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原裝羅克韋爾A-B接觸器 等全系列西北總代理 歡迎來電！
v 陜西欣鴻然自動化設(shè)備有限公司
v 聯(lián)系人:寧輝
v 熱 線：029-83338940
v 手 機：18049484083
v Q Q:271968858 Q Q:1067802570
v 傳真:029-83561013
進口系列低壓真空交流接觸器廣泛適用于，煤礦，電力，冶金，紡織。高層建筑等各種行業(yè)部門。
低壓真空交流接觸器適用于交流：50HZ.額定電壓：1140V,額定電流63至630A的饋電網(wǎng)絡(luò)，供遠距離接通和分斷電路，以及頻繁起動和停止交流電動機之用。特別適宜與各種保護裝置配合組裝成隔爆型電磁起動器。
一種高壓真空接觸器
真空接觸器主要由真空滅弧室和操作機構(gòu)組成。真空滅弧室具有通過正常工作電流和頻繁切斷工作電流時可靠滅弧兩個作用。但不能切斷過負荷電流和短路電流。操作機構(gòu)是由帶鐵芯的吸持線圈和銜鐵構(gòu)成。線圈通電，吸引銜鐵，接觸器閉合；線圈失電，接觸器斷開。吸持線圈一般有直流和交流兩種形式。
真空滅弧室的外殼用玻璃或陶瓷絕緣材料制成，內(nèi)部的真空度通常在0.01Pa以上。由于殼內(nèi)的空氣少，觸頭開距可以做得很小，電弧也較容易被熄滅。觸頭材料一般用銅、銻、鋨等合金制成。滅弧室內(nèi)屏蔽罩的作用是，當分斷電流時，凝結(jié)觸頭間隙中擴散出來的金屬蒸汽，有助于熄弧，還可以防止金屬蒸汽濺落到絕緣外殼上降低其絕緣強度。動觸頭與外殼下端用波紋管連接，動觸頭可以上下運動又不會漏氣。
真空接觸器通常由絕緣隔電框架、金屬底座、傳動拐臂、電磁系統(tǒng)、輔助開關(guān)和真空開關(guān)管等部件組成。當電磁線圈通過控制電壓時，銜鐵帶動拐臂轉(zhuǎn)動，使真空開關(guān)管內(nèi)主觸頭接通，電磁線圈斷電后，由于分閘彈簧作用，使主觸頭分斷。
真空開關(guān)管是以上封蓋、下封蓋、金屬波紋管和陶瓷管等組成，該真空開關(guān)管，外殼采用95瓷絕緣材料制成波紋式的瓷管，它具有爬電距離大、機械強度高、耐熱和耐沖擊的特點。真空開關(guān)管內(nèi)封裝一對動靜觸頭，觸頭材料采用耐磨且低截流值的Cu－W－Wc，這樣在滿足開斷性能的條件下，減小開斷過程中由于截流引起的過電壓，提高了真空開關(guān)管的使用電壽命。當金屬波紋管軸向運動時帶動動觸頭做分合閘動作。
電磁系統(tǒng)考慮實際吸力特性和反力特性良好配合，以及發(fā)揮接觸器運行時噪音低、節(jié)電的優(yōu)點，采用滯留雙線圈由起動和維持兩繞組組成，通過輔助開關(guān)切換，為了便于用戶進行交流電源操作，接觸器帶有橋式整流裝置。
機械鎖扣：當閉合線圈通電時，接觸器吸合，機械鎖扣鎖?。寒斆摽劬€圈通電時，機械鎖扣脫扣，接觸器釋放，脫扣線圈在熱態(tài)時，其電壓在Us85%－110%范圍內(nèi)使接觸器可靠釋放。
真空接觸器熄弧能力強，耐壓性能好，操作頻率較高，壽命長，無電弧外噴，體
真空接觸器線路圖
積小、重量輕、維修周期較長。真空接觸器的真空滅弧室制造時工藝要求很高，如果工藝不良，滅弧室的真空容易下降。觸頭材料材質(zhì)不好，在分斷電流時會出現(xiàn) "截流過電壓"現(xiàn)象，即在分斷電流時，由于真空滅弧室的熄弧能力很強，電弧電流不是自然過零時切斷，而是從電流的某一值突然降到零，由此而出現(xiàn)高的過電壓。截流電壓會危及電氣設(shè)備的安全運行。
· ≮本公司將期待您的來電咨詢≯
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