Distribution network cable detection based on terahertz pulse and imaging

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Moisture of high voltage distribution network cables will cause major safety hazard, but there is no effective means to detect and analyze the internal humidity state of the cables. Therefore, it is urgent to develop a new non-destructive detection method to evaluate the waterproof performance of distribution network cables and their connectors. The internal structure of the cable is a multi-layer structure composed of wires, cross-linked polyethylene insulation layer, and silicone rubber insulation sheath. We used the reflective terahertz pulse signal to detect the internal states of the cable, and judge whether it contains water stains according to the echo characteristics. In addition, three-dimensional data was obtained through cylindrical coordinate scanning and terahertz images were reconstructed based on feature information, which were consistent with the distribution of water stains between the cable insulation sheath and cross-linked polyethylene insulation layer. The results show that the terahertz technology can realize the high sensitivity detection of cable moisture state, which is of great significance in the power and transmission industry.

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作者简介

Guowei Li

State Grid Hebei Electric Power Research Institute

编辑信件的主要联系方式.
Email: lgwexe@163.com
台湾, Shijiazhuang 050021, Hebei

Siming Zeng

State Grid Hebei Electric Power Research Institute

Email: lgwexe@163.com
台湾, Shijiazhuang 050021, Hebei

Qing Wang

State Grid Hebei Electric Power Research Institute

Email: lgwexe@163.com
台湾, Shijiazhuang 050021, Hebei

Zhenwei Zhang

State Grid Hebei Electric Power Research Institute

Email: lgwexe@163.com
台湾, Shijiazhuang 050021, Hebei

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2. Fig. 1. Schematic representation of the model of the passage of a terahertz wave through the air—medium—metal system.

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3. Fig. 2. Cable samples: cable image (a); cross section (1 — conductive core; 2 — insulation layer of crosslinked polyethylene; 3 — protective layer) (b).

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4. Fig. 3. Installation diagram for terahertz spectroscopy.

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5. Fig. 4. Measurement of the cross-linked polyethylene insulation layer: measurement (a); cross-section (b); reflected terahertz pulse (c).

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6. Fig. 5. Measurement of the protective layer: measurement (a); cross section (b); reflected terahertz pulse (c).

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7. Fig. 6. Comparison of terahertz signals with/without immersion in water in a metal—rod sample model.

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8. Fig. 7. Measurement of the insulating layer and the protective layer: a sample wrapped in prepared wet paper and tin foil (a); the measured area (b).

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9. Figure 8. Comparison of the characteristics of terahertz pulses with and without immersion in water of a sample cable connector.

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10. Fig. 9. Terahertz image when immersed in an aqueous and anhydrous medium: terahertz image of the measured area (a); echo at z = 28 mm (b); echo at the interface at points A and B (c); terahertz image of the area wrapped in a shell (d).

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