Solanoid AEMPTYSENSORSWITCHHeaterTemperatureSensorSolanoid BMOTORFULLSENSORSWITCHSTART/STOPEmergencyCONTROL STATIONSwitchSTARTSTOPFigure 01: Mixture systemox1L1L22 Y100ox2Y2°OX3Y300DoX4PLCY40DOX5Y500OX6Y6°ProgrammingCommonSourceportFigure 02: PLC unit

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Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter7: Symmetrical Faults

Section: Chapter Questions

Problem 7.21MCQ

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The bus bars of a power station are in two sections A and Bseparated by a reactor. Connected in section A are two 12MVA generators of 15% reactance each and to B, 8 MVAgenerator of reactance 10%. The reactor is rated 8 MVA and15% reactance. Two feeders are connected to bus bar Athrough transformers, each rated at 4 MVA and 5% reactance.Determine the maximum short circuit MVA with which circuitbreakers on the outgoing side of the transformers have todeal.
2. When a large shunt capacitor is suddenly connected in parallel with the load bus in the distribution feeder, what would happen to this bus current? O A. Increase B. Decrease D. None of Above
The direct electrical connection of the windings allows transient over voltages to pass through the auto transfonner more easily, and that is an important disadvantage of the autotransformer. (a) True (b) False
For 4 pole d.c machine armature winding with a double layer progressive simplex wave winding with 23 number of slots answer the following: a How many coils are present? b What is the coil span in terms of number of slots? c What is commutator pitch in terms of commutator segments? d How many coils are there between two consecutive commutator segments? e How many parallel paths are present?
Analyse several voltage and current situations in different loading scenarios in a simplified radial (transformer to consumption) medium-voltage power system example. There are only 2 nodes in the 35 kV line – node 0 from the 110/35 kV and node 1 with one consumer. The physical characteristics of the line and the loading scenarios are individualized for each student – please see the attached file Excel “WM9P3 Task1 data” for your particular data set. Briefly reflect on the complexity of the calculations for known input or output voltage, as well as for fixed or voltage-dependent consumption in this simple power system model. Analyse and discuss the sensitivity of the voltage drop [in % of amplitude and the degrees of phase] with respect to the current level [in %] and to the power factor.
A 10 ohms reactance is connected to a 120 V,60 Hz line. Calculatea. The reactive power absorbed by the reactorb. The apparent power absorbed by the reactorc. The peak power input to the reactord. The peak power output of the reactore. The duration of each positive power pulse
What is the purpose of sequence control
Solve and show complete solutions. Choose only from the choices
Three single-phase two-winding transformers, each rated 3kVA,220/110volts,60Hz, with a 0.10 per-unit leakage reactance, are connected as a three-phase extended autotransformer bank, as shown in Figure 3.36(c). The low-voltage winding has a 110 volt rating. (a) Draw the positive-sequence phasor diagram and show that the high-voltage winding has a 479.5 volt rating. (b) A three-phase load connected to the low-voltage terminals absorbs 6 kW at 110 volts and at 0.8 power factor lagging. Draw the per-unit impedance diagram and calculate the voltage and current at the high-voltage terminals. Assume positive-sequence operation.
subject
Q3/ For the system shown in figure. The generator is supplying 1.0 pu MW power under prefault condition. When three-phase fault occur at point F. What should the value of fault reactance must be to make the critical clearing angle equal to 58.9. Sc j0.1 j0.1 10.21 BE j0.38 38 j0.21 IEgl-12 pu 10.19 F 10.19 IVI-1.00 pu j0.1 j0.1 Q4/ Figure below shows the one-line diagram
stribution feeder has 600/5 C100 CT. A three phase fault of l=10200A occurs at F as shown in Calculate the voltage drop developed across CT if the phase relay burden resistance Z₁ = 0.1 , the lead resistance R₁ = 0.5f, and the CT resistance Rg=0.40 Will this fault current lead to CT saturation? If not at what fault level, the CT will saturate? GOM 600:5 O/C R Fig. 2 10200A

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Solanoid A EMPTY SENSOR SWITCH Heater Temperature Sensor Solanoid B MOTOR FULL SENSOR SWITCH START/STOP Emergency CONTROL STATION Switch START STOP Figure 01: Mixture system ox1 L1 L2 2 Y100 ox2 Y2° OX3 Y300 DoX4 PLC Y40 DOX5 Y500 OX6 Y6° Programming Common Source port Figure 02: PLC unit