3. Determine the subtransient fault current in per-unit and in kA during a bolted throo-phase fault at the bus selected in Problem 2.

Question 2.1 Calculate the current flowing from the home network back into the substation at 11:00 hours. Question 2.2 Calculate the total energy balance of the home network during the 24-hour period (which is the difference between the energy generated within home network and energy consumed in the home network). Use the sign to indicate whether the home network is a net exporter (use negative '-' sign) or importer (use positive '+' sign) of electricity.

Question 3.1 At 11:00 hours there is a difference of 20V between the voltage measured across the loads in the home network and the voltage measured at the substation. Estimate the value of the underground cable resistance Rc that would cause such a voltage difference. Question 3.2 Assume that the value of the underground cable resistance is equal to Rc = 50. Calculate the peak power loss in the underground cable during the 24-hour time period. Question 3.3 Assume that the value of the underground cable resistance is equal to Rc = 5 Q. Calculate the total current flowing from the home network to the substation if all the available appliances are switched on (ignore the time schedule) and the Solar Panels are generating current that is equal to 10 A. Use the sign to indicate whether the (positive) current is flowing from the home network to the substation (in which case you should use positive '+' sign), or whether the (positive) current is flowing from the substation to the home network (in which case you should use negative '-' sign).

Question An AC source at 60 Hz is supplying 25 kW to a load at a lagging power factor of 0.5. If the rms voltage of the supply is 4 kV what capacitance is required to be hooked up in parallel to the load so that the power factor is raised to 0.8 lagging?

Solve for transmission line parameters (R,X) in p.u on all 3 lines (12, 23, 31). Show works in detail. Can handwriting or typed.

Question 4 An ideal transformer is rated to deliver 430 kVA at 220 V (rms) to a customer, as shown in the figure. How much current, in kA, can the transformer supply to the customer? Question 5 An ideal transformer is rated to deliver 422 kVA at 220 V (rms) to a customer, as shown in the figure. If the customer's load is purely resistive, what is the maximum power, in kW, that the customer can receive? Question 6 An ideal transformer is rated to deliver 421 kVA at 220 V (rms) to a customer, as shown in the figure. If the customer's power factor is 0.9 lagging, what is the maximum usable power the customer can receive? Question 7 An ideal transformer is rated to deliver 438 kVA at 220 V (rms) to a customer, as shown in the figure. If the customer requires 341 kW to operate, what is the minimum power factor with the given size transformer?

Problem-1 [80 Points] A 4160 V three-phase feeder is shown in Figure. 1 The phase conductors are 4/0 ACSR and are configured on an 8 ft crossarm with phase spacings of: Dab = 2.5', Dbc=4.5', and Dea = 7.0². a. Determine the series impedance of the line segment in 2/mile. b. Determine the Karop and Krise factors assuming a load power factor of 0.9 lagging. c. Determine the total percent voltage drop to node 6. d. Determine the three-phase kvar rating of a shunt capacitor to be placed at node 4 to limit the total percent voltage drop to node 6 to be 3.0%

2. For the system in the previous problem, compute the fault current and voltages at the fault for the following faults at bus 3: (a) a bolted single line-to-ground fault (b) for the single line-to-ground fault at bus 3, determine the currents and voltages at the terminals of generators G1 and G2. (c) a bolted line-to-line fault (d) a bolted double line-to-ground fault

5. In the previous problem, if breakers B13 and B22 open later than 3 cycles after the fault commences, determine the critical clearing time.

Assignment The noise on HVIL is causing concerns and you need to come up with some ideas on how to solve this. Note from project manager: If necessary, please make a test plan on what needs to be tested or measured and if possible, write down some hypothesises about what could be the problem. Note from HW manager: Please analyse the circuit and try to find potential issues to be tested in the lab as this is much quicker than going for a field test far away. Also, why is there a big difference in HVIL_OK signal between driving and charging when it is not reflected in the HVIL current? Treat this assignment confidentially. You are free to use the internet and search for information, but you are not allowed to share this document or any information in this document with anyone. Good luck!