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Glover et al - Power System Analysis & Design 7/e (Homework)

James Finch

Engineering, section 1, Fall 2019

Instructor: Dr. Friendly

Current Score : 1 / 24

Due : Sunday, January 27, 2030 12:00 EST

Last Saved : n/a Saving...  ()

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1. 0/1 points  |  Previous Answers GOSBPowerSysAD7 4.2.003. My Notes
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1
0/1
4/100
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0/1
 
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A transmission-line cable with a length of 2.3 km consists of 14 strands of identical copper conductors, each 1.3 mm in diameter. Because of the twist of the strands, the actual length of each conductor is increased by 5%. Determine the resistance (in Ω) of the cable if the resistivity of copper is 1.72 µΩ · cm at 20°C.
Incorrect: Your answer is incorrect.
Your response differs from the correct answer by more than 10%. Double check your calculations. Ω

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2. 0/2 points  |  Previous Answers GOSBPowerSysAD7 4.5.010. My Notes
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1 2
0/1 0/1
2/100 2/100
Total
0/2
 
  • This exercise will let students self-remediate with question-level help.
  • Read It links are available as a learning tool under each question so students can quickly jump to the corresponding section of the eTextbook.
  • Students get just-in-time learning support with Watch It videos that contain narrated and closed-captioned videos walking students through the proper steps to solve a similar problem.

A 60-Hz, three-phase three-wire overhead line has solid cylindrical conductors arranged in the form of an equilateral triangle with 4.1-ft conductor spacing. The conductor diameter is 0.6 in. Calculate the positive-sequence inductance in H/m and the positive-sequence inductive reactance in Ω/km.
positive-sequence inductance   Incorrect: Your answer is incorrect.
Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. H/m positive-sequence inductive reactance   Incorrect: Your answer is incorrect.
Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. Ω/km

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3. 0/1 points  |  Previous Answers GOSBPowerSysAD7 4.6.018. My Notes
Question Part
Points
Submissions Used
1
0/1
1/100
Total
0/1
 
  • This exercise will let students self-remediate with question-level help.
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  • Students get just-in-time learning support with Watch It videos that contain narrated and closed-captioned videos walking students through the proper steps to solve a similar problem.

Calculate the per-distance series impedance (resistance and reactance in Ω/km) for a three-phase, completely transposed transmission line consisting of one ACSR 874.5 kcmil conductor per phase, arranged vertically with a phase spacing of 7.1 m. Assume this line is operated on a 60-Hz system at 50°C. (Enter your answer in rectangular form
a + bj
 for real component a and imaginary component b. Use any necessary data from this table.)
123
Incorrect: Your answer is incorrect. Ω/km

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4. 0/3 points  |  Previous Answers GOSBPowerSysAD7 4.6.022. My Notes
Question Part
Points
Submissions Used
1 2 3
0/1 0/1 0/1
1/100 1/100 1/100
Total
0/3
 
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The conductor configuration of a bundled single-phase overhead transmission line is shown in the figure below.
A conductor configuration consists of two lines, each having three conductors.
  • Line X conductors are situated in an equilateral triangle with its base horizontal and pointing downward. The spacing between conductors is 19 cm.
  • Line Y conductors are situated in a horizontal line, spaced 19 cm apart. The leftmost conductor is 5 m to the right of the rightmost conductor of Line X.
Line X has its three conductors situated at the corners of an equilateral triangle with 19-cm spacing. Line Y has its three conductors arranged in a horizontal configuration with 19-cm spacing. All conductors are identical, solid-cylindrical conductors, each with a radius of 2.1 cm. Find the equivalent representation in terms of the geometric mean radius of each bundle (in m) and a separation that is the geometric mean distance (in m).
geometric mean radius of Line X Incorrect: Your answer is incorrect.
Your response is within 10% of the correct value. This may be due to roundoff error, or you could have a mistake in your calculation. Carry out all intermediate results to at least four-digit accuracy to minimize roundoff error. m geometric mean radius of Line Y Incorrect: Your answer is incorrect.
Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. m geometric mean distance Incorrect: Your answer is incorrect.
Your response differs from the correct answer by more than 10%. Double check your calculations. m

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5. 1/3 points  |  Previous Answers GOSBPowerSysAD7 4.6.025. My Notes
Question Part
Points
Submissions Used
1 2 3
1/1 0/1 0/1
1/100 4/100 1/100
Total
1/3
 
  • This exercise will let students self-remediate with question-level help.
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  • Students get just-in-time learning support with Watch It videos that contain narrated and closed-captioned videos walking students through the proper steps to solve a similar problem.

Consider the following figure.
An overhead line configuration consists of three lines situated in an isosceles triangle, with the base horizontal and pointing upward. The two lower lines are spaced 60 ft apart, and the third line is centered above them (18 ft vertically from the center of one square arrangement to the center of the other). Each line has four conductors that form the corners of a square 21 in tall and 21 in wide.
For the overhead line of configuration shown in the figure operating at 60 Hz and a conductor temperature of 70°C, determine the resistance per phase (in Ω/mi), inductive reactance in Ω/mile/phase, and the current-carrying capacity (in A) of the overhead line. Each conductor is ACSR Curlew of this table. (You may use
XL = 0.2794 log
GMD
GMR
 Ω/mi/phase.
 Assume the resistance of each conductor is 0.120 Ω/mi.)
resistance per phase Ω/mi inductive reactance Incorrect: Your answer is incorrect.
Your response is within 10% of the correct value. This may be due to roundoff error, or you could have a mistake in your calculation. Carry out all intermediate results to at least four-digit accuracy to minimize roundoff error. Ω/mile/phase current-carrying capacity Incorrect: Your answer is incorrect.
Your response is within 10% of the correct value. This may be due to roundoff error, or you could have a mistake in your calculation. Carry out all intermediate results to at least four-digit accuracy to minimize roundoff error. A

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6. –/2 points GOSBPowerSysAD7 4.6.031. My Notes
Question Part
Points
Submissions Used
1 2
–/1 –/1
0/100 0/100
Total
–/2
 
  • This exercise will let students self-remediate with question-level help.
  • Read It links are available as a learning tool under each question so students can quickly jump to the corresponding section of the eTextbook.
  • Students get just-in-time learning support with Watch It videos that contain narrated and closed-captioned videos walking students through the proper steps to solve a similar problem.

