Electrical plants Describe the working principle by drawing the connection diagram of the three-phase leakage current
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Q: vlll=240 il=0.1A P1=19W P2=19W PINPUT=38W Please solve question 2 and 3 of the report section
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- Discuss causes of insulation failures in high voltage engineering. High voltage engineeringWhat is practical application of PWM?Q20. The section bus-bars A and B as shown in Figure B5 are linked by a bus-bar reactors each rated at 5000 kVA with 10% reactance. On bus-bar A, there are two generators each of 10,000 kVA with 10% reactance and on B two generators each of 8000 kVA with 12 % reactance. Find the Current and MVA that fed into a dead short circuit between all phases on B with bus-bar reactor in the circuit. Page 4 of 5 جامعة التقنية والعلومر التطبيقية بإبراء University of Technology and Applied Sciences - Ibra Student ID: Section: Student Name: 8,000 kVA 12% 10,000 kVA 10,000 kVA 10% 8,000 kVA 12% 10% 2 3 5,000 kVA 10% lell 8,000 kVA 10% Figure B5 "End of Question Paper"
- The direct electrical connection of the windings allows transient over voltages to pass through the auto transfonner more easily, and that is an important disadvantage of the autotransformer. (a) True (b) FalseConsider the three single-phase two-winding transformers shown in Figure 3.37. The high-voltage windings are connected in Y. (a) For the low-voltage side, connect the windings in , place the polarity marks, and label the terminals a, b, and c in accordance with the American standard. (b) Relabel the terminals a, b, and c such that VAN is 90 out of phase with Va for positive sequence.An ac resistance is higher than a dc resistance. True False
- The core of a transformer operating at 50 Hz has an eddy current loss of 100 W/m3 and the corelaminations have a thickness of 0.50 mm. The core is redesigned so as to operate with the same eddycurrent loss but at a different voltage and at a frequency of 250 Hz. Assuming that at the new voltage themaximum flux density is one-third of its original value and the resistivity of the core remains unaltered,determine the necessary new thickness of the laminations. Clear and detailed solution.Ans:32.4 kV I have the solution but didnt understand.Kindly explain the solution.Q.4/ choose true or false: 1. The reluctance of any core is proportional directly with the length of it and inversely with both the permeability and the cross-section area of it. 2. The number of parallel paths in wave windings is equal to twice of the number of poles. 3. In dc machines with same values of Z, N, Ø, the emf for wave winding type is more than emf of lab winding type. 4. If we insert a current in such a conductor subjected to a constant magnetic field, a movement will achieved giving the principle of electric generator.
- If 3-phase transfomer configuration in figure in has the givens as listed below: E-line on high side = 480V, turns ration = 2:1/coil, resistance per load =10, efficienscy = 100%. E/coil on the high side is _____, E/coil on the low side is___, E-phase on the low side is____, E/resitor of the load is____,(a-480v, b-240v, c-120 d-69.28v) I/resitor on the load is____, I-line on the low side is___, I-phase on the low side is____, I/coil on the low side is____(a-2A b-4A c-6.93 d-12A), I-phase on the high side is____, I-line on the high side is____(a-1A b-1.73A c-2A d-4A), Va/phase of the load is____, 3-phase Va on the high side is____(a-120VA b-360VA c-480VA d-1440VA).(5) Primary AC Source Transformer Secondary AC/DC Full-wave Rectifier Capaictor in Non- linear Load Figure 6 Analyse different methods of harmonics mitigation to eliminate the harmonic, which you have identify in above power system circuit. You can use harmonic filters, K or equivalent transformers or oversized neutral method depending upon the harmonic sources.Id is : 510221
