Overhead power lines planning, design, construction - nolasco, et al

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Mahesh Sontyal

Overhead power lines planning, design, construction - nolasco, et al

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EXECUTIVE SUMMARY This technical brochure specifies and explains the primary elements of the sag-tension calculation process, a process which is essential to the design and construction of overhead lines. The various mathematical tools and conductor data considered herein are used to predict sag and tension of catenaries at the full range of conductor temperatures and ice and wind loads that occur over the rather long life of an overhead power line. The goal of the document is not to develop a unique or “best” calculation method, but to describe the overall process and explain the common calculation methods. Introduction Historically, for most overhead transmission lines, the sag of conductors (or tension) is measured at the time of construction when the line is not energized. At the time of installation, the conductors are at a temperature of 10oC to 35oC and tensioned to no more than 10% to 30% of their rated tensile strength. Once the line is constructed, the phase conductors may be subject to high temperatures during periods of high electrical loading and both the lightning shield wires and phase conductors must remain intact during high ice and wind load events for an expected useful life of 40 years or more. Under all foreseeable conditions, the conductors must not break under high tension, fatigue under persistent wind-induced motions, nor sag such that minimum electrical clearances are compromised.

SAG TENSION CALCULATION METHODS FOR OVERHEAD LINES

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Code of practice for Distribution Lines and Transformer centre, types of transformer centres - Pole mounted, plinth mounted, indoor and outdoor types. Determining the rating of Distribution Transformer. Write Specifications of the Distribution Transformer. Draw the SLD of a Transformer centre indicating the size of protective devices, Prepare the schedule of equipments /Materials with specifications for a 11KV/415V,100 KVA transformer centre and their estimates, 415 V LT line materials and specifications , method of calculating various LT line materials (only). Prepare the schedule of materials (only) for 3 phase 4 wire LT line, 11 KV HT Line-materials and their specifications, method of calculating various HT line materials and tapping structure, TOPO sheet and its use, Concept of combined estimates. Prepare the schedule of materials (only) for 11 KV single circuit HT line for Rural Electrification. (Note: HT lines over head type only)

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