Role of insulators and their types and use of light arresters

An insulator is the material whose internal charges do not flow easily and when they are under the influence of electrical charge they do not allow electricity to pass. . This property of the insulator is used in transmission and distribution of electricity. They are used to support the electrical conductors and prevent the flow of current from overhead transmission lines to earth below.

Insulators come in three types. The pin insulator are used in the pin on the cross arm of the electrical pole .The upper end of the insulator has a groove. The conductor is passed through this groove and is tied with the insulator by the insulating wire. The pin insulators are used in transmission and distribution line of current up to 33 kV. Beyond, that current, the pin insulators are considered too bulky.

Suspension insulators are used for current beyond 33 KV. The suspension insulator contain series of insulators and line of the conductor is carried by the bottom most insulator in the series. Each part of the series is called disc, because they looked like disc. The benefit of suspension insulator is that it can be increased by adding number of disc for carrying any voltage. Another benefit of suspension insulator is that in case of any damage to one disc, it can be changed easily. The mechanical stress on the suspension insulator is low as it is suspended from a flexible string. However, suspension insulators are costlier than pin insulator and it need more height of the supporting structures to keep conductor clear of the ground.

Stay insulator is used in the low voltage lines. The insulator Porcelain insulators manufacturers in Delhi material of the stay is porcelain. The designing of the stay insulators is done in such a manner that in case of any breakage of the insulator, the transmission line will not fall to the ground.

The shackle insulators are used in low voltage systems. It is used both in horizontal and vertical position. The tapered hole of the insulator distributes the load evenly and reduces the possibility of damage under heavy load conditions.

Lighting arresters are Lightning Arresters Manufacturers in Delhi used to protect the buildings and individuals from lighting strikes. The lighting arrests allow the voltage surge to pass to earth without damaging installations. The major difference between insulator and lighting arresters is that lighting arresters are good conductor of the current while insulators have to be bad conductor of the current.