TSS 112 Wilton Center 765kV Circuit Breaker

Will County, Illinois

Milhouse provided protection and control engineering design services for the addition of a new 765kV circuit breaker at ComEd’s TSS 112 Wilton Center on the L.11215 Inductor.

Milhouse,  as  a  subconsultant  to  Black  &  Veatch,  was  responsible  for  the  design  of  new  protective relaying for the 765kV L.11215 inductor, as well as design of controls for the new 765kV circuit breaker to replace the existing inductor link.  The design includes removal of the existing relay panel 121, along with upgrades to inductor protection on a new relay panel 121 entering the control house.

Milhouse’s scope included revisions to the existing 765kV Mimic (Control) panel to incorporate the controls and indication for the new 765kV circuit breaker.  Milhouse is also providing one-line diagrams, schematic diagrams, DC schematic diagrams, front views, bills of material (BOMs), wiring diagrams, cable tables, and demolition drawings.

Milhouse was also responsible for wiring and fiber design services for the 765kV circuit breaker. The work included creating new drawings that incorporate the vendor’s drawings for the new 765kV circuit breaker, as well as providing the required DC schematic diagrams, front views, BOMs, wiring diagrams, and cable tables. All new cables to the circuit breaker are being rerouted via the existing trench way.

In  addition,  Milhouse  designed  modifications  to  the  existing  SCADA  rack  to  incorporate  the connectivity of the new protective relays and circuit breaker control/status points. Additional scope  elements  include  a  battery  study  for  the  substation,  weekly  coordination  meetings,  construction support, and as-built record revisions.


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