Insulators

There are broadly three types of insulators on the basis of dielectric material – Ceramic/Porcelain insulators, Composite/ Polymer insulators and Glass insulators. As the voltage level increases the size (length) of the insulator required is large and vice-a-versa is also true. The insulators are generally designed based on mechanical and electrical requirements considering altitude, load application, pollution level. The shape of insulators is influenced by considering electrical, mechanical requirements.

The insulators are used in transmission and distribution network, electrical traction system (railway, trolley bus, tramway etc.) telegraph and telephone lines or in equipments like Surge arresters, circuit breakers and instrument transformers.

Indian Insulator Industry is continuously keeping pace with technological advancement that is occurring globally. The domestic industry manufactures various types of insulators in all ranges for LT, HT and EHT. The industry is also manufacturing insulators for 1200 kV which is currently the highest voltage in the world.

Central power sector, state electricity boards, distribution companies, private sector power transmission companies, railways and telecom sector are all major customers for this industry. The insulator manufacturers have already supplied significant volumes of 765 kV insulators i.e. more than 4 million insulators in Indian market. In order to meet the country’s growing demand of up to 1200kV, all major domestic insulator manufacturers have also strived to build sufficient capacity of insulators. Indian manufacturers are not only catering to Indian market but it has also reached to more than 75 countries including European countries, USA, Africa and Latin America. This has proved the technological capabilities of our country to supply high quality products.