Suzhou Electric Appliance Research Institute
期刊號: CN32-1800/TM| ISSN1007-3175

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低壓電纜橋架振動與接地線電流異常原因分析

來源:電工電氣發布時間:2020-11-19 14:19 瀏覽次數:115
低壓電纜橋架振動與接地線電流異常原因分析
 
王亞青1,張國興2,劉惠姣3
(1 保定電力職業技術學院,河北 保定 071051;2 中冀電力集團股份有限公司,河北 保定 071051;3 鼎陽智電慧服科技股份有限公司,河北 保定 071051)
 
    摘 要:某電力施工工程,調試運行大負荷用電設備時出現線路壓降偏大、三相電流運行不平衡、設備接地線路接地電流異常現象,且電纜橋架有劇烈振動并伴隨較大的工頻噪聲,通過對線路阻抗電壓、二次電流產生的原因、運行電纜相互作用力等方面的理論計算和原理分析,結合實際測量并進行問題排查,論證了造成以上現象的主要因素。經過現場問題的排查和總結,糾正了施工過程中工藝的錯誤,并給出了正確的施工工藝,消除了運行隱患。
    關鍵詞:接地電流;電磁感應;磁動勢;相互作用力;交變磁場
    中圖分類號:TM726.4     文獻標識碼:B     文章編號:1007-3175(2020)11-0044-05
 
Analysis on the Cause of the Vibration and the Abnormal Current of Grounding System of Low Voltage Cable Bridge
 
WANG Ya-qing1, ZHANG Guo-xing2, LIU Hui-jiao3
(1 Baoding Electric Power VOC.&TECH. College, Baoding 071051, China;
2 Zhongji Power Group Co., Ltd, Baoding 071051, China;
3 Dinyoung Intelligent Electric Power Service Technology Co., Ltd, Baoding 071051, China)
 
    Abstract: In an electric power construction project, when debugging and operating heavy load electric equipment, there are large line voltage drop, unbalanced operation of three-phase current, abnormal grounding current of equipment grounding line, and violent vibration of cable bridge accompanied by large power frequency noise.Through theoretical calculation and principle analysis on the causes of line impedance voltage, secondary current, interaction force of operating cable, combined with the actual measurement and troubleshooting, the main factors causing the above phenomenon are demonstrated.Through the investigation and summary of the field problems, the errors in the process of construction are corrected, and the correct construction process is given, which eliminates the operation hidden dangers, promotes the progress of the construction technology of the construction party to a certain extent, and better guarantees the safe operation of the equipment.
    Key words: grounding current; electromagnetic induction; magnetomotive force; interaction force; alternating magnetic field
 
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