The bus impedance matrix for the 3-bus system is: 30.183 j0.078 j0.141 Z- 30.078 j0.148 0.106 j0.141 0.106 o.267 , 30.5 30.56 J0.4 30.35 Spark The line between buses 1 and 3 with impedance Z13 = jo.56 is removed by the simultaneous opening of breakers at both ends of the line. Determine: The term Z,, is: Select one: A jo.50 B. jo.078 OC. j2.00 O D. JO.075

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Synchronous Motor

The synchronous motor is an AC electric type motor where at a steady-state the shaft rotation is synchronized with the supply current variable-frequency. To an integral number of AC cycles, the rotation period is exactly equal. The stator of the motor in the synchronous motor contains multi-phase AC electromagnets due to which a magnetic field is created that rotates in time with the oscillation of the line current. The rotor contains a permanent magnet and the rotor rotates in synchronization with the stator field at the same rate and provides the second synchronized magnetic field which is rotating in nature as a result. When the synchronous motor is supplied with independently excited multi-phase AC electromagnets on both the rotor and the stator, it is termed as a doubly-fed machine. The most widely used AC-type motors are the synchronous AC motor and the induction AC motors.