| Issue |
E3S Web Conf.
Volume 478, 2024
6th International Conference on Green Energy and Sustainable Development (GESD 2023)
|
|
|---|---|---|
| Article Number | 01001 | |
| Number of page(s) | 4 | |
| DOI | https://doi.org/10.1051/e3sconf/202447801001 | |
| Published online | 16 January 2024 | |
Study on Cracking Causes of One 500 kV SSY Type Equipment Clamp
1 Inner Mongolia Power (Group) Co., Ltd., Inner Mongolia Power Research Institute Branch, Hohhot 010020, China
2 Inner Mongolia Helin Power Generation CO.LTD, Hohhot 010020, China
* Corresponding author: dkyzjj@163.com
One SSY type equipment clamp serviced in a 500 kV station was found to be cracked. In this paper, the crcaked cause and mechanism is investigated by means of macroscopic morphology observation, fracture surface morphology observation, X-ray digital detection, metallographic observation. The results indicated that the main reason for the fracture of the equipment clamp this time is that the terminal board is a cast part, which contains a large number of casting defects such as porosity and shrinkage, resulting in a decrease in its effective cross-sectional area and load-bearing capacity. In addition, insufficient modification treatment of the terminal board led to insufficient toughness due to needle or rod-shaped eutectic silicon in the organization. Finally, under the combined action of dynamic load and self weight caused by the swinging of the wire in the wind, the terminal board was brittle fractured along the bolt hole with obvious stress concentration effect.
Key words: Al / clamp / fracture / casting / defect
© The Authors, published by EDP Sciences, 2024
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