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IEEE Standard Requirements for Liquid-Immersed Distribution Substation Transformers
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.
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:
It is not intended that this standard apply to dry-type, regulating, pad-mounted, secondary-network, furnace, rectifier, mobile, railway, or mine transformers.
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