BS 7729:1994 : Specification for Instrument transformers — Three-phase voltage transformers for voltage levels having Um up to 52 kV — (Implementation of CENELEC HD 587 S1)
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This document specifies the requirements and test for new three-phase voltage transformers with Um up to 52 kV frequencies from 15 Hz to 100 Hz , for use with electrical instruments or electrical protective devices.
BS 7729:1994 : Specification for Instrument transformers — Three-phase voltage transformers for voltage levels having Um up to 52 kV — (Implementation of CENELEC HD 587 S1)