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

Question

Question

This question was previously asked in

ESE Electrical 2014 Paper 2: Official Paper

Attempt Online

Answer 1

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.