August 2015
Beginner to intermediate
1061 pages
31h 28m
English
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Appendix C
Standard Device Numbers Used in Protection Systems
Some of the frequently used device numbers are listed in the following. A complete list and definitions are given in ANSI/IEEE Standard C37.2-1079.
- 1. Master element: normally used for hand-operated devices
- 2. Time-delay starting or closing relay
- 3. Checking or interlocking relay
- 4. Master contactor
- 5. Stopping device
- 6. Starting circuit breaker
- 7. Anode circuit breaker
- 8. Control power disconnecting device
- 9. Reversing device
- 10. Unit sequence switch
- 12. Synchronous-speed device
- 14. Underspeed device
- 15. Speed- or frequency-matching device
- 17. Shunting or discharge switch
- 18. Accelerating or decelerating device
- 20. Electrically operated valve
- 21. Distance relay
- 23. Temperature control ...
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