2. For the electric power system shown in the figure below, draw the impedance diagram with all impedance marked in per unit.Choose 100 MVA 20-kV as base in the generator 1 circuit. The three-phase power and line-line ratings are given below:G1: 90 MVA, 20kV, X = 9%T1:80 MVA, 20/200 kV, X = 16%BOLineGT2:80 MVA, 200/20 kV, X = 20%G2: 90 MVA, 18 kV, X = 9%Line: 200 kV, X = 120 0Load: 48 • j64 MVA, 200 kVT2Load

Answered: 2. For the electric power system shown…

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

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Power engineering book Mehta
Problem 3.5: From a 3-phase, 480 V generator switchboard, a feeder takes 3-phase power to two equipment at the other end via cable and trans- former with the combined series impedance Z = 0.04 + j 0.09 N per phase. The voltage at receiving end point A rises and falls as a large 3-phase, 500 kVA load at point A varies over time. The small 1 kVA load, also connected at point A, remains online continuously, and must accommodate the voltage variations at point A with the 500 kVA load fully on or fully off. Determine the voltage range that the 1 kVA load will see, over which it must perform within its specifications.
Vbase_zonel Sbase_zonel . * For the power system shown in Figure Q1b, calculate the per unit impedances of all components with given zone 1 voltage base 22kV and power base 100 MVA (for the system). = 22 kV = 100 MVA Generator: . YG₁ Zone 1 100 MVA 22 kV (0.1+ j0.5) pu 1 . E 1 T₁ YY Transformer 1: 100 MVA 25/130 kV (0.1+j0.5) pu Zone 2 L = (10+j100) S2 Figure Q1b. T₂ Zone 3 YA Transformer 2: 50 MVA 110/33 kV (0.1+j0.5) pu M₂Y Load (motor): ● 50 MVA . 33 kV (1+j0.5) pu
In a three-phase system the per-unit phase voltages are 100° , Vôn = 0.8Z180° Van 0.920° , Von = 0.92 - а What are the per-unit symmetrical components V0) and V)? Express in polar notation.
If the line-to-line primary voltage and line current is 1.0 at 0 degrees, what is the secondary line- to-line voltage for the following three-phase transformers? Assume a turns ratio of N = 10. Express answer in polar form. a. Delta-to-Delta: b. Delta-to-Wye: c. Wye-to-Delta: d. Wye-to-Wye:
Referring to the circuit shown in Figure 1 below, solve the following problems: - i) Calculate the total impedance, ZT. ii) Determine the total current, Ir supplied by the generator iii) Determine the value of current at load impedance, I1, I2 and I3. iv) Calculate total real power, PT and reactive power, Qr supplied by the generator. v) Draw a power triangle of this circuit vi) Calculate the power factor of this circuit.
Sketch the Bode plot for the given function. G(s) = K/ S(S+3)(S+6) Determine the value of (i) Gain cross over frequency (ii) Phase cross over frequency (iii) Gain margin (iv) Phase margin (v) Value of k for stability
Question 3. A three-phase impedance load balanced D a connected load in parallel with a balanced ? connected load made of bonding. D each arm for the load ?D = 6 + 6? and ? each arm for the connected load It is given as ?? = 2 + 2?. ? the connected load ?? = 1? is earthed through the neutral impedance. To this impedance load, the symmetrical component voltages ?0 = 10∠60°, ?1 = 100∠0° and ?2 = Unbalanced phase-to-earth voltages ??, ?? and ?? of 15∠200° volts were applied. a) Draw the zero, positive and negative sequence circuits. b) Find the complex powers imparted to each component circuit.
How does a three-phase power system differ from a single-phase power system, and what are their respective applications?
A three-phase system has balanced conditions so that the per-phase circuit representation can be used as shown in Figure 1 Select the turns ratio of the step-up and step-down transformers that the system operates with an efficiency greater than 99 percent. Moreover, find the complex power (received or given) of all components in the circuit and the V1 and V2 voltages. The load voltage is specified as 4 kV rms, and the load impedance is 4/3 ohm. ..
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