3 phase 5 kVA, 200V, 50Hz, star connected, 2 pole (2p = 2) round rotor synchronous machine has 1.5Ω synchronous reactance. (Internal resistance is negligible Ra = 0)) For the generator status; a) Draw the equivalent circuit b) Calculate the nominal current c) Calculate the excitation voltage at full load for Cos = 0.9 (inductive). d) Draw the phasor diagram and calculate the corresponding angles (ϕ, β, ψ)
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.
3 phase 5 kVA, 200V, 50Hz, star connected, 2 pole (2p = 2) round rotor synchronous machine has 1.5Ω synchronous reactance. (Internal resistance is negligible Ra = 0))
For the generator status;
a) Draw the equivalent circuit
b) Calculate the nominal current
c) Calculate the excitation voltage at full load for Cos = 0.9 (inductive).
d) Draw the phasor diagram and calculate the corresponding angles (ϕ, β, ψ)
For motor condition;
e) Draw the equivalent circuit.
f) Calculate the excitation voltage at full load for Cos ϕ = 0.9 (inductive).
g) Draw the phasor diagram and calculate the corresponding angles (ϕ, β, ψ)
h) Calculate the maximum power and torque that the motor can provide.
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