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Questions and Answers
What is the purpose of the per-unit impedance diagram in Figure 27?
What is the purpose of the per-unit impedance diagram in Figure 27?
- To calculate the real power consumed by a load
- To simplify the analysis of power systems by reducing the number of variables (correct)
- To visualize the single-line diagram of a power system
- To determine the nominal voltage of a power system
What is the significance of the '¾»' symbol in the one-line diagram of Figure 28?
What is the significance of the '¾»' symbol in the one-line diagram of Figure 28?
- It represents a step-down transformer
- It represents a load
- It represents a step-up transformer (correct)
- It represents a transmission line
In the per-unit system, what is the advantage of using a base value for voltage and current?
In the per-unit system, what is the advantage of using a base value for voltage and current?
- It simplifies the analysis of power systems by eliminating the need for complex calculations
- It allows for the calculation of real power
- It provides a normalized representation of the power system, enabling easier comparison of different components (correct)
- It is necessary for the calculation of reactive power
What is the purpose of G1 and G2 in the per-unit impedance diagram of Figure 27?
What is the purpose of G1 and G2 in the per-unit impedance diagram of Figure 27?
What is the significance of the 'µ´' symbol in the per-unit impedance diagram of Figure 27?
What is the significance of the 'µ´' symbol in the per-unit impedance diagram of Figure 27?
What is the purpose of the one-line diagram in Figure 28?
What is the purpose of the one-line diagram in Figure 28?
What is the value of S2 in pu?
What is the value of S2 in pu?
What is the value of V3 in pu?
What is the value of V3 in pu?
What is the value of I3 in pu?
What is the value of I3 in pu?
What is the line-to-line voltage at bus 2?
What is the line-to-line voltage at bus 2?
What is the value of I2 in pu?
What is the value of I2 in pu?
What is the line-to-line voltage at bus 1?
What is the line-to-line voltage at bus 1?
What is the per-unit value of S2 in the given problem?
What is the per-unit value of S2 in the given problem?
What is the value of V3 in per-unit?
What is the value of V3 in per-unit?
What is the line-to-line voltage at bus 2 in kV?
What is the line-to-line voltage at bus 2 in kV?
What is the value of I2 in per-unit?
What is the value of I2 in per-unit?
What is the transformer reactance in percent?
What is the transformer reactance in percent?
What is the value of S3 in per-unit?
What is the value of S3 in per-unit?
What is the line impedance in ohms?
What is the line impedance in ohms?
What is the line-to-line voltage at bus 1 in kV?
What is the line-to-line voltage at bus 1 in kV?
Study Notes
Problem 3.11
- The per unit impedance diagram for Problem 3.11 is shown in Figure 27.
- It consists of two lines: Line 1 with a voltage of 220 kV and Line 2 with a voltage of 110 kV.
Problem 3.14
- The one-line diagram for Problem 3.14 is shown in Figure 28.
- The three-phase power and line-line ratings are given as:
- S2 = 15.93 MW - j33.4 Mvar = 0.1593 - j0.334 pu
- S3 = 77.00 MW + j14.0 Mvar = 0.7700 + j0.140 pu
- The line-to-line voltages at buses 2 and 1 are calculated as:
- V2 = 440 kV
- V1 = 480 kV
Problem 3.17
- The one-line diagram for Problem 3.17 is shown in Figure 33.
- The transformer reactance is 20% on a base of 100-MVA, 23/115-kV.
- The line impedance is Z = j66.125Ω.
- The load at bus 2 is S2 = 184.8 MW + j6.6 Mvar and at bus 3 is S3 = 0 MW + j20 Mvar.
- The voltage at bus 3 is held at 1156 0â—¦ kV.
- The voltages at buses 2 and 1 are calculated as:
- V2 = 126.5 kV
- V1 = 27.6 kV
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Description
Solve problem sets related to power system analysis, including impedance diagrams and one-line diagrams. Calculate power and line-line ratings, and determine line-to-line voltages at buses.
