The city of Provo, Utah is presently upgraded their sub-transmission system from 46kV to 138kV. To assist this process, NEI was hired as the Consulting Engineer to design a new substation to serve the town of Provo, Utah.

At the request of Provo City Power, NEI designed this substation for construction in two stages. The first stage of construction consisted of a two-breaker scheme being fed by two 138kV feeders and feeding one 20/26.67/33.33 MVA, 138kV - 12.47kV transformer, associated buswork, circuit switcher, breakers, relays, switches, and switchgear.

After the final stage of build-out this substation will be a four breaker ring bus being fed by two utility 138kV feeders and one 138kV power plant feeder feeding two 20/26.67/33.33 MVA 138kV - 12.47kV transformers and associated distribution switchgear.

The substation was designed to minimize outage time when the second stage of construction is accomplished.

Due to an unexpectedly high water table it was necessary to build a temporary water confinement basin to receive the water pumped out of the foundation excavations during foundation construction. That basin, shown in the picture above, was removed after the substation was completed.

NEI produced the complete engineering design documents. We wrote the construction specifications and assisted Provo City Power with bid and submittal evaluations. NEI also did a protection coordination study and calculated the relay settings. The final protection design will include a permissive overreaching transfer trip scheme (POTT scheme).

NEI, with the aid of Provo Power, did the final testing and commissioning. Construction, testing, and commissioning was completed and the substation went into operation in July of 1999.

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