The given variable losses are 5kW fr a 500 KVA, 11 kV, 3-phase star connected alternator having armature resistance of 4 ohms. Calculate the current at which maximum efficiency occurs?

Efficiency and Regulation topics include: Power flow through an inductive impedance, losses and efficiency of synchronous machines. In electrical engineering, voltage regulation is a measure of change in the voltage magnitude between the sending and receiving end of a component. Regulation is the change in voltage that occurs when a load is connected across a power supply, caused by internal resistance or impedance.  Electrical machines are designed to have an efficiency of over 90%. Large electrical machines can have an efficiency of 95–99%. Most electric motors are designed to run at... Show more

Efficiency and Regulation topics include: Power flow through an inductive impedance, losses and efficiency of synchronous machines.

In electrical engineering, voltage regulation is a measure of change in the voltage magnitude between the sending and receiving end of a component. Regulation is the change in voltage that occurs when a load is connected across a power supply, caused by internal resistance or impedance. 

Electrical machines are designed to have an efficiency of over 90%. Large electrical machines can have an efficiency of 95–99%.
Most electric motors are designed to run at 50–100% of rated load, with maximum efficiency usually near 75% of rated load. 
Electrical machines with high-coercivity rare-earth permanent magnets are potentially the most compact and energy efficient. 

Voltage regulation in electrical machines is the ability of a machine to maintain a relatively constant output voltage despite changes in the input. 

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