A triangle connected, round rotor synchronous generator with Xs= 15 Ohm, Ra=0 works in parallel with a network with 400 V interphase voltage and gives only P= 62700 W active power. Find the amplitude of the induced internal electromotive force "Ef" and how many degrees the charge angle is. (It will be assumed that the generator is not overloaded, magnetically linear, no saturation, mechanical losses are neglected, and the armature internal resistance Ra is neglected.) (three digits after the comma
Synchronous Generator
In comparison to an asynchronous generator, it is a machine where the rotor speed is equal to the rotating magnetic field produced by the stator, i.e., mechanical speed is equal to the electrical speed, thus called synchronous, and not asynchronous.
Salient Pole Rotor
Salient pole rotor includes a large number of exposed poles mounted on a magnetic wheel. The construction of a bright pole is as shown in the image on the left. The proposed poles are made of metal laminations. The rotor winding is provided on these poles and is supported by pole shoes.
A triangle connected, round rotor synchronous generator with Xs= 15 Ohm, Ra=0 works in parallel with a network with 400 V interphase voltage and gives only P= 62700 W active power. Find the amplitude of the induced internal electromotive force "Ef" and how many degrees the charge angle is.
(It will be assumed that the generator is not overloaded, magnetically linear, no saturation,
(three digits after the comma.)
Given information about a triangle connected (delta connected) synchronous generator is:
Synchronous reactance Ohm.
Armature resistance is Ohm.
Terminal voltage given Volt (interphase value of voltage or voltage between two phases or line value of voltage).
So the phase value of terminal voltage will be Volt (since triangle connected generator)
Since no information about power factor is given so we are assuming as unity power factor.
Hence power factor is and also we can write .
The active power is given as W.
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