Do you know about scheduled maintenance of bus ducts and bus connection failures?

The contact resistance and temperature rise of the connection points at both ends of the bus duct and the plug-in connection of the branch line, and the use of high-quality insulation materials in the bus duct, thereby improving the reliability of the bus duct and making the entire system more complete. After all bus voltages disappear, the dispatcher should immediately turn on the switch that may be called (including the bus tie switch) and notify the operation team to conduct an external inspection of the bus. When the bus slotting voltage disappears due to a fault and obvious short circuit signs appear, the operating team members are not allowed to resume operations on their own and should conduct a detailed inspection of the bus equipment.

The failure of the components connecting the bus duct and the busbar or the failure of the parallel switch causes the busbar to lose voltage, so the busbar should be inspected in detail. After isolating the faulty component of the bus duct or opening the knife doors on both sides of the faulty shunt switch, the busbar should quickly resume operation and be discharged from another parallel device. Bus ducts are well used in some high-rise buildings and large factories. They are mainly used in power supply systems to make the wiring of the power system simple. However, the busbar duct will be hot and cold during operation. The insulation layer will expel moisture when it is hot and absorb moisture when it is cold. This will reduce the insulation quality and the joints will become loose and oxidized.

Bus ducts need to be maintained and inspected regularly. During maintenance and inspection of bus ducts, usually check whether all fasteners and the contacts of the conductive parts are loose; check whether the insulating materials have deteriorated and aged, and whether the conductive parts have melted and deteriorated. ; Check whether there is any foreign matter entering the bus duct or whether there is water seepage. The metal enclosed shell of the busbar can protect the busbar from mechanical damage or animal damage. The installation of plug-in units in the power distribution system is reliable. The shell can be grounded as a whole. The grounding is very reliable, while the PVC shell of the cable is susceptible to mechanical and animal damage. If the cable is damaged, the power supply must be cut off before installing the cable.

It will be very dangerous if an error occurs, especially if the cable needs to be grounded on site. Unreliable grounding will increase the risk. The busbar uses copper or aluminum busbars, which have high current density, low resistance, small skin effect, and do not need to be derated. Small voltage drop means small energy loss, saving users' investment. For cables, since the cable core is a multi-stranded thin copper wire, its root area is larger than that of a busbar with the same current level. Increased voltage drop and prone to heat generation. The energy loss of the line is large and it is easy to age.