9) Given that Ven= 110 cos (oot +25) find Van and Vbn, assuming a positive (abc) sequence 10) Given that Vbn = 125 cos (cot +15) find Van and Ven, assuming a negative (acb) sequence
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- In a balanced three-phase Y-connected system with a positive-sequence source, the line-to-line voltages are 3 times the line-to-neutral voltages and lend by 30. (a) True (b) FalseA single-line diagram of a three-phase balanced system is given below. A bolted three- phase short circuit occurs at point P, when the operating voltage was 21 kV there. Calculate the rated interrupting current rating of circuit breaker A, D and E, both in per unit and Ampere value. D 8000KVA 9KV 20%. 12% 22/11KV 22,000 KVA Gen 11/22 KY 6000KVA Mz) 11 KV GKY 15% 22,000 KVA 22,000 KVA 22/7.33K 15% 22, 000 KVA [AN 14% All the givern impedances are su btoanslent valuer] givenA single-line diagram of a three-phase balanced system is given below. A bolted three- phase short circuit occurs at point P, when the operating voltage was 21 kV there. Calculate the rated interrupting current rating of circuit breaker A, D and E, both in per unit and Ampere value. Ic 10% D 12 (M) 9KV 22/11KV 22, 000 KVA 20%. A Gen 600OKVA 11 KV 11/22 KX Mz 6KY 22,000 KVA 22,000 KVA 22/7.33K 15% 15% 22, 000 KVA 14% LAll the given impedances are su btranslent values7
- The unbalanced four wire Y-connected load has balanced voltages of 415 V and the RYB-sequence. By taking VRN as reference, with the load impedances are ZR = 25 2, Zr = (20 + j15) Q, Z3 = (40 -j30) 2. (i) Sketch the three-phase circuit with three wattmeter connection to measure the real power in the system. (ii) Calculate the line currents and neutral currents. (iii) Calculate the wattmeter readings and find the total power absorbed by the load.a + b C Fig. 2 Em Zim Z www ZL M my LOAD: 120 kVA 0.6 pf lagging3 phase balanced Wye connected inductive loads have PLOAD When connected to VGEN three phase generator as shown in figure below. In this figure Van is reference voltage. (Generator internal resistance and line impedance are neglected. PLOAD and Van values are given in Table1.) a. Calculate the line currents (laA,IbB,and IcC) b. Calculate the line voltages (Vab,Vbc,and Vca) A N IbB b
- b) A three-phase overhead line has a load of 30MW, the line voltage is 33kV and power factor is 0.85 lagging. The receiving end has a synchronous compensator, 33kV is maintained at both ends of the line. Calculate the MVAr of the compensator given that the line resistance is 6.50 per phase and inductance reactance is 200 per phase.Line-to-ground voltages V = 28020°, ag V =2502-110°, and bg V=2902130° volts are applied to a balanced A-load consisting of cg 12+j16 ohms per branch. i. Calculate the sequence components of the line-to-ground voltages. ii. Draw the sequence networks. iii. Calculate the sequence components I, I, and I of the phase 0' 1' 2 currents.Question 5 Referring to Figure 5, the phase voltages VRN, VYN and VBN are 120Đ0V, 120Đ-120V and 120Đ120V respectively. The loads ZR, ZB and ZY are all 15Đ40W. Calculate: i. The line voltages, VBR, VRY, VYB. ii. The phase currents, /Y, IB, IR. i. The line currents, IRR, IYY, IBB. iv. The power factor, pf. v. The total power dissipated by loads. IRR IR IB V. BR VYB N ZR RY Iyy Zy Iy IBB Figure 5
- In regards to the Sequence Networks of Impedance Loads, If the the positive sequence V1 = 1.03 angle(-8), the negative sequence voltage V2 = 0.03 angle(-34), and the zero sequence voltage Vo = 0, what is the a - phase voltage Va? a. 1.05 angle(-8.7) b. 1.00 angle(-7.2) c. 1.01 angle (-9.0) c.4. A single-line diagram of a three-phase balanced system is given below. A bolted three- phase short circuit occurs at point P, when the operating voltage was 21 kV there. Calculate the rated interrupting current rating of circuit breaker A, D and E, both in per unit and Ampere value. Ic,!0% D 8000KVA M) 9 KV 20%. 12% 22/11KY 22,000 KVA Gen 11/22 KX 6000KVA Mz) 6KY 15% 11 KV 22,000 KVA 22,000 KVA 22/7.33K 15% 22,000 KVA 14% [ Al tue given impedances are su btranslent valueA balanced 3 phase load of 30 MW is supplied at 132 KV , 50 Hz and 0.85 pf lagging by means of transmission line. The series impedance of a single conductor is (20+j52) ohms and the total phase-neutral admittance is 315 x 10 -6 mho. Using nominal – T method , nominal π method. Determine (i) The A, B,C and D constants of the line (ii) Sending end voltage (iii) Regulation of the line