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Chapter 13. Power System Protection

Chapter 13. Power System Protection. Not that “system” is a misnomer, should say component protection. Guiding principle (for traditional protection)

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Chapter 13. Power System Protection

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  1. Chapter 13. Power System Protection • Not that “system” is a misnomer, should say component protection. • Guiding principle (for traditional protection) • Coordinate the relay settings to minimize the loss of load, while ensuring (with a very high probability) that major damage to equipment will not result.

  2. Now suppose that we need to add time delays. Design the time delays

  3. A very simple control diagram. Real ones are much more interesting.

  4. Compute the fault currents at (x) and (y) for 3LG fault. How would you set OC relays to clear faults correctly?

  5. ANSI device numbers

  6. What if our system is meshed?

  7. Distance relays and zones of protection

  8. Modified impedance relays

  9. 13.5 Differential protection

  10. Operating region...

  11. 13.6 Differential protection of transformers

  12. Y-Delta transformers

  13. Additional concepts • Pilot relaying • DUTT • POTT • Transmission line differential relaying • System protection (Special Protection) • Substation configuration. Breaker failure • Single breaker, Breaker and a half, Double breaker • Ring bus, transfer bus.

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