A single phase transmission line is delivering 470 KVA load at 10 kV. Its resistance is 6 and inductive reactance is 90. If the load power factor is 0.7 lagging. Determine the Current through the line Sending end voltage Sending end power factor Regulation of transmission line
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- Consider three ideal single-phase transformers (with a voltage gain of ) put together as three-phase bank as shown in Figure 3.35. Assuming positive-sequence voltages for Va,Vb, and Vc find Va,Vb, and VC. in terms of Va,Vb, and Vc, respectively. (a) Would such relationships hold for the line voltages as well? (b) Looking into the current relationships, express IaIb and Ic in terms of IaIb and Ic respectively. (C) Let S and S be the per-phase complex power output and input. respectively. Find S in terms of S.Transmission line conductance is usually neglected in power system studies. True FalseConsider a single-phase electric system shown in Figure 3.33. Transformers are rated as follows: XY15MVA,13.8/138kV, leakage reactance 10 YZ15MVA,138/69kV, leakage reactance 8 With the base in circuit Y chosen as 15MVA,138kV determine the per-unit impedance of the 500 resistive load in circuit Z, referred to circuits Z, Y, and X. Neglecting magnetizing currents, transformer resistances, and line impedances, draw the impedance diagram in per unit.
- Consider the single-Line diagram of a power system shown in Figure 3.42 with equipment ratings given: Generator G1: 50MVA,13.2kV,x=0.15p.u. Generator G2: 20MVA,13.8kV,x=0.15p.u. Three-phase -Y transformer T1: 80MVA,13.2/165YkV,X=0.1p.u. Three-phase Y- transformer T2: 40MVA,165Y/13.8kV,X=0.1p.u. Load: 40MVA,0.8PFlagging,operatingat150kV Choose a base of 100 MVA for the system and 132-kV base in the transmission-line circuit. Let the load be modeled as a parallel combination of resistance and inductance. Neglect transformer phase shifts. Draw a per-phase equivalent circuit of the system showing all impedances in per unit.of stion 4 A single phase transmission line is delivering 450 kVA load at 12 kV. Its resistance is 4.5 2 and inductive reactance is 6 2. If the load power factor is 0.9 lagging. Determine the Current through the line Sending end voltage Sending end power factor Regulation of transmission line Efficiency of transmission line A load of 120 MW at a power factor of 0.8 lagging can be delivered by a 3-phase transmission line. The voltage at the intained at 33 kV and the loss in the transmission as 7.5 % of the power delivered. (ConsiderA three-phase symmetrical double circuit line is arranged in a horizontal plane as shown in figure below. Calculate and derive an expression for the transposed line for the inductance. Assume balanced equally distributed loads
- Consider the 500 kV, three phase bundled conductor line as shown in the figure below. Find the line to neutral capacitance. 0.5 m 30 mm (0) (O to Ine 15 m 15 mThe impedance per phase of 3-phase transmission line on a base of 100 MVA, 100 kV is 2 pu. Find the value of this impedance on a base of 400 MVA and 400 kV would be..The impedance per phase of a 3-phase transmission line on a base of 100 MVA and 100 kV is 2 p.u. The value of this impedance on a base of 400 MVA and 400 kV would be?
- In a three phase overhead system , each line is suspended by a string of three insulators. The voltages across top unit and the middle unit are 8KV and 11KV respectively. Calculate a) ratio of shunt capacitance to self capacitance b) line voltage c) string efficiency.please solve for nodal stress method. (if it is possible to apply supernodes)In single phase AC distribution system, the net drop is the difference of the drop in resistance due to the inphase component and in reactance due to quadrature component of current Select one: True False