Infrared thermography techniques have become an effective way of diagnosing electrical equipment faults. As far as the location of these faults is concerned, they can be divided into internal and external faults. Generally speaking, external faults are simple and internal faults are complex. Therefore, external faults are easily discernible and internal faults are difficult to pinpoint. To find internal faults by means of infrared thermography, one must know the law of internal fault attributes in relation to their infrared thermography characteristics. This paper aims to discuss techniques of diagnosing electrical equipment with internal faults by way of infrared thermography, and to show some typical examples thermographs of electrical equipment with internal faults.
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