Causes of Busway Electrical Accidents and Precautions
It is understood that in a few years ago, an industrial plant in Suzhou, due to improper design and planning, then increased the equipment capacity in the later stage, resulting in excessive overload of the busway and too long, resulting in accelerated aging of the insulation layer, which caused a short circuit between phases and led to a fire. As a kind of electrical equipment, although the accident rate of busbars is lower than that of cables and wires, it is inevitable that accidents will occur, and busway electrical accidents generally have the following reasons:
(1) Improper operation or ineffective inspection: due to operation errors or inadequate maintenance inspection, capillary fibers and dust accumulate inside the busway for a long time, resulting in a short circuit fire between phases under a certain humidity;
(2) Environmental factors: such as high temperature, humidity, acid, strong corrosion, and water environments. are all the causes of busway electrical accidents;
(3) Unreasonable design: due to improper design and planning, the equipment capacity is increased in the later stage, resulting in excessive overload and long overload of the busway, resulting in accelerated aging of the insulation layer, which causes a short circuit between phases and leads to fire;
(4) Reasons for raw materials: In order to gain price advantages in market competition, some manufacturers use low-cost copper bars, inferior insulation materials, and more seriously, use aluminum bars instead of copper bars, PE punching and reducing materials. Although the quality has improved in recent years, it is also uneven;
(5) Problems in the production process: The electrical accident of the busbar mainly lies in the process of making the elbow and the plug-in box, and the busbar link part. Only strict production processes can avoid the disasters caused by production processes.
The above is the main cause of busway electrical accidents, to avoid accidents, it is necessary to solve them from the source, and deal with them in time when problems are found.
The following are some precautions for the safe use of busways:
1. Busway protection level and use environment table:
Be sure to choose the appropriate busway in strict accordance with the specifications in the above table.
2. Pay attention to the busway insulation medium and insulation resistance;
3. Application of copper-aluminum transition technology for aluminum conductor busway;
4. The protection system after the busway is transformed should be done well;
5. The busway plug-in box should be equipped with an interlocking device;
6. The calculation of conductors and ampacity should be accurate;
7. The installation of the busway should also be very careful.
