0.038 +/0.072 f/phase. Calculate the line-to-line source volt- age magnitude required so that the loads are supplied with 208-V rms line-to-line.
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- A balanced three-phase load is connected to a 4.16-kV, three-phase, fourwire, grounded-wye dedicated distribution feeder. The load can be mode led by an impedance of ZL=(4.7+j9)/phase, wye-connected. The impedance of the phase conductors is (0.3+j1). Determine the following by using the phase A to neutral voltage as a reference and assume positive phase sequence: (a) Line currents for phases A, B, and C. (b) Line-to-neutral voltages for all three phases at the load. (c) Apparent. active, and reactive power dissipated per phase, and for all three phases in the load. (d) Active power losses per phase and for all three phases in the phase conductors.For a Y-connected source and load, which quantity does NOT have an identical counterpart in the single-phase equivalent circuit?A balanced, star connected three-phase system is directly connected to an unbalanced load, with a solid neutral connection. The line-to-neutral voltage Van on the load side and per phase load impedances (i.e., Za, Zb and Zc) are as below: ?an = 240∠0 ? ?? = 10 + 3? Ω ?? = 16 + 3? Ω ?? = 10 + 3?Ω Draw the circuit diagram and calculate the sequence currents and neutral current
- A short 3-phase transmission line connected to a 33kV, 50 Hz generatingstation at the sending end is required to supply a load of 10 MW at 0·8lagging power factor at 30 kV at the receiving end. If the minimumtransmission efficiency is to be limited to 96%, estimate the per phasevalue of resistance and inductance of the line.A single-phase transmission line has a resistance of 0.22 ohm and inductive reactance of 0.36 ohm. Find the voltage at the sending end to give 500kva at 2000V at the receiving end at a load power factor of 0.707 lagging. Also find the efficiency of transmission at this load.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 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?
- The IAC current of a balanced three-phase delta connected load is known as 10 Amps (-10 degrees) and the VAB voltage as 20 Volts (10 degrees). Accordingly, calculate the following expressions by considering the positive phase sequence. A) IAB=? B)load impedance=? C)IBC=?Using a test equipment, Vmax was found to be 5V while Vmin is 1V. The distance between voltage maximas is 14 cm and the first maximum was found to be 7 cm from the load. What is the load impedance if the characteristic impedance of the line is 75 ohms?Question-2) The parameters of a three-phase transmission line are given as Z = (12.84 + j72, 76)Ω and y = j5, 83x10^-4 mho. At the end of the line, a power of 55 MVA with a power factor of 0.8 is drawn under 132 kV voltage. Accordingly, calculate the line head voltage, active and reactive power values per line, and voltage regulation of the line using the nominal π circuit.7-) Since 55 MVA power is drawn from the end of the line under the conditions mentioned above, calculate the line head voltage (phase-phase voltage) and enter it in the box below. (The value will be entered in kiloVolts. Only the amplitude value of the voltage will be entered. The phase value will NOT be entered!!! Two digits after the comma will be sufficient. )8-) Since 55 MVA power is drawn from the end of the line under the conditions mentioned above, calculate the active power value per line and enter it in the box below. (The value will be entered in MegaWatt. It will be sufficient to take two digits after…
- The single line diagram of a power system is shown below. Load represented as impedance, (13.2) kV voltage It draws 60 MVA power from the system when it is below and (0.9) back power factor. Generators and transformers The related electrical parameters are given below. According to this; a) Calculate all impedances in this given circuit in pu and draw the equivalent impedance diagram of the circuit. (Select the base values as 100 MVA and 13.8 kV.) b) Since the voltage values of the generators are given as E1=1.1∟0° pu and E2=1.25∟10° pu, Calculate the value of the voltage (V1).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) 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.