Compared between three_ phase induction generator and synchronous them at impedance field and EMF induced?
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- Sketch the complete per-phase equivalent circuit of a symmetrical non-salient pole three-phase synchronous generator, including the field winding circuit. Your figure should include the synchronous reactance Xs, explain its relation to Xar and Xl. In addition, explain/describe the rest of the different elements of this equivalent circuit.Two alternators rated 400 MW and 600 MW are operating in parallel. The droopcharacteristics of their governors are 3% and 4% respectively from no loadto full load. Assuming that the alternators are operating at 50 Hz at noload, how would a load of 1000 MW be shared between them? What will be thesystem frequency at this load?State True or false a- The DC load flow study is a linear analysis b- In a load frequency control, a generator unit equipped with a governor can be assumed to be a controlled unit.
- What are FACTS (Flexible Alternating Current Transmission Systems), and how do they enhance power system performance and control?The one-line diagram of a simple power system is shown in Figure below. The neutral of each generator is grounded through a current-limiting reactor of 0.25/3 per unit on a 100-MVA base. The system data expressed in per unit on a common 100-MVA base is tabulated below. The generators are running on no-load at their rated voltage and rated frequency with their emfs in phase. G Stark Item Base MVA Voltage Rating X' x² 20 kV 20 kV 20/220 kV 20/220 kV 100 0.05 0.15 0.15 0.10 0.10 220 kV 0.125 0.125 0.30 0.15 0.25 025 0.7125 0.15 100 100 0.15 0.05 0.10 0.10 0.10 100 0.10 100 100 Lu La 220 kV 0.15 220 kV 0.35 100 A balanced three-phase fault at bus 3 through a fault impedance Zf= jo.I per unit. The magnitude of the fault current in amperes in phase b for this fault is: Select one: A. 345.3 B. 820.1 C. 312500 3888888 产产Discuss about Generator modeling in transient stability and derive the formula for the real and reactive power supplied by it.
- Derive current, active and reactive power equations of a three-phase synchronous generator along with phasor diagram.Q) A P-Pole three-phase induction machine with spatial distribution of stator windings is assumed to be sinusoidal A) It is desirable to express the Xs (0m) function for each phase in terms of conductor/radian B) It is desirable to calculate Tag(t,Oe), each phaseLoad characteristic of DC generator is a graph between Il and Vt. True or False
- in distribution transformers; What is 30 degrees phase shift in delta-star connection? What are the disadvantages? (can you explain with drawing?)7. Find the generated line-to-line emf in volts in the armature of a 4 pole, 60 Hz, wye-connected 3-phase generator having flux/pole of 0.15 Wb sinusoidally distributed, 4 slots per pole per phase and 4 conductors/slot. The armature winding is double layer with a coil span of 150 electrical degrees. b. 2,210.4 c. 1,928.6 d. 2,047.5 a. 2,123.8What is the significance of load flow analysis in power systems, and how is it performed?