Three 20micro F capacitors are star-connected across a 400V, 50Hz, three-phase, three-wire supply. a) Calculate the...
Three 20micro F capacitors are star-connected across a 400V, 50Hz, three-phase, three-wire supply. a) Calculate the current in each line. b) If one of the capacitors is short-circuited, calculate the line currents. c) If one of the capacitors is open-circuited, calculate: (i) the line currents, (ii) the p.d. across each of the other two capacitors.
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Three 20micro F capacitors are star-connected across a 400V,
50Hz, three-phase, three-wire supply. a) Calculate the...
A three-phase 400V, star-connected motor has an output of 50kW, with an efficiency of 90 per...
A three-phase 400V, star-connected motor has an output of 50kW, with an efficiency of 90 per cent and a power factor of 0.85. Calculate the line current. Sketch a phasor diagram showing the voltages and the currents. If the motor windings were connected in mesh (delta), What would be the correct voltage of a three-phase supply suitable for the motor?
The parameters of a 400V, 50Hz, three phase star connected induction motor are: Stator impedance ?1...
The parameters of a 400V, 50Hz, three phase star connected induction motor are: Stator impedance ?1 = 1.7 + ?4 ohm/phase Referred rotor impedance ?2 ′ = 1.2 + ?2.6 ohm/phase Magnetizing impedance ?0 = 5 + ?60 ohm/phase Determine the torque at a slip of 5% using : a) The exact equivalent circuit b) The approximate equivalent circuit
b) The load connected to a three-phase supply comprises three similar coils connected in star. If...
b) The load connected to a three-phase supply comprises three similar coils connected in star. If the phase currents are 10A and the total active power and power factor absorb by the loads are 3kW and 0.8 lagging, respectively. Find: i. The magnitude of phase and line voltages (4 marks) ii. Total apparent power (1 mark) iii. The impedance of each coil. (2 marks) c) If the coil in Q3(b) are now connected in delta to the same three-phase supply,...
Three similar inductors, each of resistance 10 ohm and inductance 0.019H, are delta-connected to a three-phase,...
Three similar inductors, each of resistance 10 ohm and inductance 0.019H, are delta-connected to a three-phase, 400V, 50Hz sinusoidal supply. Calculate: (i) the value of the line current, (ii) the power fator, (iii) the active power input to the curcuit.
5 Three inductive coils each of inductance 45mH are connected in star to a 3 phase...
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)
7. Three 100 Ω non-inductive resistances are connected in (a) star and (b) delta across a...
7. Three 100 Ω non-inductive resistances are connected in (a) star and (b) delta across a 400 V,60 Hz, 3-phase mains. Calculate the power taken from the supply system in each case. In the event of one of the three resistances getting open-circuited, what would be the value of active power taken from the mains in each of the two cases? Tip: Consider drawing the circuit for better insights.)
A three-phase balanced wye connected source with a line voltage of 400v supplies a balanced delta...
A three-phase balanced wye connected source with a line voltage of 400v supplies a balanced delta connected load with the impedance of each phase ?∆ = 60∠450Ω. The impedance of the threephase line connecting the source and the load is ?l = 2∠300Ω/phase. Calculate the line current and phase current magnitudes of the load. Also find real and reactive power at the terminals (abc) of the load and at the terminals (ABC) of the source.
A 3-phase 4 wire symmetrical (balanced) Y-connected source with line voltage 340V (take the phase of...
A 3-phase 4 wire symmetrical (balanced) Y-connected source with
line voltage 340V (take the phase of VanVan to be 0 degrees) feeds
an unbalanced three phase load formed by the impedances
ZY1=14+j(14)Ω, ZY2=7+j(11)Ω and ZY3=20+j(−14)Ω connected in a Y
(a.k.a. “star”, or a “tee”) configuration. Find the line currents,
neutral current (current in the fourth “return” wire), and active
power in each phase.
(20 points) A 3-phase 4 wire symmetrical (balanced) Yconnected source with line voltage 340V (take the phase...
ELE2601/101/3/2019 QUESTION 4 A 400 V three-phase, 50 Hz system, ABC sequence supplies the following loads: A star-connected load with the following phase impedances: A delta-connected load of eq...
ELE2601/101/3/2019 QUESTION 4 A 400 V three-phase, 50 Hz system, ABC sequence supplies the following loads: A star-connected load with the following phase impedances: A delta-connected load of equal phase impedances: Use VAB as reference and determine the following quantities: 4.1 The magnitude and angle of the currents drawn by the star-connected load (IAN; lBN; ICN). 4.1.1 The magnitude and angle of the phase (IAB; lBc; ICa) and line (lA; ls; Ic) currents drawn by the delta-connected load. 4.1.2 (12)...
A three-phase generator connected in star generates a phase voltage of Vθ = 220 Vrms and supplies a three-phase load also connected in star. The three phases of the generator are connected to the thre...
A three-phase generator connected in star generates a phase
voltage of Vθ = 220 Vrms and supplies a three-phase load also
connected in star. The three phases of the generator are connected
to the three loads shown Remember that the return of the current of
each charge is through the Neutral.
a) Calculate the phase, line, load and neutral currents
b) Calculate the phase, line and load voltages
c) Calculate the powers of Apparent (S), Real (P) and Reactive (Q)...
b) The load connected to a three-phase supply comprises three similar coils connected in star. If the phase currents are 10A and the total active power and power factor absorb by the loads are 3kW and 0.8 lagging, respectively. Find: i. The magnitude of phase and line voltages (4 marks) ii. Total apparent power (1 mark) iii. The impedance of each coil. (2 marks) c) If the coil in Q3(b) are now connected in delta to the same three-phase supply,...
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)
7. Three 100 Ω non-inductive resistances are connected in (a) star and (b) delta across a 400 V,60 Hz, 3-phase mains. Calculate the power taken from the supply system in each case. In the event of one of the three resistances getting open-circuited, what would be the value of active power taken from the mains in each of the two cases? Tip: Consider drawing the circuit for better insights.)
A 3-phase 4 wire symmetrical (balanced) Y-connected source with
line voltage 340V (take the phase of VanVan to be 0 degrees) feeds
an unbalanced three phase load formed by the impedances
ZY1=14+j(14)Ω, ZY2=7+j(11)Ω and ZY3=20+j(−14)Ω connected in a Y
(a.k.a. “star”, or a “tee”) configuration. Find the line currents,
neutral current (current in the fourth “return” wire), and active
power in each phase.
(20 points) A 3-phase 4 wire symmetrical (balanced) Yconnected source with line voltage 340V (take the phase...
ELE2601/101/3/2019 QUESTION 4 A 400 V three-phase, 50 Hz system, ABC sequence supplies the following loads: A star-connected load with the following phase impedances: A delta-connected load of equal phase impedances: Use VAB as reference and determine the following quantities: 4.1 The magnitude and angle of the currents drawn by the star-connected load (IAN; lBN; ICN). 4.1.1 The magnitude and angle of the phase (IAB; lBc; ICa) and line (lA; ls; Ic) currents drawn by the delta-connected load. 4.1.2 (12)...
A three-phase generator connected in star generates a phase
voltage of Vθ = 220 Vrms and supplies a three-phase load also
connected in star. The three phases of the generator are connected
to the three loads shown Remember that the return of the current of
each charge is through the Neutral.
a) Calculate the phase, line, load and neutral currents
b) Calculate the phase, line and load voltages
c) Calculate the powers of Apparent (S), Real (P) and Reactive (Q)...
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