描述
短路通斷能力和短時(shí)耐受能力校驗(yàn)
低壓斷路器的額定短路分?jǐn)嗄芰皖~定短路接通能力應(yīng)不低于其安裝位置上的預(yù)期短路電流。當(dāng)動(dòng)作時(shí)間大于0.02s時(shí),可不考慮短路電流的非周期分量,即把短路電流周期分量有效值作為最大短路電流;當(dāng)動(dòng)作時(shí)間小于0.02s時(shí),應(yīng)考慮非周期分量,即把短路電流第一周期內(nèi)的全電流作為最大短路電流。如校驗(yàn)結(jié)果說(shuō)明斷路器通斷能力不夠,應(yīng)采取如下措施:
a)在斷路器的電源側(cè)增設(shè)其他保護(hù)電器(如熔斷器)作為后備保護(hù)。
b)采用限流型斷路器,可按制造廠提供的允通電流特性或限流系數(shù)(即實(shí)際分?jǐn)嚯娏鞣逯岛皖A(yù)期短路電流峰值之比)選擇相應(yīng)的產(chǎn)品。
c)可改選較大容量的斷路器。各種短路保護(hù)斷路器必須能在閉合位置上承載未受限制的短路電流瞬態(tài)值,還須能在規(guī)定的延時(shí)范圍內(nèi)承載短路電流。這種短時(shí)承載的短路電流值應(yīng)不超過(guò)斷路器的額定短時(shí)耐受能力,否則也應(yīng)采取措施或改變斷路器規(guī)格。斷路器產(chǎn)品樣本中一般都給出產(chǎn)品的額定峰值耐受電流和額定短時(shí)耐受電流(1s電流)。當(dāng)為交流電流時(shí),短時(shí)耐受電流應(yīng)以未受限制的短路電流周期分量的有效值為準(zhǔn)。
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