1.The system consumes 150KW, 208V line to line at 0.8 lagging power factor from parallel generator that supply a pure resistive balance load 0.01 ohm. A) determine the total armature resistance of parallel generator B) determine the total synchronous reactance of parallel generator
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- synchronous generator threewThe phases are rated at 1000 kVA and operate at a voltage of 6.6 kV. The product resistance per phase is 0.38 ohms and the leakage reactance is 0.5 ohms per phase. The generator works to provide full load at a power factor of 0.85 delayed and at normal voltages. Find the value of the no-load voltage.two alternators A and B having 5% speed regulation are working in parallel at a station. Alternator A is rated at 15 MW while B is at 20 MW. When the total load to be shared is 12 MW, then how much of the load will be shared by the alternator B?2.) A 60-MVA, 69.3 kV, 3-phase synchronous generator has a synchronous reactance of 15 ohms per phase and negligible resistance. The generator is delivering rated power at 0.8 pf leading at rated terminal voltage to an infinite bus bar. Determine the magnitude of the power angle. Subject Electrical machine 2
- 6. A 3 phase fault occurs at point F as shown in figure. Determine the critical clearing anglefor the system. The generator is delivering 1.0 p.u power under prefault conditioThe 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To improve power factor by static capacitor method. If the capacitance per phase is increases, then current taking from supply is Does not change Increases O Doubled O Decreases In synchronous condenser method to increase power factor, synchronous motor is act as capacitive (Capacitor) nature at O No load, rated excitation condition. Full load under excitation condition O No load, under excitation condition. No load, over excitation condition. 0S の ENG 10/C
- Two turbo alternators rated for 140 MW and 260 MW have gov ernor drop characteristics of 5% from no load to full load. They are connected in parallel to share a load of 250 MW. Determine the load shared by each machine suming free governing action.Two shunt generators A and B operate in parallel and their load characteristics maybe taken as straight lines. The voltage falls from 240V at no load to 200V at200A, while that of B falls from 245V at no load to 220V at 150A. Determine the bus bar voltage when supplying 66.9KW load. How is the load divided between two generators?Sheet no.5 Q1)two dc shunt generators operating in parallel supply a total load current of (200 A ). The terminal voltage of one generator falls uniformly from ( 240 V) to ( 225 V) when delivering (120A) The terminal voltage of the second generator falls uniformly from (230V) to (215 V ) when delivering (100 A). find the load current shared by each generator and the bus-bars voltage ? U chunt generators running in parallel supply a total load
- Discussion : 1- What are the advantages and disadvantages of this test ? 2- Why it's imporctical carry out actual load test on large rating transformers ? 3- What will be the current in the primary windings? i) When secondaries are not loaded ? ii) When secondaries are loaded ?2- Why it's imporctical carry out actual load test on large rating transformers ?3- What will be the current in the primary windings?i) When secondaries are not loaded ?ii) When secondaries are loaded ?A synchronous generator is connected through a transformer and a transmission line to synchronous motor. The rated voltage and apparent power of the generator serve as the base quantities for this power system. On the system base, the per-unit sub transient reactance of the generator and the motor are 0.15 and 0.40 respectively, the series reactance of the transformer is 0.10, and the series reactance of the transmission line is 0.20. All resistances may be ignored. The generator is supplying rated apparent power and voltage at a power factor of 0.85 lagging when a three-phase synchronous fault occurs at the terminals of the motor. Find the per-unit sub transient current at the fault, in the generator, and in the motor.