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Nidec asi service infrared termography

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SERVICE INFRARED TERMOGRAPHY

SERVICE INFRARED TERMOGRAPHY

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  • 1. Service Infrared Termography PPT2013.01.01.21EN www.nidec-asi.com
  • 2. Generalities Electrical diagnostics Mechanical diagnostics • Phase electric balance; • Vibration analysis (bearings, feet, foundation); • Electrical parameters analysis; • Precision balancing; • Insulation resistance and p.index; • Torsional vibrations analysis; • HV test in DC • Impulse voltage testing (interturn short); Motor Diagnostic Cycle • Pneumatic measurements; • Laser alignment check and corrections; • Airborne noise measurements; • Dielectric losses parameters measurements (tgd, capacitance) • PD measurements • Loop testing • Vibration analysis; • Airborne noise measurements Infrared Thermography Infrared Thermography is key in supporting both, electrical and mechanical diagnostics, while evaluating test results and estimating real risk of failure. PPT2013.01.01.21EN www.nidec-asi.com 2
  • 3. Why detecting temperature? Temperature strongly affects the life cycle of an Electrical Motor. 1 Statistically it has an influence on Failure Probability… 2 … and it reflects into Reduced Reliability. 3 Always represents a cost, to be avaluated depending on the specific application. PPT2013.01.01.21EN www.nidec-asi.com 3
  • 4. Why detecting temperature? Tools and Instruments Tools and Instruments An infrared camera produces an infrared image or thermogram. It depicts the thermal radiation in a scene as emitted and reflected by the objects in the scene based on their temperatures. The standard image is a greytone image that shows hot objects as white descending in greytones until black is reached, which is the coolest temperature in the scene. When appropriate we can colorize the image. Infrared cameras have become compact systems that look just like a normal video camera, are easy to use and generate a real-time highresolution image. Software being used for reporting has been designed with the understanding that most of the thermographic analysis work is done at the inspection site, where all relevant data is available. PPT2013.01.01.21EN www.nidec-asi.com 4
  • 5. Infrared Thermography What should be thermographically checked on motor? What should be thermographically checked on motor? The thermal behavior of electrical or mechanical Frame systems can be a powerful clue to diagnose problems and predict reliability of Bearings industrial equipment. Heat exchanger Terminal boxes External fan covers Coupling PPT2013.01.01.21EN www.nidec-asi.com 5
  • 6. Infrared Thermography Problems that can be detected Problems that can be detected Typical problems that can be detected through Infrared Thermography are: Electrical Systems: Loose or corroded connections. Faulty breakers or fuse blocks. Unbalanced loads on 3-Phase systems. Mechanical Systems: Excessive bearing temperatures. Deteriorated thermal insulation. Coupling Misalignments Clogged cooling ducts PPT2013.01.01.21EN www.nidec-asi.com 6
  • 7. Infrared Thermography Problems that can be detected Problems that can be detected This is what you see… PPT2013.01.01.21EN … This is what we see… www.nidec-asi.com 7
  • 8. Infrared Thermography Benefits Benefits  The infrared survey brings many advantages, and some examples are listed below:  Equipment and systems are inspected on-line, without production impact;  Testing is performed while plant is in operation, at load conditions;  Critical issues are shown to maintenance personnel immediately, without having to wait for a report;  Potential failures are easily located and unscheduled and unplanned downtime is prevented;  Infrared data correlates with other technologies including vibration analysis, ultrasound, and motor testing;  Large and hard to reach areas can be scanned quickly without the need for scaffolding or ladders; PPT2013.01.01.21EN www.nidec-asi.com 8
  • 9. On Site Experiences Some examples of Infrared Thermography checks carried on single motor parts are listed below: Electrical Systems: Loose or corroded connections. Unbalanced loads on 3-Phase systems. Faulty breaker PPT2013.01.01.21EN www.nidec-asi.com 9
  • 10. On Site Experiences Some examples of Infrared Thermography checks carried on single motor parts are listed below: Mechanical Systems: Excessive bearing temperatures. Coupling misalignment Clogged cooling ducts PPT2013.01.01.21EN www.nidec-asi.com 10
  • 11. On Site Experiences Some examples of Infrared Thermography checks carried on single motor parts are listed below: Overheating of windings and a specific hot spot on top winding. A fuse severely overheated PPT2013.01.01.21EN www.nidec-asi.com 11
  • 12. On Site Experiences Example of Infrared Thermography checks carried on stator during Ring Test procedure: Hot spots detected on stator core after coils removing PPT2013.01.01.21EN www.nidec-asi.com 12