Characteristics and Joint Criteria of Visible Light and Audible Sound Signals During the Development of Transformer Defects
Power transformer is an important equipment for energy conversion in power system.Any faults in it will seri-ously affect the reliability of power supply and operation stabil-ity of the power system.Therefore,the accurate identification of various types of faults inside the transformer is of great im-portance.The failure of the transformer will result in the gener-ation of distinct audible sound and visible light signals.Study-ing the signal characteristics under different discharge forms is beneficial for the precise identification of internal faults in transformers.In this paper,three discharge models were de-signed to simulate the non-uniform field discharge,surface dis-charge and uniform field discharge of the inner pole of the transformer.The audible sound and visible light signals were measured and obtained under various defects,and the differ-ences and patterns between the signals were compared and ana-lyzed.It is found that in terms of audible acoustic signals,the main frequency of extremely uneven field discharge was 1980 Hz,the main frequency of surface discharge was 200 Hz,and the main frequency of uniform field discharge was 611 Hz.In addition,the visible light wavelength of surface discharge was primarily concentrated in the range of 360～540 nm.Moreover,the visible light energy of discharge under ex-tremely uneven field and uniform field was predominantly fo-cused around 482.8 nm and 660.8 nm.It is impossible to real-ize fault identification by visible light signal alone.The main frequency characteristics of audible acoustic signals for the two types of defects differ,however,By combining these two types of signals,fault identification can be achieved.The research results of this paper provide data support and guidance for transformer online monitoring.
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