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你知道低压母线槽怎样安装吗?

  有许多种母线槽是由钢或铝合金制成的。因此,在高层建筑电气安装中,母线槽的安装是非常重要的。如何安装低压母线?让我们来看看。
  There are many kinds of bus ducts made of steel or aluminum alloy. Therefore, in the electrical installation of high-rise buildings, the installation of bus duct is very important. How to install the low voltage bus? Let's see.
  1. 低压母线通道连接
  1. Low voltage bus channel connection
  1. 低压母线槽与低压母线槽的连接。低压母线和低压母线之间有两种连接方式:插入式和对接式。从以往的运行情况来看,每一次事故都发生在低压母线槽内,是由于接头受热,绝缘层损坏,导致相间短路。低压母槽接头热稳定性计算公式:
电缆桥架
  1. Connection between low-voltage bus duct and low-voltage bus duct. There are two connection modes between low voltage bus and low voltage bus: plug-in type and butt type. From the previous operation, every accident happened in the low-voltage bus duct, because the joint was heated and the insulation layer was damaged, resulting in the short circuit between phases. Calculation formula for thermal stability of low pressure main tank joint:
  母线接头在更大电流时的更大允许温度的计算值;与更大电流前母线接头初始工作温度对应的计算值;时间;更大稳定电流。从计算公式可以看出,温升值与更大稳态电流平方的时间成正比,与接触面积的平方成反比。因此,接触面积越大,对应的温升值越小。为了防止发热,必须增大低压母线接头的接触面积。
  The calculation value of the maximum allowable temperature of the bus joint at the maximum current; the calculation value corresponding to the initial working temperature of the bus joint before the maximum current; time; maximum stable current. It can be seen from the calculation formula that the temperature rise is directly proportional to the time of the square of the maximum steady-state current and inversely proportional to the square of the contact area. Therefore, the larger the contact area, the smaller the corresponding temperature rise. In order to prevent heating, the contact area of low voltage bus joint must be increased.
  从这个角度看,低压母线槽的连接是低压母线槽安装中的薄弱环节,也是低压母线槽安全运行的隐患。有效地消除隐患,保证连接器的低压母线槽的安装质量,首先在低压母线槽的安装,在设置关节两侧的500毫米横臂架,确保低压母线槽联合部队,不是两个相同的低压母线槽的线,增加低压母线槽连接器的接触面积,涂以电力联合复合,增加接触面积。第三,用扭矩扳手按规定扭矩(ml0为20n)拧紧芯绝缘螺栓。M M12等于70N。M, M16是115N.M);
  From this point of view, the connection of the low-voltage bus duct is the weak link in the installation of the low-voltage bus duct, and also the hidden danger of the safe operation of the low-voltage bus duct. Effectively eliminate the hidden dangers and ensure the installation quality of the low-voltage bus duct of the connector. First, install the low-voltage bus duct with a 500mm cross arm on both sides of the joint to ensure that the joint force of the low-voltage bus duct is not the center line of the two same low-voltage bus ducts, increase the contact area of the low-voltage bus duct connector, and apply the power joint compound to increase the contact area. Third, use a torque wrench to tighten the core insulation bolt according to the specified torque (ml0 is 20n). M M12 is equal to 70N. M. M16 is 115N. M);
  2. 低压母线槽与变压器的连接。低压母线槽与变压器的过接采用膨胀接头。但由于变压器低压出口侧的设计电流较大,相应的膨胀节截面也较大,但弹性较小,变压器低压套管仍处于受力状态。因此,变电站变室低压母线如图1所示连接,固定在“刚性”槽钢上。这样,膨胀节的“柔性”与槽钢支架的“刚性”连接相匹配,使变压器低压套管不受力损坏。
  2. Connection of LV bus duct and transformer. The expansion joint is used for the over connection between the low-voltage bus duct and the transformer. However, due to the large design current at the low-voltage outlet side of the transformer, the section of the corresponding expansion joint is also large, but the elasticity is small, and the low-voltage bushing of the transformer is still in the state of stress. Therefore, the low-voltage bus of substation substation is connected as shown in Figure 1 and fixed on the "rigid" channel steel. In this way, the "flexibility" of the expansion joint is matched with the "rigidity" connection of the channel steel support, so that the low-voltage bushing of the transformer is not damaged by stress.
