3. Find the voltages. Van=1200/10 Ve Vab = 1200/10 V₂
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3. Find the Voltages
4. If the impedance of each leg of the load is 2+j2 ohms. Find the 3-phase power consumed by the loads.
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- What is the main direct cause of reactive power in AC system?A. Resistance of transmission linesB. Inductance and capacitance in the loadsC. Ideal transformer connected in the systemD. Power produced by generator2. “Reactive power in a system is dissipated generally as thermal energy?”A. TRUEB. FALSE3. Which of the following statements are correct for three phase circuit:A. Sum of all the three phase currents is zero in unbalanced networkB. Total power transfer to load is constant with timeC. Neutral conductor is same size in terms of material used as in single phase conductorsD. Net apparent power consumed is equal to real powerSolve all parts or will dislike For the following circuit, the source voltage phasor is: ?s = 250.7∠ -4.16 deg ? a) Calculate the equivalent workshop impedanceb) Deduce the value of the phasor ?c) Calculate the voltage at the workshop terminals using the ohm lawd) Calculate the voltage at the workshop terminals using the law of loopse) Determine the real and reactive powers of the workshop and its power factor solve all parts or will dislikeA balanced 3-phase load of 23.5 MVA with PF=0.85 lagging is supplied with a balanced 3-phase source of 12.5 kV (line-to-line). Determine: VLL, IL, and VLN, The phase angle between phase voltage and current, θ, S3ϕ, S3ϕ, P3ϕ, and Q3ϕ, ZY if load is wye and ZΔ if load is delta, What size capacitor bank (in kVAR) would need to be installed to increase the PF to 0.9 lagging.
- 1. Three impedances Z1, Z2 and Z3 are delta-connected to a symmetrical 3-phase, 400 V supply of phase sequence RYB. Z1 = (8 – j 6) Ω and is connected between lines R and Y. Z2 = (6 + j 8) Ω and is connected between lines Y and B. Z3 = (10 + j 0) Ω and is connected between lines B and R. Calculate (i) line and phase currents (ii) power per phase (iii) total power. Verify the results by creating a MATLAB Simulink model and program. Obtain the plots for the currents and voltages. Repeat for a case when the same loads are now connected in star.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 balance 3-phase, inductive delta-connected load is connected to a balance 3-phase, 100V, abc source. Two-wattmeter method is used to determine the total power of this delta load. Wattmeter 1 (W1) and wattmeter 2 (W2) are connected in lines a and c respectively. If W2 reads 900 watts and the power factor of the load is 80%, what will be reading in W1 reading in watts?
- Three parallel three-phase loads are supplied from a 207.85-Vrms, 60-Hz three-phase supply. The loads are as follows: Load 1: 8 kW with 0.6 lagging power factor. Load 2: Resistive load of 8 kW. Load 3: capacitor load of 22 kvar. (a) What is the total system kW, kvar, power factor, and the supply current per phase? (b) What is the system power factor and the supply current per phase when the Load-1 and Load-2 are operating but the Load-3 is switched off?Consider a 10 kVA, 200/400 V, 50 HZ: single-phase tranformer has the folloving test results:0.C. test: 200 V, 0.6A, 63 W (L.V.side)S.C. test : 20 V, 25A, 85 W (H.V. side)Deternine:i- The eficiengy at 75 % offiull-load at 0.9 leading power factor.ii -The secondary terminal voltage on fill-load at tunity power factonAn acb sequence balanced three-phase Y-connected source supplies power to a balanced, three-phase Δ-connected load with an impedance of 15 + 6i Ω/ϕ. The source voltage in the b-phase is 240∠−45∘ V. The line impedance is 1 + 1i Ω/ϕ. Use the single phase equivalent circuit for the a-phase to find the current in ampere in the a-phase of the load. Express your answer using polar notation, only provide the polar angle in degrees.
- The equivalent impedance per phase of a star-connected load are as follows: Za= 100 Ohms, Zb=j5 Ohms, Zc= -j5 Ohms. If the load is connected to a 440 V supply, phase sequence an-bn-cn. Total power of the load." (THIS PROBLEM IS MULTIPLE CHOICE PLEASEE CHOOSE A LETTER BELOW AND PROVIDE YOUR CLEAR SOLUTION!) A 880 VA lag B 645.3333 VA C 717 VA D 880 VA leadA balanced 3-phase delta load is going to be connected across a 230 V, balanced 3-phase source. In connecting this load to the source, three-line conductors with impedances of 1 + j1 ohms each are used. If the impedance per phase of the delta load is 30 + j40 ohms each, its phase voltage across the load, Vbc is?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?