BS 7729:1994
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
Specification for instrument transformers. Three-phase voltage transformers for voltage levels having Um up to 52 kV
Hardcopy , PDF
05-30-2008
English
04-15-1994
Committees responsible
National foreword
Foreword
CHAPTER I: General requirements applicable to all
three-phase voltage transformers
Section One - General
1. Scope
2. General
3. Service conditions
4. Definitions
Section Two - Rating and performance requirements
applicable to all three-phase voltage transformers
5. Standard values of rated voltage
6. Standard values of rated output
7. Standard values of rated voltage factor
8. Limits of temperature rise
9. Insulation requirements
9a. Short-circuit withstand capability
Section Three - Tests: General
10. Classification of tests
Section Four - Type tests
11. Temperature-rise tests
12. Short-circuit withstand capability test
13. Impulse tests on primary winding
14. Wet test for outdoor type transformers
Section Five - Routine tests
15. Verification of terminal markings
16. Power-frequency tests on primary windings
16a. Measurement of partial discharges
17. Power-frequency tests between sections and on
secondary windings
Section Six - Special tests
18. Void
Section Seven - Marking
19. Rating plate markings
Section Eight - Terminal markings
20. General
21. Markings
CHAPTER II: General requirements for three-phase
measuring voltage transformers
Section Nine - General
22. Scope
23. Definitions
Section Ten - Accuracy requirements
24. Accuracy class designation
25. Limits of voltage error and phase displacement
Section Eleven - Tests for accuracy
26. Type tests
26a. Routine tests
Section Twelve - Marking
27. Marking of the rating plate of a measuring voltage
transformer
CHAPTER III: Additional requirements for three-phase
protective voltage transformers
Section Thirteen - General
28. Scope
29. Definitions
Section Fourteen - Accuracy requirements
30. Accuracy class designation
31. Limits of voltage and phase displacement
Section Fifteen - Requirements for secondary windings
intended to produce a residual voltage
32. Rated secondary voltages
33. Rated output
34. Accuracy class
Section Sixteen - Tests for accuracy
35. Type tests
36. Routine tests
Section Seventeen - Marking
37. Marking of the rating plate of a three-phase
protective voltage transformer
Figures
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