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Reference: ISH2015_493

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This paper presents a study on surface tracking resistance of various types of cable insulations. Non carbon filled crosslink polyethylene (XLPE), carbon filled XLPE, low density polyethylene (LDPE), medium density polyethylene (MDPE), and high density polyethylene (HDPE) were investigated. The test specimen has a dimension of 10 mm in width, 50.8 mm in length and 1.52 mm thick. The test samples were divided into two groups for investigation. The former group was the new test samples, whereas the latter test samples were subjected to thermal ageing with 120oC for 168 hours. Then both specimens were experimented. One side of the specimen was contacted with high voltage electrode terminal made of 1 mm diameter Nichrome wire. Another side of the test specimen was dipped into 0.1 percent solution of ammonium chloride as grounded electrode. The distance between electrodes at dry condition was fixed for 25.4 mm. After finishing the test set up, AC high voltage was applied to the test specimen. The dip rate of the specimen into the solution was set up as 4 times per minute. The test voltage level was in the range of 1-3.5 kV. The experiment was performed in accordance with ICEA S-66-524 (Method B). The test voltage was applied to the test specimen until the insulation failure could be observed. Then, the insulation failure voltage and failure time were recorded. The test results showed that both unaged and aged HDPE and non carbon filled XLPE provided the higher surface tracking resistance than carbon filled XLPE, LDPE and MDPE respectively. Besides, the aforementioned thermal aging had not much effect on the surface tracking resistance characteristic of tested material. The analysis part for the test results showed that the material structure much more influenced the surface tracking characteristic of the cable material.

File Size: 346,2 KB

Year: 2015

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