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Porcelain long rod insulators are widely used in transmission lines while many of their features are lack of research. To determine the voltage and electric field distribution of porcelain long rod insulators helps to guide the existing operational strategy. In accordance with the insulator structure and the actual working conditions, the simulative calculation of porcelain long rod insulator string...
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...
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...
The icing flashover characteristics and discharge processes of 500 kV ac transmission line long insulator strings energized in the ice accretion were studied. The influence of pollution and grading rings (including simulated conductor) on heavy ice-covered insulators?? flashover voltage were considered in this paper. Based on the artificial icing test results, it was found that 1) under the severe...
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...
In the present paper, study on icing flashover characteristics were carried out in artificial climate chamber of State Grid Electric Power Research Institute (SGEPRI) with XWP2-160 porcelain double sheds suspension insulators. According to IEEE Task Force on insulator icing test methods the natural freezing rain condition was simulated and 3 to 7 units XWP2-160 insulators were icing energized at service...
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