Advantages of stationary armature: Advantages of stationary armature The output current can be led directly from fixed terminals on the stator to the load circuit, without passing through brush-contacts. It is easier to insulate stationary armature winding for high ac voltages, which may have as high a value as 30 kV or more.
H.W: H.W A four pole, three-phase synchronous generator is rated 250 MVA, its terminal voltage is 24 kV, the synchronous reactance is: 125%. • Calculate the synchronous reactance in ohm. • Calculate the rated current and the line to ground terminal voltage. • Draw the equivalent circuit. • Calculate the induced voltage, E f , at rated load and pf = 0.8 lag. ( Ans : X syn =2.88 Ω, I g =6.01∟-36.87 o KA, E gn =27.93∟29.74KV)
Voltage regulation of Alternator: Voltage regulation of Alternator The voltage regulation of an Alternator is defined as the change in terminal voltage from no-load to load condition expressed as per-unit or percentage of terminal voltage at load condition; the speed and excitation conditions remaining same. Voltage regulation=[ (V nl -v fl )/v fl ] *100%