Advanced Ground Fault Monitoring with Predictive Trending

Real-time Insulation Resistance Monitoring for Safer, More Reliable Brushless Generators with EFREM AT-8000

The Earth Fault Monitoring System (EFREM) Model AT-8000 provides continuous, real-time monitoring of insulation resistance on the rotors of brushless synchronous generators. The insulation resistance is critical in protecting the rotor field windings by preventing dangerous electrical currents from flowing into unintended paths. Unlike competitive solutions that only trigger alerts when resistance drops below a critical threshold, EFREM trends insulation resistance over time, giving power plants an early warning of potential breakdowns before they become critical. This advanced feature helps prevent unexpected failures, reduces downtime, and enhances overall operational reliability. The system utilizes telemetry to wirelessly transmit insulation resistance and field excitation voltage data from the rotating shaft to the control room, ensuring accurate and uninterrupted monitoring. 

Designed for long-term reliability, the EFREM system installs directly on the generator rotor and operates for many years without requiring maintenance. It is backed by a comprehensive three-year warranty, ensuring confidence in its durability and performance. 

The EFREM AT-8000 Earth Fault Resistance Monitoring System provides continuous, real-time monitoring of insulation resistance on the rotor of brushless synchronous generators.

What You’ll Learn in This Video

  • How the EFREM AT-8000 system continuously trends insulation resistance to detect ground faults early
  • A detailed look at its three key components: the transmitter, pickup antenna loop, and receiver enclosure
  • Step-by-step installation overview on a brushless exciter
  • How 4-20 mA outputs and alarm relays work for enhanced plant safety and control
  • A live demonstration of alarm activation, trending data, and EFREM View software insights 

With real-time monitoring, predictive trending, long-lasting reliability, and seamless PLC integration, EFREM gives power plants the insight they need to address insulation deterioration proactively—minimizing costly repairs and ensuring continuous operation. 

Watch the full demonstration now to see why EFREM provides the most advanced protection for brushless generators!