Pioneering the future of power testing and monitoring
Partial discharge monitoring offers the fastest response to detect insulation imperfections or faults in windings insulation, which result with free electrons movement inside the affected area. With this technology voids, insulation degradation and weak spots can be identified, trended and constantly monitored.
Mechanical problems can be easily detected by measuring vibrations.
Absolute, relative displacement (vertical/horizontal) and axial displacement can be monitored for evaluated. Sensors are permanently mounted on bearings (min 2 sensors for shaft displacement calculations) and min 1 sensor for absolute vibrations measurement and axial measurement.
Rotor flux monitoring
Motor faults are among the most difficult one to detect online due to the fact there are no centrifugal forces (which tend to move components) also thermal expansion plays important role as components tend to expand when they heat up so again online fault may not be detectable offline. Rotor flux monitoring system for synchronous motors monitors each pole magnetic flux as the pole passes the permanently installed flux probe and compares signals obtained from each pole for early detection of rotor windings shorted turns and ground faults.
Dynamic monitoring of current spectrum
Current spectrum analysis is another proven technique for detecting and identifying vibration related issues. By analyzing the harmonics in the current spectrum rotor bar problems and mechanical vibrations can be pinpointed by comparing peak frequencies and relating frequency to geometrical size and speed. Current spectrum monitoring is done with permanently installed CT sensors from where the signals are processed to a cab The data acquisition is performed using an internal 16-bit ADC to obtain high-resolution spectrum up to 0.01 Hz. Such a resolution is necessary for the work of the built-in spectrum analysis expert system.