BS 7452:1991
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
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Specification for separating transformers, autotransformers, variable transformers and reactors
Hardcopy , PDF
31-08-2014
English
31-07-1991
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Committees responsible
National foreword
General plan of the standard
Chapter I: General requirements
1. Scope and object
2. Definitions
3. General requirements
4. General notes on tests
5. Rating
6. Classification
7. Marking
8. Protection against electric shock
9. Change of input voltage setting
10. Output voltage and output current under load
11. No-load output voltage
12. Short-circuit voltage
13. Heating
14. Short-circuit and overload protection
15. Mechanical strength
16. Protection against harmful ingress of water and
moisture
17. Insulation resistance and electric strength
18. Construction
19. Components
20. Internal wiring
21. Supply connection and external flexible cables and
cords
22. Terminals for external conductors
23. Provision for protective earthing
24. Screws and connections
25. Creepage distances and clearances
26. Resistance to heat, abnormal heat, fire and
tracking
27. Resistance to rusting
Appendix I-A Production tests
Appendix I-B Void
Appendix I-C Examples of points of application of test
voltages
Appendix I-D Measurement of creepage distances and
clearances
Appendix I-E Examples of points of measurement of
creepage distances and clearances
Chapter II: Particular requirements for special
separating transformers
Section 1. Control transformers
1. Scope and object
2. Definitions
7. Marking
9. Change of input voltage setting
10. Output voltage and output current under load
11. No-load output voltage
13. Heating
17. Insulation resistance and electric strength
25. Creepage distances and clearances
Section 2. Ignition transformers for gas and oil burners
1. Scope and object
2. Definitions
4. General notes on tests
5. Rating
6. Classification
7. Marking
8. Protection against electric shock
10. Output voltage and output current under load
11. No-load output voltage
13. Heating
14. Short-circuit and overload protection
16. Protection against harmful ingress of water and
moisture
17. Insulation resistance and electric strength
18. Construction
25. Creepage distances and clearances
Appendix II-A Void
Appendix II-B Measurement of leakage current for
ignition transformers for gas and oil burners
Section 3. High insulation level transformers and
separating transformers with working voltage above 1000V
1. Scope and object
2. Definitions
7. Marking
10. Output voltage and output current under load
11. No-load output voltage
17. Insulation resistance and electric strength
25. Creepage distances and clearances
Section 4. Stray field transformers
Under consideration
Section 5. Stabilizing transformers (current and voltage
types)
Under consideration
Chapter III: Particular requirements for auto-
transformers
1. Scope and object
2. Definitions
5. Rating
7. Marking
8. Protection against electric shock
10. Output voltage and output current under load
17. Insulation resistance and electrical strength
25. Creepage and clearance distances
26. Resistance to heat, abnormal heat, fire and
tracking
Appendix III-A Production tests
Chapter IV: Supplementary specifications for variable
transformers
1. Scope and object
2. Definitions
6. Classification
7. Marking
8. Protection against electric shock
10. Output voltage and output current under load
11. No-load output voltage
13. Heating
15. Mechanical strength
18. Construction
21. Supply connection and external flexible cables and
cords
25. Creepage distances and clearances
Appendix IV-A Tests during production
Chapter V: Supplementary particular requirements for
reactors
Under consideration
Figures
Single-phase or polyphase air-cooled separating transformers, auto-transformers, variable transformers and small reactors having a supply voltage not exceeding 1000 V a.c. and rated frequency not exceeding 500 Hz.
| Committee |
PEL/96
|
| DevelopmentNote |
Also numbered as IEC 60989 Supersedes 84/28673 DC (10/2005)
|
| DocumentType |
Standard
|
| Pages |
132
|
| PublisherName |
British Standards Institution
|
| Status |
Superseded
|
| SupersededBy |
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| BS 3939-6:1985 | Graphical symbols for electrical power, telecommunications and electronics diagrams Production and conversion of electrical energy |
| BS 3535-1:1990 | Isolating transformers and safety isolating transformers General requirements |
| BS 88-2.1:1988 | Cartridge fuses for voltages up to and including 1000 V a.c. and 1500 V d.c. Specification for fuses for use by authorized persons (mainly for industrial application). Additional requirements for fuses with fuse-links for bolted connections |
| PD 6499:1981 | Guide to insulation co-ordination within low-voltage systems including clearances and creepage distances for equipment |
| BS 171-4:1978 | Power transformers Specification for tappings and connections |
| HD 384.5.51 : 200S2 | ELECTRICAL INSTALLATION OF BUILDINGS - PART 5: SELECTION AND ERECTION OF ELECTRICAL EQUIPMENT - CHAPTER 51: COMMON RULES |
| BS 1362:1973 | Specification for general purpose fuse links for domestic and similar purposes (primarily for use in plugs) |
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