• BS 7494-1:1991

    Current The latest, up-to-date edition.

    PERFORMANCE AND TESTING OF TELEPROTECTION EQUIPMENT OF POWER SYSTEMS - SPECIFICATION FOR NARROW-BAND COMMAND SYSTEMS

    Available format(s):  Hardcopy, PDF

    Language(s):  English

    Published date:  01-01-1991

    Publisher:  British Standards Institution

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

    Committees responsible
    Foreword
    Section One - General
    1. Scope
    2. Object
    3. Service conditions
    3.1 Ambient conditions
    3.2 Supply voltage with battery operation
    3.3 Supply voltage with a.c. mains operation
    3.4 Storage conditions
    4. Telecommunication circuit used
    Section Two - Terminology
    5. Terminology
    Section Three - Definitions of teleprotection systems
    6. General
    7. Types of teleprotection schemes
    8. Overall operating time of teleprotection systems
         (telecommunication circuit included)
    9. Transmission time (telecommunication circuit
         excluded)
    10. Security
    11. Dependability
    12. Nominal frequency band
    13. Nominal impedance
    14. Guard - Command signals
    15. Levels of guard signals
    16. Levels of command signals
    Section Four - Requirements
    17. General equipment interface requirements
    17.1 Insulation
    17.2 Impulse withstand level
    17.3 High-frequency disturbance level
    18. Specific power supply requirements
    18.1 Power supply variations
    18.2 Interruptions
    18.3 Reflected noise
    18.4 Reverse polarity
    19. Requirements for the teleprotection system
         performance
    19.1 Interrelationship of requirements
    19.2 Monitoring and alarms
    Section Five - Methods for performance testing
    20. General equipment interface tests
    20.1 Insulation
    20.2 Impulse withstand level
    20.3 High-frequency disturbance level
    21. Specific power supply tests
    21.1 Power supply variations
    21.2 Interruptions
    21.3 Reflected noise
    21.4 Reverse polarity
    22. Teleprotection system performance tests
    22.1 Security
    22.2 Dependability
    22.3 Transmission time
    22.4 Interference by discrete frequencies
    22.5 Interference by frequency deviation
    22.6 Checking alarm functions
    22.7 Multicommand equipment
    22.8 Additional tests
    Appendices
    A. Supplement to Clause 22: Teleprotection system
         performance tests
    B. Bibliography
    Z. (untitled)
    Figures

    Abstract - (Show below) - (Hide below)

    Describes multi-signal and narrow-band single-signal equipment for teleprotection. Also applicable to voice frequency equipment which is used in connection with various systems of telecommunications such as radio link, power line carrier (PLC), rented circuits, leased or owned cables. Narrow-band systems include audio frequency systems operating within a 4 kHz maximum band, and PLC channels within a maximum of 4 kHz bandwidth. Covers service conditions, telecommunication circuit used, terminology, definitions of teleprotection systems, requirements and methods for performance testing.

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

    Committee PEL/57
    Development Note Supersedes 89/33073 DC (10/2005) Reviewed and confirmed by BSI, December 2009. (11/2009)
    Document Type Standard
    Publisher British Standards Institution
    Status Current

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

    BS EN 60495:1994 SINGLE SIDEBAND POWER LINE CARRIER TERMINALS
    BS 7602:1992 GUIDE TO GENERAL CONSIDERATIONS FOR TELECOMMUNICATION SERVICES FOR ELECTRICAL POWER SYSTEMS

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

    IEC TR 60663:1980 Planning of (single-sideband) power line carrier systems
    BS 5992-3:1980 ELECTRICAL RELAYS - SPECIFICATION FOR THE INSULATION TESTING OF ELECTRICAL RELAYS
    IEC 60255-5:2000 Electrical Relays - Part 5: Insulation coordination for measuring relays and protection equipment - Requirements and tests
    IEC 60495:1993 Single sideband power-line carrier terminals
    IEC 60050-448:1995 International Electrotechnical Vocabulary (IEV) - Part 448: Power system protection
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