换流阀玻璃纤维增强塑料连接件的机械性能分析及在线无损评估方法  

Mechanical Performance Analysis and Research on New Methods for Online Non-Destructive Evaluation of Glass Fiber Reinforced Plastic Connectors in Converter Valves

作　　者：张新龙 邹延生 成立 陶博 廖瑞金[1] Zhang Xinlong;Zou Yansheng;Cheng Li;Tao Bo;Liao Ruijin(State Key Laboratory of Power Transmission Equipment Technology,Chongqing University,Chongqing,400044,China;Electric Power Research Institute,EHV Company of CSG,Guangzhou,510530,China)

机构地区：[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

出　　处：《电工技术学报》2025年第7期2033-2042,共10页Transactions of China Electrotechnical Society

基　　金：国家重点研发计划资助项目(2021YFB2401705)。

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。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 t

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 

分 类 号：TM211[一般工业技术—材料科学与工程]