• Categories:Industry news
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• Time of issue:2021-12-08
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(Summary description)Traditionally, outsourced fire-resistant and waterproof bus ducts use dense waterproof bus ducts, wrapped in rock wool or high-temperature resistant mineral materials, and then use fire-resistant boards to achieve fire protection functions. In the case of sufficient space, the fire resistance and fire resistance performance of the fireproof and waterproof bus duct can be infinitely improved by thickening the outer insulation material. For example, depending on the external insulation material, the fire resistance time of the waterproof busbar duct needs to be increased from 2 hours to 4 hours. Can thicken the fire resistance parameters to achieve fire resistance performance indicators. This fire-resistant and waterproof busbar duct is widely used in workshops.
The disadvantages are:
Due to the outsourcing of insulation materials, the heat generated by the internal operating unit during the electrification process cannot be discharged. When the fire-resistant and waterproof bus duct is powered on for a long time, the inability to cool down can damage the insulation material between phases, resulting in the waterproof bus duct not working properly and even causing accidents. Cannot be used simultaneously under daily conditions; In order to alleviate heat dissipation issues, individual densely packed fireproof and waterproof bus ducts are equipped with a fire breathing network at regular intervals, which is a one-way ventilation outlet and a fire enclosed type, that is, it is directly closed after a fire.
Waterproof bus ducts require direct combustion with open flames to be effective. It cannot be closed under general fire conditions; If a fire occurs, watering will cause water to directly inject into the conductor, leading to a major short circuit event; The installation of fire breathing valves at intervals cannot evenly dissipate heat inside the waterproof bus duct, and there is still a situation where local temperatures cannot be reduced.
The fireproof board and fireproof cotton inside do not have waterproof performance. They will become waste under water spray or immersion and need to be replaced. This leads to high environmental requirements for the use and installation of such fireproof and waterproof bus duct products, and limited application scope; Large volume, external insulation layer must be installed on site. The installation process is complex, the workload is large, the required laying and construction space is large, and the construction period is long.
The waterproof busbar duct and busbar are actually closed one by one, while the other is not closed. The enclosed busbar, abbreviated as waterproof busbar duct, refers to the waterproof busbar duct, which is the vest of the enclosed busbar. The enclosed waterproof busbar duct and busbar refer to the same thing. The enclosed waterproof busbar duct is a busbar system composed of metal plates (steel or aluminum plates) as protective shells, conductive strips, insulation materials, and related accessories. It can be made into a plug-in enclosed busbar, with a junction box or feeder enclosed busbar inserted in the middle and no junction box in the middle. It is a busbar that encloses the main busbar with a metal casing. The enclosed waterproof busbar duct has the following advantages:
1. It is conducive to standardization and good interchangeability.
2. Enclosed enclosures are usually made of non-magnetic or weakly magnetic materials to reduce heating. 3. The busbar is enclosed, improving the system's anti pollution ability. Suitable for areas with severe dust and high air humidity such as coal, paper, and chemical industries.
Closed busbar can be divided into densely insulated busbar and air insulated busbar, suitable for rated working voltage of 660V and rated working current of 250-2500A. A three-phase four wire or three-phase five wire power supply and distribution line with a frequency of 50Hz has a compact structure, high insulation strength, high transmission current, good interchangeability, stable electrical performance, convenient installation and maintenance, and long service life. Service life. Series functions.