Friday, 6 February 2015

The Electrical Insulator


Electrical insulation is a material property that consists of the block of electric current, because the resistivity is very high. It is thus the opposite of electrical conduction. Electrical insulation is determined by an electrical voltage to bring about the object of examination by the one pole with a part (side) of this object (possibly a gas or a liquid) and connecting the other pole with a different part (side) of the same object. The electric current in this resistance measurement (or impedance measurement) is running must be negligible to speak of an electrical insulator.

Insulating materials are, for example,

 Plastic, in particular PVC, and XLPE, in wire and cables. Many carpets have been through the use of plastics, a good insulator. Tools such as screwdrivers and pliers have insulating plastic handles.

 Glass insulators on pylons, but also in lamps and screens

 Air in all aboveground transportation of electricity, but also in the variable capacitor in the older radios

 Oil on high voltage electrical equipment such as transformers and switchgear
 SF6, sulfur hexafluoride in electrical switchgear at high voltage or medium voltage

 Ceramics, especially porcelain fuses, insulators for electric fences, overhead lines of train, tram, trolleybus and telephone lines (abroad), in all heating appliances, such as toasters, coffee machines, fittings for halogen lamps, soldering etc.

 Bakelite, especially in the older equipment and installation material, but it is still applied in 2007
 Epoxy, in particular for printed circuit boards in electronic equipment

 Rubber, this is sometimes brands are the static charge of a person standing on rubber soles.
 Pres Spaan, this is a hard-pressed sheet of pure cellulose which is used in oil-in electrical installations in order to isolate very high voltages

 Paper or cellulose is also widely used in electrical installations.