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New approach in partial discharge diagnosis and maintenance of 22.9 kV XLPE power cables in service

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Abstract

Partial discharges (PDs) are one of the main causes of cable fault. Early detection and pre-analysis of PD characteristics are paramount in preventing cable breakdown. This paper analyzed the PD characteristics of 22.9 kilovolts (kV) calculated nerve conduction velocity (CN-CV) cross-linked polyethylene (XLPE) cable subjected to various artificial defects, based on the maintenance method by PD diagnosis. Various artificial defects were created in a 3-m CN-CV test cable to which a power frequency voltage of 60 hertz (Hz), 13.2 kV was applied. To compare the PD characteristics difference by cable length, a 3-m cable specimen was connected to a 70-m three-phase cable system using a high-voltage mating connector. A measurement unit and a high-frequency current transformer were used for PD data acquisition. As a result, different PD characteristics were found in each defect type, which provided better understanding of the PD phenomena. A maintenance method of 22.9 kV XLPE power cable through PD diagnosis was developed from the data obtained, which will help to ensure greater accuracy in the on-site diagnosis of a cable in service.

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  1. Korea Electrical Safety Corporation Research Institute, 12, Ogong-ro, Iseo-myeon, Wanju-gun, Jeollabuk-do, 55365, Republic of Korea

    Ji Man Park, Jeong Chay Jeon & Ga Ram Han

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  1. Ji Man Park
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  2. Jeong Chay Jeon
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  3. Ga Ram Han
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Correspondence to Jeong Chay Jeon.

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Park, J.M., Jeon, J.C. & Han, G.R. New approach in partial discharge diagnosis and maintenance of 22.9 kV XLPE power cables in service. Electr Eng 101, 1199–1209 (2019). https://doi.org/10.1007/s00202-019-00837-2

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