scope:

This standard applies to dry-type power transformers (including auto-transformers) having values of highest voltage for equipment up to and including 36 kV. The following small and special dry-type transformers are not covered by this standard: - Single-phase transformers rated at less than 1 kVA and polyphase transformers rated at less than 5 kVA; - transformers having no windings with rated voltage Ur higher than 1000 V; - instrument transformers; transformers for static convertors; starting transformers; testing transformers; traction transformers mounted on rolling stock; welding transformers; voltage regulating transformers and small power transformers in which safety is a special consideration. With the publication of this standard, the requirements of IEC Publication 76 apply to dry-type transformers only in so far as they are referred to in this standard. Where reference is made to specific clauses and sub-clauses of various parts of IEC Publication 76, it is to be understood that the editions are as follows: 76-2, 76-2, 76-4, 76-5:1976. 76-3:1980. NOTE Where IEC standards do not exist for the transformers mentioned above or for other special transformers, this standard may be applicable as a whole or in parts.