The Sihwa Lake tidal power station reservoir has a surface area of 30 km. Using an average tidal range of 5.6 m, estimate the energy of this lake as a tidal resource, in GWh/yr. O 553 GWh/yr O 162 GWh/yr O 906 GWh/yr O 1811 GWh/yr
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- A 3-phase transmission line is being supported by three-disc insulators. The potentials across top unit (i.e. near to the tower) and middle unit are 8 KV and 11 KV respectively. Calculate: 1) The ratio of capacitance between pin and earth to the self-capacitance of each unit 2) The line voltage 3) String efficiency Subject Power Transmission And Distribution1. Three equal impedances each having a resistance of 14 omh and inductance of 32 mH are connected in star to a 415, 3-phase 5OHZ system. Calculate (i) the line current (ii) phase current (iii) power consumed.The yearly load duration curve of a certain power station can be approximated as a straight line ; the maximum and minimum loads being 80 MW and 40 MW respectively. To meet this load, three turbine generator units, two rated at 20 MW each and one at 10 MW are installed. Determine (i) installed capacity (ii) plant factor (iii) kWh output per year (iv) load factor.
- A transmission line which is 300 miles long has an inductive reactance of j240 ohms per phase and a line-to-neutral capacitance of -j600 ohms per phase. 1:By calculation, what is the magnitude of the line current I1 in amperes. Round your answer to 2 decimal places.Three Conductors of a 3-phase line are arranged at the corners of a triangle of sides A=4 m, B=2 m, and C=3 m. The diameter of each line conductor is 1.25 cm.(i) Calculate the Capacitance per phase per meter (C) in this arrangement. (ii) Calculate the Capacitance per phase per km(CKM) in nano farad(nF) for the same arrangement. Assume ξo=8.854*10-12 F/m.In the single-phase power system below, determine the voltage, Vab, and current, Iab, being received by the load, 10 + j15 Ω.Answer Format::"Vab = XX.XXXX cis XX.XX V" "Iab = XX.XXXX cis XX.XX A"
- A single phase 11kV line with a length of 15 km is to transmit 500 kVA. The inductive reactance of the line is 0.5Ω / km and the resistance is 0.3Ω / km. calculate the efficiency and regulation of the line for 0.8 lagging power factor.A 3-phase, 50 Hz, overhead transmission line delivers 10 MW at 0·8 p.f. lagging and at 66 The resistance and inductive reactance of the line per phase are 10 W and 20 W respectively while capacitance admittance is 4 × 10- 4 siemen. Calculate : (i)the sending end current (ii) sending end voltage (line-to-line) (iii) sending end power factor (iv) transmission efficiency Use nominal T method.Figure 2.26 shows three loads connected in parallel across a 1000-V(RMS),60Hz single-phase source. Load 1: Inductive load, 125kVA,0.28PF lagging. Load 2: Capacitive load, 10kW,40kvar. Load 3: Resistive load, 15kW. (a) Determine the total kW, kvar, kva, and supply power factor. (b) In order to improve the power factor to 0.8 lagging. a capacitor of negligible resistance is connected in parallel with the above loads. Find the kvar rating of that capacitor and the capacitance in F. Comment on the magnitude of the supply current after adding the capacitor.