BS 7821-2.1:1995 Three phase oil-immersed distribution transformers, 50 Hz, from 50 to 2500 kVA with highest voltage for equipment not exceeding 36 kV. Part 2. Distribution transformers with cable boxes on the high voltage and/or low voltage side - Part 2.1 General requirements
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HD 428.1 subclause 3.3 states that a distribution transformer could have different termination features.
The following constructional situations are possible:-
i) Termination in open type (oil-air) bushings without protection. This is covered by HD 428.1, HD 428.3, HD 506, HD 596 and HD 607.
ii) Termination in plug-in type bushings of inside or outside cone type. This is
covered by HD 428.1, HD 428.3 and HD 506.
iii) Termination in air filled or oil/compound filled cable boxes or protective enclosure
using open type and/or oil-oil bushings, as defined in HD 428.2.2.
iv) Flange boxes and similar solutions using open type bushings can also be used.
This document covers, in conjunction with HD 428.1, distribution transformers under iii)and iv) above, up to 24 kV. An annex may in the future be issued to cover 36 kV.Further documents exist which may be used by agreement between purchaser andmanufacturer for cable boxes and enclosures. The dimensional requirements for cableboxes and protective enclosures are not included in this document.Unless otherwise stated in this document, HD 428.1 shall be applied.
BS 7821-2.1:1995 Three phase oil-immersed distribution transformers, 50 Hz, from 50 to 2500 kVA with highest voltage for equipment not exceeding 36 kV. Part 2. Distribution transformers with cable boxes on the high voltage and/or low voltage side - Part 2.1 General requirements