Explain the loading characteristics of a three-phase alternator in capacitive, resistive and inductive. Please indicate the voltage, current and power relationship in each load condition. Lastly, also explain the power factor relationship. Answer in paragraph form or bullet form. Thanks
Explain the loading characteristics of a three-phase alternator in capacitive, resistive and inductive. Please indicate the...
h Dnd the single-phase load produce an unbalance? C Yes No REVIEW QUESTIONS 1. Explain why the alternator output voltage increases with capacitive loading.(4) Could it be dangerous to connect an alternator to a long transmission line, if the line looks like a capacitor? Explain. (4) 2. Yes D No 3. The rotor of an alternator, at rated power, dissipates more heat at a low power factor (lagging) load than a high power factor load. Explain. (4) 4. If an...
Task 1 (10 Marks) A single phase inductive-resistive-capacitive (LRC) series load is energised from a 240V, 50Hz supply as shown in Fig. Q1. LRC n Fig. Q1 The supply current is measured as supply and the power factor of the LRC load is found to be cose leading. The capacitance value C is known, however the resistance R and inductance L are unknown. The values for supplycosa and Care to be obtained from the excel spread sheet as explained in...
e. A three phase generator turning at 1500 rpm has a terminal voltage of 15 kV, 50 Hz. If the synchronous reactance is 5 per phase, calculate the generated voltage if the following are connected to its terminals: i. Resistive load is 12 MW (5 marks) ii. Inductive load is 12 MVAR (5 marks) iii. Capacitive load is 12 MVAR. (5 marks) f. How will the generated voltage be affected in each of the case (a), (b) & (c) above?...
If a three-phase load is a pure reactive load, then the power calculated has units of _____. A delta-connected three-phase alternator is driving a wye-connected resistive load. The alternator output voltage is 480 V. The load resistors are 12 W each. What is the phase current in the alternator?
A single phase line possesses an inductive reactance X of 20 ohms and its connected to a fixed sender voltage of 2000 V. If it is fully compensated, calculate the following: a. The maximum active power that the line can deliver to a resistive load in kW. b. The value of the line current in item (a) (polar form) c. The capacitive reactance that must be installed on the receiver side when the active power is 80 kW.
A 400 v, 50 Hz, three phase alternator, rated at 75 kVA, is star connected and driven at 1000 r/min. The windings of the alternator have a resistance, per phase, of 0.03 Ω and synchronous reactance, at 50 Hz per phase, of j0.325 Ω. The stator of the alternator has 108 slots, with 8 conductors, per slots, in a double layer. The maximum pole flux is 8.772 x 10-3 Wb. To improve the wave form only 80% of the pole...
A 36 MVA, 20.8 kV, 3-phase alternator has a synchronous reactance of 9 Q and a nominal current of 1 kA. The no-load saturation curve giving the relationship between Eo and I, is given in Fig. 13b. If the excitation is adjusted so that the terminal voltage remains fixed at 12 kV, calculate the exciting current required and draw the phasor diagram for the following conditions: No-load а. b. Resistive load or 36 MW Capacitive load of 12 Mvar C....
1- A 25-kVA, 3-phase, wye-connected, 400-V alternator has a synchronous reactance of 1.6 ohms per phase. The alternator is to have zero voltage regulation at half-load. Neglecting the armature resistance, find the operating power factor and the developed power 2. A 500-kVA, 3600-V, 3-phase, 60-Hz alternator has an effective armature resistance per phase of 0.40 ohm Mechanical and iron losses is 10 kW, field current at full load unity power factor is 70 A. The exciter voltage is constant at...
A three-phase load of 15 kVA with a PF of 0.8 lagging is connected in parallel with a three-phase load of 36 kW at 0.6 PF leading. The line-line voltage is 2000V. a) Find the total complex power and power factor. Is it inductive or capacitive? b) How much kVAR is needed to make the PF unity? c) What is the magnitude of the current going into the total load?
5 Three inductive coils each of inductance 45mH are connected in star to a 3 phase 400V, 50 Hz supply. Calculate the inductance of each coil, which when connected in delta to take the same supply voltage and line current, also find the power delivered at unity power factor for both star and delta connected load. (6 Marks)