IS 3639 : 1966 Specification for Fittings and Accessories for Power Transformers

1 Scope

1.1 This specification covers This accessories for use withtransformers covered.

a) Valves and valve flanges,

b) Flanges for Bucholz relay,

c) Breather pipe,

d) Thermometer pockets,

e) Level indicator,

f) Rollers, and

g) Earthing terminals.

2 References

IS 2 :1960 Rules for rounding offnumerical values

IS 554 : 1964Dimensions for pipe threads for gas list tubes andpressure tight screwed fittings

IS 1362 : 1962Dimensions for screw threads for general purposes(diameter range 1.6 to 39 mm)

IS 1363 : 1960 Specification for black hexagonalbolts (6 to 39 mm) with nuts and black hexagonal screws (6 to 24mm)

IS 1180 : 1964 Specification for outdoor typethree-phase distributiontransformers up to and including 100 kVA 11 kV

IS 2026 : 1962 Specification for power transformers