Fei XIONG, Zhenhua XING, Yixin ZHANG, Dao ZHANG, Yaze CHEN, Xing FANG, Xuping ZHANG, Feng WANG. Φ‑OTDR‑based On‑line Monitoring Method for Overhead Transmission Line Icing[J]. Optoelectronic Technology, 2022, 42(2): 81
- Optoelectronic Technology
- Vol. 42, Issue 2, 81 (2022)
Fig. 1. The phase discrimination principle of Φ-OTDR
Fig. 2. Initial configuration of overhead power transmission line
Fig. 3. Schematic of icing simulation device
Fig. 4. Time domain and frequency spectra of phase difference in three phase discrimination intervals
Fig. 5. Frequency spectra of phase difference after falling of weights with different masses at the midpoint
Fig. 6. The vibration spectra of suspended optical fiber with different mid-span sags
Fig. 7. The relationship between the natural frequency of suspended fiber and the mid-span sag
Fig. 8. Compact fiber coated with different layers of silicone rubber
Fig. 9. Spectra of phase difference signal under no coating and different layers of coating with silicone rubber
Fig. 10. The relationship between the natural frequency of suspended optical fiber and the number of coating layers
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Table 1. Comparison of theoretical values of parameters calculated by catenary method with those simulated by finite element method
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Table 2. Natural frequencies of out‑of‑plane vibration under different horizontal tensions
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Table 3. Natural frequencies of in-plane vibration under different horizontal tensions
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Table 4. Equivalent densities of conductor with different icing thicknesses
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Table 5. Natural frequencies of overhead conductors with different icing thicknesses under initial horizontal tension of 10 000 N
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Table 6. Performance parameters of Ada‑5032E
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Table 7. Icing index and reciprocal of its square root
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