Exp. (A) Determine the sequence components of the voltages Va = 180 L00 V an V=150L108°V and V = 200L245ºV. Exp. (B) In a three phase system, la₁ = 90 L30° A and Ib2 = 40L90°A and = Ico : 20L-40° A. Find the line currents.
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- One advantage of balanced three-phase systems over separate singlephase systems is reduced capital and operating costs of transmission and distribution. (a) True (b) FalseTwo 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.It is stated that (i) balanced three-phase circuits can be solved in per unit on a per-phase basis after converting - load impedances to equivalent Y impedances. (ii) Base values can be selected either on a per-phase basis or on a three-phase basis. (a) Both statements are true. (b) Neither is true. (c) Only one of the above is true.
- Van = 330∠510°, Vbn = 330∠270°, Vcn = 330∠390°" A POSITIVE PHASE SEQUENCE B NEGATIVE PHASE SEQUENCEA balanced three-phase Y-source with Vph=221 vrms drives a Y-connected three-phase load with phase impedance Za=84 Ohm, Zb=2+j11 ohm, and Zc=j84 ohm. Calculate the line currents and total complex power delivered to the load. Assume that the neutrals are connected.A 400V three-phase, four wire system has the following loads connected: Phase 1: load impedance Z1 = 40 + j15 Ω Phase 2: load impedance Z2 = 60 Ω Phase 3: load impedance Z3 = 15 – j20 Ω I am just looking for the working out for phase 2 - please ignore the other phases The line and phase voltages for all phases (including phase angles) The line and phase currents for all phases (including phase angles) The neutral current (including phase angle)
- A balanced three-phase source with grounded neutral has line-to-line voltages of 236 volts with ab-bc-ca sequence. It supplies power to an unbalanced three-phase delta load with impedances: Zab = 72 cis 69; Zbc = 90 cis -64; Zca = 53 cis 22 ohms. Determine the magnitude of the line current, Ia amperes.A balanced, three-phase circuit is characterized as follows: Y-Δ connected; Source voltage in the b-phase is 150 135 ∘ V; Source phase sequence is acb; Line impedance is 2+j3 Ω/ϕ; Load impedance is 129+j171 Ω/ϕ. 1. a) Draw the single phase equivalent for the a-phase. 2. b) Calculate the a-phase line current. 3. c) Calculate the a-phase line voltage for the three-phase load.16) In a balanced three-phase Y-Y system, the source is an abc sequence of voltages and Van = 139∠12° Vrms. The line impedance per phase is 1.1 + j1.9Ω , while the per-phase impedance of the load is 7 + j13Ω . Calculate the magnitude of the voltage drop across the load of phase-b (in Vrms).
- The one-line diagram of a three-phase power system is as shown in the figure attached. Impedances are marked in per unit on a 100-MVA, 400-kv base. The load at bus 2 is S(sub 2) = 15.93 MW - j33.4 Mvar, and bus 3 is S(sub 3) = 77MW + j14 Mvar. I tis required to hold the voltage at bus 3 at 400 angle 0 degrees kV. Working in per unit, determine the voltage at buses 2 and 1.An unbalanced delta connected load is delivered by a three-phase system whose phase sequence is ABC. LOAD AB is 12 < 0o A, load BC is 12 < 30o A, and load CA is 16 < -30o A. Calculate the line currents Ia, Ib, and Ic. Assume VAB as the reference voltage. ANSWER THIS ASAP PLSSS1. A balanced three-phase Y-source with Vph = 211 V rms drives a Y-connected three-phase load with phase impedance ZA= " 72", ZB= 7+j9, and ZC=j64 . Calculate the line currents and total complex power delivered to the load. Assume that the neutrals are connected.