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; - instrument transformers (covered by IEC Publication 185 and 186); - transformers for static convertors (covered by IEC Publications 84, 119 and 146); - starting transformers; - testing transformers; - traction transformers mounted on rolling stock; - flameproof and mining trannsformers; - welding transformers; - voltage regulating transformers; - small power transformers in which safety is a special consideration. Where Netherlands 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.