Which among the following are suitable for improving the transient stability limits of a power system? i. Increase system voltage by AVR ii. Use high speed excitation systems iii. Use high speed reclosing breakers iv. Increase system frequency
- A. i, ii and iv
- B. i, iii and iv
- C. i, ii, iii and iv
- D. i, ii and iii
Answer: D. i, ii and iii
Explanation: Transient stability limits are improved by fast AVR voltage boost (i), high-speed static excitation systems (ii), and high-speed auto-reclosing circuit breakers (iii).