification which can be high-rise buildings

29、should be equipped with diesel generators.2. High-rise building fire distribution2.1 common Fire Distribution ProgramFire distribution methods are commonly used in radiation type, tree type, chain, four kinds of hybrid（1） The radial distribution of the failure of any one line to each other affect ea

30、ch other, the equipment is easy to manage a high supply reliability. However, more than qualifying non-ferrous metals consumed in large quantities, switching equipment, and more investment in higher operating costs for a single piece of equipment of large capacity, power supply reliability high. （Fi

31、gure 2 a）（2） The trunk-type distribution when the route failure, a larger sphere of influence, but coupled with alternate routes and to achieve switching to improve power supply reliability for a more uniform distribution of places. （Figure 2 b）（3） chain and the trunk-type is basically the same, but the low-reliability than the trunk, when the middle of a piece of equipment failures associated equipment in the bac