2.41 A three-phase 25-kVA, 480-V, 60-Hz alternator, operating under bal- anced steady-state conditions, supplies a line current of 20 A per phase at a 0.8 lagging power factor and at rated voltage. Determine the power triangle for this operating condition.
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A: Given : XL=0.15 ΩXD=0.24 ΩXF=0.44 ΩXa=0.7 Ω Step 1 : Calculate transient reactance Transient…
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Q: QUESTION 1:- (a) A 4-pole, 3-phase, star-connected, 50 Hz synchronous generator, with a…
A: “Since you have asked multiple questions, we will solve the first question for you. If you want any…
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A: Note :- as per guidelines only the first question can be solved, kindly re post the other questions…
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A: You have posted multiple questions, so I am solving the 1st questions for you 1) Based on the given…
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Q: A three-phase alternator of 4 poles and 60 HZ, connected in star of 100 KVA and 1100 volts is tested…
A: “Since you have posted a question with multiple sub-parts, we will solve the first three sub-parts…
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A: The solution is given below
Q: A 3-phase, Y connected, round rotor synchronous generator rated at 10KVA, 220V has a Synchronous…
A: i have explained in detail
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Q: A three-phase 25-kVA, 480-V, 60-Hz alternator, operating under balanced steady state conditions,…
A: Given, S=25 kVAVL=480 Vf=60 HzPF=0.8 lagIL=20 A
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A: i have explained in detail
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- Consider two interconnected voltage sources connected by a line of impedance Z=jX, as shown in Figure 2.27. (a) Obtain expressions for P12 and Q12. (b) Determine the maximum power transfer and the condition for it toShow that an alternator running in parallel on constant-voltage and frequency bus-bars has a natural time period of oscillation. Deduce a formula for the time of one complete oscillation and calculate its value for a 5000-kVA, 3-phase, 10,000-V machine running at 1500 r.p.m. on constant 50-Hz bus-bars. The moment of inertia of the whole moving system is 14,112 kg-m2 and the steady short-circuit is five times the normal full-load value. ANSWER IS [1.33 second]A 3-phase, star -connected turbo-alternator, having a synchronous reactance of 10 Ω per phase and negligible armatureresistance, has an armature current of 220 A at unity p.f. The supply voltageis constant at 11 kV at constant frequency. If the steam admission is unchangedand the e.m.f. raised by 25%, determine the current and power factor.
- Two 50-MVA, 3-phase alternators operate in parallel. The settings of the governors are such that the rise in speed from full-load to no-load is 2 percent in one machine and 3 percent in the other, the characteristics being straight lines in both cases. If each machine is fully loaded when the total load is 100 MW, what would be the load on each machine when the total load is 60 MW? (Req'd) Draw an appropriate diagram.If, in a 3-φ alternator, a field current of 50Aproduces a full-load armature current of 200 Aon short-circuit and 1730 V on open circuit, then its synchronous impedance is ....... ohm.A 3-Phase 10Kva, 400 V, 50Hz star connected alternator supplies a rated load at 0.8 power factor lagging. If the armature resistance per phase is 0.5Ჲ and the synchronous reactance is 10Ჲ, using the e.m.f method, estimate the alternator’s voltage regulation
- The effective resistance of a 2200 V, 50 Hz, 440 KVA, 1 -phase alternator is 0.5 ohm. On short-circuit, a field current of 40 A gives the full load current of 200 AS. The electromotive force on open-circuits with same field excitation is 1160 V. Then the synchronous impedance and reactance is _______ ohm and _______ ohm respectively.An 11 kV, three-phase, turbo alternator has a synchronous impedance per phase of(0,4 + j0,8) Ω and it supplies 2 kA at unity power factor to an infinite bus. Theexcitation is increased so that the emf is increased by 20%. Sketch a general loaddiagram and determine the following from this diagram: the armature current for maximum power output, the actual maximum power outputDiscuss about Generator modeling in transient stability and derive the formula for the real and reactive power supplied by it.
- a) With the aid of a diagram and phasor diagram, explain the double-reactance concept for salient-pole alternators. b) 3-phase star-connected synchronous generator supplies a current of 10A having phase angle of 20° lagging 400V (phase voltage). Given the direct and quadrature axis reactances as 10ohms and 6.5ohms respectively and neglecting armature resistance, Find: 1. The load angle 2 The direct and quadrature components of armature currents 3. Voltage regulationQ2)A. Explain compound DC generator, also describe its types and terminal characteristics of compound DC generator. proper explanation and diagramA 500-V, 50-kVA, single-phase alternator has an effective resistance of 0.2 Ω. A field current of 10A produces an armature current of 200A on short-circuit and emf of 450V on open circuit. Calculate (a) the synchronous impedance and reactance and (b) the full-load regulation with 0.8 p.f. lagging.