Answered: 17- The electromechanical breakdown…

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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Transcribed Image Text:17- The electromechanical breakdown depend on the type of the dielectric between two electrodes a- Right. b- Wrong 18- Basic Insulation Level (BIL) is related to the design consideration of the electric device, while Basic protection (BPL) level is related to protection level of the that device. a Right. Wrong. b- 19- As the voltage regulation increased, receiving end voltage will be reduced. Right. b- Wrong 20- We can be using Solar power generation field as a power factor and voltage profile enhancement in Distribution system. (aRight. b- Wrong. 21- From the general electrostatic theories, the field strength at breakdown is given by: a Eb = V/ do =0.6 [Y/ (€ o Er) ] 0.5. b- Eb V/ do = 0.6 [Y / (€ 0/Er )] 0.5. C- Eb V/ do = 0.6 [ Y/(Eo Er) 20.05. d- Eb V/ do = 0.6 [ Y/ (Eo Er) 10.5. 22- Consider plane electrodes with a solid insulator between them. Find the electric field strength at breakdown, if Young's modulus = 10000 (V.F/m2). and the relative permittivity is (36000 TT). If the distance between these electrodes is (1 Cm ), find the breakdown voltage at that field a- Eb = 600kv / m, V = 60kv. b- ) all these answers are wrong. ) Eb = 6000kv / m, V= 60kv. d- Eb = 60kv/m, V = 600V. 23- 1- The greater power transmission with d.c. over a.c. is given by the ratio of powers a Pd/Pa 2/cos 1.414 at p. = unity and 1.768 at pf 0.8. b- Pd/ Pa = 12/cos 1.141 at pf unity and 1.786 at pf = 0.9. C- Pd/Pa V3/cos 1.414 at pf unity and 1.768 at pf 0.9. d- Pd/Pa =V2/cos = 1.114 at pf = unity and 1.768 at pf = 0.8. 24- The expression for fair weather corona loss per phase is. a- 380 /8 (f+ 25) Vr/d (V- VO) 2 10-5 kw / km / ph b. b- 390/8(f+25 ) Vr/d (V+V0) 2 10-5 kw/ mile / ph. 390/8(f+ 25 ) Vr /d (V-VO)2 10-5 kw/mile/ph. d- 390/8(f+25) Vr/VO) -2 10-5 kw/mile/ph 25- Short HVTL with a sending end voltage of 1.05 p.u, and receiving end voltage of 1 p.u, and line impedance of 0.5 p.u, what are the Maximum and ? allowable power transfer on this line a- 2.05 p.u, 1.5 p.u. b2.1 p.u, 1.05 p.u. C- 2.15 p.u, 1.55 p.u. d- 2.05 p.u, 1.55 p.u.

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