A 3 phase 200 MVA capacitor bank is to be switched off (disconnected) the grid that operates at 13.8kV (3-phase) at 60 Hz. The capacitor is connected in a WYE configuration, therefore the voltage across each phase is VL-N = 7.97kV. a. A restrike occurs at the zero crossing of the current. Determine the magnitude of voltage across the capacitor after the restrike. b. 0.05 mSec after the first restrike the arc extinguishes, which leaves a 1st charge trapped. Another restrike occurs again 3/8 of a cycle after the first restrike and is quickly extinguished. Identify the magnitude of voltage trapped across the capacitor after the second restrike.

A 3 phase 200 MVA capacitor bank is to be switched off (disconnected) the grid that operates at 13.8kV (3-phase) at 60 Hz. The capacitor is connected in a WYE configuration, therefore the voltage across each phase is VL-N = 7.97kV. a. A restrike occurs at the zero crossing of the current. Determine the magnitude of voltage across the capacitor after the restrike. b. 0.05 mSec after the first restrike the arc extinguishes, which leaves a 1st charge trapped. Another restrike occurs again 3/8 of a cycle after the first restrike and is quickly extinguished. Identify the magnitude of voltage trapped across the capacitor after the second restrike.

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

See similar textbooks

Similar questions

a) The voltage across a 20uF capacitance is v. = 50 sin( at - 80) volts and Frequency equal to 100 Hz. Determine the current through the capacitor i and sketch its waveform. b) Define phasor
Find the equivalent capacitance for the following circuit. Round the final answer to the nearest tenth of a decimal point. Example 12.4uF or 2.7pF. 16uF 20uF 4uF 4uF 10UF 10UF
Question 8. What is the total inductance of a circuit containing three 5h inductors connected in series? A. 5h. B. C. D. 15 h. 1.67 h. 10 h.
A capacitor "C", an inductor "L" and a switch "S" are connected in series. When the switch is open, the plate to the left of the capacitor has charge "Qo". The switch is closed the load and current vary sinusoidally with time. Represent graphically the load "Qo" and the intensity of current "I" as a function of time "t", and explain why the current leads the load by a phase difference of 90°.
An inductive impedance made up of a resistor and an inductor has the characteristic that its currentadvances in phase to the voltage at the impedance A) lags in phase with the voltage across the impedance B) is in phase with the voltage across the impedance. C) None of the above
The current through a 15kohm resistor is given below, using Ohm’s Law to find the voltage, convert to polar form, complete the math, then convert back to the waveform at i1 = 3.5sin(2500t) mA and i2 = 2.3sin(200t – 60°) mA
Q9. i) An inductance network with total inductance across A and B is 30mH is shown in Figure CI. L4 L2 = 40mH L6 = 40mH Leq-30mH L1= 20mH L5 50MH 100mH 30mH B. Figure C1 Estimate, inductance value, L4. [3]
A utility company plans to connected a total of 20uF of capacitance to a 7,200 volt line. To make this connection, four capacitors will be connected in series. What is the capacitance of each capacitor?
An inductor and a 470 ohm resistor are connected in series with a function generator. The current is 53.7mA RMS 8kHz. The reactive power is 2.32 var. Find the value of the inductance.
For the series-parallel inductor circuit shown in figure B19, answer the following questions. 2mH 4mH SmH 3.5mH 8mH 8mH n2mH Figure B19 Determine the inductance, L value. If E is the energy stored in inductor for current, I. Calculate the energy if the current value is increased twice.
58. Two capacitors, a 20 µF and a 30 µF, are connected in series to a 60-Hz source. What is the total capacitive reactance? a. 117.96 N b. 221.04 N c. 253.05 N d. 333.16 N
60. Design a circuit to limit a 20 V rms sinusoidal voltage to a maximum positive amplitude of 10 V and a maximum negative amplitude of -5 V using a single 14 V de voltage source.