Two compound generator A and B fitted with an equalizing bar supply a total load current of 350 A. the data of the machines are. Ra (ohm) 0.02 0.01 Rse (ohm) 0.004 0.002 Generated emf (V) 220 225 Calculate (1) the busbar current and (ii) the terminal voltage Comment on your results
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- Question 3a) The Electricity Company of Ghana (ECG) has noticed two different values of voltagebetween the No-load Voltage and the load Voltage aa the end of one of their distribution feeders. One is 80% and the 4other is 2%. Which of these two values would you recommend to ECG to use and why? b) An Electrical Power Generation Company has engaged you as their consultant for you to advise them on their Synchronous generators. During a peaking load situation which occurred between 5pm to 8pm, the generators experienced transient stability challenges that lead even to some of the generators shutting down. You have been called upon to provide five (5) engineering answers that would cause the problems.A DC series generator is supplying a current of 10 A to a series lighting system through a feeder of total resistance of 2 Ω. The terminal voltage is 2500 V. The armature and series field resistances are respectively 20 and 10 Ω, respectively. A 15-Ω diverter resistance is shunted across the series field. Determine the power developed in the armature of the generator.3-phase,50 Hz, delta connected generator, its stator winding having 12sninai ns pole pair and 6 conductors in each, if the total air gap flux is 160mwb. Find the terminal voltage. The prime mover speed is 750rpm.
- A 3-phase, 50 Hz,2000 kVA, 2300 volt alternator gives a short circuit current of 600 A for a certain field excitation. For the same excitation, the open circuit voltage was 900 volts. The resistance between pair of terminals was 0.12 ohm. B)If the generator is deltaconnected, -Determine the full load regulation at 0.80 lagging pf. -Determine the full load regulation at unity pfTwo shunt generators are operating in parallel and taking equal shares of a 2400 A, 230-V load. The ratings of the generators are as follows: Machine Parameters Regulation (%) Rated Power (kW) Rated Voltage (V) Generator 1 3 500 250 Generator 2 4 600 250 If an additional load of 600-A is connected to the bus, determine the current delivered by each generator at this conditionThe effective resistance of a 2200 V, 50 Hz, 440 KVA, 1 -phase alternator is 0.5 ohm. On short-circuit, a field current of 40 A gives the full load current of 200 AS. The electromotive force on open-circuits with same field excitation is 1160 V. Then the synchronous impedance and reactance is _______ ohm and _______ ohm respectively.
- When using left hand rule for a coil, the fingers point in the direction of ____. a) electron flow, B) line of flux, C) polarity, D) none. Upon what does the strength of an air-cored coil depend? a) amount of current flow, B) number of turns, C) both a and b, d) none Transformers are rated in kilovoltamperes so the sizing of same is independent of the load power factor. A) false, B) trueA 50-kW generator has a full-load efficiency of 90.5 percent. Determine the total losses. Ans.: 5,250 watts explain step by step, circuit diagram, principles etc and also write it clearly.1. Two shunt generators operating in parallel delivering a total load current of 240 A. One of the generators is rated 50 KW and the other 100 KW. The voltage rating of both machines is 500 V and have regulations of 4% and 6% respectively. Assuming linear characteristics, determine (I) the current delivered by each machine (ii) terminal voltage.
- Q1\ A short compound d.c. generator supplies a current of 75 A at a voltage of 225 V. Calculate the generated voltage if the resistance of armature, shunt field and series field windings are 0.04 ohm 90 ohm and 0.02 ohm respectively.Incremental fuel cost of a generator is given as 3 P12+ 40 P1 +90 $/MWh. Give the cost function and Calculate the operating cost of the generator for meeting 100 MW, if the fixed cost is 20$/h?A 3-phase AC generator is supplying power to a load of 3200kW at 2300V and a power factor of 60%. Assume that the loss of the line, the generator armature and the load is equal to 10% of the load, what would be the savings in watts if the power factor were raised to 80%