GEM-1200A/5P high-voltage isolated phase bus duct

GEM-1200A/5P high-voltage isolated phase bus duct

Horizontal installation of busbar channel, spacing between two brackets≯2500Mm, vertical installation spacing≯3600㎜。2When installed vertically, the installation bracket should be drilled with holes on the side panel of the channelM6-M8Tighten the bolts.3The installation construction process and busbar trunking should prioritize the construction plan from the feeding power system, from the main busbar to the branch busbar.4Basic sequence for installation of enclosed busbar channels: Select wiring direction→fixed bracket→Tighten the groove with four bolts→Add bus joint plates and insulation pads alternately→Single head bolt inserted into insulation sleeve→Bolt penetration into the reserved hole of the busbar→Tighten both ends→Add half of the upper and lower cover plates→Fix the channel onto the bracket.5The installation of the channel busbar should be reliably connected to the grounding grid of the electrical equipment between the beginning, middle, end, and channel shell. The outer shell of the channel coated with insulation material should be connected to the grounding bolt between the two channels using flat copper tape or yellow green alternating cables to ensure that the entire channel is connected as a grounding system.6After the installation project is completed, the dense insulated bus duct should be tested for phase to phase insulation and ground insulation resistance using a shaking meter before power transmission①Low voltage busbar channel not less than20MΩ; ②For6~10KVThe insulation resistance of the high-voltage bus duct channel shall not be lower than1200MΩ.35KVThe insulation resistance is not small3000MΩ

A safety protection baffle is designed at the insertion hole, and the plug-in box can only be connected when the baffle is opened, effectively preventing dust and foreign objects from entering the socket, thereby improving the protection of the busbar duct, preventing misoperation, and greatly improving the safety of the busbar. The protection level of the shell includesIP40~IP54Flexible selection can be made according to the installation and usage environment to achieve busbar trunking*Economic transmission. According to system requirements, plug-in interfaces can be set at any position in the bus duct, which is fast to install, easy to tap, and safe to use. The cross-sectional area of the bus duct is small, saving space, while cables require a large installation space. Bus ducts can be controlled at a location close to the equipment, while cables must be controlled in the distribution room. The bus duct is equipped with standard installation brackets, and the isolated phase enclosed bus duct does not require any other support. The cables must be laid using separate cable trays or pipes. The lifespan of the bus duct can reach50The cable has a short lifespan and cannot be reused. The sub interface of the bus duct can add sub circuits, and the cables must be laid in the distribution room. The insurance cost for installing bus ducts is relatively low, while the cost for cables is relatively high.

Similarity of processing schemes during operation(1)Before the defects are handled, the provincial middle note shall reduce them appropriately5The generator has active and reactive loads. The electrical operator on duty should strengthen inspections, perform continuous temperature measurement work, install a temporary exhaust fan, blow air externally to cool down, and try to control the temperature at the overheated area.(2)Both ends of the expansion joint have flanges on the outer side of the flexible joint box24We plan to install connecting small aluminum bars between each pair of fixed bolts one by one, in order to divert the flow of the concealed crossover aluminum bars and reduce heat generation.

Post shutdown processing procedure(1)Disassemble the rubber sleeve of the expansion joint, and after inspection, it was found that there was no serious loosening of the fixing bolts of each cross connected aluminum bar. But some of the fastening screws have obvious signs of electrochemical corrosion, causing contact failure and overheating, especially the fixing screws corresponding to the overheated areas. untie12The block is connected to a transitional aluminum busbar, and the overheated and electrochemically corroded parts are polished and coated with electric grease to enhance conductivity and prevent oxidation, in order to address the heat caused by high contact resistance.(2)Considering5The generator set has been in operation for many years（1981Annual operation), to enhanceBThe current carrying capacity at the connection of the enclosed busbar expansion joint shall still be treated according to the above planBInstallation between the outer flanges of the flexible joint box at both ends of the expansion joint24Root section50mm×5mmConnect the small aluminum bars in order to12Block embedded cross connected aluminum bars for diversion, while increasing surface heat dissipation capacity and treatment conditions

GEM-1200A/5P high-voltage isolated phase bus duct

Suitable for AC three-phase four wire, three-phase five wire system, frequency 50-60HZ, rated voltage up to 660V, rated working current 250-5000A power supply wiring system, undertaking distribution tasks, used for connecting low-voltage distribution panels with large and medium-sized loads, as a high current transmission, used for connecting power transformers with low-voltage distribution panels and heavy-duty loads. Mainly used in modern workshops, automobile manufacturing plants, electric welding wires in the motor manufacturing industry, industrial electric furnaces, factories, and high-rise buildings. Cable trays used in the equipment manufacturing industry and equipment automation production line industry in metallurgy, petroleum, chemical, vehicle and ship, hydraulic machinery and other fields. High purity electrolytic copper is used, and the entire surface of the conductor is tinned to improve its resistance to oxidation and corrosion. After processing, PVC pipes are heat shrink treated, and insulation blocks are used to separate the phases and ground. The copper busbar is double insulated for protection, greatly improving its insulation performance, and then enclosed in a grounded metal shell.

Due to the use of high-strength ceramics as phase separation materials, bus ducts can withstand strong electrical and thermal stresses. The bus duct is a fully enclosed structure with a protection level of up to IP54. Check if there is any looseness in the connecting bolts and contact parts of all bus duct joints. Prevent the phenomenon of joint heating caused by increased resistance due to looseness. Bus duct is the third generation of bus duct products on the market, which started in the early 1990s. It combines the structural characteristics of air type busbars and dense bus ducts, that is, the conductive busbars are wrapped (using high temperature and pressure resistant polytetrafluoroethylene film wrapping), and then separated by phase block phase copper bars to achieve double insulation. Bus duct cables need to be tapped on site, which has poor reliability. Even prefabricated branch cables have obvious disadvantages. The production of high-voltage bus ducts mainly requires customization from factories. The branch connection method of high-voltage bus ducts uses open "C" type clamps. After a long time, can the clamping force be guaranteed for Xichou high-voltage bus ducts? Due to the high cost of each branch head, prefabricated branch cables are still not widely used today. Any floor needs to cut off the power supply, and the bus duct does not need to be powered off. As long as it is unloaded, the plug-in box of the bus duct can be removed. But it is very dangerous to cut off the branch power supply of the prefabricated branch cable while it is live.