12.13 In the balanced three-phase Y-A system in Fig. 12.46, # find the line current I, and the average power delivered ML to the load. 110/0° V rms 252 9-j6 Q2 110-120° V rms 202 + www 9-j6 Q2 9-j6 Q2 110/120° V rms 202 www
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- A balanced three-phase 240-V source supplies a balanced three-phase Load. If the line current IA is measured to be 15 A and is in phase with the line-to-line voltage, VBC, find the per-phase load impedance if the load is (a) Y-connected, (b) -conneeted.Two balanced three-phase loads that are connected in parallel are fed by a three-phase line having a series impedance of (0.4j2.7) per phase. One of the loads absorbs 560 kVA at 0.707 power factor lagging, and the other 132 kW at unity power factor. The line-to-line voltage at the load end of the line is 2203V. Compute (a) the line-to-line voltage at the source end of the line. (b) the total real and reactive power losses in the three-phase line, and (c) the total three-phase real and reactive power supplied at the sending end of the line. Check that the total three-phase complex power delivered by the source equals the total three-phase comp lex power absorbed by the line and loads.Figure 2.33 gives the general -Y transformation. (a) Show that the general transformation reduces to that given in Figure 2.16 for a balanced three-phase load. (b) Determine the impedances of the equivalent Y for the following impedances: ZAB=j10,ZBC=j20, and ZCA=j25. ZAB=ZAZB+ZBAC+ZCZAZCZA=ZABZCAZAB+ZBC+ZCAZBC=ZAZB+ZBAC+ZCZAZAZB=ZABZBCZAB+ZBC+ZCAZCA=ZAZB+ZBAC+ZCZAZBZA=ZCAZBCZAB+ZBC+ZCA
- Consider a three-phase Y-connected source feeding a balanced- load. The phasor sum of the line currents as well as the neutral current are always zero. (a) True (b) FalseA balanced delta connected load of 13+j16 ohm per phase is connected at the end of a three-phase line. The line impedance is 2+j11 ohm- per phase. The line is supplied from a three-phase source with a line-to-line voltage of 207.85 Vrms. Taking phase "a" voltage Va as reference, determine the following: (a) Current in phase a. (b) Total complex power supplied from the source. (c) Magnitude of the line-to-line voltage at the load terminal.A balanced three-phase source with grounded neutral has line-to-neutral voltages of 132.7906 volts with an-bn-cn sequence. This source has an internal series impedance of 0.2+j2.5 ohms per phase. It supplies power to an unbalanced three-phase wye, neutral grounded, load with impedances: Zan = 18-j10; Zbn = 15+j25; Zcn = 20+j30 ohms. If there is a line-to-line fault at lines b and c load-side, what is the magnitude of the fault current in amperes?
- 3. A balanced delta connected load of "17+j18 - per phase is connected at the end of a three-phase line. The line impedance is 7+j9 - per phase. The line is supplied from a three-phase source with a line-to-line voltage of 207.85 Vrms. Taking phase "a" voltage Va as reference, determine the following: (a) Current in phase a. (b) Total complex power supplied from the source. (c) Magnitude of the line-to-line voltage at the load terminal.A balanced three-phase source with grounded neutral has line-to-neutral voltages of 132.7906 volts with an-bn-cn sequence. This source has an internal series impedance of 0.2+j2.5 ohms per phase. It supplies power to an unbalanced three-phase wye, neutral grounded, load with impedances: Zan = 18-j10; Zbn = 15+j25; Zcn = 20+j30 ohms. If line a is open creating a series fault at line load-side, what is the magnitude of the line current in line b in amperes?A balanced three-phase source with grounded neutral has line-to-neutral voltages of 120 volts with an-bn-cn sequence. This source has an internal series impedance of 0.1+j1.5 ohms per phase. It supplies power to an unbalanced three-phase wye, neutral grounded, load with impedances: Zan = 40+j30; Zbn = 36-j15; Zcn = 18+j24 ohms. If there is a single-line-to-ground fault at line a load-side, what is the magnitude of the fault current in amperes?
- For balanced Y - ∆ connected three-phase system, at 60 Hz during generator positive phaseIt provides 230 V nominal rms line voltage. Balanced load from three identical impedances ZAB = ZBC = ZCA=It consists of 20∠45 °. All generator and line impedances can be neglected. Power supplied to the load, all phase anddetermine load voltages and line currents? (Note = take = 230∠30 ° V)A balanced three-phase source with grounded neutral has line-to-neutral voltages of 230 volts with an-bn-cn sequence. This source has an internal series impedance of 0.15+j2.0 ohms per phase. It supplies power to an unbalanced three-phase wye, neutral grounded, load with impedances: Zan = 15+j20; Zbn = 20-j16; Zcn = 26+j10 ohms. If there is a three-phase fault at line load-side, what is the magnitude of the fault current in amperes?1. A balanced three-phase Y-source with Vph = "224" V rms drives a Y-connected three-phase load with phase impedance ZA " 87" ohm. ZB = "7+J12" ohm and ZC "J61" ohm . Calculate the line currents and total complex power delivered to the load. Assume that the neutrals are connected.