AB (Air Breaker) switch :
It is an essential unit of all overhead power transmission line which is used to connect (or) disconnect the power system of a certain part of overhead cable and Transformer from the main power distribution line.
Type :
The design of GOAB switch (or) Gang operated Air Breaker switch are depends on their uses and application like :
* Two post type
* Telting type
* Telting type - Double stack insulator
* Rotating type
* Rotating type - Double stack insulator
* Single phase switch
* Change over switch
* Disconnecting switch
Capacity :
* System Voltage - 11kv, 22kv & 33kv
* Amp - 200A, 400A, 800A, 1200A etc..
* System frequency - 50 Hz.
Construction :
AB switch are made by galvanized steel base, 11kv of each insulator, copper alloy male-female contacts, Arching horns, for power connect/ disconnect operating, two adjustable pin fitted on the steel base frame both sides of the operating post to limit it's travel of many on each side, deserved length of M.S square Rod for Hocking operation, desired length of G.I pipe for operating from ground level and operating handle.
Air Breaker switch are designed as double (or) triple port construction (depend on their type) which can be mounted both horizontal and vertically with the electrical double pole structure (DP structure).
They are usually formed in group of three Switches serially installed whose are operates together. So they are also known as ' Gang operating Air Breaker switch' GOAB switch.
Application/ Uses :
Generally 11kv AB Switch & 22kv AB Switch is used in Power distribution line and 33kv AB Switch used in Power generation & Power transmission line.
Figure :
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