Busway product development structure

The first generation: Air-type Since the mid-50s of the last century, Beijing Baifangfang Airport Electrical Appliance Factory has represented the conductive row with an insulating liner to support the inside of the casing and is insulated by the air medium. .................. Phase distance 50mm

The second generation: Intensive The beginning of the mid-1980s, represented by the Zunyi Changzheng Electric Control Equipment Factory, the conductive strips were covered with insulating materials and then fastened together with both sides. Insulation Materials:

Teflon tape, working temperature 200 degrees, disadvantages Poison gas (octafluoroisobutylene and phosgene) produced during pyrolysis

Polyester films have flammability, poor elongation and tear resistance, and are brittle and brittle resulting in cracks in the insulation layer and discharge and short circuits.

Polyvinyl chloride heat shrinkable tube, the quality is very different, some manufacturers use cheap products, measured insulation can not reach class B.

Irradiation cross-linked flame-retardant tape (PER) is currently a good thing, working temperature 150, waterproof performance, elasticity, wrapping more closely.

The overall disadvantage is that the insulating layer may get wet and (short circuit exists between the insulating layers).

The third generation: Insulating busbars In addition to the conductive strip itself has an insulating layer, there is a certain degree of air dielectric insulation between the phase lines. Cured insulation technology is used at various bends. The straight section uses MT-7-3 rubber casing.

Vulcanized Insulation Technology: The material is CZ260 fast solid insulation powder, using four-way crosslinking curing, no gap between insulation layer and conductive row. Its thermal performance, moisture resistance, and insulation reliability are all excellent.

Other relevant circumstances:

1. In 1995 and 2000, the result of national supervision and spot checks, the pass rate of domestic busway increased from 57.14% to 71.4%.

2, busbar welding: L-shaped (flat) and T-shaped busbars, are using busbar welding, the current national standard has no relevant standards, is said to consider the use of weld inspection, (according to GB3323 level III standard)

3, now has a high degree of protection IP54 or more, to solve the waterproof problem. Shanghai Waigaoqiao adopted the domestic IP68 outdoor busway.

4, compared with the advantages and disadvantages of the cable, simply the difference between the trunk power supply and radial power supply.