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Customer success stories | Eaton

Power Systems Engineering Design/Study for a Utility customer’s substation ground grid upgrade

PROJECT DESCRIPTION
Two solar arrays were in near vicinity to an existing 44 kV municipal substation (both outside the substation fence). The plan was to extend the substation fence to encompass both arrays. Eaton Electrical Services & Systems was awarded to design/study the substation ground grid upgrade to account for the changes such as the new fence location and solar arrays.

Project details 

Ground Grid Study and Design 44kV Solar Substation 

Eaton contact

Kia Fallahi 

Project number 

CQSIOTJ159448.2

SCOPE OF STUDY:

The ground grid design/study for the 44 kV municipal substation involved the following: 
  • CDEGS (Current Distribution, Electromagnetic Fields, Grounding and Soil Structure Analysis) software package was used to analyze the substation grounding system.
  • Soil resistivity measurements were collected using Wenner method to compute a multi-layer soil model using CDEGS-RESAP.
  • The existing ground grid layout was not available, and therefore, a new ground grid was designed and modeled in CDEGS (MALZ) to calculate its resistance and analyze its effectiveness.
  • The ground potential rise (GPR) of the substation grounding system was calculated during a single-lineto-ground (SLG) fault. 
  • The safe (maximum permissible) touch and step voltage limits were determined in accordance with IEEE Std. 80-2013. 
  • The safety of the substation was analyzed, and touch and step voltages were calculated within and around the substation fence to ensure they remain below the IEEE Std. 80-2013 maximum permissible limits during a SLG fault.
  • A detailed technical report was provided summarizing the data, assumptions, computer models, computation results, conclusions, and recommendations.
  • The proposed ground grid layout drawing with the associated grounding/bonding details were issued.
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