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PC57.12.34 - Standard for Requirements for Pad-Mounted, Compartmental Type, Self Cooled, Three Phase Distribution Transformers, 10 MVA and Smaller; High Voltage, 34.5kV Nominal System Voltage and Below; Low Voltage, 15kV Nominal System Voltage and Below

This standard is intended for use as a basis for determining performance, interchangeability, and safety of the equipment covered, and to assist in the proper selection of such equipment.This standard covers certain electrical, dimensional, and mechanical characteristics and takes into consideration certain safety features of three-phase, 60 Hz., liquid filled, self-cooled, pad-mounted, compartmental-type distribution transformers. These transformers are rated 10 MVA and smaller, with the high voltage limit of 34.5 kV system nominal voltage and below, and with low voltage limit of 15 kV system nominal voltage and below. These transformers are generally used for step-down or step-up purposes from an underground primary cable supply. This standard covers the connector, bushing and terminal arrangements for radial or loop feed systems as well as certain critical dimensions for these items necessary for proper safety and operational considerations. This standard does not cover the electrical and mechanical requirements of any accessory devices that may be supplied with the transformer.
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