Czasopismo | PRZEGLĄD ELEKTROTECHNICZNY | Rocznik 2022 - zeszyt 2

Electrical Performance of Composite Insulator under IEC/TR 62730 Standard Testing for 22 kV Distribution System

10.15199/48.2022.02.08

nr katalogowy: 136068
10.15199/48.2022.02.08

Streszczenie

This research is aimed to test the high voltage (HV) polymeric insulators to study Electrical Performance and deterioration at the insulator’s surface under the wheel test conditions. The samples of this research are four new silicone rubber with fiber-reinforced plastic rod insulators, FXB 22/70 model 22 kV that randomized from the commercial market in Thailand. The experiments in this research are the IEC/TR 62730 standards HV polymeric insulators for indoor used tracking wheel test. The results found that the samples’ resistance before and after the wheel test of 30,000 cycles has the lower resistance of 10 mm distance on the samples of 37.0 and 7.76 G, respectively. The sample resistances were higher than 2 M resistances, less than 3 mm erosion depth, and no punctured on the shed, housing, or interface that the criteria of the IEC/TR 62730 standards are accepted. Further, the hydrophobicity of the samples before and after the treatment were reduced from HC 1 to HC 6 that classified use STRI’s guide. The average leakage currents of the first 10,000 and 30,000 cycle’s wheel test were 0.037 mA and 0.074 mA, respectively. While, after 6,000 cycles of the test, the thermography showed that the areas at the end of insulator near the ground terminal were higher temperature than other, else after 30,000 cycles test, the insulator’s temperatures were higher at the core rod. Furthermore, the 1000x SEM photography shown that the three punched samples of the insulator’s surfaces of the new were smooth. After 15,000 cycles, the skins have aging than more and deeper textures after 30,000 cycles testing. Besides, the Fourier transform infrared spectroscopy found that the ATH of the samples before and after the treatment was reduced from 3,445.4 cm-1 to 3,367.8 cm-1, while other composites were not significantly different. Also, the results of low frequency dry flashover voltages of new and tested samples were 133.8 and 140.0 kV, respectively. The low frequency wet flashover voltages of before and after the wheel tested was 115.5 and 107.3 kV, respectively. Finally, the impulse flashover voltage test shown that the positive “polarity lightning impulse voltages of the new and tested samples were 235.4 and 231.53 kV, and the negative” polarity lightning impulse voltages were 261.9 and 256.4 kV, respectively.

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Bibliografia

[1] Rahul C, Studies on Silicone Rubber Insulators used for High Voltage Transmission (Master's Thesis, Department of Electrical Engineering, Indian Institute of Scienc, 2017), 4-5.
[2] Kuffel E, Zaengl W.S, and Kuffel J, High Voltage Engineering: Fundamentals" 2nd Ed., Newnes, (2000), 522-528.
[3] “IEC/TR 62730” HV polymeric insulators for indoor and outdoor use tracking and erosion testing by wheel test and 5000 h test, (2012).
[4]. “IEC 62217” Polymeric insulators for indoor and outdoor use with a nominal voltage greater than 1000V - general definitions, test methods and acceptance criteria, 2012.
[5] Thong-Om S, Payakcho W, Grasaesom J, Oonsivilaiand A and Marungsri B, Comparison Ageing Deterioration of Silicone Rubber Outdoor Polymer Insulators in Artificial Accelerated Salt Fog Ageing Test, World Academy of Science, Engineering and Technology International Journal of Chemical, Molecular, Nuclear, Materials and Metallurgical Engineering, 5(2011).
[6] Zhang Z, Liang T, Jiang X, Li C, Yang S, and Zhang Y, Characterization of Silicone Rubber Degradation Under Salt- Fog Environment With AC Test, IEEE Trans., 7(2019), 66714 - 66724.
[7] Chengrong L, Xiaoming H and Linjie Z. Image, Analysis on the Surface Hydrophobicity of Polluted Silicone Rubber Insulators. International Conference on Condition Monitoring and Diagnosis, Beijing, China (2008), 1-4.

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