Manzana 35-KV

MANZANA 34.5-KV COLLECTION LINES
Kern County, California
Owner: Iberdrola Renewables, Inc.

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Manzana 35-KV

The Manzana single- and double-circuit 34.5-kV overhead lines total approximately 5.5 miles long and were built with polymer horizontal post insulators and single-wood pole structures. The design includes two-pole structures for medium and large line angles. All angles and deadends are guyed. The conductor is one 1272 kcmil AAC Narcissus per phase, carrying a peak load of 50 MW per circuit. OPGW (fiber optic shield wire) was used for the entire line.

Special pole placement and guy arrangements were required at the crossing of the San Andreas Fault.

All construction was in compliance with APLIC Avian Safety requirements.

TriAxis completed the overhead line design on an expedited basis. TriAxis also provided engineering support during bidding and construction.

The Seneca lumber mill in Eugene, OR, continues to expand and increase load. The plant has outgrown the single 12.5kV feeder providing it power. TriAxis worked with the local electric utility, Blachly-Lane Electric Cooperative, to investigate and develop concepts and designs for providing the mill with two sources of power, each fully capable of serving the entire load. Having two sources will simplify maintenance, allow for plant growth, and allow the utility to readily move load between the two sources. The conceptual design is complete, overhead line rebuilding is underway (December 2014).

Completion Date: 2012

Design work for which TriAxis was responsible: 100%

Sececa Reconductor Design

SENECA RECONDUCTOR DESIGN
Eugene, Oregon
Owner: Blachly-Lane Cooperative

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Sececa Reconductor Design

The Seneca lumber mill in Eugene, OR, continues to expand and increase load. The plant has outgrown the single 12.5kV feeder providing it power. TriAxis worked with the local electric utility, Blachly-Lane Electric Cooperative, to investigate and develop concepts and designs for providing the mill with two sources of power, each fully capable of serving the entire load. Having two sources will simplify maintenance, allow for plant growth, and allow the utility to readily move load between the two sources. The conceptual design is complete, overhead line rebuilding is underway (December 2014).

SOLARCITY OIT

SOLARCITY OIT
Klamath Falls, Oregon
Owner: Oregon Institute of Technology

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SOLARCITY OIT

TriAxis Engineering provided initial development planning, medium-voltage interconnection design, generation step-up transformer specification and review, on-site construction inspection, specification and programming of medium-voltage padmount recloser, coordination of protective systems and schemes with local utility.

Completion Date: 2013

coyote260

COYOTE SPRINGS SUBSTATION
Hermiston, Oregon
Owner: Umatilla Electric Cooperative

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coyote260

This project included the full rebuild of a 115-kV to 12.47-kV transmission switching substation. The 115-kV was configured as a main and auxiliary bus which initially included three incoming transmission lines. The distribution includes a 25MVA transformer with four (4) feeder breakers and a dedicate bypass breaker. All distribution buss was open-air main and auxiliary with underground getaways.

TriAxis services included the full design except for protection and controls, RUS contract documents assembly, construction bid review, routine construction inspections and management, and RUS contract close-out document preparation.

Completion Date: 2014

Design work for which TriAxis was responsible: All protection except controls

JOHNS STREET

JOHN STREET
Longview, Washington
Owner: Cowlitz County PUD

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JOHNS STREET

Complete rebuild and conversion from 69 to 115 kV

Completion Date: 2013

Design work for which TriAxis was responsible: 100%

LONGVIEW FIBRE 115-KV 3-WAY SWITCH

LONGVIEW FIBRE 115-KV 3-WAY SWITCH
Longview, Washington
Owner: Longview Fibre

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LONGVIEW FIBRE 115-KV 3-WAY SWITCH

This project is located at the Longview Fibre paper and packaging facility in Longview, Washington. The project consists of the removal and replacement of a 115-kV concrete termination structure with a new 115-kV, self-supporting steel, 3-way switch structure. The new steel structure also accommodates an existing 13.8-kV distribution circuit. The 115-kV conductors are 795 kcmil "Tern".

TriAxis directed the site survey to assure clearances from all plant activities and to position the structure away from the main road and railroad intersection.

TriAxis directed the geotechnical investigation and designed the steel pole anchor-bolt foundation to support all loads. PLS-CADD was used in the line design, including the development of the structure model and production of plan and profile drawings. TriAxis services included steel pole shop drawings review, foundation design, stringing charts, construction unit assembly drawings, staking sheets, and services during construction.

