Impedance Analysis of Buffer Layer of High Voltage XLPE Cables

Hui, Baojun; Zhao, Peng; Zhu, Wenbo; Hou, Shifeng; Zhang, Yifan; Huang, Jian

doi:10.1109/cieec54735.2022.9846835

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“…To study the impedance detection technology of buffer layer defects, in this paper, the buffer layer is equivalent to a cascade model of buffer layer impedance unit [20]. As shown in Figure 2a, assuming that the pitch of the corrugated aluminium sheath is L , it is composed of section L 1 where the sheath is in close contact with the water‐blocking tape and section L 2 where there is an air gap between them.…”

Section: Theorymentioning

confidence: 99%

“…When the buffer layer is defective, white powders appear at the contact area between the water‐blocking tape and the aluminium sheath, which changes the volume resistivity ρ and relative dielectric constant ε r of the inner and outer water‐blocking tape in section L 1 . The volume resistivity and relative permittivity of the new water‐blocking tape are 1.3 × 10 2 Ω·m and 32.3, but the defective ones are 3.2 × 10 5 Ω·m and 12.5 [20]. Thus, as R 12 , R 23 , C 12 , and C 23 change in the impedance unit model, the input impedance of the buffer layer will change.…”

Section: Theorymentioning

confidence: 99%

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Broadband impedance spectrum detection of buffer layer defects in 110 kV crosslinked polyethylene cable with corrugated aluminium sheath

et al. 2023

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The buffer layer defects of high‐voltage crosslinked polyethylene (XLPE) cable occur frequently, which makes the detection method become the focus to be studied. Here, the broadband impedance detection technology for the buffer layer defects of high‐voltage XLPE cables with corrugated aluminium sheath is investigated. There are nine cable samples, including new and defective ones. Some of the defective cables are artificial, and the other is retired cables. The influence of wiring mode, the circumferential relative position of electrodes, cable length, artificial white powder, artificial damp, and retired defective cables on the impedance spectrum is studied. It is found that the wiring mode of the insulation shield/aluminium sheath at the end of the cable can effectively detect the buffer layer defects. And the broadband impedance amplitude spectrum of the buffer layer in defective cable, measuring at various circumferential relative positions, is obviously different. When there are white powders, air gaps, or ablation in the buffer layer, the broadband impedance spectrum (BIS) will increase by several times. When the buffer layer is damped, the BIS will reduce. The research here provides theoretical support and technical methods for the buffer layer defects of XLPE cable with corrugated aluminium sheath.

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Section: Theorymentioning

confidence: 99%

Section: Theorymentioning

confidence: 99%