4. A single-core lead covered cable is to be designed for 66 kV to earth. Its conductor diameter is 2 cm andits three insulating materials have permittivities of 5, 4 and 3 respectively with the corresponding maxi-mum safe working stress of 38 kV/cm (r.m.s.), 26 kV/cm. (rm.s.) and 20 kV/cm (rm.s.) respectively.Find the minimum diameter of lead sheath.[8-3 cm]5. A single-core 66 kV cable has a conductor diameter of 2 cm and a sheath of inside diameter 5-3 cm. Thecable has an inner layer of 1 cm thick of rubber of dielectric constant 4-5 and the rest impregnated paperof dielectric constant 3-6. Find the maximum stress in the rubber and in the paper.[63 kV/em, 39-5 kV/em]6. A single-core cable working on 66 kV on 3-phase system has a conductor diameter of 2 cm and a sheathof inside diameter 5-3 cm. If two intersheaths are used, find the best positions, maximum stress and thevoltage on the intersheaths.[d,=2-77 cm; d,=3-84 cm; 38-7 kVlem; V,= 41-1 kV, V, 23-9 kV]

We know that,gmax A=q2πεoεAr; gmax B=q2πεoεBr1;gmax C=q2πεoεCr2gmax AεAr=gmax B εBr1=gmax C εCr2…

4. A single-core lead covered cable is to be designed for 66 kV to earth. Its conductor diameter is 2 cm and its three insulating materials have permittivities of 5, 4 and 3 respectively with the corresponding maxi- mum safe working stress of 38 kV/cm (r.m.s.), 26 kV/cm. (rm.s.) and 20 kV/cm (r.m.s.) respectively. [8-3 cm] Find the minimum diameter of lead sheath.

4. A single-core lead covered cable is to be designed for 66 kV to earth. Its conductor diameter is 2 cm and its three insulating materials have permittivities of 5, 4 and 3 respectively with the corresponding maxi- mum safe working stress of 38 kV/cm (r.m.s.), 26 kV/cm. (rm.s.) and 20 kV/cm (r.m.s.) respectively. [8-3 cm] Find the minimum diameter of lead sheath.

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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