At no load condition, a 3- phase, 50 Hz, lossless power transmission line has sending end and receiving end voltages of 400 kV and 420 kV respectively. Assuming the velocity of light, the length of the line, in km, is _______.
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At no load condition, a 3- phase, 50 Hz, lossless power transmission line has sending end and receiving end voltages of 400 kV and 420 kV respectively. Assuming the velocity of light, the length of the line, in km, is _______.
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- A three-phase overhead transmission line is designed to deliver 190.5 M VA at 220 kV over a distance of 63 km, such that the total transmission line loss is not to exceed 2.5 of the rated line MVA. Given the resistivity of the conductor material to be 2.84108-m, determine the required conductor diameter and the conductor size in circular mils. Neglect power losses due to insulator leakage currents and corona.For either single-phase two-wire line or balanced three-phase three-wire line with equal phase spacing D and with conductor radius r, the capacitance (line-to-neutral) in F/m is given by Can=.Figure 4.34 shows double-circuit conductors' relative positions in segment I of transposition of a completely transposed three-phase overhead transmission line. The inductance is given by L=2107lnGMDGMRH/m/phase Where GMD=(DABeqDBCeqDACeq)1/3 With mean distances defined by equivalent spacings DABeq=(D12D12D12D12)1/4DBCeq=(D23D23D23D13)1/4DACeq=(D13D13D13)1/4 And GMR=[ (GMR)A(GMR)B(GMR)C ]1/3 with phase GMRs defined by (GMR)A=[ rD11 ]1/2;(GMR)B=[ rD22 ]1/2;(GMR)C=[ rD33 ]1/2 and r is the GMR of phase conductors. Now consider a 345-kV, three-phase, double-circuit line with phase-conductors GMR of 0.0588 ft and the horizontal conductor configuration shown in Figure 4.35. Determine the inductance per meter per phase in Henries (H). Calculate the inductance of just one circuit and then divide by 2 to obtain the inductance of the double circuit.
- Three ACSR Drake conductors are used for a three-phase overhead transmission line operating at 60 Hz. The conductor configuration is in the form of an isosceles triangle with sides of 20, 20, and 38 ft. (a) Find the capacitance-to-neutral and capacitive reactance-to-neutral for each 1-mile length of line. (b) For a line length of 175 mi and a normal operating voltage of 220 kV, determine the capacitive reactance-to-neutral for the entire line length as well as the charging current per mile and total three-phase reactive power supplied by the line capacitance.The following parameters are based on a preliminary line design: per unitVS=1.0, VR=0.9 per unit, =5000km,Zc=320,=36.8. A three-phase power of 700 MW is to be transmitted to a substation located 315 km from the source of power. (a) Determine a nominal voltage level for the three-phase transmission line, based on the practical line-loadability equation. (b) For the voltage level obtained in part (a), determine the theoretical maximum power that can be transferred by the line.The maximum power flow for a lossy line is somewhat less than that for a lossless line. True False
- A 60-Hz, 765-kV, three-phase overhead transmission line has four ACSR 900 kcmil 54/3 conductors per phase. Determine the 60 Hz resistance of this line in ohms per kilometer per phase at 50C.The capacitance of a single-circuit, three-phase transposed line with the configuration shown in Figure 4.38, including ground effect, and with conductors not equilaterally spaced is given by C20lnDeqrlnHmH8 F/m line-to-neutral where Deq=D12D23D133=GMD r= conductors outside radiusHm=(H12H23H13)1/3HS=(H1H2H3)1/3 Now consider Figure 4.39 in which the configuration of a three-phase, single circuit, 345-kV line with conductors having an outside diameter of 1.065 in. is shown. Determine the capacitance to neutral in F/m, including the ground effect. Next, neglecting the effect of ground, see how the value changes.Explain the difference between AC versus DC transmission line design, reliability, applications and benifits.
- Question 6 – Power Systems Disturbances a) A line has a characteristic impedance of 307.70 and a termination resistance of 6000. Assume that the magnitudes of the initial forward - travelling voltage wave and current wave are 4000V and 13A, respectively. Determine the following: (i) Reflection coefficient of voltage wave. (ii) Reflection coefficient of current wave. (iii) Backward-travelling voltage wave. (iv) Voltage at end of line. (v) Transmission coefficient of voltage wave. (vi) Backward-travelling current wave. (vii) Current flowing through termination resistance. (viii) Transmission coefficient of current wave. lime Raper - MaA three-phase, 50Hz transmission line with a length of "240" is given. It has values of “27” MVA, 0.8 reverse power coefficient and phase voltage “134” kV (phase-phase) for the end of line. Transmission line conductors are placed “3.2” meters apart. The conductors are known to have a resistance of 0.11ohm/km and a diameter of 1.6cm. Neglecting the leaks and using the π equivalent circuit; ( ε0=8.854*10^(-12) F/m, μ0=4*π*10^(-7) H/m) 1) Find the total impedance value of the line, the end of line current, the line voltage at the end of the line, the line head phase and the line beginning line voltage?A three-phase, 50Hz transmission line with a length of "240" is given. It has values of “27” MVA, 0.8 reverse power coefficient and phase voltage “134” kV (phase-phase) for the end of line. Transmission line conductors are placed “3.2” meters apart. The conductors are known to have a resistance of 0.11ohm/km and a diameter of 1.6cm. Neglecting the leaks and using the π equivalent circuit; ( ε0=8.854*10^(-12) F/m, μ0=4*π*10^(-7) H/m) a-) Find the Inductance and Capacitance of the line for 1 km length? b-) Total ohmic resistance of the line c-) The total inductive reactance value of the line