150-B180NCDD現貨
2.(2)把額定條件下的開斷能力稱為額定斷流容量。三相電路的額定斷流容量,以
(MVA)表示。
我國根據國際電工委員會(IEC)的規定,現只把額定開斷電流作為表征開斷能力的參數,而斷流容量僅作為描述斷路器特性的一個數值。
3.關合能力
說明斷路器關合短路故障能力的參數為額定關合電流。其數值以關合操作時,瞬態電流個大半波峰值來表示,制造部門對關合電流一般取額定開斷電流的 倍即
(4-10-1)
式中 ——額定關合電流,kA;
——額定開斷電流,kA。
斷路器關合短路電流的能力除與滅弧裝置性能有關外,還與斷路器操動機構的合閘功率的大小有關。
耐受性能
斷路器應具有足夠的耐受短時短路電流作用的能力,簡稱耐受能力。
(1)短時熱電流(熱穩定電流) 在規定的時間內(規定標準時間為2s,需要大于2s時推薦4s)斷路器在合閘位置,可能經受的短時熱電流有效值(kA),稱為短時熱電流(或短時耐受電流),斷路器標準中規定
(4-10-2)
短時熱電流通過斷路器時,各零部件的溫度不應超過短時發熱高允許溫度,且不致出現觸頭熔接或軟化變形,以及其它妨礙正常運行的異常現象。允許發熱高溫度數值隨材料而異。
(2)峰值耐受電流 峰值耐受電流亦稱動穩定電流,即在規定的使用條件和性能下,斷路器在合閘位置時所能經受的電流峰值。它與關合電流不同的是,峰值耐受電流是斷路器處于合閘位置時通過的短路電流,而關合電流則是由于斷路器關合短路故障所產生的短路電流。峰值耐受電流也是以短路電流的個大半波峰值電流來表示,且
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