. A 2300 V, With 2500 kVA three phase delta-connected alternator has a resistance of 0.1 ohm/phase and a synchronous reactance of 1.5 ohms/phase. The alternator is adjusted to rated voltage at no load. Calculate its terminal voltage when carrying rated current at no load power factor of 0.6 lagging.

A 39.6 kV, 6 MVA star connected alternator has a reactance of 1.5 ohm per phase and negligible resistance. Merz-Price protection scheme is used which operates when the out of balance current exceeds 35% of the full load current. The neutral of the generator is grounded through a resistance of 16 ohms. Determine the proportion of the winding which remains unprotected against earth fault. Show that the effects of the alternator reactance can be ignored.

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If the load is connected to the generator thgrough an inductive line and the voltage at the load side is the same as the voltage at the terminals of the generator, which of the following must be true? O A. The reactive power is flowing from the generator to the load and from load to the generator at the same time. O B. The load is disconnected, and no power is delivered to the load. O C. The load has a poor power factor and it's absorbing too much reactive power. O D. None of the other choices are correct O E. The generator is unable to produce reactive power; therefore, the reactive power is flowing from the load to the generator.

A synchronous generator is rated 645 MVA, 24 kV, 0.9 pf lagging. It has a synchronous reactance 1.2 . The generator is feeding full load at 0.9 pf lagging at rated voltage. Calculate: (a) Excitation emf (E,) and power angle 8 (b) Reactive power drawn by the load Carry out calculations in pu form and convert the result to actual values.

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1. A three phase alternator has generated EMF per phase at 230 V with 10 percent third harmonic and 6 % fifth harmonic content. Calculate the RMS line voltage for a) star connection b) delta connection. Find also the circulating current in delta connection if the reactance per phase of the machine at 50 hz is 10 0.

A 1500KVA, 8KV, three-phase wye-connected alternator has an effective resistance of 0.502 and a reactance of 62 per phase. It delivers full-load current at 0.8 lagging power factor at rated voltage. What will be the terminal voltage for the same excitation and load current, if the power factor is 0.8 leading?

A straight-line law connects terminal voltage and load of a 3-phase star connected alternator delivering current at 0.8 power factor lagging. At no-load, the terminal voltage is 3,500 V and at full-load of 2,280 kW, it is 3,300 V. Calculate the terminal voltage when delivering current to a 3-phase, star-connected load having a resistance of 8 o and a reactance of 6 ohm per phase. Assume constant speed and field excitation.

An 11-kV, 1000-kVA, 3-phase, Y-connected alternator has a resistance of 2 0 per phase. The open-circuit and full-load zero power factor characteristics are given below. Find the voltage regulation of the alternator for full load current at 0.8 p.f. lagging by Potier method? Field current 40 50 110 140 180 (A) O.C.C. 3350 4000 7200 7900 8650 voltage(V/ph) zero p.f. load 860 4900 6000 7200 voltage(V/ph)