Composite dry wall bushing
Wall bushings are suitable for power distribution devices and high-voltage electrical appliances in power plants and substations with a power frequency AC voltage of 35kV and below. They are used as insulation and support for conducting parts through walls or other grounding objects. The casing is suitable for the ambient temperature of -40℃～+40℃. It is not suitable for use under the conditions that can reduce the performance of the casing and the indoor surface of the casing is partially condensed.
When the bushing ambient temperature is higher than +40°C but not more than +60°C, it is recommended that the working current of the bushing increases by 1°C according to the ambient temperature, and the rated current load is reduced by 1.8°C.
When the bushing is used when the ambient temperature is higher than +40°C and meets the maximum allowable heating temperature specified in Article 5.1 of GB12944.1, the operating current is allowed to be overloaded for a long time. It is recommended that the rated current is reduced by 1°C according to the ambient temperature The load is increased by 0.5%, but the increase should not be greater than 20% of the rated current.
Our factory has developed a new type of composite dry wall bushing with large creeping distance, which has the characteristics of light volume, light weight, pollution resistance and good explosion-proof performance. The various electrical and mechanical properties of the composite wall bushing meet the standard requirements, especially the silicone rubber umbrella skirt used as external insulation. The good hydrophobicity and hydrophobic migration characteristics of the sheath make the composite wall bushing have Very good resistance to pollution and the ability to prevent pollution flashover. The current of 10kV ranges from 250A-6300A, the current of 20kV ranges from 2000A-8000A, and the current of 35kV ranges from 250A-8000A. Various non-standard products can be developed and designed according to user requirements. The composite dry wall bushing is a wall bushing. The development direction of the tube will eventually replace the porcelain sleeve.
◆ Structure introduction
The wall bushing is composed of glass fiber dipped epoxy resin tube, silicone rubber jacket, conductive inner core, connecting flange, etc. The connecting flange is made of high-strength aluminum alloy; the climbing umbrella skirt is made of silicone rubber by one-time injection molding. Epoxy pipe surface.
◆ Model description
Note: The above model belongs to outdoor-indoor copper conductor pollution-resistant wall bushing, which is suitable for dirty areas where the installation site is not more than 2000m above sea level. For severe and extremely polluted areas with 10kV bushings, 35kV oil-paper capacitive wall bushings can be used.
◆ See the following for the technical parameter table and installation dimension drawing:
Yichang Hengyuan Technology Co., Ltd. is a professional manufacturer of European-style cable connectors, plug connectors, cable branch boxes, American elbows, high-voltage vacuum circuit breakers, high-voltage load switches, lightning arresters, zinc oxide arresters, tank arresters, overvoltage protectors, Counters, monitors, heat-shrinkable cable accessories, cold-shrinkable cable accessories, T-shaped heads, wall bushings, European cable accessories, American cable connectors, transformer neutral point protection devices, fuses, isolation switches, PT cable heads, elbows Manufacturers of type cable joints, 10kV outdoor terminals, switch cabinets, cable intermediate joints, cable accessories and other products
