Abstract
Power-on inspection (POI) is a method to detect abnormalities in vacuum circuit breakers (VCBs) in a live wire state. However, owing to the absence of clear assessment criteria, POI cannot often be applied to assess the condition of VCBs in operation. Therefore, this paper presents novel risk-level assessment criteria for POI using transient earth voltage (TEV) measurements for in-service VCBs. In particular, vacuum interrupters and push-rod defects are artificially manufactured and inserted in each phase of a VCB. Additionally, a vacuum chamber with a structure similar to that of an actual VCB, with variable pressure from 0.133 to 101,325 Pa (1 atm), is fabricated, and TEV measurement data are collected. In addition, on-site measurement results are analyzed and applied to strengthen the basis of the assessment criteria. Thus, the assessment criteria for VCBs in service and defect type estimation are obtained based on an analysis of the experimental and on-site results.
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This research was performed with the support of Korea Electrical Safety Corporation.
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JMP was involved in investigation, methodology, resources, validation and writing an original draft. GRH was involved in software and visualization. JCJ was involved in conceptualization. HSL was involved in data curation. DHC prepared measurements. JMP, JCJ, HSL and DHC prepared figures and review and editing.
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Park, J.M., Jeon, J.C., Han, G.R. et al. Reliable risk-level assessment criteria for vacuum circuit breakers in operation based on transient earth voltage measurements. Electr Eng 105, 593–603 (2023). https://doi.org/10.1007/s00202-022-01676-4
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DOI: https://doi.org/10.1007/s00202-022-01676-4