8.2 Three motors rated 6.9 ky are connected to the same bus. The motors are: No. 1: 5,000-hp, 0.8-p.f. synchronous motor, X" 17% No. 2: 3,000-hp, 1.0-p.f. synchronous motor, X" = 15% No. 3: 3,500-hp, induction motor, X" 20% Express the subtransient reactances of these motors in per unit on a base of 10,000 kva, 6.6 kv.

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Stator and Rotor Magnetic Field

The stator and rotor magnetic field is the resulting magnetic field generated by a system of coils that are symmetrically aligned. They are supplied with polyphase currents. The magnetic field is generated by poly-phase (two or more phases) current or single-phase current. In the latter case, two field stator windings are supplied and two resulting electromagnetic fields are generated beyond the stage.