A three phase, 50 Hz, 4800V, 6 pole Y-connected synchronous generator connected to an infinite bus (constant voltage at 4800V) and has synchronous reactance of 202 per phase and negligible armature resistance. The generator is delivering 1 MW at a power angle of 30° . Calculate the following 1. Output torque of the generator 2. Excitation voltage E. 3. Armature current

In a long shunt DC generator, Shunt winding is parallel with the Series filed winding and Armature winding of the DC generator. Select one: True False

A six-pole, 30-slot dc commutator generator has a lap wound Armature winding. The armature constant, Ka is 9.55.The generator is operated with a separately excited field such that the field flux per pole is 0.04 weber/pole. The generator is driven at a speed of 3000 rpm. The no load armature voltage is 418.9 V. The above generator is now operated as a motor. The flux is 0.04 weber/pole. It is desired to supply a load requiring a Torque of 50 n–m at 4000 rpm. Armature circuit resistance is 0.075 ohm. Calculate (a) the back emf, (b) the required armature current and voltage to supply this load.

A 13.8-kV, 50-MVA, 0.9-power-factor-lagging, 60-Hz, four-pole Y-connected synchronous generator has a synchronous reactance of 2.5 Q and an armature resistance of 0.2 2. At 60 Hz, its friction and windage losses are 1 MW, and its core losses are 1.5 MW. The field circuit has a dc voltage of 120 V, and the maximum Ir is 10 A. The current of the field circuit is adjustable over the range from 0 to 10 A. The OCC of this generator is shown in Figure P4-1. 4.2 Open-circuit characteristic 20 18 (a) How much field current is required to make the terminal voltage V, (or line voltage V,) equal to 13.8 kV when the generator is running at no load? 16 (b) What is the internal generated voltage E, of this machine at rated conditions? 14 12 (c) What is the phase voltage V of this generator at rated conditions? 10 (d) How much field current is required to make the terminal voltage V, equal to 13.8 kV when the generator is running at rated conditions? (e) Suppose that this generator is running at…

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A 15-kV 35-KVA 0.76-PF-lagging 50-Hz four-pole Y-connected steam-turbine generator has a synchronous reactance of 3.50 0 per phase and an armature resistance of 0.75 0 per phase. This generator is operating in parallel with a large power system (infinite bus). a) What is the magnitude of E, at rated conditions? b) What is the generator's torque angle at rated conditions? c) If the field current is constant, what is the maximum power possible out of this generator? How much reserve power or torque does this generator have at full load? d) Sketch the corresponding phasor diagram and calculate for the armature current (assume the field current is still unchanged) e) At the absolute power possible, how much reactive power will this generator be supplying or consuming?

Define the Synchronizing Torque and Damping Torque of a Synchronous Generator using the through explanations and draw the essential curves illustrating the concepts

A 380 V line-to-line, 40 kVA, 50 Hz, 6-pole, Y-connected cylindrical rotor synchronous machine operates as an isolated generator (not connected to a bus). The synchronous reactance is 1 Q/phase and the armature resistance is negligible. The field current of the generator is adjusted so that the no-load terminal voltage is 380 V line-to-line. Calculate the terminal voltage and the voltage regulation if the generator is loaded with (draw the phasor diagram for each case) a. rated current at unity power factor b. rated current at 0.8 lagging power factor C. rated current at 0.8 leading power factor