Question

In: Electrical Engineering

Three equal impedances, (8+j6) ohms are connected in wye across a three-phase, three-wire supply. The symmetrical...

Three equal impedances, (8+j6) ohms are connected in wye across a three-phase, three-wire supply. The symmetrical components of the phase A line voltages are:

Va0 = 0

Va1 = 220 + j 28.9 V

Va2 = -40 - j 28.9

If there is no connection between the load neutral and the supply neutral, Calculate the symmetrical currents of line a,b, and c.

Solutions

Expert Solution


Related Solutions

An unbalanced wye connected wye connected load of three phase resistances with Ra=60 ohms, Rb=40 ohms...
An unbalanced wye connected wye connected load of three phase resistances with Ra=60 ohms, Rb=40 ohms and Rc=80 ohms is connected to a 440V, negative sequence, balanced 3 phase, 3 wire supply. Calculate the complex power using the method of symmetrical components. Please show all steps and clearly show all answers.
An unbalanced three-phase wye-connected and grounded load is connected to a balanced three-phase four-wire source. The...
An unbalanced three-phase wye-connected and grounded load is connected to a balanced three-phase four-wire source. The load impedances are Za = 14+j3 Ω , Zb = 5-j24Ω and Zc =1+j14 Ω  and the phase a line voltage has an effective value of 18 Kv: use line-to-neutral voltage of phase A as a reference. Find the line and neutral current, also find the reactive power delivered to load and power factor.
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 ii. Total apparent power (1 mark) iii. The impedance of each coil. c) If the coil in Q3(b) are now connected in delta to the same three-phase supply, calculate the magnitude of...
A balanced three-phase delta-connected load is connected to a balanced three-phase delta-connected source via a transmission...
A balanced three-phase delta-connected load is connected to a balanced three-phase delta-connected source via a transmission line. The line-line voltage for the source is 100∟0° V/phase and the impedance of load is (27 + j18) Ω/phase. The transmission line has an impedance of (1 + j4) Ω/line. a) Draw the complete schematic of the power system showing the location of wattmeters. (Two-Wattmeter system is considered for this problem). Phase “a” could be considered as a reference phase. b) What must...
A 3phase,400V sourcesupplies a delta connected load having phase impedances Zab=25? 0º ohms, Zbc=25?30º ohms, and...
A 3phase,400V sourcesupplies a delta connected load having phase impedances Zab=25? 0º ohms, Zbc=25?30º ohms, and Zca=25?-30º ohms. The magnitude of all the phase currents is ____ A.
A three-phase balanced star load No. 1 of (120 +j90) ohms in parallel with another three-phase...
A three-phase balanced star load No. 1 of (120 +j90) ohms in parallel with another three-phase balanced star load No. 2 of (90 +j120) ohms, both are fed by three-phase balanced conductors of 3 ohms resistance and 4 ohms reactance. If the generator is 240 volts, with angle of -150° on phase c and reactance of 1 ohms, determine: a) the current on load N°1 on phase C, b) the terminal voltage of the generator on phase B, c) the...
A balanced positive-sequence wye-connected 60-Hz three-phase source has line-to-line voltages of VL = 440 V rms....
A balanced positive-sequence wye-connected 60-Hz three-phase source has line-to-line voltages of VL = 440 V rms. This source is connected to a balanced wye-connected load. Each phase of the load consists of a 0.5-H inductance in series with a 50-? resistance. Assume that the phase of Van is zero. A) Find the line-to-neutral voltage phasor Van. Enter your answer using polar notation. Express argument in degrees. B) Find the line-to-neutral voltage phasor Vbn. Enter your answer using polar notation. Express...
Three resistors of 20, 50 and 60 ohms are connected to a battery having an emf...
Three resistors of 20, 50 and 60 ohms are connected to a battery having an emf of 15 volts. Draw the circuit diagram and determine the total resistance, the total and individual currents, total and individual voltages if the resistors are connected in series.
A 280-V, 3Ø AC power system, Y-connected three-phase generator connected through a three-phase transmission line to...
A 280-V, 3Ø AC power system, Y-connected three-phase generator connected through a three-phase transmission line to a Y-connected load. The transmission line has an impedance of (0.02+j0.4) Ω/phase, and the load has an impedance of (4+j3) Ω per phase. Determine the;(a)line current (IL) at the load [2Marks] (b)line and phase voltage of the load[2 Marks](c)active power, reactive and apparent power [2 Marks](d) power factor and specify whether it is lagging or leading. [4 Marks]
In a three-phase circuit the balanced delta load of (36 +j54) ohms is fed by impedance...
In a three-phase circuit the balanced delta load of (36 +j54) ohms is fed by impedance conductors (5 +j70) ohms. If the generator voltage is 120 V angle 0° phase A, calculate a) the bc voltage on the load, b) the powers in the conductors, c) the bc voltage of the delta load and d) the power delta on the load.
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT