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- Two identical three-phase Alternators A and B share equally a load of 10 MVA at 33 KV and 80% lagging power factor. The synchronous reactance of each generator is 4 ohms per phase and the armature resistance is negligible. Alternator A has its field excitation adjusted to carry a25 amperes at lagging power factor. What is the current delivered by Alternator B ?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 outputA 10-kVA, 230-V, three-phase, delta-connected, the synchronous generator has a winding resistance of 0.2 ohms/phase and a synchronous reactance of 0.5 ohms/phase. Determine its voltage regulation when the power factor of the load is (a) 86.6% lagging, (b) 86.6% leading, and (c) unity.
- A three-phase wye-connected wound rotor synchronous generator rated at 10 KVA, 230 v has synchronous reactance of 1.2 ohms per phase and armature resistance of 0.5 ohm per phase. What is the power factor such that the voltage regulation at full-load is zero?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.Draw a complete circuit diagram of 1 phase synchronous alternator including the field excitation circuit. Then, draw the phasor diagram of the generator a general leading power factor. Include the phase resistance in the diagram.
- 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.Derive current, active and reactive power equations of a three-phase synchronous generator along with phasor diagram.380 V, 50 Hz, 2p = 6, star connected induction motor impedance in ohms per phase values:R1 = 0.3, X1 = j0.45, R2 = 0.15, X2 = j0.45, Xm = j15Its total mechanical losses are 500W. Core losses are negligible. For a rotor slip of 0.01 at rated voltage, calculate the following:a. Input currentb. power factorc. rotor frequency
- A three-phase, 13.8 kV, 10 MVA, 0.8 PF-lagging, 60 Hz two-pole, Y-connected steam-turbine generator has a synchronous reactance of 12 Ω per phase and an armature resistance of 1.5 Ω per phase. This generator is operating in parallel with a large power system (innite bus). ONLY ANSWER PART D)a) What is the magnitude of internal voltage Ea at rated conditions?b) What is power angle δ of the generator at rated conditions?c) If the eld current is constant, what is the maximum active power possible out of this generator (taking into account Ra)? How much reserve power does this generator have at full load?d) At the absolute maximum active power possible, how much reactive power will this generator be supplying or consuming? Sketch the corresponding phasor diagram assuming I(f) is still unchanged.A 1500 KVA, star connected 2300v, 3 phase salient pole synchronous generator has reactance ph/95.1xd and phase/40.1xq All losses may be neglected. Find the excitation voltage for operation at rated KVA and power factor of 0.85 lagging.In a Three-phase alternator, a given field current produces an armature current of 250 A on short-circuit and a generated e.m.f. of 1500 V on open-circuit. Calculate the terminal p.d. when a load of 250 A at 6.6 kV and 0.8 p.f. lagging is switched off. Calculate also the regulation of the alternator at the given load. Subject: Electrical engineering