Assume that a primary feeder length L=2.4Km has a constant K = 0.002 (%VD/KVA.mil) and that a lumped sum load 800KW with power factor PF=0.8 is connected at the end of this feeder (take 1mile = 1.6km). The percentage voltage drop %VD in this feeder will be
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- A single phase AC distributor AB 500 m long is fed from end A and is loaded as under: (i) 70A at 0.707 p.f. leading150m from point A (ii) 30A at 0.8 p.f. lagging 500m from point A The load resistance and inductive reactance of the distributor is 0.3 Ω and 0.2 Ω per kilometer. If the voltage at the far end (B) is maintained at 230V, calculate the voltage at the sending end. The load power factor is referred to the voltage at the far end.1. Repeat Example 4.2, parts (a) and (b), assuming a three-phase 34.5 kV wye-grounded feeder main that has 350 kcmil 19-strand copper conductors with an equivalent spacing of 37 in between phase conductors and a lagging-load power factor of 0.9. K=3.5935 ×10-5 [%VD/KVA-mi]Below attached image is for example 4.2Shown are two buses connected via a transmission line. Connected to Bus 1 is a generator(modelled as a voltage source V1), and to Bus 2 is a generator( with Voltage V2) and a load. The line impedance Z = R + jX is not known. Three-phase load is forecasted as 100MW + 60MVar. Generator at Bus 2 is scheduled to deliver 40MW and its excitation is adjusted for the machine to deliver 55 MVar. Voltage at Bus 1 is 241 KV angle 10 deg, while voltage at bus is 230 kV; use V2 as the reference for all angles. 1. What is the current (RMS) in amperes drawn by the load connected to Bus 2? 2. How much real power (in MW) is delivered by the generator connected to Bus 1? 3. What is the total real power loss along the line, in percent of the load? 4. What is the X/R Ratio of the line impedance?
- In a 3-phase, 4-wire system, the currents in R. Yand B lines under abnormal conditions of trading are as under IR-100 230 A; IY-50 2300 A: IB-30 2180 A Calculate the positive, negative and zero sequence currents in the R-line and return current in the neutral wire.A short 3, 3 wire transmission line has an impedance per wire of 15+j20 Ω. The sending end line to line voltage is 13,200 V and the receiving end load takes 1,000 kW at a lagging power factor and the current per conductor is 70 A. What is the receiving end voltage and power factor? Note: draw the current and voltage vector diagram to facilitate your solution.S.4) the length of a three-phase power transmission line with a Nominal operating voltage of 69 kV is 16km. The impedance of the transmission line per unit length is 0.125 + j0.4375 ohm/km. From the end of the line, a 56 MW star connected load is fed with a power coefficient of 0.8 back under a 64 kV interphase voltage. If the line head voltage of the transmission line is 69 kV, calculate the capacity and power of the star-connected capacitor to be shunted into the load connected to the end of the line.
- Electric Machine; Check image, all question there. Consider the above approximate equivalent circuit for IM. A six-pole, 220Volt (line to line), 50Hz, Y connected, three phase IM has the following on a per phase basis: R1=0.5Ω , R2=0.25 Ω, X1=0.75 Ω, X2=0.5 Ω, Xm=100 Ω, Rc=500 Ω The friction and windage loss is 150 W. Determine the following at its rated slip of 3.5% a)Total Impedance(Zt) b)Rotor Copper Loss c)Core loss(Pm) d)Shaft Power(P0) e)EfficiencyThe length of a power transmission line is ℓ = 150 km, the unit effective resistance of the line is r = 0.06 Ω/km, x = 0.4 Ω/km and the admittance value of the line is y = j4.10-6 Siemens/km. The end-of-line voltage is 154 kV, the line-head voltage is 170∠10o kV. a) The characteristic impedance of the line b) The power drawn by the load according to the given values c) Calculate the maximum power that the line can transmit?A single phase a. C distributor AB 300mts long if fed from end A is loaded as under a) 100amps at 0.707 p.f lagging 200mts from pointA(b) 200amps at 0.8p.f lagging 300mts from point A. The total resistance and the Reactance and the distributor is0. 2ohms and0. 1ohms per km respectively. Calculate the total voltage drop in the distributor. The load power factors refer to the voltage at the far end
- Characteristics of 165 kV, 150 MVA, 50 Hz 3-phase 100 km transmission linevalues are given below. r=0.103ohm/ kmx=0.525ohm/ kmy=3.3x10^-6 S/ km (a) Calculate the constants A and B for the equivalent circuit of this transmission line,(b) Load lagging power factor of 0.9 when the line is running at nominal (tag) value.if so, find the production side voltage. lesson: Power system analysesA 220 kV, 50 Hz, three-phase transmission line is 60 km long. The resistance per phase is 0.15 ohms/km and the inductance per phase is 1.3 mH per km and the shunt capacitance is negligible. Use the short line model to determine; i) the voltage and power at the sending end ii) voltage regulation and efficiency when the line is supplying a three-phase load of 350 MVA, 220 kV at a power factor of 0.85 lagging.The parameters of the 300 km long line are R=0.1858 Ω/km, L=2.6mH/km and C=0.012μF/km. At the end of the line, the load with 50MVA, 0.85 back power factor is fed at 138kV. This transmission line: a.) Find the line head voltage. b.) Find the line head current. c.) Find the line head power. d.) Find the power factor per line. e.) Find the loss of the line. f.) Find the transmission line efficiency. g.) Find the percent voltage regulation.