Consider the following figure.
The conductor configuration consists of a telephone line centered below a three-phase transmission line. The telephone line's two conductors are situated in a horizontal line 1.3 m apart and 4.2 m below the transmission line and labeled "1" and "2" from left to right. The transmission lines also form a horizontal line labeled "a", "b", and "c" from left to right. The leftmost and rightmost conductors are each 4.8 m from the center conductor.
The figure above shows the conductor configuration of a three-phase transmission line and a telephone line supported on the same towers. The power line carries a balanced current of 250 A/phase at 60 Hz, while the telephone line is directly located below phase b. Assume balanced three-phase currents in the power line. Calculate the voltage per kilometer induced in the telephone line. (Enter your answer in polar form with angle in degrees.)
 ∠  ° V/km

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7. 0/1 points  |  Previous Answers GOSBPowerSysAD7 4.9.038. My Notes
Question Part
Points
Submissions Used
1
0/1
1/100
Total
0/1
 
  • This exercise will let students self-remediate with question-level help.
  • Read It links are available as a learning tool under each question so students can quickly jump to the corresponding section of the eTextbook.

The capacitance per phase of a balanced three-phase overhead line is given by
C = 
0.0389
log
GMD
r
 µF/mi/phase.
Consider a three-phase overhead line made up of three phase conductors: Oriole, 336.4 kcmil, and ACSR 30/7. The line configuration is such that the horizontal separation between center of C and that of A is 54", and between that of A and B is also 54", in the same line; the vertical separation of A from the line of C–B is 17". If the line is operated at 60 Hz at a conductor temperature of 75°C, determine the capacitive reactance per phase in Ω · mi. (Use any necessary data from this table.)
Incorrect: Your answer is incorrect.
Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. Ω · mi
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8. –/5 points GOSBPowerSysAD7 4.10.043. My Notes
Question Part
Points
Submissions Used
1 2 3 4 5
–/1 –/1 –/1 –/1 –/1
0/100 0/100 0/100 0/100 0/100
Total
–/5
 
  • This exercise will let students self-remediate with question-level help.
  • Read It links are available as a learning tool under each question so students can quickly jump to the corresponding section of the eTextbook.
  • Students get just-in-time learning support with Watch It videos that contain narrated and closed-captioned videos walking students through the proper steps to solve a similar problem.

Three ACSR Flamingo conductors are used for a three-phase overhead transmission line operating at 60 Hz. The conductor configuration is in the form of an isosceles triangle with sides of 25, 25, and 42 ft. (Use any necessary data from this table.)
(a)
Find the capacitance-to-neutral (in F/mi) and capacitive reactance-to-neutral (Ω · mi) for each 1-mile length of line.
capacitance-to-neutral   F/mi capacitive reactance-to-neutral   Ω · mi
(b)
For a line length of 190 mi and a normal operating voltage of 220 kV, determine the capacitive reactance-to-neutral (in Ω) for the entire line length as well as the charging current per mile (in A/mi) and total three-phase reactive power supplied by the line capacitance (in Mvar).
capacitive reactance-to-neutral   Ω charging current   A/mi total three-phase reactive power   Mvar

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9. –/4 points GOSBPowerSysAD7 4.11.046. My Notes
Question Part
Points
Submissions Used
1 2 3 4
–/1 –/1 –/1 –/1
0/100 0/100 0/100 0/100
Total
–/4
 
  • This exercise will let students self-remediate with question-level help.
  • Read It links are available as a learning tool under each question so students can quickly jump to the corresponding section of the eTextbook.
  • Students get just-in-time learning support with Watch It videos that contain narrated and closed-captioned videos walking students through the proper steps to solve a similar problem.

A three-phase 60-Hz, 180-km overhead transmission line has flat horizontal spacing with three identical conductors. The conductors have an outside diameter of 3.34 cm with 14 m between adjacent conductors. (Enter your answers to at least three significant figures.)
(a)
Determine the capacitive reactance-to-neutral in Ω · m per phase and the capacitive reactance of the line in Ω per phase. Neglect the effect of the earth plane.
capacitive reactance-to-neutral   Ω · m/phase capacitive reactance of the line   Ω/phase
(b)
Assuming that the conductors are horizontally placed 21 m above ground, repeat part (a) while taking into account the effect of ground. Consider the earth plane to be a perfect conductor.
capacitive reactance-to-neutral   Ω · m/phase capacitive reactance of the line   Ω/phase

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10. –/2 points GOSBPowerSysAD7 4.12.050. My Notes
Question Part
Points
Submissions Used
1 2
–/1 –/1
0/100 0/100
Total
–/2
 
  • This exercise will let students self-remediate with question-level help.
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A 60-Hz, single-phase two-wire overhead line has solid cylindrical copper conductors with a 1.3-cm diameter. The conductors are arranged in a horizontal configuration with 0.7-m spacing and line height of 16 m. Calculate the conductor surface electric field strength in kVrms/cm when the line is operating at 19 kV. (Assume a perfectly conducting earth plane.)
kVrms/cm
Calculate the ground-level electric field strength in kVrms/m directly under one conductor.
kVrms/m
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