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A.B. Switches (Disconnectors) are mainly divided into two types viz. Horizontal mounting and Vertical mounting. These are mainly used to disconnect (isolate) supply from the load for the purpose of maintenance or removal of fault in the distribution network. As the name itself specify these switchgear are installed in Air Insulated substation.
While designing these switchgears current carrying capacity, system voltages, operational convenience as well as safety of operator is considered. These A.B. (Air Break) switches have mainly three parts viz. Current Carrying parts i.e. Contacts, Insulators and Hardware. MS material is subjected to Hot Dip Galvanization to enhance life of switchgear. The current carrying parts (Fixed Contact, moving Contacts and Breaded Tape ) are mainly made up of High Grade Electrolytic tinned copper.
These equipments are designed as per technical specifications of various Electricity Utilities. A.B. switches are subjected to type test at NABL approved Laboratory as per IS/IEC 62271-102, (Earlier IS:9921) then and then only DISCOMs allows manufacturer to supply after having factory inspection and acceptance of routine tests as per relevant IS/IEC
Rare earth alloy wear-resistant high chromium cast iron pipe under the same conditions as compared with the high manganese steel materials, the unit is a high-manganese steel wear about 1/3, life is more than three times as high manganese steel. Bends and branches seamless steel pipe segment with supporting the use, manufacture applicable irregular pipelines, cutting, welding easy maintenance.
High Voltage Test
Measurement of Resistance by milli-volt drop test.
Temperature Rise Test
Mechanical Endurance Test
Hot Dip Galvanization Test
