Energy Delivery Engineering L7005 Vibration Mitigation NSPI Technical Memo Revision: 1 Date Issued: 4-Sep-24 REDACTED CI C0044172 Attachment 1 Page 2 of 247 Rev1. Sep. 2024 Page 2 of 27
AI summary The document is a technical memo from Nova Scotia Power Incorporated regarding vibration mitigation, issued by the Nova Scotia Energy Board. It includes a revision history and page numbers, but the content is redacted.
3.0 BACKGROUND The L7005 crossing was designed with vibration dampers, however, no galloping control devices like Air Flow Spoilers (AFS) were originally designed or installed on the crossing. Salvi dampers were installed for aeolian vibra...
AI summary The L7005 crossing experienced severe conductor damage due to uncontrolled vibration and galloping, leading to damper slippage and damage to the AACSR conductor. Dr. Havard's report outlines the drawbacks of the original Salvi dampening scheme and proposes mitigation options.
HAVARD ENGINEERING INC. 3142 Lindenlea Drive, Mississauga, Ontario, Canada, L5C 2C2 Telephone: (905) 273-3076 http://www.havardengineering.com E-mail: [email protected] To: Balraj Bilkhu, P.Eng., Sr. T-Lines Engineer Nova Scotia Power T:...
AI summary This document is an interim report by Havard Engineering Inc. assessing the 230 kV Canso Strait crossing for Nova Scotia Power. The report is part of a technical evaluation and was submitted in October 2021. The content has been partially redacted, with some sections marked as confidential.
2. WEATHER CONDITIONS & VIBRATION The location of the crossing is noted for multiple winter storms with high winds, heavy snow and icing. The design requirements for the crossing reflect these weather conditions. Wind loads are up to 125 k...
AI summary The Canso Strait 230 kV Crossing is experiencing damage due to aeolian vibration and galloping caused by harsh winter weather conditions, including high winds, heavy snow, and ice. The current design and damping methods are insufficient to control these vibrations, necessitating alternative solutions such as high strength interphase spacers and bolt tightening to prevent further structural deterioration.
REDACTED CI C0044172 Attachment 1 Page 23 of 247 REDACTED (CONFIDENTIAL INFORMATION REMOVED) Canso Strait 230 kV Crossing Assessment absorption curve for the individual damper included in the data provided. That is important to ensure that...
AI summary The document discusses the assessment of the Canso Strait 230 kV Crossing, including details about the conductor manufactured by ZTT Cable and tested at their Nantong Test Centre. The testing involved steel and aluminum alloy wires, with results confirming compliance with specifications.
EXECUTIVE SUMMARY An earlier report gave a detailed description of the Strait of Canso crossing, the technical problems and damage due to vibration and galloping and included suggestions for remedial action. [1] 1 In the intervening year,...
AI summary This report discusses the results of drone inspections of the Strait of Canso 345 kV crossing in May 2024. Minor residual damage was observed, but no significant new damage was found. Recommendations include repairing minor damage and installing vibration and galloping controls on all six conductor phases.
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