BS 171-4:1978
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
Power transformers Specification for tappings and connections
Hardcopy , PDF
07-23-2013
English
08-31-1978
National foreword
Cooperating organizations
Section one - Tappings
Clause
1 Scope
2 Requirements valid for all categories of voltage
variation
2.1 General
2.2 Principal tapping
2.3 Specification of the tapping range
2.4 Short-circuit impedance specification
2.5 Load loss requirements
2.6 Requirements related to temperature rise
(guarantees and tests)
2.7 Requirements related to operation at a voltage
higher than the tapping voltage
3 Definition and additional requirements for constant
flux voltage variation
3.1 Definition of constant flux voltage variation
(C.F.V.V.)
3.2 Additional requirements for constant flux voltage
variation (C.F.V.V.)
3.3 Separate winding transformers of rated power up to
and including 3 150 kVA and a tapping range up to
and including + or - 5%
4 Definition and additional requirements for variable
flux voltage variation
4.1 Definition of variable flux voltage variation
(V.F.V.V.)
4.2 Additional requirements for variable flux voltage
variation (V.F.V.V.)
5 Definition and additional requirements for combined
voltage variation
5.1 Definition of combined voltage variation (Cb.V.V.)
5.2 Additional requirements for combined voltage
variation (Cb.V.V.)
Section two - Connections
6 Connections of phase windings
7 Phase displacement between windings
Appendix A Examples of specifications for transformers
with tappings
Appendix B Transformer connections in general use
Figures
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