Concept explainers
A single-phase,
Resistance of the 2400-V winding:
Resistance of the 240-V winding:
Leakage reactance of the 2400-V winding:
Leakage reactance of the 240-V winding:
Exciting admittance on the 240-V side
(a) Draw the equivalent circuit referred to the high-voltage side of the transformer.
(b) Draw the equivalent circuit referred to the low-voltage side of the transformer. Show the numerical values of impedances on the equivalent circuits.
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Chapter 3 Solutions
Power System Analysis and Design (MindTap Course List)
- Q2. a) A three-phase 415 V, 4-pole, 50 Hz, A-connected induction motor was tested. The obtained results are: (i) (ii) No load test 50 Hz: Blocked rotor test, 10 Hz: DC test: Vnl=415 V, Pnl=1200 W, In=11 A Vbr 10 V, Pbr=1500 W, Ibr=91 A VDC 3 V, IDC=107 A Draw the per-phase equivalent electrical circuit of the motor Draw the circuits for no-load and block-rotor tests and indicate the slip for each of the tests. (iii) Identify the motor parameters (iv) Calculate the motor's starting torque at the rated voltage.arrow_forward4. Consider the RC circuit with a sinusoid voltage source shown in the diagram below. The values of the resistor, capacitor, input voltage amplitude and frequency are R-20012, C-5pF", Vo-10V, and w=500 rad/s, respectively. Assume that the circuit has reached steady state. Vрейте 2 The input voltage can be described using the complex sinusoid function V(t)-Vo and the physical voltage is obtained by taking the real part of V(t). The voltage drop across the capacitor is given by a sinusoid with same the frequency was the input voltage, but a different magnitude and different phase. In complex form, the capacitor's voltage is given by Vc(t)=1+jwRC For the following questions, use the template file Assignment TemplateQ2.m as the starting point for your MATLAB code. (a) (6 marks) Use MATLAB to make a graph that shows the real part of the input voltage source ReV(t)] and the real part of the voltage drop across the capacitor Re[Ve(t)] as a function of time. Choose the time scale so that two…arrow_forwardConsider the microgrid given in figure 8-56. The positive sequence impedance of the transmission Lines is given in -line diagram (figure 8.5%). The system data are as follows: the one PV generating Station: 2MW, 460V. AC, positive, negative and zero Sequence impedance of each line is equal to 10%. The generator negativ Sequence impedance is equal to the positive Sequence, and the Zero Sequence impedance is equal to half (½) of positiv Sequence impedance. Transformers positive sequence impedance is equal to the negative sequence and equal to the zero sequence impedance Station DC/AC CB Acpu bus CB www S+js 5 1+jlo M 2 T2 SB CB A Jus -3+16 local utilityarrow_forward
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- A lossless resonant half-wavelength dipole antenna, with input impedance of 73 ohms, is connected to a transmission line whose characteristic impedance is 50 ohms. Assuming that the normalized pattern 000300 30° 90° 1 cos() of the antenna is given approximately by U(0) = 0.866 0 30° <0≤90° Find the maximum absolute gain of this antenna.arrow_forwardPlease show the solution and answers in each. Thank you.arrow_forwardPlease show how to solve this.arrow_forward
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