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Electrical Improvements

ACEC Illinois Engineering Excellence Merit Award Winner

Client: Illinois American Water Company

Location: Peoria, Illinois

Donohue provided planning and designed improvements to increase the effective capacity and improved reliability at their Main Station Water Treatment Plant.

The $6.8M project included the installation of a previously removed vertical turbine high service pump, replacement of the electrical distribution system and flood protection for the equipment due to the plants location next to the Illinois River. The plant previously used 2.4 kV for site distribution and high service pump motor utilization.

The system was upgraded to distribute 13.2 kV throughout the plant in a looped configuration using aerial reclosers and bare conductors supported by poles and cross arms. The reclosers are configured in a Main-Tie-Main scheme so that each half of the loop is fed from an independent utility source. A 13.2 kV engine generator will provide backup power to the loop in the event of dual utility sources being lost. The generator was provided with a custom enclosure that has a dedicated compartment for draw-out, metal clad switchgear that serves as the automatic transfer switch.

Other electrical improvements consist of a new power supply to the Ultraviolet Disinfection Facility, a new split bus, draw-out switchgear for the High Service Pump Station and a new split bus switchboard for the Filter Building. The split bus gear is fed from separate padmount transformers connected to opposite sides of the loop so facilities are connected to both utility sources.

Donohue designed a new supply for a 15 mgd high service pump as well as new induction motors and variable frequency drives for 5, 10 and 15 mgd pumps rated at 400, 700 and 1200 HP.

New SCADA equipment, including a PLC panel with redundant controllers and power supplies, was provided. The panel controls the High Service Pump Station and has overhead fiber communications to connect the High Service Pump Station to plant SCADA.

To maintain water treatment during the construction period, extensive construction sequences and constraints developed for the construction contract documents include coordination with the electric utility to minimize source disruptions. Construction sequencing diagrams and a possible construction schedule showing the inter-relationship of major construction activities was also included.

The successful project received an ACEC Illinois Engineering Excellence Merit Award.