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當前位置:首頁技術(shù)文章為什么要用大電流測量斷路器的回路電阻?

為什么要用大電流測量斷路器的回路電阻?

更新時間:2019-02-15點擊次數(shù):2160

為什么要用大電流測量斷路器的回路電阻?

電力系統(tǒng)許多大電流電氣設(shè)備在預防性試驗和交接試驗中需要準確測量回路的電阻值。斷路器是電力系統(tǒng)重要的電氣設(shè)備,國標GB763、GB50150和電力行業(yè)標準DL/T596對斷路器導電回路電阻的測量均作了規(guī)定:應(yīng)采用直流壓降法測量,電流不小于100A。

       斷路器導電回路的電阻主要取決于斷路器的動、靜觸頭間的接觸電阻。接觸電阻的存在,增加了導體在通電時的損耗,使接觸處的溫度升高,其值的大小直接影響正常工作時的載流能力,在一定程度上影響短路電流的切斷能力。因此,斷路器每相導電回路電阻值是斷路器安裝、檢修和質(zhì)量驗收的一項重要數(shù)據(jù)。

      接觸電阻的測量有許多種方法。日本學者Isao Minowa提出用超導量子器件測量接觸電阻,H.Archi提出利用電解槽法測量接觸電阻,波蘭學者Jerzy Kaczarek提出用三次諧波法測量接觸電阻,這些方法一般是在實驗室條件下進行電接觸研究所采用的方法。工程中,通常采用四端子法來測量實際觸點的接觸電阻。

      以前,通常采用直流雙臂電橋測量斷路器的接觸電阻。但是,當使用雙臂電橋進行斷路器導電回路電阻的測量時,由于雙臂電橋測量回路通過的是微弱的電流,難以消除電阻較大的氧化膜,測出的電阻示值偏大,但氧化膜在大的電流下很容易被擊穿,不妨礙正常電流通過。因此,測試采用直流壓降法測試時,電流不得太小。

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