EETS INC

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Transmission & Distribution

Our transmission and distribution (T&D) engineers specialize in transmission and distribution analysis, network planning, and the design of substations and transmission lines. The T&D team actively integrates an energy grid economy with T&D design, focusing on comprehensive utilization of demand-side participation, renewable energy, and distributed generation.

SPOTLIGHT

Transmission & Distribution Projects

Sacramento County, California

SMUD Rancho Seco to Pocket 230kV Transmission Line Project

The Rancho Seco switchyard has been in continuous use since the permanent shutdown of the Rancho Seco nuclear plant. It now serves as a major intertie, connecting the Sacramento Municipal Utility District’s electrical transmission and distribution system with the Western Grid transmission system. EETS engineers assisted with the design and addition of transmission lines:

  • 30 miles of 230kV double circuit bundled overhead transmission lines
  • Steel pole, vertical vee construction
  • 954kcmil all-aluminum conductor (AAC) ‘Magnolia’, 2 conductor bundled
  • 900MW

Sacramento County, California

SMUD 230kV Pocket Substation/Rancho Seco Switchyard Transmission Line

This project was a component of SMUD’s general plan to address the increasing residential and industrial electrical demands in south Sacramento. Additionally, these projects contributed to the creation of a redundant transmission link, ensuring an uninterrupted power supply in the event of a failure between Rancho Seco and Hedge Substation. EETS engineers worked on:

  • Design of (2) 230kV line positions at SMUD Substations Pocket and Rancho Seco
  • Design of (2) 230kV line positions at SMUD Substations Pocket and Rancho Seco
  • (2) new 230kV line positions at Pocket Substation including 230kV breakers, disconnects, buswork, protective relaying, metering, controls, footings and slabs, and structures
  • Activation of spare line position at Rancho Seco Switchyard and re-termination of 230kV Bellota transmission line
  • Design of 230kV double circuit bundled transmission line from Pocket Substation to Rancho Seco Switchyard

Tulsa, Oklahoma

Public Service of Oklahoma – Black Fox Switchyard

EETS staff participated in the design phase of this joint project between the Public Service Company of Oklahoma and the Associated Electric Cooperative of Springfield, Missouri. The design included:

  • 138kV ring bus configuration
  • Electrical design
  • Specification of equipment
  • 345kV breaker-and-a-half configuration
  • Electrical design
  • Specification of equipment

McClellan, California

McClellan Air Force Base

EETS engineers were asked to perform several tasks at the air force base:
  • Provide 60kV and 12kV distribution facilities site investigation reports
  • Provide as-built documentation and development in AutoCAD of full one-line and three-line
  • Provide AC & DC schematics and wiring diagrams for four (4) 69kV and 12kV substations

Sacramento, California

SMUD Transmission/Distribution Fiber Optic

EETS was asked to provide design services in coordination with Contra Costa Electric for the turnkey installation of 140 miles of fiber optic ADSS (All-Dielectric Self-Supporting) and OPGW (Optical Ground Wire) conductor in existing transmission and distribution facilities.

EBMUD

EBMUD Pardee Dam Powerline Safety Improvements

The District contracted EETS to design the upgrade of the existing 7.2kV distribution pole line connecting the Pardee Powerhouse, Camp Pardee, and the Pardee Chemical Plant. The primary goal of the project was to reduce wildfire risks and ensure reliable power service to the Pardee facilities. EETS’s evaluation also took into account environmental concerns, interactions with regulatory bodies such as FERC and DSOD,
The District contracted EETS to design the upgrade of the existing 7.2kV distribution pole line connecting the Pardee Powerhouse, Camp Pardee, and the Pardee Chemical Plant. The primary goal of the project was to reduce wildfire risks and ensure reliable power service to the Pardee facilities. EETS’s evaluation also took into account environmental concerns, interactions with regulatory bodies such as FERC and DSOD, impacts on Pardee Dam and the South Spillway from these upgrades, District maintenance efforts, associated costs, and adherence to an aggressive project timeline. The electrical design included the following components:
impacts on Pardee Dam and the South Spillway from these upgrades, District maintenance efforts, associated costs, and adherence to an aggressive project timeline. The electrical design included the following components:
  • Replacement of the existing medium-voltage breaker #12 electromechanical relay with a digital relay.
  • Investigation of the routing of the 7.2kV circuit from inside the existing powerhouse through challenging and sensitive dam terrain to all existing electrical loads, traveling both overhead and underground.
  • Sag tension analysis of new overhead line segments of the 7.2kV circuit.
  • Creation of a protection scheme with overcurrent and line relays for the new 7.2kV circuit.
  • Replacement of 7.2kV primary pole-mounted transformers with pad-mounted transformers, accompanied by padmount disconnect switches.

Power Projects