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A 3-phase transmission line has conductors 1.4 cm in diameter spaced 1 m apart in an equilateral formation. If a current wave of 9 A travels along the line, and the line is connected at the end to a second transmission line with a surge impedance of 470 £2, answer Q34 & Q35: Q. 34. If the resistance and leakance are negligible, calculate the reflected phase voltage value (V): A) 626.6 V B) 576.6 V C) 651.6 V D) 601.6 V

A 3-phase transmission line has conductors 1.4 cm in diameter spaced 1 m apart in an equilateral formation. If a current wave of 9 A travels along the line, and the line is connected at the end to a second transmission line with a surge impedance of 470 £2, answer Q34 & Q35: Q. 34. If the resistance and leakance are negligible, calculate the reflected phase voltage value (V): A) 626.6 V B) 576.6 V C) 651.6 V D) 601.6 V

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
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please solve parts  35 then 34 

Q28. A coaxial cable with a conductor surrounded by two dielectric layers. The radius of the conductor is 0.9 cm. The first dielectric layer has a 1.3 relative permittivity and 4.7 mm thickness. If the second layer has a 3.5 mm thickness and was selected to maintain the same maximum electric field value, find the field value at the middle of the second layer if the applied voltage is 29 kV. A) 2.09 kV/mm B) 2.79 kV/mm D) 3,19 kV/mm C) 3.39 kV/mm Q29. Following measurements are made for a test specimen with a 7 kV rms supply at a frequency of 6 kHz: The air capacitance of the electrode system-30 nF with negligible loss angle. The capacitance and loss angle of the electrodes with specimen are 130 nF and 0.0066 respectively. Assuming there is no additional stray capacitance, determine the dielectric loss factor A) 0.975 pm (B) 0.253 pF/m C) 0.624 pF/m D) 0.080 pF/m Q.30. A solid dielectric exposed to high voltage in a laboratory to determine its mechanical breakdown strength. The dielectric has 0.97 GPa Young's modulus and relative permittivity & 2.2. If the breakdown occurs when the applied voltage reaches 13 MV, determine the initial thickness of the dielectric. A) 3.07 mm B) 3.32 mm C) 2.57 mm D) 2.82 mm Assuming a fixed distance between parallel plates with a uniform field, and assuming unchanged Townsend's coefficients, the pressure is changed, and the breakdown voltage is measured with the following results: At a pressure 650 torr the breakdown voltage is found to be 320 V. At a pressure 850 torr, the breakdown voltage is found to be 370V. Answer Q31 & Q32 Q.31. Find the value of the pressure for minimum breakdown voltage according to Paschen's law. A) 227.88 torr B) 229.88 torr C) 223.88 torr D) 225.88 torr Q. 32. Find the value of the minimum breakdown voltage according to Paschen's A) 231.77 V B) 227.77 V C) 233.77 V D) 229.77 V Q. 33. A cable is tested for partial discharge using the traveling wave technique. If the cable length is 119 km and the velocity of signal propagation in the cable is 0.26 km/us. And the time difference between the pulses measured at the detector at the end of the cable is 220 us. Find the location of the partial discharge point from the receiving end. A) 88.4 km B) 84.4 km C) 90.4 km D) 86.4 km A 3-phase transmission line has conductors 1.4 cm in diameter spaced 1 m apart in an equilateral formation. If a current wave of 9 A travels along the line, and the line is connected at the end to a second transmission line with a surge impedance of 470 22, answer Q34 & Q35: Q. 34. If the resistance and leakance are negligible, calculate the reflected phase voltage value (V): A) 626.6 V B) 576.6 V C) 651.6 V D) 601.6 V Q. 35. If the second transmission line has a resistance of 5 per km and a leakance of 0.9 μ S per km, and if the line is 50 km long and is terminated at the end of the line by a 900 2 star connected load. Find the value of the reflected current wave at the end of the line. A) 2.6 A B)-2.08 A C) -1.66 A D)-3.24 A
Transcribed Image Text:Q28. A coaxial cable with a conductor surrounded by two dielectric layers. The radius of the conductor is 0.9 cm. The first dielectric layer has a 1.3 relative permittivity and 4.7 mm thickness. If the second layer has a 3.5 mm thickness and was selected to maintain the same maximum electric field value, find the field value at the middle of the second layer if the applied voltage is 29 kV. A) 2.09 kV/mm B) 2.79 kV/mm D) 3,19 kV/mm C) 3.39 kV/mm Q29. Following measurements are made for a test specimen with a 7 kV rms supply at a frequency of 6 kHz: The air capacitance of the electrode system-30 nF with negligible loss angle. The capacitance and loss angle of the electrodes with specimen are 130 nF and 0.0066 respectively. Assuming there is no additional stray capacitance, determine the dielectric loss factor A) 0.975 pm (B) 0.253 pF/m C) 0.624 pF/m D) 0.080 pF/m Q.30. A solid dielectric exposed to high voltage in a laboratory to determine its mechanical breakdown strength. The dielectric has 0.97 GPa Young's modulus and relative permittivity & 2.2. If the breakdown occurs when the applied voltage reaches 13 MV, determine the initial thickness of the dielectric. A) 3.07 mm B) 3.32 mm C) 2.57 mm D) 2.82 mm Assuming a fixed distance between parallel plates with a uniform field, and assuming unchanged Townsend's coefficients, the pressure is changed, and the breakdown voltage is measured with the following results: At a pressure 650 torr the breakdown voltage is found to be 320 V. At a pressure 850 torr, the breakdown voltage is found to be 370V. Answer Q31 & Q32 Q.31. Find the value of the pressure for minimum breakdown voltage according to Paschen's law. A) 227.88 torr B) 229.88 torr C) 223.88 torr D) 225.88 torr Q. 32. Find the value of the minimum breakdown voltage according to Paschen's A) 231.77 V B) 227.77 V C) 233.77 V D) 229.77 V Q. 33. A cable is tested for partial discharge using the traveling wave technique. If the cable length is 119 km and the velocity of signal propagation in the cable is 0.26 km/us. And the time difference between the pulses measured at the detector at the end of the cable is 220 us. Find the location of the partial discharge point from the receiving end. A) 88.4 km B) 84.4 km C) 90.4 km D) 86.4 km A 3-phase transmission line has conductors 1.4 cm in diameter spaced 1 m apart in an equilateral formation. If a current wave of 9 A travels along the line, and the line is connected at the end to a second transmission line with a surge impedance of 470 22, answer Q34 & Q35: Q. 34. If the resistance and leakance are negligible, calculate the reflected phase voltage value (V): A) 626.6 V B) 576.6 V C) 651.6 V D) 601.6 V Q. 35. If the second transmission line has a resistance of 5 per km and a leakance of 0.9 μ S per km, and if the line is 50 km long and is terminated at the end of the line by a 900 2 star connected load. Find the value of the reflected current wave at the end of the line. A) 2.6 A B)-2.08 A C) -1.66 A D)-3.24 A
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