1. Investigation of Very Low Frequency Dissipation Factor of the Contaminated Underground Cable Joints
- Author
-
Tanachot Ravangvong, Tassana Hengcharoensuk, Thanapon Nupinit, Kittidech Chusang, Dusit Suksawat, and Norasage Pattanadech
- Subjects
Materials science ,0211 other engineering and technologies ,02 engineering and technology ,Dielectric ,Contamination ,021001 nanoscience & nanotechnology ,Iron powder ,Dissipation factor ,021108 energy ,Voltage source ,Composite material ,Very low frequency ,0210 nano-technology ,Joint (geology) ,Voltage - Abstract
This paper presents the characteristics of the contaminated underground cable joints tested by a very low frequency voltage source. The underground cable system used in the experiment was comprised of a 12/20(24) kV underground cable with a cross-section area of 240 mm2, and the length of 6 m. Four different case studies were simulated on the cable joint, i.e., a healthy heat shrink cable joint (case 1), a cable joint with an incision on XLPE surface(case 2), a cable joint contaminated with 20-micron iron powder on XLPE surface(case 3), and a cable joint contaminated with 20-micron copper powder on XLPE surface(case 4). The dielectric dissipation factor, also known as tan δ at very low frequency (0.1Hz) of such underground cable systems, was examined at 0.5 U 0 , 1 U 0 , and 1.5 U 0 , respectively. The very low frequency(VLF) test voltage was applied to the cable specimen, according to IEEE 400.2(2013). The test voltage was recorded and analyzed. It was found that the cable joint contaminated with 20-micron iron powder on XLPE surface had a maximum tan δ. The tan δ value decreased respectively for the cable joint with an incision on XLPE surface and the cable joint contaminated with 20-micron copper powder on XLPE surface. The healthy heat shrink cable joint showed the lowest tan δ. It was clearly shown that the contaminated cable joint caused higher very low frequency tan δ compared with the healthy cable joint.
- Published
- 2020
- Full Text
- View/download PDF