電纜橋架各連接部位的螺栓緊固
橋架母線槽電磁感應(yīng)在保護地線上感應(yīng)的故障電流經(jīng)實測比理計算還要高出50%，同時三相導(dǎo)電排距PE間距不等，電感也不等，線路較長時，在故障電流下，三相嚴(yán)重不平衡。外面接觸不到母排，可防止外物造成短路；由于山東電纜橋架密集型母線槽外殼作PE線，人觸到外殼也是的；母線槽單位體積較小，安裝后比較美觀；便于分接饋電、維護方便。
The electromagnetic induction of the bridge bus slot electromagnetic induction on the protected ground line is 50% higher by the actual measurement. At the same time, the three-phase conduction distance PE distance is different, the inductance is not equal. When the line is long, the three-phase is seriously unbalanced under the fault current. The outer contact can not reach the busbar, which can prevent the external material from short circuit; because of the PE line of the dense busbar of the cable bridge of Shandong cable bridge, it is also safe to touch the shell; the busbar slot is small in unit volume and is more beautiful after installation; it is convenient for feeding and maintenance.
這樣無論是短時還是持續(xù)相對地短路故障，這種接地方式都比單獨設(shè)置PE排好。因此電氣技術(shù)委員會公布及提倡電匯排(母線槽)以外殼作為接地導(dǎo)體。封閉式母線槽各功能單元的連接部件及活動接頭上的銅排表面必須清理干凈，外殼內(nèi)和絕緣子安裝前也應(yīng)擦試干凈不得有物。豎井內(nèi)高壓、低壓和應(yīng)急電源的電氣線路，相互之間應(yīng)保持0.30m及以上距離或采取隔離措施，并且高壓線路應(yīng)設(shè)有明顯標(biāo)志。
In this way, the grounding mode is better than the PE alone, both in short time and in continuous short circuit. Therefore, the International Electrotechnical Commission announces and promotes the use of the busbar as the grounding conductor. The connecting parts of each functional unit of the closed busbar and the copper surface on the movable joint must be cleaned up, and the shell and insulator should be cleaned before the installation of the remnants. The electric lines of high pressure, low pressure and emergency power supply in the shaft should maintain 0.30m and above distance or take isolation measures, and the high voltage lines should have obvious signs.
外殼的相間短路板應(yīng)位置正確連接良好，相間支撐板應(yīng)安裝牢固，分段絕緣的外殼應(yīng)做好絕緣措施，外殼各連接部位的扭距螺栓應(yīng)用力距板手緊固，各接觸面應(yīng)封閉良好，母線槽的緊固件必須用熱鍍鋅制品。強電和弱電線路，有條件時宜分別設(shè)置在不同豎井內(nèi)。
The interphase short circuit board of the outer shell should be properly connected, the interphase support plate should be firmly installed, the insulating shell should be insulated, the torque of each connection part of the outer shell is fastened to the plate hand, the contact surface should be closed well, the fastener of the busbar groove must be hot-dip galvanized. Strong and weak electric circuits are set up in different shafts under suitable conditions.
采用導(dǎo)電性能良好的非磁性材料鋁合金外殼做保護地線，包圍在導(dǎo)電排四周，由于山東電纜橋架盡可能的靠近三相母排，可做到電抗小，且保護地線與三相母排距離相等，電抗相同。
The non magnetic material aluminum alloy shell with good conductivity is used as the protective earth wire, surrounded by the conductive row. As the Shandong cable bridge is as close as possible to the three-phase bus, the reactance can be minimal, and the distance between the protective ground line and the three phase bus is equal, and the reactance is the same.
如受條件限制必須合用時，強電與弱電線路應(yīng)分別布置在豎井兩側(cè)或采取隔離措施以防止強電對弱電的干擾。密集型母線槽外殼各連接部位的扭距螺栓需要用力距板手緊固，保證各接觸面封閉良好；安裝時需要認(rèn)真對照密集型母線槽系統(tǒng)圖，檢查所有規(guī)格、型號避免盲目安裝，造成返工影響施工安裝質(zhì)量。
If the condition restrictions must be used together, the strong and weak lines should be arranged on either side of the shaft or isolation measures to prevent strong electricity from interfering with weak electricity. The torque bolt of each connection part of the dense busbar shell needs to be fastened to the plate hand, and the contact surface is well closed; when the installation is installed, it is necessary to carefully compare the dense busbar system diagram, check all specifications and models to avoid blind installation, and cause the rework to affect the quality of construction and installation.
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