Near Time As Built Surveys

摘要

Near Time As Built surveys are a simple shift in the timing and approach that can reduce the risk associated with the schedule and budget, while providing an independent Quality Assurance during the construction of an electric transmission line. Rather than performing the As Built Survey at the end of the construction phase, the surveys are performed incrementally, within days of completing segments, with each construction phase confirmed and documented. The advantages of Near Time As Built surveys provide significant business and technical benefits. First, the incremental delivery shortens the overall schedule because the activity is running concurrently with construction. Secondly, the datasets can be delivered within days of finished construction on segments, which allows for corrective action to occur quickly if site conditions or construction factors impose modification to the original design. Critical clearance measurements can be delivered within minutes of clamping in a conductor. The survey serves as Quality Assurance (QA), saving time and money for the owner and construction company. Moving the activity forward in the project timeline reduces the risk of compromising the planned energize date. The As Built survey will also meet the on-going maintenance to preclude the reoccurrence of similar issues that caused the 2010 NERC Facility Rating Alert initiative. While the obligation for entities to report to NERC has concluded, many entities continue remediation, and some have put maintenance practices in place to help preclude the recurrence of similar issues and minimize the reliability risk posed to the Bulk Power System. Finally, the acquired datasets enhance construction inspection and can be repurposed for maintenance operations for asset management / GIS databases once the transmission line is placed in service.