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零序電流互感器其核心特點可歸納為以下方面

更新時間:2025-08-25      瀏覽次數(shù):19
  零序電流互感器,又稱剩余電流互感器、接地電流互感器或漏電流互感器,是一種零序電流濾過器。它的基本原理基于基爾霍夫電流定律,即流入電路中任一節(jié)點的復電流的代數(shù)和等于零。在電力系統(tǒng)正常時,各相電流的矢量和為零(Ia+Ib+Ic=0),零序電流互感器的二次側繞組無信號輸出。但當發(fā)生接地故障時,各相電流的矢量和不再為零,而是等于漏電電流(Ia+Ib+Ic=Io>0),此時零序電流互感器的環(huán)形鐵芯中產(chǎn)生磁通,二次側感應出電壓,使執(zhí)行元件動作,達到接地故障保護的目的。
  零序電流互感器其核心特點可歸納為以下方面,結合其工作原理與實際應用場景進行系統(tǒng)闡述:
  一、高精度測量與寬范圍適應性
  測量精度優(yōu)化
  采用高精度互感器元件(如優(yōu)質進口鋼材制造的鐵芯),結合d特的零序繞法,有效抑制接地線路中不平衡電流的影響。例如,LXK-Φ120型號通過優(yōu)化磁路設計,將磁滯和渦流損耗降低至行業(yè)領x水平,確保在0.4KV至66KV電壓等級下,零序電流測量誤差小于±1%,滿足電力系統(tǒng)對故障電流精確檢測的需求。
  寬測量范圍覆蓋
  支持從微安級漏電電流到數(shù)千安級短路電流的檢測,覆蓋發(fā)電、輸電、配電全場景。以ZCT-∮120為例,其測量范圍可達0-1000A,二次側額定電流可選1A或5A,適應不同容量電力設備的保護需求。
  二、快速響應與高可靠性保護
  毫秒級動作速度
  當電網(wǎng)發(fā)生單相接地故障時,零序電流互感器可在10ms內檢測到3倍零序電流(即故障電流),并驅動繼電保護裝置動作。例如,在10KV線路中,LXK-Φ120型號的動作時間≤20ms,遠優(yōu)于國家標準要求的≤50ms,有效限制故障擴展范圍。
  抗干擾能力強化
  通過屏蔽層設計、電磁兼容(EMC)優(yōu)化等技術,消除諧波、暫態(tài)過電壓等干擾信號。實測數(shù)據(jù)顯示,在50Hz電網(wǎng)頻率下,其抗干擾能力可達10倍額定電流,確保在復雜電力環(huán)境中穩(wěn)定運行。
  絕緣與耐壓性能提升
  采用環(huán)氧樹脂或硅橡膠封裝,耐壓等級達10KV以上,局部放電量≤5pC。例如,ZCT-∮120型號在1分鐘工頻耐壓試驗中,可承受42KV電壓無擊穿,保障設備與人員安全。
  三、結構優(yōu)化與便捷安裝
  緊湊化設計
  體積較傳統(tǒng)互感器縮小40%,重量減輕30%。以LXK-Φ120為例,其外徑僅120mm,高度85mm,可直接嵌入開關柜或緊湊型配電箱,節(jié)省空間達60%以上。
  多樣化安裝方式
  整體式:需在電纜敷設前預穿,適用于新建項目。例如,在電纜隧道中,整體式互感器可與電纜同步安裝,減少后期改造成本。
  開口式:支持分體安裝,無需斷開電路。在工業(yè)廠房改造中,開口式設計可快速加裝于運行中的電纜,工期縮短至1天內。
  標準化接口設計
  采用IEC 61850標準接口,支持與微機保護裝置、小電流接地選線裝置無縫對接。例如,ZCT-∮120型號配備RS485通信模塊,可實時上傳零序電流數(shù)據(jù)至監(jiān)控系統(tǒng),實現(xiàn)故障預警與遠程操控。
  四、環(huán)境適應性與長壽命設計
  寬溫域運行能力
  工作溫度范圍覆蓋-40℃至+80℃,適應極寒或高溫環(huán)境。在西北地區(qū)風電場中,零序電流互感器需在-30℃低溫下穩(wěn)定運行,其低溫啟動性能優(yōu)于行業(yè)標準20%。
  防潮抗污閃特性
  外殼采用疏水涂層技術,接觸角>120°,有效防止凝露和污穢附著。在沿海潮濕環(huán)境中,其絕緣電阻可長期保持>1000MΩ,降低閃絡風險。
  20年設計壽命
  通過材料老化試驗驗證,其核心部件(如鐵芯、線圈)在25℃環(huán)境下壽命達20年。例如,LXK-Φ120型號在加速老化試驗中,經(jīng)10年等效運行后性能衰減<5%,顯著低于行業(yè)平均水平。
  • 企業(yè)名稱:

    上海韓施電氣自動化設備有限公司

  • 聯(lián)系電話:

    021-62308119

  • 公司地址:

    上海市寶山區(qū)市一路199號1樓2392A

  • 企業(yè)郵箱:

    [email protected]

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