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MW PG MW MW PG MW MW PG MW

The document outlines various electrical engineering problems related to transmission lines, including the calculation of inductance and capacitance for different configurations. It also describes the development of MATLAB programs to determine economic generation schedules and fuel cost functions for thermal units, as well as power flow solutions using the Newton-Raphson method. Additionally, it includes calculations for fault currents, bus voltages, and efficiency of transmission for specific power system scenarios.

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8 views3 pages

MW PG MW MW PG MW MW PG MW

The document outlines various electrical engineering problems related to transmission lines, including the calculation of inductance and capacitance for different configurations. It also describes the development of MATLAB programs to determine economic generation schedules and fuel cost functions for thermal units, as well as power flow solutions using the Newton-Raphson method. Additionally, it includes calculations for fault currents, bus voltages, and efficiency of transmission for specific power system scenarios.

Uploaded by

rtkarthikapandiae786
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
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1.

Determine the inductance and capacitance per phase of a 3-phase transmission


line in fig. Diameter of the conductors is 2.5 cm. Assume the line is transposed

2. Find the inductance and capacitance per phase of a double circuit, three phase
system as shown in fig. The conductor radius is 2.5cm

3. To write a MATLAB program for determine the economic generation schedules


of three generating units in a power system to meet the system load of 850 MW,
using direct method. The data of the generating units are given below.
Fuel cost function (In Rs/hr) for three thermal units are given by,, F1(P1) =
0.001562 P 2 + 7.92 P1 + 561
F2(P2) = 0.00194 P 2 + 7.85 P2 + 310
F3(P3) = 0.00482 P 2 + 7.97 P3 + 78
Operating limits:
150MW  PG1 600MW
100MW  PG2 400MW
50MW  PG3 200MW

4. To write a MATLAB program for determine the\ fuel cost functions (In Rs/hr)
for three thermal units are given by,
F1(P1) = 0.004 P 2 + 5.3 P1 + 500
F2(P2) = 0.006 P 2 + 5.5 P2 + 400
F3(P3) = 0.009 P 2 + 5.8 P3 + 200
Where P1, P2 and P3 are in MW. The total load is 800 MW. Neglecting line losses
and generator limits, find the optimal dispatch and total cost by Lambda iteration
method.
5.Determined fault current ,bus voltages and line flows ,when short circuit fault
occurs at B us 3 for the system in figure 12 by assumptions

9. Fig. shows the one-line diagram of a simple three bus power system with
generators at buses 1 and 3. The magnitude of voltages at bus 1 is adjusted to 1.05
pu. Voltage magnitude at bus 3 is fixed at 1.04 pu with a real power generation of
200 MW. A load consisting of 400 MW and 250 Mvar is taken from bus 2. Line
impedances are marked in pu on a 100 MVA base, and the line charging
susceptances are neglected. Obtain the power flow solution by, Newton Raphson
method .

6.A three phase, 60 Hz, 40 km long overhead line supplies a load of 381 MVA at
220 kV, 0.8 pf lagging. The line resistance is 0.15 Ω per phase per km and line
inductance is 1.3263 mH per phase per km. Calculate the receiving end voltage,
receiving end current, voltage regulation and efficiency of transmission.

7. A 3-phase, 100 km transmission line is delivering 50 MW, 0.8 pf lagging at


132 kV. Each conductor is having resistance 0.1 ohm/km, reactance 0.3 ohm/km
and admittance 3*10-6 mho/km. If the load is balanced and leakage is neglected,
calculate the sending end voltage, sending end PF, efficiency and regulation of the
line using nominal π representations.

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