Main elements of Electric Power System except A. Electricity Generation B. Single Phase Transformer Transmission Line D. Distribution System
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- Consider a 3-phase transmission line operating at 66 kV and connected through a 1000 KVA transformer with 5% reactance to a generating station bus-bar. The generator is of 2500 kVA with 10% reactance. The single line diagram of the system is shown in Figure beside. Suppose a short-circuit fault between three phases occurs at the high voltage terminals of transformer. Suppose we choose 2500 kVA as the common base kVA. The fullt load current corresponding to 2500 kVA base at 66 kV in ampere is: 2500 VA 10% Select one A 21 87 B. 131 22 CC 227 27 D.37.57 A11 PM wwww8. A 1000-kV and a 500-kVA, 1-phase transformers are connected to the same bus-bars on the primary side. The secondary e.m.fs at no-load are 500 and 510 V respectively. The impedance voltage of the first transformer is 3.4% and of the second 5%. What cross-current will pass between them when the secondaries are connected together in parallel? Assuming that the ratio of resistance to reactance is the same in each, what currents will flow in the windings of the two transformers when supplying a total load of 1200 kVA. [(a) 290 A (b) 1577 and 900 A]Q1:- What is the influence of transformer connections in single-phase transformers connected for 3- phase operation. Q2:- Prove that neutral current can flow only if zero-sequence currents are present.
- A 50 MVA 230/115-kV, A-Y three-phase connected power transformer has a per unit resistance of 0.015 pu and a per-unit reactance of 0.006 pu. The excitation branch elements are Rc = 125 pu and Хм - 20 ри. What is the equivalent branch resistance, Rc, in kQ referred to the low-voltage side?No-load operation and short circuit tests were performed on three-phase, 50 Hz 480/220 delta / Y connected transformer. In these testsThe line voltage, line current and three-phase total power have been measured from the high voltage windings and the test results are below.pictures. 100 A DC current when 1.08 V DC voltage from non-transferable software is applied to the low voltage windingshas attracted.Find the single phase equivalent circuit parameters of this transformer.idle test:Voltage: 480V Power:114w current: 0.71Ashort circiut test:V: 10v P: 78w c: 18.3aThe 3-phase transformer, consisting of three single-phase transformers, increases the three-phase generator voltage of 13.8 kV (line voltage/interphase voltage) to a distribution voltage of 138 kV (line voltage/interphase voltage). The rated power of the generator is 41.5 MVA. For the Low Voltage side of this 3-phase transformer to be connected to Star, the High Voltage side to Delta, find the phase current value of the high voltage side of the transformer. O 1736.2000 A 312.6000 A 1278.3175 A 200.1239 A O 173.6235 A 1672.1376 A O 100.2415 A O 1002,4000 A
- A 130-MVA,13.2-kV three-phase generator, which has a positive-sequence reactance of 1.5 per unit on the generator base, is connected to a 135-MVA,13.2/115Y-kV step-up transformer with a series impedance of (0.005+10.1) per unit on its own base. (a) Calculate the per-unit generator reactance on the transformer base. (b) The load at the transformer terminals is 15 MW at unity power factor and at 115 kV Choosing the transformer high-side voltage as the reference phasor, draw a phasor diagram for this condition. (C) For the condition of part (b), find the transformer low-side voltage and the generator internal voltage behind its reactance. Also compute the generator output power and power factor.Three single-phase, two-winding transformers, each rated 450MVA,20kV/288.7kV, with leakage reactance Xeq=0.10perunit, are connected to form a three-phase bank. The high-voltage windings are connected in Y with a solidly grounded neutral. Draw the per-unit equivalent circuit if the low-voltage windings are connected (a) in with American standard phase shift or (b) in Y with an open neutral. Use the transformer ratings as base quantities. Winding resistances and exciting current are neglected.With the same transformer banks as in Problem 3.47, Figure 3.41 shows the oneline diagram of a generator, a step-up transformer bank, a transmission line, a stepown transformer bank, and an impedan load. The generator terminal voltage is 15 kV (line-to-line). (a) Draw the per-phase equivalent circuit, aounting for phase shifts for positive-sequence operation. (b) By choosing the line-to-neutral generator terminal voltage as the reference, determine the magnitudes of the generator current, transmiss ion-line current, load current, and line-to-line load voltage. Also, find the three-phase complex power delivered to the load.
- Consider the oneline diagram shown in Figure 3.40. The three-phase transformer bank is made up of three identical single-phase transformers, each specified by X1=0.24 (on the low-voltage side), negligible resistance and magnetizing current, and turns ratio =N2/N1=10. The transformer bank is delivering 100 MW at 0.8 p.f. lagging to a substation bus whose voltage is 230 kV. (a) Determine the primary current magnitude, primary voltage (line-to-line) magnitude, and the three-phase complex power supplied by the generator. Choose the line-to-neutral voltage at the bus, Va as the reference Account for the phase shift, and assume positive-sequence operation. (b) Find the phase shift between the primary and secondary voltages.Consider Figure 3.4. For an ideal phase-shifting transformer, the imda nce is unchanged when it is referred from one side to the other. (a) True (b) FalseThree single-phase two-winding transformers, each rated 25MVA,54.2/5.42kV, are connected to form a three-phase Y- bank with a balanced Y-connected resistive load of 0.6 per phase on the low-voltage side. By choosing a base of 75 MVA (three phase) and 94 kV (line-to-line) for the high-voltage side of the transformer bank, specify the base quantities for the low-voltage side. Determine the per-unit resistance of the load on the base for the low-voltage side. Then determine the load resistance RL in ohms referred to the high-voltage side and the per-unit value of this load resistance on the chosen base.