Electrical plants Describe the working principle by drawing the connection diagram of the three-phase leakage current
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- Discuss causes of insulation failures in high voltage engineering. High voltage engineeringDiscuss Fully the various methods available for transforming 3-phase voltages to higher or lower 3-phase voltages. Highlight the advantages and disadvantages of each. Include the connection diagrams.The number of disc insulators used in a suspension insulator setup with string efficiency 80 %, phase voltage 33 kV, and the voltage across insulator nearest to conductor 11 kV is .......................... Complete the answer.
- What is practical application of PWM?A 5-ohm resistor is connected in series with a 25 micro-farad capacitor. A source voltage of158 volts, 50 Hz supplies the combination. Determine the following:a. Circulating currentb. Voltage across the resistorc. Voltage across the capacitord. Real power supplied by the sourceGrounding methods in Power systems
- Which of the following statements is/are true? (A In purely inductive circuit, the current leads voltage. (B) In purely resistive circuit, the current lags voltage. C In purely resistive circuit, the current is in phase with voltage. D In purely capacitive circuit, the voltage lags current.(b) A symmetrical three-wire three-phase supply as shown in Figure Q2(b) is connected to a balanced three-phase load. The value of impedance, Z is identified to be 100-j75 Q. (i) Find IaB, IBC and ICa (ii) Determine Iaa, IbB and Ic (iii) Determine Iba, Isb and Ix (iv) Draw the phasor diagram of all currents in Q(b)(i) and Q(b)(ii)What is the main direct cause of reactive power in AC system?A. Resistance of transmission linesB. Inductance and capacitance in the loadsC. Ideal transformer connected in the systemD. Power produced by generator
- 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"Question 2 1. Discuss the single-phase circuit with voltage control by integral-cycle triggering resistive load. 2. Two thyristors are connected in inverse-parallel for control of the power flow from a single- phase a.c. supply vs = 240 sinwt to a resistive load with R=25 2. The thyristors are operated with integral-cycle triggering mode consisting of two cycles of conduction followed by two cycles of extin- ction. Calculate: (a) The rms value of the output voltage. (b) The rms value of the current drawn from the source. (c) The power delivered to the load.use kirchhoffs Junction rule and loop rule to solve for currents I1 , I2 and I3..