Number 17 NCHRONOUS GENERATORS383keptCalculateage anda. The synchronous impedance Z, per phaseb. The total resistance of the circuit, perphasec. The total reactance of the circuit, perphased. The line currentreac-lo sgs e. The line-to-neutral voltage across thew theloadd ex-f. The line voltage across the loadg. The power of the turbine driving thealternatoreters.xcitations. Usingh. The phase angle between E, and thevoltage across the loadhow the17A 3-phase generator rated 3000 KVA, 20 kV,900 r/min, 60 Hz delivers power to a 2400KVA, 16 kV load having a lagging powerfactor of 0.8. If the synchronous reactance is100 N, calculate the value of E, per phase.excitingad linecO,The generator in Fig. 2 has a synchronousreactance of 0.4 2, per phase. It is con-nected to an infinite bus having a line volt-age of 14 kV, and the excitation voltage is18chro-ationg. 19).E for aageadjusted to 1.14 pu.hasorCalculate1S KAa. The torque angle § when the generatordelivers 420 MWof Eb. The mechanical displacement angle ac. The linear pole shift (measured alongthe inside stator circumference)ivenms.er phasecorresponding to this displacementangle [in]For what19 A test taken on the 500 MVA alternator ofFig. 2 yields the following results:Onen-circuit line voltage is 15 kV for aPower14

In this question, We need to determine the value of voltage per phase if load of the system is…

17 A3-phase generator rated 3000 KVA, 20 kV, 900 r/min, 60 Hz delivers power to a 2400 KVA, 16 kV load having a lagging power factor of 0.8. If the synchronous reactance is 100 N, calculate the value of E, per phase.

17 A3-phase generator rated 3000 KVA, 20 kV, 900 r/min, 60 Hz delivers power to a 2400 KVA, 16 kV load having a lagging power factor of 0.8. If the synchronous reactance is 100 N, calculate the value of E, per phase.

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter3: Power Transformers

Section: Chapter Questions

Problem 3.48P: With the same transformer banks as in Problem 3.47, Figure 3.41 shows the oneline diagram of a...

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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.
Question 3. A three-phase impedance load balanced D a connected load in parallel with a balanced ? connected load made of bonding. D each arm for the load ?D = 6 + 6? and ? each arm for the connected load It is given as ?? = 2 + 2?. ? the connected load ?? = 1? is earthed through the neutral impedance. To this impedance load, the symmetrical component voltages ?0 = 10∠60°, ?1 = 100∠0° and ?2 = Unbalanced phase-to-earth voltages ??, ?? and ?? of 15∠200° volts were applied. a) Draw the zero, positive and negative sequence circuits. b) Find the complex powers imparted to each component circuit.
Three zones of a single-phase circuit are identified in the figure with a generator voltage specification of 240 V. The zones are connected by the transformers T1 and T2, whose ratings are shown below.Using base values of 30 kVA and 240 volts in zone 1, draw the pu circuit and determine the pu impedance and pu source voltage. Then calculate the load current in pu and in amperes.*Round the final answer to four decimal places, polar form, and label it with the correct units.
Sketch the complete per-phase equivalent circuit of a symmetrical non-salient pole three-phase synchronous generator, including the field winding circuit. Your figure should include the synchronous reactance Xs, explain its relation to Xar and Xl. In addition, explain/describe the rest of the different elements of this equivalent circuit.
The one-line diagram of a simple power system is shown in Figure 9.20. Each generator is represented by an an emf behind the transient reactance. All impedances are expressed in per unit on a common MVA base. All resistance and shunt capacitances are neglected. The generation are operating on no load at their rated voltage with their emfs in phase. A three-phase fault occurs at bus 1 through a fault impedance of Z_f = j0.08 per unit. Using Thevenin's theorem obtain the impedance to the point of fault and the fault current in per unit. Determine the bus voltages and line currents during fault.
3. Which one of the following method uses weak coupling between reactive power and voltage angle?. A. Newton - Raphson Method B. Decoupled Method C. Gauss-Seidal Method
A (500 MW) generator is delivering (180 MW) to infinite bus through the unit transformer and double transmission lines. The per-unit ractances for a given system are shown in figure below andall the reactances are based on (100 MW) base. The generator emf is ( 1.35p .u.). Determine whether the system remains stable after one circuit of the lines is switch off?
Three single-phase two-winding transformers, each rated 400 MVA, 13.8/ 199.2 kV, with leakagereactance Xeq = 0.10 per unit, are connected to form a three-phase bank. Winding resistances andexciting current are neglected. The high-voltage windings are connected in Y. A three-phase loadoperating under balanced positive-sequence conditions on the high-voltage side absorbs 1000 MVA at0.90 p.f. lagging, with VAN = 199.2 ∠00 kV. Determine the voltage Van at the low-voltage bus if the lowvoltage windings are connecteda) in Y,b)
A three phase synchronous generator with negligible resistance and Xs=20 ohm has induced voltage as well as terminal voltage per phase equal to 230 V. for the load angle of 30o, power received by the bus is .........W.
Draw an impedance diagram for the electric power system shown in the figure attached, showing all impedances in per unit on a 100-MVA base. Choose 20kV as the voltage base for generator. The three-phase power and line-line ratings are given in the figure attached.
A balanced, star connected three-phase system is directly connected to an unbalanced load, with a solid neutral connection. The line-to-neutral voltage Van on the load side and per phase load impedances (i.e., Za, Zb and Zc) are as below: ?an = 240∠0 ? ?? = 10 + 3? Ω ?? = 16 + 3? Ω ?? = 10 + 3?Ω Draw the circuit diagram and calculate the sequence currents and neutral current
L-type equivalent circuit and parameters for a continuous sinusoidal phase of a 5.5 kW, 1460 rpm, line voltage 220 V and frequency 50 Hz star-connected 3-phase ASM, ignoring core (iron) losses given as follows: R1=0.21 Ohm, R2=0.18 Ohm, X1=X2=0.66 Ohm and Xm=9.9 Ohm How many times the inrush current will be the rated current when the ASM is started directly? Answer options group 3.7473 5.2280 8.0815 7.1534 1.2558 4.3763 2.6455 6.3414