Outdoor insulator surface conductance and surface arcing

The degradation process of silicone rubber was investigated by leakage current monitoring in the inclined-plane method. A data acquisition system (DAS) with 12-bit, 8-channel analogi digital (AD) converter was prepared. The maximum erosion depth was measured for use as the degradation indicator. The result suggests that the discharge duration and current waveform are well corresponding with the degradation process. And fast Fourier transform (FFT) analysis from the stored wavefonn shows that the harmonic ratio 13111 corresponds with the initial sur face transition from hydrophobic to hydrophilic, and with further progressive degradation. In addition, it may be possible to use cumulative charge and peak pulses as quantitative indica tors of failure. Furthermore, the contact angle was adopted for assessing surface degradation.These results indicate that the surfaces are divided into top and bottom areas depending on the degree of exposure to dry band arcing. It seems that the bottom area subjected to most of the dry band arcing contains very short chains of silicone rubber as well as alumina lrihydrate fillers, while the top area shows the loss of filler particles.

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Practical PC-DA system for measurements of leakage current pulses on polymer insulators under wet contaminated conditions

Orbeck

Kawa

Chavez

et al.

IEEE International Symposium on Electrical Insulation

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Outdoor insulator surface conductance and surface arcing

Abstract: This procedure, as proposed earlier, further stratifies the compounds. Of the compounds in Fig. 11, curves 1,2 and 3 were subjected to the test, compound EPI failed to pass the test and was rejected.

Cited by 5 publications

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Practical PCA-DA system for measurement of leakage current pulses on polymer insulators under wet contaminated conditions

Practical PCA-DA system for measurement of leakage current pulses on polymer insulators under wet contaminated conditions

Leakage current monitoring and outdoor degradation of silicone rubber

Practical PC-DA system for measurements of leakage current pulses on polymer insulators under wet contaminated conditions

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