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Q3. (30 marks in total) A) Four generator units (two 500MW and two 600MW, as at Liddel Power Stat...
Question 1: Consider a 3 phase hydropower generator feeding power into the grid bus, which is held at line voltage of 26kV. The internal reactance is 0.8pu for a rated power of 30MVA. (a) Choose...
Question 1: Consider a 3 phase hydropower generator feeding power into the grid bus, which is held at line voltage of 26kV. The internal reactance is 0.8pu for a rated power of 30MVA. (a) Choose as base value So.3-30MVA and Vo.Lu-26k V and calculate the per-unit (b) Assume the generator initially runs overexcited with E-1.3 pu and a real power values for the power and grid voltage output of Pe 0.32pu. Compute the reactive power and the apparent power output...
3. Figure 2 shows a single line diagram of a 13.8 kV primary feeder supplying power...
3. Figure 2 shows a single line diagram of a 13.8 kV primary feeder supplying power to a load at the end of the feeder. A shunt capacitor bank is located at the load bus. The capacitor bank is Y-connected with a reactance Xc = 400/phase. Assume that the voltage at the sending end of the feeder is 5% above rated and theat the load is Y- connected with Ruoad = 200/phase in parallel with load Xload = 400/phase. Determine:...
Q3 (3 marks) (4 marks) Two wattmeters are connected in the a and b phases, with...
Q3 (3 marks) (4 marks) Two wattmeters are connected in the a and b phases, with the ends of the voltage coils connected in the c phase, of a balanced three phase star- connected lagging load. Draw a circuit diagram showing the three phases, the wattmeters and the load. Draw a phasor diagram of the phase voltages and currents, the voltages across the wattmeter voltage coils, and the angles between the wattmeter voltages and currents. Show that the sum of...
Please show detailed steps. Thanks Problem # 1: Three Phase Power [35 points] A three-phase substation...
Please show detailed steps. Thanks
Problem # 1: Three Phase Power [35 points] A three-phase substation bus supplies three wye-connected three phase loads that are connected in parallel through a three-phase feeder with an impedance of 0.3 30 per phase Load 1 draws 75kVA at 0.866 lagging power factor, load 2 draws 45 kW at 0.70 leading power factor and load 3 draws 20 kVAR at 0.85 lagging power factor. The line-line voltage at the load is 460V Take the...
a. The figure below is a set of Synchronous Generator and Synchronous Motor. The ratings of...
a. The figure below is a set of Synchronous Generator and Synchronous Motor. The ratings of the machines are as follows: Synchronous Generator:. 3ph, 1.0MVA, 2.3kV, 50Hz, 0.85 lagging power factor, X.=0.9 pu Synchronous Motor: 3ph, 0.5 MVA, 2.36V, 50Hz, 0.85 leading power factor, X.=0.8 pu Synchronous generator Synchronous motor The generator is equipped with a voltage regulator which maintains the terminal voltage at the rated value. The motor delivers 500 hp and it field current is adjusted to make...
Q2 (a) A star connected 6.6kV, 8MVA synchronous generator operating at 7MW and a 0.88 lagging power factor is connected to the Grid. The synchronous reactance is 1.5Ω (i) Calculate the phase current,...
Q2 (a) A star connected 6.6kV, 8MVA synchronous generator operating at 7MW and a 0.88 lagging power factor is connected to the Grid. The synchronous reactance is 1.5Ω (i) Calculate the phase current, excitation voltage and load angle. [10] (ii) What is the maximum theoretical power at this excitation? Draw a phasor diagram (to scale) and from this estimate the phase current and power factor when operating at this point. 151
Q2 (a) A star connected 6.6kV, 8MVA synchronous generator...
(40%) Problem 2 of 3: An engine-generator set is paralleled with a 13.2 kv, 60 Hz infinite (utili...
please show steps. Thank you.
(40%) Problem 2 of 3: An engine-generator set is paralleled with a 13.2 kv, 60 Hz infinite (utility) bus to deliver power to a 2000 kw plant load at 0.866 lagging power factor. The synchronous generator is wye-connected and rated 3750 kva, 13.2 kv, and 0.8 power factor lagging with 1.0 per unit synchronous reactance and negligible armature resistance. 13.2 kVI 60 Hz I infinite bus utility) rated: 3750 kva 0.8 lag load: 2000 kW...
Search Results for: A 100 kVA, 1100 V, three-phase, 6-pole, Y-connected, 50 Hz synchronous machine has synchronous reactance of 6 $2 per-phase and negligible armature resistance. Its core losses are 7 kW and its friction and windage losses are 8 kW. The s
A 100 k VA, 1100 V, three-phase, 6-pole, Y-connected, 50 Hz synchronous machine has synchronousreactance of 6 92 per-phase and negligible armature resistance. Its core losses are 7 k W and itsfriction and windage losses are 8 kW. The speed droop is 2.5%.Initially the machine is operated alone as a generator and the field current is adjusted such that theno-load voltage equals the rated voltage.a) If the generator is supplying a line current of $2.5 A at 0.85 PF lagging....
