Abstract
During the patrol inspection of a ±800 kV UHV transmission line, it was found that a tension clamp and a ground wire connecting pipe were cracked and failed. After the replacement of the failed fittings in combination with the outage maintenance, the macro inspection, radiographic testing, penetrant testing, spectral analysis, microscopic structure and fracture morphology analysis, water injection test and other comprehensive analysis were carried out on the failed fittings. It was found that the pipe orifice of the tension clamp and ground wire connecting tube rose due to the line slope, Rainwater will penetrate into the cavity area through the wire gap in the crimping area, and cannot be discharged in time. Under cold weather conditions, the accumulated water will frost heave, resulting in swelling and cracking in the non pressure area. Combined with the simulation results, it is verified that the stress level at the interface between freezing rain and cavity is large, and when the frost heave seriously exceeds the tensile limit of aluminum pipe, the aluminum pipe will crack; In the design stage of transmission line, it is proposed that the selection of tower location should try to avoid the rise of tension clamp nozzle and other rationalization suggestions.
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Lv, Y. et al. (2023). Cracking Failure Analysis of Tension Clamp and Connecting Tube of ± 800 kV UHV Transmission Line. In: Yang, Q., Dong, X., Ma, W. (eds) The proceedings of the 10th Frontier Academic Forum of Electrical Engineering (FAFEE2022). FAFEE 2022. Lecture Notes in Electrical Engineering, vol 1048. Springer, Singapore. https://doi.org/10.1007/978-981-99-3404-1_55
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DOI: https://doi.org/10.1007/978-981-99-3404-1_55
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