Easley Combined Utilities Substation 7

Easley Substation 7
UTEC, PLLC performed a Long Range Planning Study for Easley Combined Utilities (ECU) that indicated a need for a future substation due to substantial load growth on the east side of ECU’s service territory.  The study also provided the optimum location for the substation.  Once ECU found and purchased property, UTEC provided design, engineering, and construction services for the new Substation 7.

Initially, the substation was designed to serve four regulated 12.5 kV distributions feeders through new reclosers and voltage regulators.  A single 100 kV line termination and one 15/20/25 MVA, 100kV delta to 12.47/7.2 kV grounded wye power transformer with 100 kV circuit switcher was installed.  The transformer secondary is connected to the feeder bay structure through a metering structure and main breaker structure.  Two spare feeder bays were constructed; one with a recloser and voltage regulators to be used as a spare feeder position.  The substation has a radial configuration with both main and transfer 12.5 kV buses.

Ultimately, a second power transformer can be added to the substation, located to the east of the initial power transformer.  The primary of the second transformer will be connected to the 100 kV bus through a new 100 kV circuit switcher and 100 kV switches will be installed between the transformers.  This second transformer can be fed from the existing 100 kV bus tap or a new 100 kV transmission tap. 

The transformer secondary will be connected to new metering and main breaker structures.  Rigid bus will connect the future main circuit breaker to the 12.5 kV main bus.  Main breakers for both transformers will be installed.  A tie breaker will be added to divide the main 12.5 kV bus into two radial sections.  The substation will have room for two additional feeder bay positions, to serve a total of eight feeders.
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UTEC prepared design drawings; completed fault current calculations, rigid bus design calculations, direct stroke lightning protection calculations, and battery sizing calculations; prepared and evaluated major equipment specifications for a 100 kV circuit switcher, 15/20/25 MVA power transformer, overhead structures and equipment, 15 kV circuit reclosers, 7.62 kV voltage regulators, and the control building; reviewed shop drawings for all major equipment; prepared and evaluated general construction specifications; provided relay settings, SCADA setup, construction services and supervision, commissioning services, and record drawings.