MOSAD®–IRIS Brush gear monitor
A diagnostic device designed for on-line measurement of synchronous generator brush gear current. Allows for timely detection of brush gear deterioration to prevent serious failures. Consisting of a contactless current transducer and processing and display unit, it can operate as a stand-alone device or can be connected to another diagnostic or information system via a LAN link.
Features
- Contactless current transducer IRIS 4.1, IRIS 1.1
- Hall effect sensor with compensation circuit and conditioning electronics
- Measurement range ±450 A
- Measurement accuracy better than 2 %
- Insulation withstand strength 3 kV
- Processing and display unit (PDU)
- Installation near to the machine
- Displaying of actual current values as well short-time and long time averages
- Measured values displayed in accordance with the brush gear brushes layout
- Colour distinguishing between current levels of different acceptability
- Local and remote alarms upon exceeding acceptability limits
- Adjustable parameters of average calculations and acceptability limits
- Statistical evaluation of measured values
- Providing data to a superior system, data archiving
- Continuos current measurement in individual brushes
- Transducers adaptable to any brush gear design
- Synchronisation with other systems or components through a time standard
- Unattended operation
- Robust design
- High resistance to conductive dust, vibrations and electromagnetic interference
- Automatic switch-off of transducer power supply upon opening of the generator output breaker
IRIS 4.1 transducer mounted on a four-brush bracket
Transducers installed in the generator brush gear
The PDU front panel
Time behaviour of brush gear current during 15 days
IRIS 1.1 transducer