Accumetrics - Model AT-8000 -Rotor Earth Fault Resistance Monitor
The AT-8000 Earth Fault Resistance Monitor (EFREM) provides continuous wireless monitoring of insulation fault resistance and field voltage on brushless exciter generator/motor field windings, combining advanced ground fault measurement techniques with the latest innovations in digital telemetry. The system also provides users with condition monitoring data, allowing operators to monitor trends over time in order to make better informed operational and maintenance decisions.
Advanced Ground Fault Monitoring for Synchronous Generators
The detection of field ground faults on generators or synchronous motors with brushless exciters has always been difficult. Conventional field ground detectors may detect the occurrence of faults but provide no advance warning or indication of the fault’s severity. The severity at the detection threshold may vary by several orders of magnitude, depending on fault location.
By combining a new generation of 16-bit digital rotor telemetry technology for the measurement of generator ground faults, Accumetrics overcomes these limitations with EFREM. Measurement of actual resistance allows users to monitor trends over time and track the progression of ground faults from their onset. This provides an early warning of impending failure and allows for predictive maintenance of a machine. The severity of ground faults can be used in making operational and maintenance decisions.
- Continuous online monitoring of faults while rotating or at standstill
- Fault resistance trending
- Fault location indicator
- Continuously monitors field excitation voltage
- Alarm relay contact outputs
- Rotor protection through condition based maintenance
- Predictive maintenance for large generators and motors