IS 8478 : 1977 Application guide for on-load tap changers

1 Scope

1.1 This application guide is intended to assist in theselection of suitable on-load tap-changers for use in conjunctionwith the tapped windings of transformers or reactors (referred toas transformers in This text).

Note 1 - All the tap-changers referred to shall be presumed tocomply with the requirements specified in IS 8468 : 1977.

NOTE 2 - The provisions of this application guide are notmandatory and only represent advice to the tap-changermanufacturers and purchasers. The responsibility for the correctapplication of the fully assembled top-changer in connection withthe transformer is with the manufacturer of the transformer.

2 References

IS 2 :1960Rules for rounding off numerical values

IS 2026 : Part I :1977 Specification for powertransformers:Part I General

IS 2026 : Part IV :1977 Specification for power transformers:Part IV Terminal markings, tappings andconnections

IS 6600 :1972 Guide for loading of oilimmersed transformers

IS 8468 :1977Specification for on-load tap-changers