作者:季宁1, 李世倩1, 任罡1, 胡晓丽1, 陶红鑫1, 魏蔚1, 孙吕祎1, 屠骏2, 张梦梦1, 陶锴3
作者单位:1. 国网江苏省电力有限公司技能培训中心,江苏 苏州 215004;
2. 国网江苏省电力有限公司常州供电公司,江苏 常州 213003;
3. 南京邮电大学,江苏 南京 210023
关键词:变压器基底;渗水损伤;声发射;乐谱化采样;Frechet距离
摘要:
针对仿真变电站外场主变压器载荷对基底带来的潜在渗水损伤问题,该文提出一种基于声发射乐谱化Frechet编码的基底渗水损伤监测方法。首先对监测包络信号开展乐谱化特征提取,将声发射信号转换为音高、音值和压缩比指标,开展超声信号特征离散化提取。然后,构造乐谱指标Frechet相似判别对照组,实现渗水损伤层级识别。利用达西定律开展变压器应力激励下的基底水文分布数值模拟,采用单轴压缩实验模拟粉砂基底工况并激发声发射,结果显示此方法对四种渗水损伤层级的识别准确率为92.5%,且可将监测数据压缩至43.4%。该方法可实现人耳不可感知超声信号到可听声的折换,为人员活动频繁的工况场地带来更为直观的预警思路,并可减小存储资源消耗和带宽传输压力。
Water seepage damage monitoring of substation main transformer base based on acoustic emission musicalized Frechet coding
JI Ning1, LI Shiqian1, REN Gang1, HU Xiaoli1, TAO Hongxin1, WEI Wei1, SUN Lüyi1, TU Jun2, ZHANG Mengmeng1, TAO Kai3
1. Technican Training Center of State Grid Jiangsu Electric Power Co., Ltd., Suzhou 215004, China;
2. Changzhou Power Supply Company, State Grid Jiangsu Electric Power Co., Ltd., Changzhou 213003, China;
3. Nanjing University of Posts and Telecommunications, Nanjing 210023, China
Abstract: The maintransformerload of simulation substation puts a potential seepage damage issue to the basement. In this research, a seepage damage monitoring method was proposed based on the musicalized acoustic emission Frechet encoding. First, the acoustic emission signal was converted into pitch, tone and compression ratio. The feature of ultrasonic signal was extracted discretely. Subsequently, Frechet similarity criterion was constructed to realize the seepage damage level identification. Numerical simulation of the basement moisture distribution under the stress of transformer by Darcy law was carried. Uniaxial compression was used to simulate the working condition of silty sand basement. The experiment showed the accuracy of this method for seepage damage identification was 92.5%. The monitoring data was compressed to 43.4%. This method can convert the imperceptible ultrasonic signal to audible sound, which gives a novel warning idea for the working conditions. Moreover, the storage consumption and bandwidth transmission pressure can be reduced.
Keywords: transformer basement;seepage damage;acoustic emission;musicalized sampling;Frechet distance
2023, 49(2):42-49 收稿日期: 2021-09-03;收到修改稿日期: 2021-11-03
基金项目: 国家自然科学基金项目(61701250);国网江苏省电力有限公司科技项目(J2021020)
作者简介: 季宁(1985-),女,黑龙江五常市人,高级讲师,研究方向为电网调控运行与电力系统仿真、智能检测与控制
参考文献
[1] 刘先珊, 王科, 许明. 低渗储层砂岩渗流-应力-损伤渐裂过程的渗透特性演化研究[J]. 岩土工程学报, 2018, 40(9): 1584-1592
[2] 贾海梁, 王婷, 项伟, 等. 含水率对泥质粉砂岩物理力学性质影响的规律与机制[J]. 岩石力学与工程学报, 2018, 37(7): 1618-1628
[3] 杜宇翔, 盛谦, 付晓东, 等. 半成岩变形强度特征与损伤本构模型研究[J]. 岩石力学与工程学报, 2020, 39(2): 239-250
[4] ZHENG W, TAO K, JIANG W. Automatic pattern identification of rock moisture based on the Staff-RF model[J]. Journal of Geophysics and Engineering, 2017, 15(2): 438-448
[5] 张鹏林, 杨超, 董拴涛, 等. 基于Lamb波的风电叶片复合材料声发射源定位研究[J]. 中国测试, 2019, 45(7): 140-146
[6] TAO K, ZHENG W. Real-time damage assessment of hydrous sandstone based on synergism of AE-CT techniques[J]. Engineering Failure Analysis, 2018, 91: 465-480
[7] KIM J S, LEE K S, CHO W J, et al. A comparative evaluation of stress-strain and acoustic emission methods for quantitative damage assessments of brittle rock[J]. Rock Mechanics and Rock Engineering, 2015, 48(2): 495-508
[8] CARPINTERI A, LACIDOGNA G, NICCOLINI G, et al. Critical defect size distributions in concrete structures detected by the acoustic emission technique[J]. Meccanica, 2008, 43(3): 349-363
[9] 张琦, 杨录, 李勇峰, 等. 钼合金高温特性超声导波检测方法研究[J]. 中国测试, 2020, 46(3): 150-163
[10] 薛光辉, 刘昊, 何毛宁. 基于超声波的压接质量检测方法研究[J]. 中国测试, 2020, 46(6): 39-43
[11] TAO K, ZHENG W. An anthropomorphic fuzzy model for the time-spatial assessment of sandstone seepage damage[J]. Automation in Construction, 2020, 109: 102989.1-102989.16
[12] TAO K, ZHENG W. Structural damage location and evaluation model inspired by memory and causal reasoning of the human brain[J]. Structural Control and Health Monitoring, 2018, 25(11): 2249.1-2249.15
[13] WENG H, WANG S, WAN Y, et al. Discrete Fréchet distance algorithm based criterion of transformer differential protection with the immunity to saturation of current transformer[J]. International Journal of Electrical Power and Energy Systems, 2020, 115: 105449.1-105449.9
[14] SHEIKHOLESLAMI M. Application of Darcy law for nanofluid flow in a porous cavity under the impact of Lorentz forces[J]. Journal of Molecular Liquids, 2018, 266: 495-503
[15] WANG P, SHU C, SHI F, et al. Orthogonal experimental study of similar materials properties of different densities, sand-binder ratios and residual moisture contents[J]. Rock and Soil Mechanics, 2017, 38: 229-235
[16] 方钱宝, 马建林, 喻渝, 等. 大断面黄土隧道围岩弹性抗力系数、变形模量与压缩模量试验研究[J]. 岩石力学与工程学报, 2009, 28(z2): 3932-3937