GIS Research & Aspen Modeling
We exported existing information from Pepco’s GIS database to build an Aspen model of each distribution feeder affected by new recloser installations. Each Aspen model took into consideration conductors, transformers, reactors, protection devices including the proposed recloser(s) and any existing reclosers, fuses (150A and larger), feeder relays, and bus tie relay.
Fault Current Study & Recloser Sizing
Our team completed a fault current study to select recloser ratings and evaluate recloser installation locations. The output from this process was a spreadsheet showing fault current values at the proposed recloser and size of each new recloser.
Field Data Collection
Site visits confirmed feasibility of recloser locations. We established a web-hosted GIS map and associated database where all project information was collected and stored. Data collected while on site included pole class and height, visual condition assessment, pole attachments, attachment measurements, span measurements, and photos. Our team worked alongside MJ Electric, who performed construction readiness assessments.
Permit Preparation & Submission
We prepared and submitted applications for installation of reclosers to the local jurisdiction. Permit preparation included development of drawings and traffic control plans (TCPs), as required. TCPs depicted active work zones, lane closure information, sequencing of construction operations, required signage, and outline the work being performed. Pepco’s construction contractor was also responsible for procuring any occupancy permits for work within Washington, D.C. We proactively sought efficiencies through the combined submission of multiple sites at the same time to save on permit preparation and submission costs where allowable by jurisdiction.
Protection Settings Design
Our team provided protection settings files for the automated protective device on the same feeder as proposed reclosers and a memo in the Pepco standard format outlining the protection settings. Fault information was taken from the Aspen model and used to design a coordinated protection scheme for the feeder. We also provided firewall configuration files for each new recloser being installed.
GWD & WMIS Work Package
We provided a design for each recloser location, which in some cases extended to neighboring poles if they need to be altered or replaced to meet Pepco design specs. Work package preparation included making updates in GWD, completing line work requests and telecom work requests in WMIS. Our team was responsible for entry of BOM information into WMIS, which includes completing all WMIS tasks through Task 2000 (Design Finalization and Lockdown). We were able to gain access, onboard and be effective in Pepco’s GWD and WMIS while maintaining project schedule.
Diversity
We understand the importance of supplier diversity and partnered with KDM Engineering Inc. for this work. KDM Engineering is certified through both the Women’s Business Enterprise National Council as a Women Business Enterprise (WBE) and the National Minority Suppliers Development Council as a Minority Business Enterprise (MBE). KDM Engineering was responsible for completing a portion of the field data collection, design, work package/BOM development, and permitting. Our partnership with KDM Engineering is ongoing.