5. Determine the bus admittance matrix [Ybus] of the representative power system shown in Figure 5. Data for this system is given in Table 5. Fig.5 One line diagram of the power system Table: 5 Line charging y/2 0.03 0.025 0.020 Bus code l-k Impedance, Z 0.02 +0.06 0.08 + 0.24 1-2 1-3 2-3 0.06 +0.18

5. Determine the bus admittance matrix [Ybus] of the representative power system shown in Figure 5. Data for this system is given in Table 5. Fig.5 One line diagram of the power system Table: 5 Line charging y/2 0.03 0.025 0.020 Bus code l-k Impedance, Z 0.02 +0.06 0.08 + 0.24 1-2 1-3 2-3 0.06 +0.18

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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Given a 400sq.m single family dwelling unit to be provided with 230V, 1-phase, 2-wire be service, andhaving the following loads: 2-1.5hp A/C, 2-1.0hp A/C, 1-0.5hp water pump, 4-800W water heater, 2-6kWelectric range and 2-1kW microwave oven, determine a) the total connected load, b) the total demand load,c) the overall %demand factor, d) the size of THW feeder conductor, ground wire and IMC conduit, e) therating of feeder overcurrent protection using inverse time circuit breaker
A single line diagram of a system is shown in Fig. All the values are in per unit on a common base. The power delivered into bus 2 (an infinite bus having a voltage of 1.0 pu) is 1.0 pu at 0.80 power factor lagging. Obtain the power angle equation and the swing equation for the system. Neglect all losses.
Company Y would like to have a new installation transmission line to open a small new city consist of 300 MW with 0.85 power factor lagging at full load. The new transmission line required 132 kV with 124.274 miles long. All the elements needed for the new transmission line is listed in table shown in the picture. You are required to model the transmission line and analysed the performance of the new transmission lines in terms of voltage regulation and efficiency. Note that the frequency used is 50 Hz.
The single line diagram of a small power system isshown in Fig. 1. The corresponding reactancediagram, with reactances in per unit, is shown inFig. 2. A generator with emf equal to 1.25∠0° perunit is connected through a transformer to highvoltage node 3, while a motor with internalvoltage equal to 0.85∠ − 45° per unit is similarlyconnected to node 4. Develop the nodaladmittance matrix for each of the networkbranches and then write the nodal admittanceequations of the system.
Given a 400sq.m single family dwelling unit to be provided with 230V, 1-phase, 2-wire service, and having the following loads: 2-1.5hp A/C, 2-1.0hp A/C, 1-0.5hp water pump, 4-800W water heater, 2-6kW electric range and 2-1kW microwave oven, determine the total connected load in volt-ampere (VA). Write your answer in numerical format without decimal places.
5. A strong driver with Thevenin equivalent resistance of 10 ohms drives a transmission line with Z 40 ohms. The load is terminated with 30 ohms resistor. Plot the voltage at the 1/3 point and end of the line.
(1) Given a 400sq.m single family dwelling unit to be provided with 230V, 1-phase, 2-wire service, and having the following loads: 2-1.5hp A/C, 2-1.0hp A/C, 1-0.5hp water pump, 4-800W water heater, 2-6kW electric range and 2-1kW microwave oven, determine the total connected load in volt-ampere (VA). (2) Given a 400sq.m single family dwelling unit to be provided with 230V, 1-phase, 2-wire service, and having the following loads: 2-1.5hp A/C, 2-1.0hp A/C, 1-0.5hp water pump, 4-800W water heater, 2-6kW electric range and 2-1kW microwave oven, determine the rating of feeder overcurrent protection in ampere-trip (AT) using inverse time circuit breaker. Write your answer in numerical format without decimal places
S.4) the length of a three-phase power transmission line with a Nominal operating voltage of 69 kV is 16km. The impedance of the transmission line per unit length is 0.125 + j0.4375 ohm/km. From the end of the line, a 56 MW star connected load is fed with a power coefficient of 0.8 back under a 64 kV interphase voltage. If the line head voltage of the transmission line is 69 kV, calculate the capacity and power of the star-connected capacitor to be shunted into the load connected to the end of the line.
The figure below shows a radial transmission system with a generator having a terminal voltage of 95 KV at angle of10.5°. The load demand is 50 MW at a power factor of 0.88 lagging. Use a base of 128.4MVA . Instructions :round of to 2 decimal places. Calculate the following : 1.Per unit voltage of the transformer 1 2.Per unit impedance of the line. 3.Resistance of the transmission line when the load consumes full-load (Ω).
Fig. 1 shows the one-line diagram of a 5-bus power system with line impedances and voltage levels in per-unit. The circuit of Fig. 1 has the linear graph shown in Fig. 2, with arrows indicatingdirections assumed for the branches a to h. a) Determine branch-to-node incidence matrix A for the circuit with node 0 as referenceb) Find the circuit Ybus using equation Ybus = ATYpr Ac) A new branch having impedance j0.5 is added between nodes 3 and 4 in the network in Fig. 1. Modify Ybus matrix obtained in part b to account for addition of the new branch.
An electrical motor is supplied from a three-phase ,50 Hz, 410 V system on-board a LNG carrier .When connected in star , it takes a line current of 35 A at a power factor of 0.66 leading. The LNG carrier arrives at port and the motor is subsequently used for powering a container crane It is now connected in delta and is supplied on-shore .Determine for this motor when it takes 64 A at 310 V, from the on-shore supply: 2.1 The power factor of the motor 2.2 the frequency of the supply The motor is returned back to its initial supply and now connected with a new motor in parallel . The new motor is connected in delta and it takes 48.216 kVA at a power factor of 0.77597 lagging with a supply of 50 Hz, 410 V system. Determine for this new arrangement : 2.3 The power factor 2.4 Apparent power taken 2.5 True power taken 2.6 Reactive power taken
A three-phase transmission line receiving end voltage is rated at 21 kV. A load of 1500 KW is connected at the receiving end of the transmission line 70 km long. The parameters of the transmission line are given by r = 0.09 Ω/km and x = 0.8 Ω/km. If the machine is working at 0.65 power factor lagging. Determine a) The series reactance of the transmission line b) Sending end line voltage c) Percentage Voltage regulation d) Percentage Efficiency