IS 3637 : 1966 Gas operated relays

1 Scope

1.1 This standard covers requirements and methods of test forgas-operated relays intended for installation in the connectingpassage of oil between the main tank of an oil immersed electricalapparatus and its oil conservator vessel.

1.2 This standard covers gas-operated relays fitted with bothalarm and trip elements.

1.3 Although this standard does not specifically excludegas-operated relays intended only for alarm, special provisionsintended only for suck relays have not been included.

1.4 This standard does not cover gas-operated relays which arenot intended to be installed in the oil passage between the maintank and the conservator. It also does not cover gas-operatedrelays used for the protection of oil immersed apparatus mounted onrailway vehicles.

2 References

IS 2 :1960Rules for rounding off numerical values

IS 554 :1964Dimensions for pipe threads for gas list tubesand pressure tight screwed fittings

IS 1885 : Part IX :1956 Electrotechnical vocabulary :Part IX Electrical relays

IS 2026 : 1962 Specification forpower transformers

IS 3639 :1966Specification for fittings and accessories forpower transformers