1 / 13

Pharos University EE-272

Pharos University EE-272. Electrical Power Engineering 1 “Electrical Engineering Dep ” Prepared By: Dr. Sahar Abd El Moneim Moussa. OverHead Transmission Line medium OHTL. 2- Medium OHTL : ( from 80 km to 240 km) The medium OHTL can be represented either by:

nimrod
Download Presentation

Pharos University EE-272

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Pharos UniversityEE-272 Electrical Power Engineering 1 “Electrical Engineering Dep” Prepared By: Dr. SaharAbd El MoneimMoussa Dr. SaharAbd El MoneimMoussa

  2. OverHead Transmission Linemedium OHTL Dr. Sahar Abd El Moneim Moussa

  3. 2- Medium OHTL: ( from 80 km to 240 km) The medium OHTL can be represented either by: • - equivalent circuit • T- equivalent circuit Dr. Sahar Abd El Moneim Moussa

  4. j X IS Ir R ICR Ics I VS VR C/2 C/2 i- - Circuit: • Equivalent Circuit: Dr. Sahar Abd El Moneim Moussa

  5. The General equation is: • In Matrix Form : VS = 1+ Z VR IS= 1+IR Dr. Sahar Abd El Moneim Moussa

  6. The ABCD Parameters of a short T.L: A=D= 1+, B=Z, C= • Efficiency: x100% • Voltage Regulation: = x100 Dr. Sahar Abd El Moneim Moussa

  7. i- T- Circuit: • Equivalent Circuit: Dr. Sahar Abd El Moneim Moussa

  8. The General equation is: • In Matrix Form : VS= 1+Z VR IS= 1+IR Dr. Sahar Abd El Moneim Moussa

  9. The ABCD Parameters of a short T.L: A=D= 1+, B= Z, C= • Efficiency: x100% • Voltage Regulation: = x100 Dr. Sahar Abd El Moneim Moussa

  10. Example 9 A 50 Hz 200 km, transmission line has 132 kV between the lines at the receiving end and has per phase R=0.1 /km , L=0.828 mH/km And C= 0.005 F/km. the line is supplying a load of 30MW at 0.85 lagging pf. Find using approximated -model: • A,B,C and D constants of the line • V and I at the sending end of the line •  and VR of the line Dr. Sahar Abd El Moneim Moussa

  11. Solution: Z= R+ j L= 0.1 x 200 + j 2 x x 50 x 0.828 x 10-3 x 200 = 20 + j 52  = 55 69  Y= j C= j 2 x  x 50 x 0.005 x 10-6 x 200 = j 314 x 10-6mho= 314x10-690 mho YZ= -0.016 + j 0.00628 ( 1) • A= D= 1 B= Z= 20 + j 52  = 55 69  C= Y = j 314 x 10-6mho= 314x10-6 90 mho Dr. Sahar Abd El Moneim Moussa

  12. b) Vs= A VR + B IR = VR + Z IR VR (ph)= IR= = Vs= 76210 0 + 55.7 69 x 154 -31.8= 83200 3.6 V Is= C VR= + DIR= Y VR+ I R = 314 x 10-690 x 76210 0 + 154 -31.8= 143 -23.5 A Dr. Sahar Abd El Moneim Moussa

  13. c) PR= 30 MW PS = 3 x VSph x Is x Cos S S= VS - IS= 3.6 –(23.5) = 27.1 PS= 3 x 83200 x 143 x cos 27.1= 31.77 MW %= VR% = Dr. Sahar Abd El Moneim Moussa

More Related