电工技术学报  2025, Vol. 40 Issue (7): 2033-2042    DOI: 10.19595/j.cnki.1000-6753.tces.240346
电工理论 |
换流阀玻璃纤维增强塑料连接件械性能分析及在线无损评估方法
张新龙1, 邹延生2, 成立1, 陶博1, 廖瑞金1
1.输变电装备技术全国重点实验室(重庆大学) 重庆 400044;
2.中国南方电网有限责任公司超高压输电公司电力科研院 广州 510530
Mechanical Performance Analysis and Research on New Methods for Online Non-Destructive Evaluation of Glass Fiber Reinforced Plastic Connectors in Converter Valves
Zhang Xinlong1, Zou Yansheng2, Cheng Li1, Tao Bo1, Liao Ruijin1
1. State Key Laboratory of Power Transmission Equipment Technology Chongqing University Chongqing 400044 China;
2. Electric Power Research Institute EHV Company of CSG Guangzhou 510530 China
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摘要 玻璃纤维增强塑料(GFRP)连接件作为阳极饱和电抗器的支撑件是高压换流站内的重要部件之一,其机械性能对于换流站的安全至关重要。该文对近10年的GFRP连接件故障情况进行调研,共发现53起表面裂纹故障,并对随机抽取的3支裂纹GFRP连接件的机械性能进行了深入分析,研究了其开裂原因,针对性地提出了一种基于声发射(AE)的机械性能在线无损检测方法。首先,对全新和已出现裂纹的GFRP连接件进行理化分析,明确机械应力导致的物理损伤是机械强度失效的原因;其次,建立考虑实际振动情况的GFRP连接件三维仿真模型,分析开裂位置的应力大小,进一步明确故障原因;最后,提出一种基于声发射的机械性能在线无损检测方法,构建GFRP连接件机械性能评估方程。结果表明,裂纹GFRP连接件机械性能的评估结果与实际测试结果误差在1.4%~3.2%,表明声发射方法具备实现GFRP连接件机械性能在线无损评估的可行性。
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张新龙
邹延生
成立
陶博
廖瑞金
关键词 换流阀玻璃纤维增强塑料(GFRP)连接件裂纹分析声发射无损检测技术剩余机械强度评估    
Abstract:With the increase in operation time of high-voltage converter valves, there has been a significant issue of surface cracking observed in a large number of glass fiber reinforced plastic (GFRP) connectors. However, currently, there is limited research on the actual mechanism of GFRP connector cracking within converter stations, and the long-term mechanical performance remains unclear. Meanwhile, the assessment of its mechanical properties presently relies mainly on destructive offline testing, without the ability to accurately characterize its mechanical performance through online non-destructive testing methods. Acoustic emission (AE) methods enable real-time dynamic inspection of microcracks and represent a potential non-destructive testing method for evaluating the mechanical performance of GFRP equipment online. This paper investigates the cracking mechanism of GFRP connectors and employs acoustic emission technology to assess the residual mechanical strength of GFRP connectors. The results show that creep failure under long-term loading is the cause of physical damage to GFRP connectors; the evaluation mechanical performance of cracked GFRP connectors obtained through acoustic emission technology closely matches actual test results, with an error range of 1% to 3%.
Firstly, physical and chemical tests were conducted on both new and cracked GFRP connectors. The experimental results indicate that compared to the new GFRP connectors, the cracked ones do not exhibit significant chemical aging or thermal decomposition. However, they do present internal defects such as fiber breakage, matrix cracking, and fiber-matrix interface debonding, leading to a substantial decrease in mechanical performance. It was preliminarily confirmed that physical damage caused by mechanical stress is the primary reason for failure. Subsequently, a three-dimensional simulation model of the GFRP connectors was established using Ansys software. Simulation results indicate that under actual working conditions, the stress on the GFRP connectors is mainly concentrated at the actual crack locations, with the maximum stress reaching 47.3 MPa, exceeding their maximum load capacity (43.5 MPa), resulting in crack failure in that area. Additionally, the maximum stress exceeds 30% of the bending strength (122.3 MPa) of the GFRP connectors not yet in operation, meeting the premise of GFRP creep failure behavior, further validating that the cracking of GFRP connectors is caused by mechanical reasons. Finally, samples with different residual mechanical strengths were prepared through mechanical aging tests of varying durations. A weak acoustic signal detection platform was established, and the samples were subjected to acoustic emission loading tests using this platform.
The results of the acoustic emission loading tests show that there was no significant change in the residual mechanical strength of the samples before and after the tests, validating the non-destructive nature of acoustic emission detection method. Furthermore, under low-load conditions, the hit count rate increased approximately linearly with time, and the residual mechanical strength of the samples decreased linearly with the increase in hit count rate, with the slope and intercept of the negative linear relationship having an exponential relationship with the applied load. By utilizing the negative linear relationship between residual mechanical strength and hit count rate, the residual mechanical strength of cracked GFRP connectors can be quantitatively calculated. Compared to actual test values, the error range is only 1.4%~3.2%, indicating that acoustic emission detection technology is feasible for online evaluation of GFRP connectors.
Key wordsConverter valve    glass fiber reinforced plastic (GFRP) connector    crack analysis    acoustic emission non-destructive testing technology    residual mechanical strength assessment   
收稿日期: 2024-03-05     
PACS: TM211  
基金资助:国家重点研发计划资助项目(2021YFB2401705)
通讯作者: 成 立 男,1989年生,教授,博士生导师,研究方向为无损检测新方法、电力设备先进数字孪生技术、电气设备寿命评估、复合材料制备与改性等。E-mail:chengl16@cqu.edu.cn   
作者简介: 张新龙 男,1996年生,硕士研究生,研究方向为声发射无损检测技术在电力设备状态监测中的应用。E-mail:zxlcqu@cqu.edu.cn
引用本文:   
张新龙, 邹延生, 成立, 陶博, 廖瑞金. 换流阀玻璃纤维增强塑料连接件械性能分析及在线无损评估方法[J]. 电工技术学报, 2025, 40(7): 2033-2042. Zhang Xinlong, Zou Yansheng, Cheng Li, Tao Bo, Liao Ruijin. Mechanical Performance Analysis and Research on New Methods for Online Non-Destructive Evaluation of Glass Fiber Reinforced Plastic Connectors in Converter Valves. Transactions of China Electrotechnical Society, 2025, 40(7): 2033-2042.
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