題組內容

4. The inertia constant (H) of a three-phase 60-Hz generator is 1.5 p.u.-s. The electrical power delivery by the generator (Pe) versus its power angle (δ ) can be expressed as eq. (2). The mechanical power input to the generator ( Pm) is 0.5 p.u. (25%)

 Pe=1.2319sin(δ) 

(b) Calculate the critical clearing time for the generator when a three-phase bolted short-circuit at the generator terminals causes Pe =0. (15%)