The aluminum busbars insulation materials are divided into three main categories: thermal shrinkable tube, polyester film and powder coating insulation.
PVC heat-shrinkable casing is not only thick thermal conductivity, but also easy to age, continuous service life is not more than 15 years;
Polyester film is polyethylene terephthalate as raw material, adopting legal system into a polymer film, it not only high insulation performance, and can stretch up to 10 microns thickness, so thin film is easier to transfer the heat generated by the conductor.Polyester film products are the best performance of dupont Mylar (insulation grade B, heat resistance 130 degrees, use years 50 years), but the price is also the most expensive.
Powder coating insulation just as its name implies is to adopt the method of classic spraying powder with insulation ability to aluminum busbars surface ACTS as insulation materials, this kind of technology seems to be novel, but it has a large hidden trouble, powder coating, 3750 v low voltage electrical pressure standard must ensure that the spray powder has certain thickness, the thickness is too big for conductor of heat.Another unstable factor is: spray powder went up if not serious can cause peeling coating when it is assembled, and later in the busbar current operation process with the vibrations of aluminum busbars , are prone to coating wear phenomenon.