Completion Date: 2013

Design work for which TriAxis was responsible: 100%

SILVERADO POWER PLAINVIEW SOLARWORKS 66-KV GEN-TIE

SILVERADO POWER PLAINVIEW SOLARWORKS 66-KV GEN-TIE
Lancaster, California
Owner: sPower

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SILVERADO POWER PLAINVIEW SOLARWORKS 66-KV GEN-TIE

This 66-kV generation tie-line segment interconnects Plainview solarworks' 66-kV substation to the Southern California Edison Antelope Substation. TriAxis designed the 0.5-mile-long 66-kV single-circuit overhead transmission line with a 1590 kcmil Falcon ACSR. The line consists of single, tubular-steel poles and conductors are supported from braced-post insulators. The average span length is approximately 450 feet. All structures are direct-embedded and self-supporting structures. PLS-CADD was used in all aspects of line design including the development of structure models, the evaluation of strength and clearance requirements, and production of plan and profile drawings. TriAxis services included all specifications, bid documents preparation, and services during the construction.

Completion Date: 2014 (in progress)

Design work for which TriAxis was responsible: 100%

WALNUT CITY SUBSTATION GET-AWAY 115-KV

WALNUT CITY SUBSTATION GET-AWAY 115-KV STEEL POLE DESIGN
McMinnville, Oregon
Owner: McMinnville Water and Light

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WALNUT CITY SUBSTATION GET-AWAY 115-KV

This project included the design and specifications for replacement of the existing three wood poles shown in this photograph. These wood poles and risers were replaced with one new self-supporting tubular steel pole adjacent to the substation. The new steel pole supports 115-kV transmission and two underbuild 12.47-kV three-phase, 4-wire distribution lines, and a 3/8-inch EHS shield wire. The pole foundation was designed for direct embedment.

The new steel pole was designed to support 556 AAC Dahlia conductors for both transmission and distribution. The pole design also included provisions for underground feeder riser and multiple communication attachments.

PLS-CADD was used in the line design, including the development of structure models and production of plan and profile drawings. TriAxis services included steel pole shop drawings review, stringing charts, construction unit assembly drawings, and staking sheets.

Completion Date: 2014 (in progress)

Design work for which TriAxis was responsible: 100%

SILVERADO POWER PLAINVIEW SOLARWORKS 66-KV GEN-TIE

UMATILLA ELECTRIC PORT OF MORROW SUB. TO RIPPEE ROAD SUB. 115/12.47-KV
Boardman, Oregon
Owner: Umatilla Electric Cooperative

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SILVERADO POWER PLAINVIEW SOLARWORKS 66-KV GEN-TIE

This project was for the design of a new 115-kV transmission line, approximately 1.7 miles long, to connect the UEC Port of Morrow Substation to the UEC Rippee Road Substation. The line was designed as a single-circuit 115-kV (1272 kcmil ACSR 'Pheasant") with double-circuit (556 kcmil AAC "Dahalia") underbuild and a continuous OPGW shield wire. All tangent structures are Douglas Fir Wood structures. Some deadends are tubular steel, monopole with anchor-bolt foundations.

PLS-CADD was used in the line design including the development of structure models and produc-tion of plan and profile drawings. TriAxis services included Plan and Profile, Steel Structure Con-cept Drawings, stringing charts, construction unit assembly drawings, staking sheets, RUS con-tract document assembly, bidders review, on going project inspections and management, including RUS contract close-out document submittals.

Completion Date: 2014

ALUMINA SUBSTATION

ALUMINA SUBSTATION
Salem, Oregon
Owner: Salem Electric

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ALUMINA SUBSTATION

Main 12.47 kV Bus Tie switch replacement which included working with a switch manufacturer to design a custom replacement so modifications to existing bus were not required.

Completion Date: 2014

WICHITA PHASE II ASR 138-KV

WICHITA PHASE II ASR 138-KV
Wichita, Kansas
Owner: City of Wichita

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WICHITA PHASE II ASR 138-KV

TriAxis provided complete design of 138/12.47-kV, 12/16/20 MVA dual transformer distribution substation. The substation supplies power to an aquifer storage and recovery facility.

Substation design features included:

  • 138-kV equipment includes circuit switchers for over-current protection and power-operated switches to initially serve two power transformers, and provide for a future third transformer.
  • The 12.47-kV bus is designed for 1200-amps and uses 20-kA rated reclosers.
  • Each transformer and main 12.47-kV breaker serves an outdoor distribution rack with six breaker positions: five for feeder circuits and one for a capacitor bank.  The two 12.47-kV racks are separated with a normally-open tie breaker.
  • Transformer relaying uses a typical differential scheme with current and time-over-current  backup tripping.
  • All power-driven switching devices may be controlled locally or via the SCADA system.

The substation is designed to normally operate with both power transformers in parallel with the 12.47-kV tie breaker closed.  However, the transformers can operate un-paralled, or switching can be reconfigured to serve all loads with either transformer. Operating the transformers in parallel requires higher-rated secondary equipment to handle increased fault currents. However, the added flexibility benefits the City through increased reliability. With each transformer sized to serve all loads, outages are minimized when maintenance is performed.

