A6 mm PVC sheathed insulated copper 82 m length cable (k=115) is short-circuited when connected to a 231 V supply If theimpedance of the short-circuit path is 0.15 Q the maximum permissible disconnection time required to avoid dangerously raisingthe conductor temperature is aboutSelect one:O a. 3.27 sOb. 5.1sOC. 1.97 sOd. 7.35 se. Another answer

The impedance of the cable is evaluated as:

Answered: A6 mm PVC sheathed insulated copper 82…

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...

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b) A fault occurs at bus 3 of the network shown in Figure Q4. Pre-fault nodal voltages throughout the network are of 1 p.u. and the impedance of the electric arc is neglected. Sequence impedance parameters of the generator, transmission lines, transformer and load are given in Figure Q4. V₁ = 120° p.u. V₂ = 120° p.u. V₂ = 1/0° p.u. V₂= 120° p.u. jXj0.1 p.u. JX2) 0.1 p.u. jX0j0.15 p.u. jXn-j0.2 p.u. 1 JX(2)-j0.2 p.u. 2 jX)=j0.25 p.u. JX20-10.15 p.u. jXa(z)-j0.2 p.u. 4 jX2(0)=j0.2 p.u. jXT(1) j0.1 p.u. jXT(2)=j0.15 p.u. jXT(0)=j0.1 p.u. Figure Q4. Circuit for problem 4b). = jXj0.1 p.u. j0.1 p.u. - JX(2) JXL(0) 10.1 p.u. = (i) Assuming a balanced excitation, draw the positive, negative and zero sequence Thévenin equivalent circuits as seen from bus 3. (ii) Determine the positive sequence fault current for the case when a three- phase-to-ground fault occurs at bus 3 of the network. (iii) Determine the short-circuit fault current for the case when a one-phase- to-ground fault occurs at bus…
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A6 mm PVC sheathed insulated copper 82 m length cable (k-115) is short-circuited when connected to a 231 V supply U the impedance of the short-circuit path is 0.150 the maximum permissible disconnection time required to avoid dangerously raisinig the conductor temperature is about: