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  • BS 5622-1:1979

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    Superseded A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
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    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    Superseded date:  15-03-1996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

    Publisher:  British Standards Institution

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    Table of Contents - (Show below) - (Hide below)

    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

    Abstract - (Show below) - (Hide below)

    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.

    General Product Information - (Show below) - (Hide below)

    Committee PEL/99
    Document Type Standard
    Publisher British Standards Institution
    Status Superseded
    Superseded By

    Standards Referenced By This Book - (Show below) - (Hide below)

    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 Um 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

    Standards Referencing This Book - (Show below) - (Hide below)

    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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