Project Description

Advanced Treatment Improvements Taylor Mill WTP – Taylor Mill, Kentucky

The overall $28M project includes a new preliminary treatment system, granular activated carbon system with pump station, relocation of UV system, new electrical service and substation, new standby generators, and high service pump controls. Magna’s scope of the project included electrical design related to the new electrical service, generators, and the high service pump controls.

The existing plant is primary metered at 69 KV, with an on-site substation which is undersized for the entire plant load. The project includes a new 7.5 MVA substation, including a dead-end primary structure, high voltage switching, oil filled transformer, and surge protection/grounding in accordance with IEEE standards. The transformer secondary serves the new main paralleling switchgear, which includes provision for utility metering. Secondary voltage is 2,400, corner grounded delta.

The 2000A paralleling switchgear includes utility main breaker, and two generator breakers (with space for a future third). A load side breaker serves a new 1,500 KVA dry type transformer which provides 480/277V to the new PT/GAC facilities. A second load side breaker provides a back-feed to the existing filter building.

The existing filter building will be upgraded with a new 2,400V motor control center, to house six new high service pump starters, as well as additional switches for existing loads. Existing full-voltage high service pump starters, which range in size from 400 horsepower to 1,200 horsepower, will be replaced with solid-state, reduced voltage type. New controls will interface with existing pump control valves, as well as an existing Magna drive currently installed on one of the pumps. High service pump controls are coordinated with the existing plant SCADA system. New power and control wiring is provided from the new MCC to existing high service pump motors and field devices.

Fused switches are provided to back-feed three existing transformers throughout the plant, with provisions for re-connecting existing feeders. The project was carefully designed to allow the plant to remain in service during construction.