BS 7494-2:1993
Current
The latest, up-to-date edition.
Performance and testing of teleprotection equipment of power systems Analogue comparison system
Hardcopy , PDF
English
10-15-1993
Committees responsible
National foreword
Section 1. General
1.1 Scope and object
1.2 Normative references
1.3 Service conditions
1.4 Telecommunication system used
Section 2. Terminology
Section 3. Characteristic of analogue comparison tele-
protection schemes
3.1 Arrangement of teleprotection schemes and their
associated interfaces
3.2 Teleprotection operating time (TA or To)
3.3 Protection operating time (TB or Tp)
Section 4. Requirements
4.1 General equipment interface requirements
4.2 Specific power supply requirements
4.3 Operational requirements
Section 5. Methods for performance testing
5.1 General equipment interface tests
5.2 Specific power supply tests
5.3 Teleprotection system performance tests
5.4 Checking alarm functions
Annexes
A. (informative) Types of analogue comparison
protection systems and associated teleprotection
schemes
B. (informative) The binary symmetric channel (BSC)
model
C. (informative) Bibliography
Figures
1. Arrangement of analogue comparison protection
system
2. Typical operating times for analogue comparison
protection systems
3. Parameters for overall teleprotection channel tests
and recommended setting values of the protection
4. Estimated examples of probability of missing command
versus signal-to-noise for a typical phase
comparison protection
5. Test set-up for dependability measurement analogue
teleprotection channel
6. Test set-up for security measurement (analogue
teleprotection channel)
7. Test set-up for dependability measurement (digital
teleprotection channel)
8. Test set-up for security measurement (digital tele-
protection channel)
9. Estimated example of probability of unwanted
commands versus signal-to-noise for a typical phase
comparison protection
10. Estimated example of probability of unwanted
commands versus BER for a typical current
differential protection on a digital teleprotection
channel
A.1 General view of analogue schemes
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