申論題

5.A three-phase, 60-Hz, 250-MVA, 13.8-kV, generating unit has an H constant of 4.0 p.u.-s. The mechanical power supplied by prime mover and electrical power output of the generator in p.u. are p_m and p_e, respectively. Initially, this unit is operating synchronously at p_m =p_e =2.0 with power angle δ=10°.