3AC Engineering provides protection and control services to the electric power industry.

Our expertise is protection systems for transmission, distribution, and generation. 3AC is owned and operated by licensed professional engineers with extensive industry experience.


  • Protection and control design engineering
  • Relay evaluation and upgrades
  • Short circuit and coordination studies
  • Relay settings and logic development
  • Emergency services, event analysis, and troubleshooting
  • NERC PRC compliance
  • Owner’s engineer services

About Us

Brent Carper - 3AC Engineering

Brent L. Carper, P.E.

Principal Engineer


Brent is a professional engineer with 22 years of experience in the electric power industry. During his 8 years at Washington State’s largest utility and 10 years at engineering firms R.W. Beck and RAI, Brent has engineered a wide variety of protection and control projects at substations, switchyards, and power plants. In addition to traditional design engineering, Brent’s experience includes work in utility operations and engineering management. Brent teaches protective relaying at Washington State University, and has been an invited lecturer at the annual Hands-On Relay School every year since 2010.

Brent’s expertise includes:

  • Relay selection
  • Panel layout design
  • Protective relay logic
  • Relay-based automation
  • NERC PRC compliance
  • Emergency response and troubleshooting
  • Event analysis and root-cause investigations
  • Project management

Outside of work, Brent enjoys travel and camping with his family, and cheering on WSU athletics (Go Cougs!). His current life goal is to get his children’s LEGO bricks confined to a single room of the house.

Martin Moon - 3AC Engineering

Martin H. Moon, P.E.

Principal Engineer


Martin is a professional engineer with 26 years of experience in the electric power industry. Martin has 13 years of engineering services experience with firms RAI and SEL. Martin specializes in protection and control and has worked on transmission, distribution, renewable generation, substation, and switchyard projects. In addition to protection and control, Martin’s experience also includes field application support, medium voltage switchgear manufacturing, and substation design.

Martin’s expertise includes:

  • Relay scheme design
  • Fault and coordination studies
  • Digital relay programming
  • Development of custom relay-based protective and automation logic
  • Emergency response and troubleshooting
  • Event analysis and root-cause investigations
  • Utility and independent power producer interconnects
  • NERC PRC compliance

Martin lives in Boerne, Texas, with his wife and two children. He enjoys traveling and water-related activities with his family.


Brent Carper

Martin Moon

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