The North Airfield Lighting Vault (NALV) at Hartsfield-Jackson Atlanta International Airport is responsible for supplying power to the two northern runways and associated taxiways. It receives power from two utility sources (primary and secondary) and has two standby generator sets as tertiary sources. The equipment operates at 4160/2400V, three-phase, four-wire configuration with solid grounding.
KEY Engineering Group was involved in specifying a new 750kW diesel standby generator set to replace the existing two 1250kW sets. The size of the new generator set was determined based on the load data from the current NALV switchgear. The generator set will be housed in a standard weatherproof enclosure with a skid- mounted fuel tank. Additionally, new current transformers (CTS) for relay monitoring and a generator set control module with communication protocol integration to the existing DOA network were specified.
To ensure protection and control, modern digital multifunction relays were specified to replace outdated relays. The NALV poses a challenge due to its 2400V phase-to-neutral loads, which required a solid grounding for the generator.
