Protective Relay Settings

The key to power systems safety and reliability is properly designed and coordinated Relay Protection settings. Power Grid Engineering’s protective relays services cover a broad range of solutions in creating setting files to protect Transmission, Distribution, and Generation systems up to 500kV. Our Relay Settings engineers are experienced in finding the optimum balance between security and reliability, while also adhering to customer Protection Relay logic requirements and NERC standards.


Download Protective Relay Settings Brochure

Protective Relays Services And Settings Capabilities

Transmission Line Protection

  • Multi-zone Step Distance
  • Pilot Relaying
  • Line Current Differential
  • Shunt Reactor Protection

Transmission Substation Protection

  • Breaker Control
  • Switchgear
  • Bus Differential
  • Transformer Differential
  • Capacitor Control & Protection

Generation Protection

  • GSU Protection
  • Motor Bus Protection

Distribution Line & Substation Protection

  • Differential Protection
  • Backup Overcurrent Protection
  • Fast Bus Differential Protection

Interconnection Studies

  • Short Circuit Studies
  • Breaker Duty Studies

Arc Flash Hazard Analysis

  • IEEE 1584

Nerc Studies

  • PRC-023-3
  • PRC-025-1
  • PRC-001-2

Portfolio Highlights

230/115 kV Transmission Substation Rebuild


Developed relay settings for a three terminal 230 kV Ring Bus, 10 terminal 115 kV Double Bus, 22.5 MVAR Capacitor Bank and 230/115 kV

Autotransformer Relay Settings Cross-Checking Review


Protective relay setting cross-checking review process including Relay coordination, I/O programming and logic settings. Ensure NERC PRC-023 Loading Criteria is met. Multiple transmission substation projects.


230/115/46 kV Substation QA Review


QA Review of proposed Relay Settings, logic diagrams and coordination studies for the addition of 230/115 kV Autotransformer, and complete rebuild and relocation of existing 115/46 kV transmission substation. This included replacement of all protective relay and controls and coordination of the surrounding transmission system.


Protection Coordination Design Study


Developed Relay Settings philosophy to protect feeders at 15, 25 and 35 kV voltage levels including minimizing I2t values. Coordinated feeder breakers with main breakers and power transformer backup overcurrent relays and protected gateway underground cables and overhead main feeder conductors.


Distribution Substation Relay Coordination Review


Reviewed the Distribution Protection and Control philosophy and Relay Settings.


Fault-Breaker-Protection Logic Study


Short circuit logic model fault study, breaker duty logic study and protection logic recommendations for interconnection of generation.


Origin Wind Farm


150MW 138/34 KV Wind Collector Substation. 

Protection Application logic, Short circuit model, Overcurrent Coordination Study, Relay Setting Files, SCADA Setting Files and PRC-023-2 report.


Solar Collector Protection & Control Settings

Ontario, Canada

30MW 115/27.6 kV Solar Collector Substation.

Protection Application logic, Short Circuit model, Overcurrent Coordination Study and Relay Setting Files.