Delta Star Field Service completed the project of regasketing and parts replacement on four 30 MVA, 69 kV-13.8 kV power transformers at a PEPCO Georgetown Substation.

Potomac Electric Power Company (PEPCO) is a part of Exelon Corporation, serving more than 850,000 customers within the District of Columbia and Maryland, with a service territory of 640 square miles, nine facilities and 156 substations.

Delta Star Field Service was contracted by PEPCO to provide manpower and equipment to complete pre-testing, drain, regasketing, vacuum oil filling, and post-testing of the four transformers at the Georgetown Substation. Field Service technicians were to replace HV & LV bushings, all pumps, gauges and valves along with the oil processing and testing.

The building housing the power transformers was located in a busy, prominent area of Georgetown. Due to restricted street access, Exelon-PEPCO was responsible for providing proper access and a staging area for Delta Star equipment.

Without the ability to use a crane or boom, because of limited access into the building, Delta Star engineers designed a makeshift lift using a large hook mounted on the ceiling 25 feet above the power transformers for Field Service technicians to remove bushings and pumps.

A walkway bridge was designed so that pedestrians could safely progress over the sidewalk, uninterrupted or delayed by hose lines running from the equipment through the building. Hoses from the processing rig and tanker parked along the street ran under the bridge and inside of the building. Work was performed without interruption while also providing safety for pedestrians on their daily commute.

The Field Service project took 12 weeks to complete (three weeks per transformer) with additional work being performed from issues that were discovered once the project had begun. Delta Star’s Field Service technicians provided superior and comprehensive service to ensure all transformers were able to operate at peak performance with a focus on preventive maintenance that would then minimize future unscheduled maintenance.

Source: Delta Star