The 69kV transmission system at the Fremont Department of Utilities (FDU) in Fremont, Nebraska, was based on 1950's vintage pilot wire relays. In recent years, FDU had experienced numerous mis-operations due to relay and communications failures. P & E Engineering Co. assisted FDU with analyzing the failures and developing alternatives to replace the ailing system. Based on the recommendation of P & E Engineering Co., FDU opted to replace fourteen 69kV terminals using Schweitzer SEL-311C relays. Pilot protection utilizes Mirrored Bits communicated over spread spectrum radios.

P & E Engineering Co. developed construction contracts and installation drawings. P & E Engineering Co. also developed settings for all of the relays.

• Analysis of relaying mis-operations & problems.
• Developed alternatives and estimated costs.
• Developed design documents for installation of replacements.
• Developed settings for new devices.

• Nebraska City Utilities, Nebraska City, Nebraska,
  69kV Transmission System Protection Replacement.
• Webster City Municipal Utilities, Webster City, Iowa,
  69kV & 13kV Relay & Control Replacement Project.