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In a power system, which of the following is/are critical clearance time of a fault related to? 1. Transient reactance 2. Sub-transient reactance 3. Reactive power limit 4. Transient stability limit

In a power system, which of the following is/are critical clearance time of a fault related to? 1. Transient reactance 2. Sub-transient reactance 3. Reactive power limit 4. Transient stability limit Correct Answer 4 only

  • The critical clearance time of a fault is related to maximal fault duration for which the system remains transiently stable.
  • Transient stability means the ability of a power system to experience a sudden change in generation, load, or system characteristics without a prolonged loss of synchronism.
  • To maintain transient stability, a power system fault must be cleared quickly enough so that the fault on transient remains inside the stability boundary.
  • The critical clearing time exceeds, stability is lost by generators using synchronism.

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