Item 17 - Arc Flash Analysis and Safety Program Development

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6. Project References Project-1: Naval base Facility (NAVFAC) — San Diego, CA Year Completed: 2021 Client Name: NAVAL BASE Contact: Tom Rettenmaier Phone. (805) 390-6245 The scope of this project was modeling the entirety of the new substation for Pier-8 location for multiple ship skids fed from one of the main switchyards including the existing protection and feeders. The scope of the power system study was delineated at multiple redundant stations with transformers sized at 8MVA, 4MVA and 2.5MVA with several voltage regulators down to the 480V distribution circuits tied to renewable energy system (solar). Comprehensive power systems study was performed comprising power flow study, short circuit device evaluation, protective device coordination and arc flash hazard assessment/mitigation as well as programming SEL relays. This was a ten-month project that required gathering existing data, cross-referencing the existing single line diagram, and updating documents to ensure accurate record documents. Additional scope included highlighting existing installation code violations and recommendations to remedy and comply with current codes and standards. The overall power system study included a total of twenty-four scenarios of operation between utility and backup system, highlighting the worst -case incident energy at each piece of equipment. Deficiencies within the electrical system were highlighted and presented with recommendations to remedy such deficiencies, such as overdutied equipment, incident energies greater than 40cal/cm^2, and miscoordination between protection tiers. Project-2: Naval Air Weapons Station — Ridgecrest, CA Year Completed: 2021 Client Name: NAVAL AIR WEAPONS STATION Contact: Tom Rettenmaier Phone: (805) 390-6245 The scope of this project was modeling four new substations replacements and perform load flow study, short circuit device evaluation, protective device coordination and Arc flash hazard assessment/mitigation studies. Each substation is fed from the upstream switching station with 2500kVA, 2000kVA, 1500KVA and 1000kVA transformers including voltage regulators and Tri-Phase switches/protection from 12kV to 4.16kV / 480V loads. During the modeling and study, some deficiencies were found such as overdutied protective devices and adjustment of relay setpoints to coordinate with the upstream and downstream circuits. This studies for those four new substations may lead to the study for the entire electrical system of the facility due to some mis-coordination problems found in the study.