With the advantages of remote

untouched fast and large area scanning

infrared thermography has become an effec-tive way to diagnose equipment with internal or external faults. For electrical equipment faults

it is easy to diagnoze the external faults

but difficult to diagnose the internal faults by using thermography technology. So to diagnose the internal faults

one must have good knowledge of the relation of the internal faults attribute with the thermography charater. This paper discusses the problems related to the infrared thermography in diagnozing the electrical equipment with internal faults.