1. A single-circuit 60-Hz high voltage power transmission line is 370 km (230 mi) long. The conductors are Rook with flat horizontal configuration and 7.25-V123.8 ft.) conductor spacing. The load on the line is 125 MW at 100% power factor. Use attached Tables AS to to determine;
a. The sending end voltage Vs
b. The sending end current Is
c. The sending end power Ps
d. The percentage voltage regulation
e. The transmission efficiency
Hint: All calculations arc done at conductor temperature of 50°C
2. Given that Ds for the Rook conductor is 0.0327 ft., and its resistance is 0.1603Q/ mi ,determine;
a. The phase inductance of the transmission line in toll 1 mi
b. The line series impedance z in Q/mi
c. The line capacitance C,,
d. The line shunt admittance y in Q"' I mi
e. Compare the parameters obtained to the tabulated values
3. Repeat Problem (1) using the per-unit system. (Hint: Use 125 MVA and 215 kV as base values and then determine both the base current and base impedance)
4. A single-circuit 60-Hz high voltage power transmission line is 181 km (112.5 mi) long. The conductors are Dove with flat horizontal configuration and 7.25 m (23.8 ft.) conductor spacing. The load on the line is 70 MW at 100% power factor. Use attached Tables A3 to A5 to determine;
a. The ABCD constants of the line
b. The sending end voltage Vs
c. The sending end current Is
d. The sending end power Ps
e. The percentage voltage regulation
f. The transmission efficiency
5. Find the equivalent- r circuit (equivalent to the long It model) for the power transmission line given in problem (1) and compare it with the nominal-yr circuit model (Hint: calculate the % difference of the equivalent series impedance shunt reactance from the nominal-rcircuit values. Please discuss your results'
6. A short 3-phase, 34kV power transmission line delivers a load of 10-MW at a power factor of 0.9 lagging and 34-kV. If the series impedance of the line is 10+j15521 phase calculate;
a. The ABCD constants
b. The sending end voltage Vs
c. The sending end current Is
d. The percentage voltage regulation
e. The transmission efficiency