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Max Yupanqui, P.E. , P.Eng.

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BIOMASS-HYDRO CENTRAL + TLINE + DISTRIBUTION. Chile.

on November 23, 2018

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Initial site visit to a future Central generation (Biomass + hydroelectric), substations and 220kV transmission line to interconnect to the existing electric grid. Chile-2014.

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Construction activities & Support2

CASE 1: Conductor with signs of stain or corrosion was installed (TX) Issue : The contractor noticed some type of surface defect on the 1272kcmil ACSR Bittern conductor. Initially the subcontractor didn't say anything to anybody and went ahead to install the conductor. TLine FW345-TX Solution : Southwire was contacted and confirmed a case of water staining. "When conductor reels are stored outdoors, water can accumulate on the conductor on the underside of the reel. If the water contains chemicals from the surrounded atmosphere, a black water stain can appear on the conductor. Water stains are a cosmetic issue; they have no adverse effect on the performance or service life of the conductor. In most environments, the conductor will darken in the first few months after the line is energized, and the stain will no longer be noticeable. Aluminum Association Technical Bulletin TR3, "Guidelines for Minimizing Water Staining of Aluminum" discusses this issue in detail an

Construction activities & Support1

CASE 1: Conductor damaged during installation: 2x1033.5 kcmil, 54/7, ACSS MA2 Curlew, 35,000Lbs RBS New 20miles, 345kV Tline, 2050 MVA, 140Ft ROW, IN Solution: 1.)Armor Rods=No 2.)Sleeve repair=Yes, but not immediately available during construction 3.)Splice=Yes, available. Installed. Result: CASE 2: Arm deflection: Issue: The 345kV arm installed on ground didn't show a 2deg. rise design deflection, it was 2" less than designed. After the review with the manufacturer it was clear 1.) The arm was not manufactured following the design or 2.) Installation was not done properly. It, most probably, was 1. Solution: After the analysis with the manufacturer it was shown that the missing deflection would Not affect the structure capability itself. The installed arm downward deflection was Not noticeable. CASE 3: Conductor damaged during installation: Issue: One of the lineman nicked the wire while hanging jerk ropes. 3 strands were broken and about 5 other were nicked up. Soluti

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It's always interesting and fulfilling getting involved in the Engineering preparation of 500kV TLines and higher voltage levels (765kV in the USA). Routing/Siting preparation, TLines design criteria, Electromagenic Field and Electric Field study, radio frequency and Corona effects, conductor optimization analysis and selection, structures optimization analysis and selection, conductor thermal calculation, regulators input, real estate, environmental, line survey, permitting (FAA, railroad), plscadd modeling, line layout, plan and profile dwgs., boring locations, permit documents, phasing drawings, thermal rating verification, stringing charts, structures design, loading tree, configuration dwgs, structures procurement, vendor's calculation and dwgs. review/approval. Bill of materials and materials selection, specifications, Geotech report, foundation design and drawings, engineering drawings, construction specifications, Issue for construction package release, engineering

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