Optoelectronic Technology, Volume. 42, Issue 2, 81(2022)
Φ‑OTDR‑based On‑line Monitoring Method for Overhead Transmission Line Icing
Figures & Tables(17)
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
Table 1. Comparison of theoretical values of parameters calculated by catenary method with those simulated by finite element method
View tableView in ArticleTable 1. Comparison of theoretical values of parameters calculated by catenary method with those simulated by finite element method
参数名称 悬链线法 有限元法 误差/（‰） 水平张力/N 10 000 10 000.659 5 0.07 最大张力/N 10 040.866 10 041.076 2 0.02 跨中弧垂/m 4.521 9 4.519 3 0.5 索长/m 200.272 4 200.272 1 0.001 5
Table 2. Natural frequencies of out‑of‑plane vibration under different horizontal tensions
View tableView in ArticleTable 2. Natural frequencies of out‑of‑plane vibration under different horizontal tensions
水平张力/N 9 000 10 000 11 000 12 000 13 000 000 第一振型 0.247 0.260 0.273 0.285 0.297 第二振型 0.493 0.520 0.546 0.570 0.594 第三振型 0.740 0.781 0.819 0.855 0.891 第四振型 0.987 1.041 1.09 1.14 1.18
Table 3. Natural frequencies of in-plane vibration under different horizontal tensions
View tableView in ArticleTable 3. Natural frequencies of in-plane vibration under different horizontal tensions
水平张力/N 9 000 10 000 11 000 12 000 13 000 对称
第一振型
/ / / 0.563 0.541 反对称
第一振型
0.492 0.519 0.545 0.569 0.593 对称
第二振型
0.628
/0.837
0.612
/0.836
0.587
/0.854
0.880 0.909 反对称
第二振型
0.987 1.040 1.092 1.141 1.187 对称
第三振型
1.245 1.309 1.370 1.430 1.488
Table 4. Equivalent densities of conductor with different icing thicknesses
View tableView in ArticleTable 4. Equivalent densities of conductor with different icing thicknesses
覆冰厚度/mm 等效密度/(103 kg·m-3) 4 4.274 0 8 5.534 0 12 7.121 9 16 9.037 6 20 11.281 3
Table 5. Natural frequencies of overhead conductors with different icing thicknesses under initial horizontal tension of 10 000 N
View tableView in ArticleTable 5. Natural frequencies of overhead conductors with different icing thicknesses under initial horizontal tension of 10 000 N
阶数 覆冰厚度/mm 4 8 12 16 20 f/Hz 1 0.255 26 0.249 40 0.243 29 0.237 22 0.231 37 2 0.509 23 0.497 41 0.485 07 0.472 82 0.460 99 3 0.510 37 0.498 63 0.486 39 0.474 25 0.462 52 4 0.578 07 0.543 90 0.512 97 0.486 04 0.462 86 5 0.765 54 0.747 93 0.729 57 0.711 35 0.693 76 6 0.809 07 0.782 50 0.757 92 0.735 34 0.714 61
Table 6. Performance parameters of Ada‑5032E
View tableView in ArticleTable 6. Performance parameters of Ada‑5032E
性能指标 最小值 典型值 最大值 监测距离/km 0.1 60 80 测频范围/Hz 0.1 10 10 000 空间分辨率/m 4 10 50 空间定位精度/m
Table 7. Icing index and reciprocal of its square root
View tableView in ArticleTable 7. Icing index and reciprocal of its square root
涂胶层数 覆冰指数n n-1/2 f/Hz 0 1 1 2.267 1 2 0.707 2.067 2 3 0.577 1.833 3 4 0.5 1.667 4 5 0.447 1.567 5 6 0.408 1.467 6 7 0.378 1.367 7 8 0.353 6 1.267
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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
Paper Information
Category: Technology and Measurement
Received: Dec. 21, 2021
Accepted: --
Published Online: Jul. 29, 2022
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