Power infrared diagnostic technology foundation

First, the basic principles and technical characteristics of infrared diagnosis

Infrared diagnosis is a technique that uses thermal radiation to detect and analyze heat-related issues in electrical equipment. Thermal radiation occurs when an object emits energy in the form of electromagnetic waves, and this energy varies depending on the object’s temperature and the wavelength of the emitted radiation. Infrared radiation, which falls within the 0.7 to 14 μm spectral range, plays a key role in this process. This technology enables non-contact temperature measurement, making it ideal for monitoring live equipment without interrupting operations.

Compared to traditional methods like preventive testing and offline diagnostics, infrared diagnosis offers several advantages:

Second, types of infrared temperature detection instruments and their requirements

Infrared thermometers are commonly used in power systems and come in portable, inline, and scanning versions. These devices operate based on the fixed relationship between an object’s temperature and its infrared radiation. They consist of optical systems, photodetectors, signal processors, and displays. Their portability, accuracy, and durability make them popular choices in the field.

Other tools include infrared line scanners, thermal TVs, and infrared cameras. Each has specific requirements for accuracy, ease of use, and environmental compatibility. For example, infrared cameras offer high-resolution thermal imaging and precise temperature readings, making them ideal for identifying hotspots in complex equipment.

Third, requirements for equipment and environment during infrared monitoring

For accurate results, the equipment being tested must be live, and any covers blocking infrared radiation should be removed safely. The environment must also meet certain conditions: ambient temperatures above 5°C, humidity below 85%, and no interference from rain, snow, or strong winds. Outdoor tests are best conducted before sunrise or after sunset to avoid direct sunlight, while indoor tests should be done with closed lights to reduce external influence.

Fourth, infrared temperature measurement diagnostic methods and judgment criteria

Diagnosis involves analyzing surface temperatures, comparing relative temperature differences, using similar equipment as references, and examining thermal spectra. These methods help determine whether a fault is minor, significant, or critical. Temperature correction formulas can also be applied to adjust measurements based on load and ambient conditions.

Fifth, application of infrared diagnosis in power equipment failure detection

Most electrical equipment faults involve heat generation. External faults, such as poor contact or oxidation, account for the majority of issues and can be directly identified using infrared tools. Internal faults, like insulation degradation or faulty connections, require more advanced analysis but can still be detected through surface thermal patterns. This method is widely used across various components, including generators, transformers, circuit breakers, and capacitors.

Conclusion

Infrared diagnosis is a powerful, non-invasive tool that enhances the safety and efficiency of power system maintenance. By detecting heat anomalies early, it helps prevent failures, reduce downtime, and extend equipment lifespan. With continuous advancements in technology, infrared thermography will remain a vital part of modern electrical diagnostics.

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