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BS 5622-1:1979

Superseded
Superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

View Superseded by
superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

Guide for insulation co-ordination Terms, definitions, principles and rules
Available format(s)

Hardcopy , PDF

Superseded date

15-03-1996

Language(s)

English

Published date

31-01-1979

Foreword
Cooperating organizations
Chapter I: General considerations
Section one - Scope and object
1. Scope
2. Object
Section two - Definitions
3. Nominal voltage of a three-phase system
4. Highest voltage of a three-phase system
5. Highest voltage for equipment
6. External insulation
7. Internal insulation
8. Indoor external insulation
9. Outdoor external insulation
10. Self-restoring insulation
11. Non-self-restoring insulation
12. Type test
13. Routine test
14. Isolated neutral system
15. Resonant earthed system (system earthed through
     an arc-suppression coil)
16. Earthed neutral system
17. Earth fault factor
18. Overvoltage
19. Phase-to-earth per unit overvoltage (p.u.)
20. Phase-to-phase per unit overvoltage (p.u.)
21. Switching overvoltage
22. Lightning overvoltage
23. Statistical switching (lightning) overvoltage
24. Conventional maximum switching (lightning) over-
     voltage
25. Temporary overvoltage
26. Statistical switching (lightning) impulse withstand
     voltage
27. Conventional switching (lightning) impulse
     withstand voltage
28. Rated switching (lightning) impulse withstand
     voltage
29. Rated short duration power-frequency withstand
     voltage
30. Rated insulation level
31. Statistical safety factor
32. Conventional safety factor
33. Protection level of a protective device
34. Protection factors of a protective device
Section three - Basic principles of insulation
co-ordination
35. Insulation co-ordination
36. Voltage stresses and other factors affecting
     insulation
37. Ranges of highest voltages for equipment
38. Delectric tests
38.1 Types of dielectric tests
38.2 Selection of the dielectric tests
39. Co-ordination for voltages under normal operating
     conditions and for temporary overvoltages
40. Co-ordination for switching and lightning over-
     voltages
40.1 Choice of the procedure
40.2 Statistical procedure
40.3 Conventional procedure
Chapter II: Standard insulation levels for equipment in
Range A
41. General indications
42. Tables of standard insulation levels
Chapter III: Standard insulation levels for equipment in
Range B
43. General indications
44. Table of standard insulation levels
45. Choice of the insulation level
Chapter IV: Standard insulation levels for equipment in
Range C
46. General indications
47. Table of standard insulation levels for highest
     voltage range for equipment equal to or greater
     than 300 kV
48. Rated switching impulse withstand voltage
49. Rated lightning impulse withstand voltage
Chapter V: General testing procedure
50. General
51. Switching and lightning impulse withstand tests
52. 50% disruptive discharge test
53. Fifteen-impulse withstand test
54. Conventional impulse withstand test
55. Short duration power-frequency voltage withstand
     tests

Definitions, basic principles, standard insulation levels and general testing procedures for equipment for 3-phase a.c. systems having a highest voltage for equipment above 1 kV. Except for some definitions, applies only to phase-to-earth insulation.

Committee
PEL/99
DocumentType
Standard
Pages
24
PublisherName
British Standards Institution
Status
Superseded
SupersededBy

Standards Relationship
IEC 60071-1:1976 Identical

BS 7264-1:1990 Shunt capacitors for a.c. power systems having a rated voltage above 1000 V Specification for performance, testing and use
BS 7729:1994 Specification for instrument transformers. Three-phase voltage transformers for voltage levels having <i>U</i><sub>m</sub> up to 52 kV
BS 6904:1987 Guide for cable connections for gas-insulated metal-enclosed switchgear for rated voltages of 72.5 kV and above
BS EN 60265-2:1994 Specification for high-voltage switches Specification for high-voltage switches. High-voltage switches for rated voltages of 52 kV and above
BS 3297-2:1993 Characteristics of indoor and outdoor post insulators for systems with nominal voltages greater than 1000 V
BS 6581:1985 Specification for common requirements for high-voltage switchgear and controlgear standards
BS 5622-2:1979 Guide for insulation co-ordination Application guide
BS EN 60383-2:1995 Insulators for overhead lines with a nominal voltage above 1000 V Insulator strings and insulator sets for a.c. systems. Definitions, test methods and acceptance criteria
BS 7354:1990 Code of practice for design of high-voltage open-terminal stations
BS 5856-1:1980 Specification for motor starters for voltages above 1 kV a.c. and 1.2 kV d.c. Direct-on-line (full voltage) a.c. starters
BS 3297-2:1982 Post insulators of ceramic material or glass for nominal voltages greater than 1000 V Specification for dimensions
EN 60383-2:1995 Insulators for overhead lines with a nominal voltage above 1 kV - Part 2: Insulator strings and insulator sets for a.c. systems - Definitions, test methods and acceptance criteria
BS 7578:1992 Coupling capacitors and capacitor dividers
BS 5463-1:1991 Specification for high-voltage switches High-voltage switches for rated voltages above 1 kV and less than 52 kV
BS 6435:1984 Specification for unfilled enclosures for the dry termination of HV cables for transformers and reactors
BS 2562:1979 Specification for cable boxes for transformers and reactors

IEC 60060-2:2010 High-voltage test techniques - Part 2: Measuring systems
BS 171-1:1978 Power transformers General
IEC 60076-5:2006 Power transformers - Part 5: Ability to withstand short circuit
BS 5622-2:1979 Guide for insulation co-ordination Application guide
IEC 60076-1:2011 Power transformers - Part 1: General
IEC 60060-3:1976 High-voltage test techniques - Part 3: Measuring devices
IEC 60076-2:2011 Power transformers - Part 2: Temperature rise for liquid-immersed transformers
IEC 60186:1987 Voltage transformers
IEC 60060-4:1977 High-voltage test techniques - Part 4: Application guide for measuring devices
BS 171-2:1978 Power transformers Specification for temperature rise requirements
IEC 60060-1:2010 High-voltage test techniques - Part 1: General definitions and test requirements
IEC 60099-1A:1965 First supplementReplaced by IEC 99-5
BS 171-4:1978 Power transformers Specification for tappings and connections
BS 171-5:1978 Power transformers Specification for ability to withstand short circuit

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