Los Angeles Department of Water and Power (LADWP) Ground Return System Replacement Project

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The existing Sylmar Ground Return System is an integral component of the Pacific Direct Current Intertie Transmission Line, which is responsible for the transmission of essential power between Los Angeles and the Pacific Northwest.

Teshmont was retained by the Los Angeles Department of Water and Power (LADWP) to provide specialist electrode study and design services for the Sylmar Ground Return System Replacement Project. Our initial efforts focused on examining the existing reports and survey data provided by the LADWP relating to the design of the submarine electrode and electrode cables.

Teshmont developed a three-dimensional detailed model using the client’s in-house software to perform ground potential rise and interference studies. This was done to optimize the final electrode location by taking into consideration construction costs, and theoretical interference effects.

The studies along with the existing electrode were used as a basis to develop a conceptual electrode design. Improvements to the initial design were identified, and took into account the loss of an electrode cable, deterioration or loss of electrode vaults, and a provided a general safety margin.

Ultimately, Teshmont prepared a Request for Proposal for the LADWP to issue to potential electrode contractors. The RFP included scope of work, material lists, technical specifications, and construction schedule. A preliminary budgetary estimate for the electrodes was also prepared on the client’s behalf.

Teshmont’s work on this project is an integral contribution to the transmission of reliable, safe, and economical power for many years into the future over the Pacific Direct Current Intertie.

At a Glance:

Client: Los Angeles Department of Water and Power
Country: USA
Geographical Region: North America