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a salient pole 60 Hz synchronous motor with a squirrel cage winding on the rotor which is used for starting purposes.
(a) What is the frequency of the current in the squirrel cage rotor conductors immediately after the motor is energized? (The motor was initially at standstill.)
(b) What is the frequency of the current in the squirrel cage rotor conductors after the field is energized and the machine is operating at steady state?
(c) Assume the machine is initially at steady state operating at rated voltage and unloaded, when a three-phase short circuit occurs on the terminals of the machine. If you could monitor the current in the squirrel cage conductors, what would you expect to see? Explain.
(d) The equal area criteria to determine if a synchronous machine will remain "stable" after a disturbance is essentially an application of the principle of conservation of energy. Very briefly describe how this process can be used to describe the response of the machine to a particular transient.
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a. Neglecting resistance, determine the synchronous, transient and sub-transient reactances. b.If the machine is delivering 1.0 p.u. current at 0.8 power factor lagging at the rated terminal voltage when the short circuit is applied.
A 5-MVA, 66:13.2kV, three-phase transformer supplies a three-phase resistive load of 4,500kW at 13.2kV. What is the load resistance in ohms as measured from the line-to-neutral on the high-voltage side of the transformer, if it is connected in Y-Y..
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A synchronous motor exited by 5 kV source has a synchronous reactance of 5 ohm .The motor is running without any mechanical load(the output real power is zero). Ignore all losses and calculate thr equavelent field voltage Ef that delivers 3 M VAr ..
Your cousine has just bought a used car for $600. He is to pay for it as follows. A $ 2,000 down payment and 24 end of months payments of $ 177.28. What nominal annual intereste rate is being paid what is the actual interest rate
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