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High-voltage insulators are essential in overhead transmission and distribution lines. Various environmental factors and probable mounting inclinations may influence the performance of the insulators. Therefore, it is necessary to investigate both influences continuously and simultaneously using an Internet-based data-logging system. The test samples were vertical, thirty-degree, sixty-degree, and horizontal mounting inclinations on 7.5 kV-subjected pin-type silicone rubber (SiR) insulators. The recorded data were 7,917, acquired every five minutes for a month and analyzed using statistical tools. At midday, the surrounding environmental temperature, illuminance, and ultraviolet (UV) radiation reached the top, whereas the humidity reached the bottom. The air pollution concentration reached the highest levels in the morning, and rain rarely occurred. The insulator leakage currents reached the top before dawn and the bottom at midday. Originally, the typical highest leakage current was the vertical mounting insulator, which reached 1.36 up to 2.36 times compared to that of the remaining insulators; the maximum and maximum typical values were 24.3 &#x03BC;A and 4.9 &#x03BC;A, respectively. Increasing illuminance, UV radiation, and temperature influenced the leakage currents to decrease, but the leakage currents rose as the humidity, air pollution concentration, and rainfall increased. Based on the extrapolations, the vertical mounting insulator is the most vulnerable installation for severe air pollution concentrations, reaching a predicted warning condition of 287.2 &#x03BC;g/m&#x00B3;. However, the horizontal mounting insulator is the least suitable for rainfall above 16.86 mm. The typical shortest forecasted warning condition is 10.3 years on the thirty-degree mounting insulator.

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Influences of Mounting Inclinations and Natural Environmental Factors on Pin-type Silicone Rubber Insulator Leakage Currents Using the Internet-based Monitoring