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. 低壓母線通道連接

　　1. Low voltage bus channel connection

　　1. 低壓母線槽與低壓母線槽的連接。低壓母線和低壓母線之間有兩種連接方式:插入式和對接式。從以往的運行情況來看，每一次事故都發生在低壓母線槽內，是由于接頭受熱，絕緣層損壞，導致相間短路。低壓母槽接頭熱穩定性計算公式:

　　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:

　　母線接頭在更大電流時的更大允許溫度的計算值;與更大電流前母線接頭初始工作溫度對應的計算值;時間;更大穩定電流。從計算公式可以看出，溫升值與更大穩態電流平方的時間成正比，與接觸面積的平方成反比。因此，接觸面積越大，對應的溫升值越小。為了防止發熱，必須增大低壓母線接頭的接觸面積。

　　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.

　　從這個角度看，低壓母線槽的連接是低壓母線槽安裝中的薄弱環節，也是低壓母線槽運行的隱患。有效地隱患,保證連接器的低壓母線槽的安裝質量,在低壓母線槽的安裝,在設置關節兩側的500毫米橫臂架,確保低壓母線槽聯合部隊,不是兩個相同的低壓母線槽的線,增加低壓母線槽連接器的接觸面積,涂以電力聯合復合,增加接觸面積。第三，用扭矩扳手按規定扭矩(ml0為20n)擰緊芯絕緣螺栓。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. 低壓母線槽與變壓器的連接。低壓母線槽與變壓器的過接采用膨脹接頭。但由于變壓器低壓出口側的設計電流較大，相應的膨脹節截面也較大，但彈性較小，變壓器低壓套管仍處于受力狀態。因此，變電站變室低壓母線如圖1所示連接，固定在“剛性”槽鋼上。這樣，膨脹節的“柔性”與槽鋼支架的“剛性”連接相匹配，使變壓器低壓套管不受力損壞。

　　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.

　　低壓母線的安裝

　　Installation of low voltage bus

　　1. 低壓母線槽圓鋼吊裝的缺點。圓鋼吊裝是一種“柔性”固定，只能吊起低壓母線槽，使其無法向下移動。低壓總線插槽時受到扭轉應力的影響由于短路電安裝或操作期間,它可能改變左右或,這使得低壓總線插槽關節松散和增加接觸電阻,導致嚴重的加熱聯合(特別是低壓套管可能受損,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. 低壓母線通道的固定方法。根據以上分析，低壓母線槽由槽鋼支架支撐，低壓母線槽兩側用壓板固定在槽鋼支架上，槽鋼支架用“剛性”支撐和吊架固定。

　　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.低壓母線槽的兩端作為低壓進線的相位關系

　　3. The two ends of the low-voltage bus duct are used as the phase relationship of the low-voltage incoming line

　　4. 變壓器與低壓進口柜之間。由于土木工程結構設計,改變配電設備布局設計、配電設備制造商設計的原因,如低壓配電設備兩端的母線槽相序不到位,導致變壓器和低壓進線柜不能直接連接到低壓母線槽,小電流使用輔助進箱母線換位(通常是零母線換位)連接,大電流(大于1000a)通過換向接頭連接;

　　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. 低壓饋線柜與低壓電氣控制屏之間。由于工藝設備布局設計和工藝設備與低壓電氣控制面板制造商設計、低壓配電設備兩端的母線槽相序不到位,使低壓饋線柜和低壓電氣控制面板不能直接連接到低壓母線槽,和輔助成盒連接總線換位(通常是零母線換位)連接的小電流,大電流通過換向接頭連接(大于1000a)，使低壓母線兩端的器件在同一相位正確連接。

　　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.

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