Determine the sending-end phase voltage, sending-end line current, sending-end phase complex power

INSTRUCTIONS TO CANDIDATES

ANSWER ALL QUESTIONS

The Fig. 1 shows a three-phase 69-kV, 60 Hz, 300-km, on a steel tower completely transposed, has stranded conductors per phase, symmetrical about both the horizontal and vertical center lines. Each strand has a radius of 4 cm. The line spacing is measured from the center of a strand.

The resistance of the transmission line is 2.84vIOE4 1-rn and the line is lossless. The line delivers 70 MVA, 0.8 power factor lagging and at 64 kV.

a b c  -3 

14m : 14m .

Fig. 1

A. Set up MATLAB Ijie linejnodel.in to conduct the following runs on the simulation:

1. Determine the RLC parameters of the line.

2. Determine the ABCD transmission matrices of the following:

(a) The series RL circuit model of the whole line.

(b) The nominal ir circuit model of the whole line.

(e) The equivalent rcircuit model of the whole line.

3. Determine the sending-end phase voltage, sending-end line current, sending-end  phase complex power, power factor, the percent voltage regulation, and the transmission efficiency for:

(a) The series RL circuit model of the whole line.

(b) The nominal Yr circuit model of the whole line.

(c) The equivalent Yrcircuit model of the whole line

B. ETAP Simulator Using Actual Transmission Line Parameters. The receiving-end power  is 70 MW at 0.8 power factor lagging and at 64 kV. Use the self GMD of a single conductor determined above in the computation.

1. Determine the RLC (given above) parameters of the transmission line per km.

2. Set up ETAP file line_mnodell .oti to conduct the following runs on the simulation:

(i) Determine the sending-end phase voltage, sending-end line current, sending- end complex power, power factor, and the percent voltage regulation. Keep

the phase angle of the receiving-end voltage at 1 .0LQ p.u.

(ii) Determine the sending-end phase voltage, sending-end line current, sending

end phase complex power, and power factor.

C. Compare results of A to B.

Attachments:

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