More D The effects are similar to those that may occur in service under the influence of dirt combined with moisture condensed from the atmosphere. Use caution when making either direct or comparative service behavior inferences derived from the results of tracking tests. This method recognizes the importance of such variability and suggests the use of special test solutions to meet specific service needs. For example, an ionic contaminant containing, in addition, a carbonaceous component such as sugar is substituted to cause tracking on very resistant materials like polymethylmethacrylate. Such contamination is considered representative of some severe industrial environments.
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Tracking performance of insulating polymer material for outdoor use is tested by "Test methods for evaluating resistance to tracking and erosion under severe ambient conditions" based on IEC or JIS C Samples should be inclined at an angle of 45 degrees, and be attached with electrodes at the top and bottom, and then be applied with specified voltage between the electrodes, while electrolytic solution should run from the top electrodes to the bottom.
Tracking occurs from the bottom, and then the time is measured for tracking to climb up for 20mm from the bottom electrode. This is how to confirm tracking performance carbonization and erosion resistance erosion characteristics. Insulating polymer materials used under severe conditions Power transmission or distribution line and outdoor electric facilities are used with higher voltages compared with indoor equipment. Widely used insulating materials for these devices are porcelain insulators and porcelain bushings.
However, these porcelain insulating parts have some disadvantages. They have poor shock resistance and thus are easy to break, and what is more, too heavy for regular maintenance. On the other hand, polymer materials have been increasingly applied to outdoor insulating because of its characteristics such as light weight, high resistant to shock, easy maintenance, and great resistance for contamination.
List of Standards.
ASTM D2303 – Inclined-Plane Tracking and Erosion Tester