Inspections of electrical installations

Thermography provides a fast overview of the conditions of electrical installations

  • Hot-spots are a good indicator for faults when doing comparative thermography
  • Reliable detection of hot-spots requires a sufficiently high number of pixels
  • During thermographic measurements load conditions have to be kept in mind
  • Important flexibility of infrared camera systems is reached by interchangeable lenses

Details about electrical installations

Qualitative thermography allows easy inspections

Inspections of electrical installations mostly focus on the detection of hot-spots – areas with excessive temperatures. Those can often be found by comparison of the same kind of components just having different temperatures. For example one phase can have a higher temperature in comparison with other phases due to a poor insulation which results in a creeping current. Already such a comparative analysis called qualitative thermography is absolutely sufficient in many inspection situations.

Faults can only be identified by having a sufficient number of pixels.

To provide a secure conclusion the infrared camera being used needs to come with an adequate resolution. Inspecting electrical installations especially the geometrical resolution should be focused on which is the number of pixels being available for the measurement. The more available pixels, the smaller are the hot-spots which can be detected from a certain distance and the earlier a developing fault can be discovered, resulting in a more secure inspection result. Like this no averaging of higher hot-spot temperatures and lower surrounding temperatures is made up which could prevent correct measurements with a infrared camera.

Temperature measurements are influenced by load situation of electrical installations

Very important for thermographic analyses of electrical installations is their load behaviour. When thermographic measurements are done in low load situations hot-spots will not be detectable securely as those areas will appear a lot colder than running at full load. Therefore either the measurements will be done at full load or the measured lower temperatures will be converted to those which would be measured when running at full load.

Interchangeable lenses allow the flexible usage of infrared camera systems

Very often thermography is used for controlling high voltage installations outdoors. To do those measurements correctly measuring smallest details full signal telephoto lenses should be used. In contrast limited space indoors could well result in the need to use wide-angle lenses for coverage of complete switchboards.

Infrared cameras for electrical installations

  • Infrared camera VarioCAM® HD inspect 900
    Infrared camera VarioCAM ® HD inspect 900

    3.1 megapixels guarantees precise infrared recordings in brilliant photographic quality.

  • Infrared camera VarioCAM® HD inspect 800
    Infrared camera VarioCAM ® HD inspect 800

    The ergonomic design of this professional system allows for fatigue-proof, mobile use and supplies precise and razor-sharp infrared recordings even under harsh environmental conditions.

  • Infrared camera VarioCAM® HD insepct 700
    Infrared camera VarioCAM ® HD insepct 700

    Designed for professional users, this thermographic system provides precise measuring results and its robust light metal housing guarantees for long-term operation even under harsh industrial environments.

  • Infrared camera VarioCAM® HD inspect 600
    Infrared camera VarioCAM ® HD research 600

    High geometric and best thermal resolution as well as excellent handling and extensive features allow its use for demanding inspection tasks.

  • VarioCAM® HDx inspect  600
    VarioCAM ® HDx inspect 600

    Control technical installations or inspect buildings thermographically with a thermal imaging camera that provides the entry to thermography at high-end level.

  • Infrared camera InfraTec mobileIR E4
    Infrared camera InfraTec mobileIR E4

    InfraTec mobileIR E4 is a low-priced, efficient and completely equipped infrared camera. This robust and very handy high-tech system convinces with its intuitively learnable handling and user-friendly single hand operation.

  • Infrared camera InfraTec mobileIR E9
    Infrared camera InfraTec mobileIR E9

    InfraTec mobileIR E9 is an efficient and budget-friendly infrared camera for mobile use. Exchangeable and quickly rechargeable batteries ensure a long period of application.

    Infrared camera InfraTec mobileIR E9

Case study

Photovoltaic Thermografie shows cell errors and cell breaks

Testing of photovoltaic installations with VarioCAM ® high resolution

Based on programs for energy conservation and for promotion of renewable energies, until 2009 in the European Union photovoltaic facilities for more than 15 GWp were installed, which approximately corresponds to the surface of Milan. Like for all electrical devices, solar cells and modules need to be maintained especially as they are located outdoors. Infrared thermography offers the possibility to localize and classify problems fast and also with a high accuracy.

Learn how the SOLARSCHIEMDE GmbH, Munich, benefits from the thermal imaging ...