An Ultrasonic Longitudinal Through-Transmission Method to Measure the Compressive Internal Stress in Epoxy Composite Specimens of Gas-Insulated Metal-Enclosed Switchgear

被引：11

作者：

Zou, Zhouyiao ^{[1
]}

Hao, Yanpeng ^{[1
]}

Tian, Fangyuan ^{[1
]}

Zheng, Yao ^{[1
]}

He, Weiming ^{[1
]}

Yang, Lin ^{[1
]}

Li, Licheng ^{[1
]}

机构：

[1] South China Univ Technol, Sch Elect Power, Guangzhou 510640, Peoples R China

来源：

ENERGIES | 2020年 / 13卷 / 05期

基金：

中国国家自然科学基金;

关键词：

basin insulator; acoustoelastic effect; ultrasonic longitudinal waves; internal stress measurement; RESIDUAL-STRESS; VELOCITY;

D O I：

10.3390/en13051248

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

Situations of internal stress in basin insulators inside gas-insulated metal-enclosed switchgear (GIS) can lead to cracks, which can influence the safety and stability of apparatus. However, there is currently no research on internal stress measurements for composites of GIS basin insulators, and only measurements for surface stress. In this paper, an internal stress measurement method for GIS epoxy composite is proposed using an ultrasonic longitudinal through-transmission technique based on the acoustoelastic effect. An internal stress measurement system is developed to investigate the relationship between the uniaxial compressive internal stress and the velocity of the ultrasonic wave vertical to the stress in epoxy composite within a range of 0-70 MPa, and to calculate the acoustoelastic coefficient of epoxy composite. The effects of system delay are eliminated in measuring the propagation time. Some epoxy composite cuboid specimens with similar materials and using a manufacturing process similar to those of 252 kV GIS basin insulators are synthesized, and the uniformity of the internal stress in cuboid specimens is verified by finite element simulation. The results reveal a linear increase of the ultrasonic longitudinal wave velocity with increasing stress. It has been shown that the average acoustoelastic coefficient of GIS epoxy composites, using the longitudinal waves vertical to the stress, is 4.556 x 10(-5)/MPa. Additionally, the absolute errors of the internal stress measurements are less than 12.397 MPa. This research shows that the ultrasonic method based on the acoustoelastic effect for measuring the internal stress in GIS epoxy composites is feasible.

引用

页数：21