  低压母线的安装
  Installation of low voltage bus
  1. 低压母线槽圆钢吊装的缺点。圆钢吊装是一种“柔性”固定,只能吊起低压母线槽,使其无法向下移动。低压总线插槽时受到扭转应力的影响由于短路电安装或操作期间,它可能改变左右或,这使得低压总线插槽关节松散和增加接触电阻,导致严重的加热联合(特别是低压套管可能受损,等等)。
  1. Disadvantages of round steel hoisting of low-voltage bus duct. Round steel hoisting is a kind of "flexible" fixation, which can only lift the low-voltage bus duct to make it unable to move downward. The low-voltage bus slot is affected by torsional stress because it may change left and right or during short-circuit electrical installation or operation, which makes the joints of the low-voltage bus slot loose and increases the contact resistance, leading to serious heating joint (especially the low-voltage bushing may be damaged, etc.).
  2. 低压母线通道的固定方法。根据以上分析,低压母线槽由槽钢支架支撑,低压母线槽两侧用压板固定在槽钢支架上,槽钢支架用“刚性”支撑和吊架固定。
  2. Fixing method of low voltage bus channel. According to the above analysis, the low-voltage bus duct is supported by channel steel bracket, both sides of the low-voltage bus duct are fixed on the channel steel bracket by pressing plate, and the channel steel bracket is fixed by "rigid" support and hanger.
  3.低压母线槽的两端作为低压进线的相位关系
  3. The two ends of the low-voltage bus duct are used as the phase relationship of the low-voltage incoming line
  4. 变压器与低压进口柜之间。由于土木工程结构设计,改变配电设备布局设计、配电设备制造商设计的原因,如低压配电设备两端的母线槽相序不到位,导致变压器和低压进线柜不能直接连接到低压母线槽,小电流使用辅助进箱母线换位(通常是零母线换位)连接,大电流(大于1000a)通过换向接头连接;
  4. Between transformer and low-voltage inlet cabinet. Due to the structural design of civil engineering, the change of the layout design of distribution equipment and the design of distribution equipment manufacturers, for example, the phase sequence of bus ducts at both ends of low-voltage distribution equipment is not in place, resulting in that the transformer and low-voltage incoming cabinet cannot be directly connected to the low-voltage bus duct, the small current is connected by the auxiliary incoming box bus transposition (usually zero bus transposition), and the large current (greater than 1000A) is connected by the reversing joint;
  5. 低压馈线柜与低压电气控制屏之间。由于工艺设备布局设计和工艺设备与低压电气控制面板制造商设计、低压配电设备两端的母线槽相序不到位,使低压馈线柜和低压电气控制面板不能直接连接到低压母线槽,和辅助成盒连接总线换位(通常是零母线换位)连接的小电流,大电流通过换向接头连接(大于1000a),使低压母线两端的器件在同一相位正确连接。
  5. Between low-voltage feeder cabinet and low-voltage electrical control panel. Due to the layout design of process equipment and the design of manufacturer of process equipment and low-voltage electrical control panel, and the phase sequence of bus duct at both ends of low-voltage distribution equipment is not in place, the low-voltage feeder cabinet and low-voltage electrical control panel cannot be directly connected to the low-voltage bus duct, and the small current connected with auxiliary box connection bus transposition (usually zero bus transposition), The large current is connected through the reversing joint (more than 1000A), so that the devices at both ends of the low-voltage bus are correctly connected in the same phase.
  以上是电缆桥架厂家为大家介绍的相关内容,想要了解更多内容,欢迎访问网站:http://www.sdhangfeng.com
  The above is the relevant content introduced by the cable tray manufacturer. To learn more, please visit the website: http://www.sdhangfeng.com
 
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