A 300k W, 6600- v, eight poles, 60 Hz, three phase Y-connected synchronous motor has a synchronous reactance of 88 2, and negligible armature resistance. All losses are neglected. a) Calculate the induced torque in the motor when the motor is set to operate at rated power and unity power factor. Draw a phasor diagram for this condition. b) If the mechanical load is now removed and the field current is unchanged calculate the value of reactive power of the motor. Draw a phasor diagram for this condition.

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KVL and KCL

KVL stands for Kirchhoff voltage law. KVL states that the total voltage drops around the loop in any closed electric circuit is equal to the sum of total voltage drop in the same closed loop.

Sign Convention

Science and technology incorporate some ideas and techniques of their own to understand a system skilfully and easily. These techniques are called conventions. For example: Sign conventions of mirrors are used to understand the phenomenon of reflection and refraction in an easier way.