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Measuring the leakage current of insulator surface is an implementable and effective method to evaluate the insulator contamination. This paper proposed a portable leakage current monitoring system for site outer insulation studies. Difference mode has been applied in this system for common mode signal reduction. The synchronous sampling rate can reach 20kS/s, which can record full information in...
The thesis presents the contamination flashover voltage forecast model with the maximum leakage current, ambient temperature, humidity and other multi parameters on the basis of the research conclusion on insulator string contamination characteristics, so as to realize the online monitoring and evaluation on the contamination condition of the power grid. It comprehensively takes the calculation results...
Pollution flashover has serious impact on power system and jeopardizes the safety of its operation. Many measures to avoid pollution flashover have been taken by the utilities through long term experience, while the mechanism of pollution flashover remains further research. Artificial pollution test is an effective method to estimate the electrical performance of the insulation system, but its equivalency...
Combining with optical fiber transmission technology and digital signal processing technique, a leakage current monitoring system suitable for iced insulators based on fiber optic transmission has been developed by making use of multiple channel and high precision data synchronous collecting cards and virtual instrument technology software programmed. The designs of the leakage current sensor and...
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