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This Standard describes electrical and mechanical requirements of single-phase Station Service Voltage Transformers with voltages of 34.5 kV or higher in the highest voltage winding.

This standard is a basis for the establishment of performance and limited electrical and mechanical interchangeability requirements of the equipment are described. It is also a basis for assistance in the proper selection of such equipment.

A station service voltage transformer (SSVT) is a single-phase transformer to be connected line-to-earth on an effectively earthed system. It can be used either as an individual unit for supplying single-phase loads, or in a three-phase bank to support three-phase loads. A typical application is to supply substation power such as lighting, pump and motor loads. The SSVT is provided with a measuring winding when requested by the user.