Title :
Application of very-high-frequency (VHP) method to ceramic insulators
Author_Institution :
Sch. of Eng. & Technol., Deakin Univ., Australia
Abstract :
A VHF method (30-300 MHz) is applied to identify faults and defects in ceramic insulators. Insulators which exhibit internal cracks and fractures are used as test samples. Different artificial conditions are introduced to the test samples according to the IEC 507 standard under wet and dry conditions. Using a cascading signal processing technique and analysis methods such as FFT and fractal analysis, VHF signals acquired by digital scope are processed and analyzed. This study indicates that the fractal dimension can be used as an effective tool to isolate the common faulty conditions found on the ceramic insulators. The results from this study strongly support the prospect of using a VHF method to monitor the physical condition of ceramic insulators.
Keywords :
IEC standards; VHF devices; ceramic insulators; crack detection; discrete Fourier transforms; fault diagnosis; fracture; insulator testing; 30 to 300 MHz; FFT; IEC 507 standard; VHF measurement; cascading signal processing technique; ceramic insulators; digital scope; fast Fourier transforms analysis methods; faults identification; faulty conditions isolation; fractal analysis; fractal dimension; internal cracks; internal fractures; test samples; very-high-frequency method; wet-dry conditions; Ceramics; Condition monitoring; Digital signal processing; Fault diagnosis; Fractals; IEC standards; Insulation; Insulator testing; Signal analysis; Signal processing;
Journal_Title :
Dielectrics and Electrical Insulation, IEEE Transactions on
DOI :
10.1109/TDEI.2004.1387829
