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

Zhouyiao Zou, Yanpeng Hao, Fangyuan Tian, Yao Zheng, Weiming He, Lin Yang and Licheng Li
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Zhouyiao Zou: School of Electric Power, South China University of Technology, Guangzhou 510640, China
Yanpeng Hao: School of Electric Power, South China University of Technology, Guangzhou 510640, China
Fangyuan Tian: School of Electric Power, South China University of Technology, Guangzhou 510640, China
Yao Zheng: School of Electric Power, South China University of Technology, Guangzhou 510640, China
Weiming He: School of Electric Power, South China University of Technology, Guangzhou 510640, China
Lin Yang: School of Electric Power, South China University of Technology, Guangzhou 510640, China
Licheng Li: School of Electric Power, South China University of Technology, Guangzhou 510640, China

Energies, 2020, vol. 13, issue 5, 1-21

Abstract: 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 × 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.

Keywords: basin insulator; acoustoelastic effect; ultrasonic longitudinal waves; internal stress measurement (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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