一起10 kV電纜進水受潮缺陷分析及處理
秦慶雷，安星宇，楊臣，李蒸，孫浩，楊少博
(國網(wǎng)北京市電力公司亦莊供電公司，北京 100176)
摘 要：近年來配電 10 kV 電纜系統(tǒng)以其高可靠性、地下敷設(shè)等特點，在城市電網(wǎng)建設(shè)中得到了廣泛應(yīng)用。針對一起某 10 kV 電纜中間接頭進水受潮異常導(dǎo)致的電纜主絕緣爬電缺陷，通過絕緣電阻測量、串聯(lián)諧振耐壓試驗、超低頻介損試驗和 LIRA 線性寬頻阻抗譜試驗等進行診斷性分析，確定缺陷原因為電纜中間接頭密封不良導(dǎo)致進水受潮，進而引起主絕緣沿面爬電缺陷。為避免此類缺陷的發(fā)生，提出了嚴(yán)格電纜中間接頭質(zhì)量管控及做好電纜運行環(huán)境治理等后續(xù)處理建議與措施。
關(guān)鍵詞： 配電電纜；超低頻介損；電纜受潮；絕緣電阻；串聯(lián)諧振耐壓試驗；超低頻介損試驗；LIRA 線性寬頻阻抗譜試驗
中圖分類號：TM726.4 文獻標(biāo)識碼：B 文章編號：1007-3175(2024)12-0059-04
A 10 kV Cable Water Moisture Defect Analysis and Treatment
QIN Qing-lei, AN Xing-yu, YANG Chen, LI Zheng, SUN Hao, YANG Shao-bo
（State Grid Beijing Electric Power Company Yizhuang Power Supply Company, Beijing 100176, China）
Abstract: In recent years, the distribution 10 kV cable system has been widely used in the cons truction of urban power grids because of its high reliability and underground laying. Aiming at the main insulation creepage defect of a 10 kV cable caused by abnormal water and moisture in the middle connector, the diagnostic analysis was carried out by measuring insulation resistance, series resonance withstand voltage test, ultra-low frequency dielectric loss test and LIRA linear wide impedance spectrum test, then, it is determined that the cause of the defect is water moisture caused by poor sealing of the middle connector of the cable, which leads to the creepage defect of the main insulation along the surface. Thus, in order to avoid the occurrence of such defects, the following suggestions and measures are put forward, such as strict quality control of cable intermediate joints and good environmental management of cable operation.
Key words: distribution cable; ultra-low frequency dielectric loss; moisture in cable; insulation resistance; series resonance withstand voltage test; ultra-low frequency dielectric loss test; LIRA linear wideband impedance spectrum test
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