IEEE C57.12.36-2026

This standard covers certain electrical, dimensional, and mechanical characteristics of 50 Hz and 60 Hz, two winding, liquid-immersed distribution substation transformers. Such transformers may be remotely or integrally associated with either primary and secondary switchgear or substations, or both, for step-down or step-up purposes rated as follows: a) 112.5 kVA through 10 000 kVA three-phase; b) 250 kVA through 6667 kVA single-phase; c) High voltage 69 000 V and below, and low voltage 34 500 V and below. It is not intended that this standard apply to dry-type, regulating, pad-mounted, secondary-network, furnace, rectifier, mobile, railway, or mine transformers.



Revision Standard - Active. The small power transformer that is applied as more than just a limited-scope version of the power transformers covered by IEEE Std C57.12.10™ and as more than a large distribution-class transformer covered by IEEE Std C57.12.34™ is defined in this standard.