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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(jù)國際電工委員會（IEC）的規(guī)定，現(xiàn)只把額定開斷電流作為表征開斷能力的參數(shù)，而斷流容量僅作為描述斷路器特性的一個數(shù)值。
3．關(guān)合能力
說明斷路器關(guān)合短路故障能力的參數(shù)為額定關(guān)合電流。其數(shù)值以關(guān)合操作時，瞬態(tài)電流個大半波峰值來表示，制造部門對關(guān)合電流一般取額定開斷電流的 倍即
（4-10-1）
式中 ——額定關(guān)合電流，kA；
——額定開斷電流，kA。
斷路器關(guān)合短路電流的能力除與滅弧裝置性能有關(guān)外，還與斷路器操動機(jī)構(gòu)的合閘功率的大小有關(guān)。
耐受性能
斷路器應(yīng)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(wěn)定電流） 在規(guī)定的時間內(nèi)（規(guī)定標(biāo)準(zhǔn)時間為2s，需要大于2s時推薦4s）斷路器在合閘位置，可能經(jīng)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(biāo)準(zhǔn)中規(guī)定
（4-10-2）
短時熱電流通過斷路器時，各零部件的溫度不應(yīng)超過短時發(fā)熱高允許溫度，且不致出現(xiàn)觸頭熔接或軟化變形，以及其它妨礙正常運(yùn)行的異?，F(xiàn)象。允許發(fā)熱高溫度數(shù)值隨材料而異。
（2）峰值耐受電流 峰值耐受電流亦稱動穩(wěn)定電流，即在規(guī)定的使用條件和性能下，斷路器在合閘位置時所能經(jīng)受的電流峰值。它與關(guān)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(guān)合電流則是由于斷路器關(guān)合短路故障所產(chǎn)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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