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(yè)技術(shù)學(xué)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(diào)試運行大負荷用電設(shè)備時出現(xiàn)線路壓降偏大、三相電流運行不平衡、設(shè)備接地線路接地電流異?,F(xiàn)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(chǎn)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(jié)合實際測量并進行問題排查,論證了造成以上現(xiàn)象的主要因素。經(jīng)過現(xiàn)場問題的排查和總結(jié),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(guān)鍵詞:接地電流;電磁感應(yīng);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
參考文獻
[1] 劉剛,熊小伏,廖瑞金,等. 基于不同檢測方法的高壓電流互感器誤差比較與分析[J]. 電力自動化設(shè)備,2019,39(3):103-107.
[2] 中國電力企業(yè)聯(lián)合會.1 100 kV高壓交流斷路器:GB/T 24838—2018[S]. 北京: 中國標準出版社,2018:17.
[3] 張偉剛,張保會,胡海松,等. 應(yīng)用小波包分析實現(xiàn)配電網(wǎng)單相接地故障選線[J]. 電力系統(tǒng)自動化,2009,33(23):60-64.
[4] 安濱.1 000 kV GIS設(shè)備故障檢測及實例分析[J].電工電氣,2019(8):46-49.
[5] 曲軼龍,譚偉璞,楊以涵. 基于形態(tài)濾波的諧振接地系統(tǒng)故障選線新方法[J]. 電力系統(tǒng)自動化,2008,32(12):73-77.
[6] 張鈞,何正友,賈勇. 基于S變換的故障選線新方法[J]. 中國電機工程學(xué)報,2011,31(10):109-115.
[7] 胡全義,秘立鵬,劉天奇,等. 一起GIS設(shè)備漏氣及現(xiàn)場交流耐壓試驗擊穿故障分析[J]. 電工電氣,2017(8):112-116.
[8] 魏向向,溫渤嬰. 基于2階累加生成相關(guān)性的諧振接地系統(tǒng)故障選線方法[J]. 電網(wǎng)技術(shù),2017,41(5):1674-1682.