3. (30) A simple power system, shown below, is made up of a synchronous generatcr connected to a synchronous motor through a couple of transformers and a transmission line. The reactances of the...
3. (30) A simple power system, shown below, is made up of a synchronous generatcr connected to a synchronous motor through a couple of transformers and a transmission line. The reactances of the different elements of the system are all given in pu as: Xsg-0.5 X of each transformer-10 % Xsm-0.5 X transmission line 0.3 The synchronous motor is connected to an infinite bus Hint: The great advantage of an infinite bus is that it always remains constant and our...
A 100MVA synchronous generator is connected to a 25kV infinite bus through two parallel transmission lines....
A 100MVA synchronous generator is connected to a 25kV infinite bus through two parallel transmission lines. The synchronous reactance of the generator is 2.5Ω. Each transmission line has inductive reactance of 2Ω and 0.2Ω resistance. The generator delivers 90MVA to the infinite bus at 0.8 power factor lagging. For the above conditions, calculate: a. The terminal voltage of the generator b. The equivalent field voltage and power angle c. The real power output at the generator terminals d. The reactive...
Question 1: Consider a 3 phase hydropower generator feeding power into the grid bus, which is held at line voltage of 26kV. The internal reactance is 0.8pu for a rated power of 30MVA. (a) Choose as base value So.3-30MVA and Vo.Lu-26k V and calculate the per-unit (b) Assume the generator initially runs overexcited with E-1.3 pu and a real power values for the power and grid voltage output of Pe 0.32pu. Compute the reactive power and the apparent power output...
3. Figure 2 shows a single line diagram of a 13.8 kV primary feeder supplying power to a load at the end of the feeder. A shunt capacitor bank is located at the load bus. The capacitor bank is Y-connected with a reactance Xc = 400/phase. Assume that the voltage at the sending end of the feeder is 5% above rated and theat the load is Y- connected with Ruoad = 200/phase in parallel with load Xload = 400/phase. Determine:...
Q3 (3 marks) (4 marks) Two wattmeters are connected in the a and b phases, with the ends of the voltage coils connected in the c phase, of a balanced three phase star- connected lagging load. Draw a circuit diagram showing the three phases, the wattmeters and the load. Draw a phasor diagram of the phase voltages and currents, the voltages across the wattmeter voltage coils, and the angles between the wattmeter voltages and currents. Show that the sum of...
Please show detailed steps. Thanks
Problem # 1: Three Phase Power [35 points] A three-phase substation bus supplies three wye-connected three phase loads that are connected in parallel through a three-phase feeder with an impedance of 0.3 30 per phase Load 1 draws 75kVA at 0.866 lagging power factor, load 2 draws 45 kW at 0.70 leading power factor and load 3 draws 20 kVAR at 0.85 lagging power factor. The line-line voltage at the load is 460V Take the...
a. The figure below is a set of Synchronous Generator and Synchronous Motor. The ratings of the machines are as follows: Synchronous Generator:. 3ph, 1.0MVA, 2.3kV, 50Hz, 0.85 lagging power factor, X.=0.9 pu Synchronous Motor: 3ph, 0.5 MVA, 2.36V, 50Hz, 0.85 leading power factor, X.=0.8 pu Synchronous generator Synchronous motor The generator is equipped with a voltage regulator which maintains the terminal voltage at the rated value. The motor delivers 500 hp and it field current is adjusted to make...
Q2 (a) A star connected 6.6kV, 8MVA synchronous generator operating at 7MW and a 0.88 lagging power factor is connected to the Grid. The synchronous reactance is 1.5Ω (i) Calculate the phase current, excitation voltage and load angle. [10] (ii) What is the maximum theoretical power at this excitation? Draw a phasor diagram (to scale) and from this estimate the phase current and power factor when operating at this point. 151
Q2 (a) A star connected 6.6kV, 8MVA synchronous generator...
please show steps. Thank you.
(40%) Problem 2 of 3: An engine-generator set is paralleled with a 13.2 kv, 60 Hz infinite (utility) bus to deliver power to a 2000 kw plant load at 0.866 lagging power factor. The synchronous generator is wye-connected and rated 3750 kva, 13.2 kv, and 0.8 power factor lagging with 1.0 per unit synchronous reactance and negligible armature resistance. 13.2 kVI 60 Hz I infinite bus utility) rated: 3750 kva 0.8 lag load: 2000 kW...
3. (30) A simple power system, shown below, is made up of a synchronous generatcr connected to a synchronous motor through a couple of transformers and a transmission line. The reactances of the different elements of the system are all given in pu as: Xsg-0.5 X of each transformer-10 % Xsm-0.5 X transmission line 0.3 The synchronous motor is connected to an infinite bus Hint: The great advantage of an infinite bus is that it always remains constant and our...
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