Give all your answers correct to 4 d.p. A 380 V, 60 Hz, 6-pole, 1,150 rpm, star connected induction motor has the follow

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Give All Your Answers Correct To 4 D P A 380 V 60 Hz 6 Pole 1 150 Rpm Star Connected Induction Motor Has The Follow 1 (45.74 KiB) Viewed 56 times

Give All Your Answers Correct To 4 D P A 380 V 60 Hz 6 Pole 1 150 Rpm Star Connected Induction Motor Has The Follow 2 (47.9 KiB) Viewed 56 times

Give All Your Answers Correct To 4 D P A 380 V 60 Hz 6 Pole 1 150 Rpm Star Connected Induction Motor Has The Follow 3 (34.25 KiB) Viewed 56 times

Give All Your Answers Correct To 4 D P A 380 V 60 Hz 6 Pole 1 150 Rpm Star Connected Induction Motor Has The Follow 4 (32.35 KiB) Viewed 56 times

Give all your answers correct to 4 d.p. A 380 V, 60 Hz, 6-pole, 1,150 rpm, star connected induction motor has the following parameters: stator and rotor resistances are 1.3 each, and stator and rotor leakage reactance are 2.5 each (magnetising reactance can be neglected). The motor is controlled by simultaneous stator voltage and frequency variation. Voltage boost is not used and the motor is controlled using VII = constant law. The motor is supplied from a three-phase voltage source inverter a) The motor operates at 20 Hz. Calculate the ratio of the maximum torque at this frequency with respect to the one at rated frequency, for both motoring and generation. (5 marks) For the motoring case the ratio is: Number For the generation case the ratio is: Number b) For the same 20 Hz operating frequency, calculate ratio of the starting current at this frequency with respect to the starting current at rated frequency. [5 marks] Starting current ratio is: Number C) Assume that the voltage boost of 50 V (phase voltage) is used. Calculate new value of the phase voltage that would be applied in this case for the operating frequency of 20 Hz. Repeat part b) with this new voltage applied. [6 marks] Phase voltage: Number V Starting current ratio: Number d) A variable-speed electric drive can operate in two distinct speed control regions. Name these regions, explain the principal difference between them and specify which quantity is kept constant in each of the two [4 marks) A--L. BIUS** Shes Font Size
Give ALL your answers correct to 4 d.p. Include minus sign in your answers where necessary. A load of 15 MW, with power factor 0.75 lagging, is supplied at a voltage level of 11 kV. The impedance of the line between the point of common coupling (PCC) and the load connection point is Z = (0.4+j0.9) 1. Power factor of the load is further improved to 1 (unity power factor operation) by adding the reactive power compensator at the load connection point. Part A) Calculate the current, impedance drop, and sending end voltage, before power factor correction [7 marks]: Current, I = Number Number A Impedance drop, AU = Number Number V Sending end voltage, IEI = Number Number V Part B) Determine the current, impedance drop, and sending end voltage, after power factor correction [7 marks]: Current, I = Number Number A Impedance drop, AV = Number Number V Sending end voltage, E = Number Number V Part C) Find the voltage drop for parts a) and b) above, as well as the corresponding power factor at the PCC. [6 marks] Parta: Voltage drop, IAV I= Number V power factor, Number Part b: Voltage drop, IAVI = Number V power factor, Number
Give all your answers correct to 4 d.p. Part of a power system is illustrated in the figure below. Three synchronous generators are connected in parallel to the same 6.6 kV bus-bars (G1:3 MVA. 0.08 pu; G2:5 MVA, 0.12 pu, G3: 7 MVA, 0.16 pu). The feeder has reactance of 0.125 km and is 10 km long. The remote end of the feeder is connected to the primary of a 250 KVA, 6600/415 VN transformer, with reactance of 0.05 pu. Select the common power base as 100 MVA. GI Feeder G2 Үy0 G3 Part a) Determine the generator (x-") per unit reactance for the given common power base [3 marks): Xi's Number p.u. X2' = Number p.u. Xg' = Number p.u. Calculate the per-unit and absolute values of the fault level and fault current if a three-phase short circuit takes place on the 6.6 kV bus-bars (point 1 in the figure above) (4 marks): Isc = Number p.u. Sec = Number p.u. Ise Number KA Sac = Number MVA Part b) Calculate the feeder and transformer per unit reactance (using the base voltage and base power of
Ssc = Number p.u. Isc = Number KA Sse = Number MVA = Part b) Calculate the feeder and transformer per unit reactance (using the base voltage and base power of 6.6 kV and 100 MVA) [3 marks): Xc = Number p.u. (feeder) Xor = Number p.u. (transformer) Calculate the per-unit and absolute values of the fault level and fault current if a three-phase short circuit takes place on the secondary of the transformer (point 2 in the figure above) (4 marks]: se = Number p.u. Ssc = Number p.u. Isc = Number KA Ssc = Number MVA Part c) Using the text box below, discuss the method of analysis that has to be used in the case of asymmetrical faults. Which are the most important asymmetrical faults (150 words max)? [6 marks) (This question is manually graded.) படியான E A. ATBIUS** Styles Font Sce Words: 0/150