LIME WIND

LIME WIND
Lime, Oregon
Owner: Randy Joseph, Baker City, OR

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LIME WIND

Lime Wind is a 3000kW wind project, interconnected with the Idaho Power 12.47kV distribution system, located on BLM land east of Lime, Oregon. The project consists of six 500kW refurbished wind generators, 690V-12.47kV step-up transformers, 12.47kV collection system, automatic switched capacitor bank for reactive power control, and interconnection to Idaho Power.

TriAxis Engineering provided conceptual design support for the Interconnection Application, review of the System Impact Study and Facilities Studies, review and technical support during negotiation of the Interconnection Agreement, materials specification (transformer, cable, capacitor bank, sectionalizing cabinets), design review, medium voltage collection system design, low voltage interconnection design, programming for the capacitor bank control, and other support from project inception through commissioning. Please visit www.lime-wind.com for further information.

SOLARCITY 14.175MW

SOLARCITY 14.175MW, 12MW AC PHOTOVOLTAIC POWER PLANT
Island of Kauai, Hawaii

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SOLARCITY 14.175MW

14.175MW DC, 12MW AC, photovoltaic power plant built by SolarCity near Koloa on the southern side of the Island of Kauai. The plant includes 24 500kW inverters feeding 8 1500kVA 12.47kV-420V transformers. The 12.47kV medium-voltage collection system and interconnection to Kauai Island Utility Cooperative was designed by TriAxis Engineering. Low-voltage DC design and low-voltage from the inverters to the step-up transformers was developed by SolarCity with design supervision by TriAxis Engineering. TriAxis Engineering acted as the Engineer of Record.

Copco 2 Hydroelectric Substation

COPCO 2 HYDROELECTRIC
SUBSTATION 115/69-kV

Copco, California
Owner: PacifiCorp

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Copco 2 Hydroelectric Substation

This project consisted of designing a new four position 115-kV ring bus in the same location as the existing radial bus substation.  The new generator step-up transformers. ring bus connected two new hydro generator step-up transformers and a new 115/69-kV transformer to replace failing 115/69-kV.

The substation design included provisions for future conversion to a breaker-and-a-half configuration, it was necessary also for the hydro generators to continue operating while the new substation was being constructed.  A new control house was designed and installed to contain all the new relaying, metering and SCADA equipment.  The existing ground grid was analyzed using CDEGS software to verify safe touch-and-step potentials inside and adjacent to the substation.

TriAxis was responsible for all of the outdoor design, wiring and on-site support during outages. Estimated design cost was $164,000.

Solar City Rabbit Research Lab

RABBIT RESEARCH LAB PHOTOVOLTAIC SYSTEM
Corvallis, Oregon
Owner: Oregon University System

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Solar City Rabbit Research Lab

TriAxis Engineering provided interconnection support, low-voltage and medium-voltage design, and was the electrical engineer of record for this 1.5MW electric photovoltaic project developed by SolarCity of California and built on the Oregon State University campus in Corvallis, Oregon. The work included underground 600VAC and 20.8-kV design, transformer specification, protection design, and interface with the local utility (PacifiCorp) through the System Impact Study and Facilities Study interconnection process.

The plant includes over 5700 250Wdc photovoltaic modules on fixed supports, DC-system combiners and recombiners, 500-kW Xantrex inverters, 208V-20.8Y/12.0-kV 500-kVA padmount transformers, 25-kV underground cabling, a 25-kV Siemens padmount recloser to provide interconnection isolation from the utility system, and a 25-kV class padmount primary meter per utility standards. The interconnection protection scheme includes fiber-optic based transfer trip to the utility substation.

Commissioning is expected in November 2013. Completion Date: 2013 Design work for which TriAxis was responsible: 100%

Pine Tree Wind Farm Phase V

PINE TREE WIND FARM PHASE V
Kern County, California
Los Angeles Department of Water and Power (LADWP)

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Pine Tree Wind Farm Phase V

The design criteria utilized for the design of phases I through IV was verified and modified for the addition of ten wind turbine generators to the existing Pine Tree Wind Farm. The project included updating/revising the current padmount transformer specifications to meet the LADWP and turbine manu-factureer design specifications. To incorporate new pad mounted transformers project drawings were updated to include the new primary cable connections, secondary cable connections, conduit entrances to the wind turbine power modules, and foundations.

Design of the collection system included providing and updating design base files and coordination of the electrical design with the civil/site grading plans. Collection system studies included analysis of the current grounding transformer design to determine that the exsisting grounding transformer placement and sizing were adequate for the 10 WTG addition. The existing soil thermal resistivity analysis was reviewed and updated also.

New SCADA fiber optic systems were designed to tie into the exiting fiber optic system. New fiber runs were placed in cable trenches installed for the addition. Estimated design cost was $97,500.