Reducing Project CAPEX with Accurate Medium Voltage Cable Sizing
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  • August 21, 2020 Create Date
  • December 31, 2020 Last Updated

This technical poster (Reducing Project CAPEX with Accurate Medium Voltage Cable Sizing) was authored by an NEI electrical engineer and system studies expert. The research explores the aforementioned theory through technical analysis of a number of ampacity methods.

Medium voltage (MV) cable sizing is a critical component of the balance of plant (BOP) design for any wind or solar project. The size of these cables has a significant impact on material costs and system losses, which influence project CAPEX and long-term project costs. It is the opinion of the author that many MV cable systems are designed with excessive conservatism, which means that it is possible to reduce upfront cable material costs. It is recognized that reducing cable sizes may increase electrical losses over the life of a project.

The objectives of this publication include: Clarify how the industry may be excessively oversizing MV cables; Examine the CAPEX reductions achieved by using more precise, accurate, and realistic engineering design practices; Discuss the long-term project cost implications from higher losses caused by reduced cable sizes; Help stakeholders understand the implications of cable sizing.

This publication examines four methods of cable sizing for an example 300MW wind project. The cable quantities are compared for each cable method, and an annual loss calculation with each set of cable sizes was conducted in order to arrive at the authors conclusion.

Download this poster for more information on the topic of reducing project CAPEX with Accurate Medium Voltage Cable Sizing, and to see the results of the authors' analyses.

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