BS 7806:1995
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
View Superseded by
Dry-type power transformers
Hardcopy , PDF
20-08-2003
English
01-10-2002
Important note : Users cannot be edited or removed once added to your Multi user PDF.
National foreword
Foreword
SECTION ONE - GENERAL
1 Scope
2 Service conditions
3 Definitions
4 Tappings
5 Connections
6 Ability to withstand short circuit
SECTION TWO - RATING
7 Rating
8 Rating plates
SECTION THREE - COOLING METHODS AND TEMPERATURE RISE
9 Rating
10 Temperature-rise limits
SECTION FOUR - INSULATION LEVELS
11 Insulation levels
SECTION FIVE - TESTS
12 General requirements for tests
13 Measurement of winding resistance
14 Measurement of voltage ratio and check of voltage
vector relationship
15 Measurement of impedance voltage (principle tapping)
short-circuit impedance and load loss
16 Measurement of no-load loss and current
17 Separate-source voltage withstand test
18 Induced overvoltage withstand test
19 Lightning impulse test
20 Partial discharge measurement
21 Temperature-rise test
22 measurement of sound level
23 Short-circuit test
24 Low temperature test
25 Thermal shock test
26 Tolerances
SECTION SIX - ENCLOSURES AND SAFETY REQUIREMENTS
27 Degrees of protection provided by enclosures
28 Protection against direct contact
29 Earthing terminal
SECTION SEVEN - MISCELLANEOUS
30 Electromagnetic compatibility (EMC)
Appendix A Information required with enquiry and order
Appendix B Environmental, climatic and fire behaviour classes
Annex ZA (normative) Trial use guide for special tests to
prove suitability to environmental classes
Annex ZB (normative) Trial use guide for special tests to
prove suitability to climatic classes
Annex ZC (normative) Trial use guide for special tests to
prove suitability to fire behaviour classes
Annex ZD (informative) Installation and safety of a dry-type
transformer
Figures
Tables
Specifies cooling methods, temperature rise limits, insulation limits, test methods and degrees of protection by enclosures.
| Committee |
PEL/14
|
| DevelopmentNote |
Supersedes 01/206408 DC and 88/20316 DC (10/2002)
|
| DocumentType |
Standard
|
| Pages |
44
|
| PublisherName |
British Standards Institution
|
| Status |
Superseded
|
| SupersededBy | |
| Supersedes |
| Standards | Relationship |
| HD 464 : S1 AMD 5 2002 | Identical |
| BS 7844-2:1996 | Three-phase dry-type distribution transformers 50 Hz, from 100 to 2500 kVA with highest voltage for equipment not exceeding 36 kV Supplementary requirements for transformers with highest voltage for equipment equal to 36 kV |
| IEC 60076-5:2006 | Power transformers - Part 5: Ability to withstand short circuit |
| IEC 60076-3:2013 | Power transformers - Part 3: Insulation levels, dielectric tests and external clearances in air |
| IEC 60529:1989+AMD1:1999+AMD2:2013 CSV | Degrees of protection provided by enclosures (IP Code) |
| IEC 60076-1:2011 | Power transformers - Part 1: General |
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