According to the Overhead Line Design Standard for Transmission & Distribution Systems TS-107 of South Australia Power Networks, a minimum clearance of 255mm between 11kV phase-phase conductors shall be maintained under all conditions. This rated voltage is allowed to vary up to 10%. A range of conductors with diameter of 8.3mm, 14.3mm or 29.3mm are available for use. Calculate the worst-case electric stress and comment on the result. Note that the breakdown strength of air is 3kV/mm Hint: Consider two bare conductors (representing two phases) of radius a, separated by distance d, with a voltage V between them. Figure 1 shows the resultant electric field intensity in the air space. Ar r r=0 E(r) = - Figure 1 The electric field in the air between the lines (a ≤r≤d/2) is given by: V V/m 2r In 2a r = d d-a a

According to the Overhead Line Design Standard for Transmission & Distribution Systems TS-107 of South Australia Power Networks, a minimum clearance of 255mm between 11kV phase-phase conductors shall be maintained under all conditions. This rated voltage is allowed to vary up to 10%. A range of conductors with diameter of 8.3mm, 14.3mm or 29.3mm are available for use. Calculate the worst-case electric stress and comment on the result. Note that the breakdown strength of air is 3kV/mm Hint: Consider two bare conductors (representing two phases) of radius a, separated by distance d, with a voltage V between them. Figure 1 shows the resultant electric field intensity in the air space. Ar r r=0 E(r) = - Figure 1 The electric field in the air between the lines (a ≤r≤d/2) is given by: V V/m 2r In 2a r = d d-a a

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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