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Design Project for ECE473: Transmission Line Engineering - Prof. Said Ahmed-Zaid, Study Guides, Projects, Research of Electrical and Electronics Engineering

Boise State University (BSU)Electrical and Electronics Engineering
Prof. Said Ahmed-Zaid

A design project for ece473 students to design a transmission line that supplies a 250-mw load with specific voltage level, efficiency, and clearance requirements. The project includes delivering a technical report, matlab script, and output results, as well as calculating various transmission line parameters.

Typology: Study Guides, Projects, Research

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Uploaded on 08/19/2009

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ECE473 DESIGN PROJECT FALL 2008
Problem Statement:
Select a standard voltage level and design a transmission line that will supply a 250-MW load at
0.85 power factor lagging that is 200 miles from the source of power. The following specifications
have been established for the line:
•The voltage regulation must be less than 10%.
•The efficiency must be greater than 95% at full load.
•One of the following standard voltage levels must be used: 138, 230, 345, 500, or 765 kV.
•A single circuit line with horizontal configuration is to be used.
•The following clearances between phase conductors must be maintained.
Line Voltage (kV) Clearance (ft)
138 15
230 20
345 30
500 36
765 45
•To control corona, the following are the minimum size conductors or bundles of conductors
that can be used. The standard spacing of 18 inches between bundled conductors in any
configuration is to be used.
Line Voltage (kV) Conductor/Bundle
138 500 MCM ACSR
230 715.5 MCM ACSR
345 2-1033.5 MCM ACSR
500 2-1510.5 MCM ACSR
500 3-1033.5 MCM ACSR
765 4-1033.5 MCM ACSR
Reference:
[1] R. L. McConnell, W. L. Cooley, and N. T. Middleton. Electrical Engineering Design
Compendium. Reading, MA: Addison-Wesley Publishing Company, p. 316, 1993.
1
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ECE473 DESIGN PROJECT FALL 2008

Problem Statement:

Select a standard voltage level and design a transmission line that will supply a 250-MW load at

0.85 power factor lagging that is 200 miles from the source of power. The following specifications

have been established for the line:

  • The voltage regulation must be less than 10%.
  • The efficiency must be greater than 95% at full load.
  • One of the following standard voltage levels must be used: 138, 230, 345, 500, or 765 kV.
  • A single circuit line with horizontal configuration is to be used.
  • The following clearances between phase conductors must be maintained.

Line Voltage (kV) Clearance (ft)

  • To control corona, the following are the minimum size conductors or bundles of conductors

that can be used. The standard spacing of 18 inches between bundled conductors in any

configuration is to be used.

Line Voltage (kV) Conductor/Bundle

138 500 MCM ACSR

230 715.5 MCM ACSR

345 2-1033.5 MCM ACSR

500 2-1510.5 MCM ACSR

500 3-1033.5 MCM ACSR

765 4-1033.5 MCM ACSR

Reference:

[1] R. L. McConnell, W. L. Cooley, and N. T. Middleton. Electrical Engineering Design

Compendium. Reading, MA: Addison-Wesley Publishing Company, p. 316, 1993.

Deliverables:

  1. One technical report per group. The report should include a cover page, summary, introduc-

tion, discussion, conclusion, references, and appendices.

  1. MATLAB script and output results showing that specifications have been met with an exact

π-model of the transmission line. Specifications include:

2.1. An efficiency

η =

P

R

P

S

greater than 95%.

2.2. A voltage regulation

R =

V

S

A| − |

V

R

V

R

less than 10%.

2.3. The maximum electric field at the surface of any conductor should be less than

21 kV(rms)/cm.

  1. Submit the (

A,

B,

C,

D) parameters for a short line model (series impedance model), a

medium-length line model (nominal π-model), and a long line model (exact π-model).

  1. For each of the three line models, compute:

VS =

A

VR +

B

IR = |

VS |

6 θvS

I

S

C

V

R

D

I

R

I

S

6 θ iS

VS |LL =

VS |

pf S

= cos(θ vS

− θ iS

) (specify leading/lagging)

PS = 3 |

VS ||

IS | cos(θvS − θiS )

Q

S

V

S

I

S

| sin(θ vS

− θ iS

S

S

V

S

I

S

  1. The weight of all of the conductors (all three phases).