Northern Lehigh Reliability Project Quarry Sub Rebuild
- Location Pennsylvania
- TimelineApril 2016 - December 2017
The Quarry Sub is an existing 230/69kV sub with four 230/69kV transformers, four 230kV line and eleven 69kV lines terminated double bus double circuit breakers. PPL was upgrading the substation to meet current standards. This project consisted of three separate phases that were bid separately. Phase 1 included expanding the existing substation and installation of 2,750 feet of new pre-cast concrete panel security fence system to accommodate the new upgrades and addition 230kV Bay being added. The expansion consisted of very extensive civil work including grading, detention ponds, new access roads, and control cubical foundation including micropiles. There was also new ground grid in the expansion areas to be installed.
Phase 2 included installation of three 230kV/69kV transformer foundations including micropiles as each foundation. A total quantity of 18 new circuit breaker concrete pads and 72 drilled shaft foundations were installed. Approximately 2800 feet of pre-cast cable trench was installed throughout the site. Below grade conduits and below grade grounding grid was installed per the design. New control cables from the control cubical to new yard power equipment were pulled and terminated.
Phase 3 was outage driven. There were 28 outages that carried the crews until July 2017. Work during this phase included structural steel, circuit breaker replacements, installation of power equipment, and bringing the new control house into operation. Michels Power, Inc. was responsible for the demolition of the existing control house.