Case Study | Utility Engineering
SMART GRID INTELLIGENT DISTRIBUTION DESIGN
Tangibl completed a series of design deliverables for the implementation of an advanced 13kV loop scheme, supporting the broader goal of grid modernization for a large distribution utility in the mid-Atlantic region of the U.S. The primary objective of the client’s program was to enhance circuit performance by reducing outage duration and frequency. This was achieved by 1) integrating solid-dielectric vacuum reclosers with single-phase tripping capability into existing 13kV loop circuits, 2) replacing outdated oil and vacuum reclosers with new, modern reclosers, and 3) connecting the protection and control of the loop at the substation with advanced optical fiber, digital microprocessor relays, and make-before-break sectionalizing and reclosing schemes.
Tangibl’s original scope of work involved a field review to identify optimal recloser locations and to assess the “make-ready” requirements for installing ADSS fiber optic cable in the power space on aerial distribution pole lines within the client’s most urbanized operating divisions. Additionally, Tangibl provided extensive permitting support for highway and railroad crossings. As the project progressed, Tangibl’s scope was expanded to include engineering support for substation control houses (inside plant), focusing on the fiber optic termination point in the control house relay rack to the “Point of Entry” (POE) or demarcation point, as left by the operating division engineering staff. Optical fiber runs were primarily aerial but also included underground runs from certain substations to avoid aerial lines, especially at major highway crossings.
The original deliverables provided by Tangibl included recloser design drawings, fiber design drawings, a construction bill of materials for specific 13kV loop circuits, and permitting deliverables. At the client’s request, these deliverables were expanded to include detailed isometric representations of recloser installations, ADSS fiber optic cable slack loops, transitions to main line riser poles, additional “make-ready” pole-top construction details, and reference drawings. Tangibl also created composite work orders, termination details to connect fiber optic cable to ALS equipment, and joint-pole-ownership documentation. Furthermore, Tangibl provided field support for the construction of the advanced loop scheme and prepared final drawings to represent as-built conditions.
Through this project, Tangibl contributed to the overall grid modernization efforts, enhancing the efficiency, reliability, and resilience of the client’s distribution network.