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長延時(shí)過電流脫扣器整定電流應(yīng)大于線路中計(jì)算電流
（4-10-9）
式中 ——過電流脫扣器的長延時(shí)動作整定電
流值，A；
——可靠系數(shù)，一般取1.1；
——線路的計(jì)算電流，單臺電動機(jī)是指
電動機(jī)的額定電流，A。
10.5 低壓斷路器
校驗(yàn)一：長延時(shí)過電流脫扣器在配電線路過載時(shí)的可靠性。如對電動機(jī)進(jìn)行保護(hù)，則電動機(jī)在過載 20％時(shí)應(yīng)使保護(hù)裝置動作；
校驗(yàn)二：在配電線路出現(xiàn)尖峰負(fù)荷時(shí)或在電動機(jī)起動時(shí)，長延時(shí)過電流脫扣器不誤動。脫扣器在3倍整定電流值下的可返回時(shí)間，取決于線路中尖峰電流的持續(xù)時(shí)間，也就是線路中大容量的異步電動機(jī)直接起動的持續(xù)時(shí)間。
一般情況下，電動機(jī)的輕載起動時(shí)間不超過2.5～4s，電動機(jī)滿載起動時(shí)間不超過6～8s，個別電動機(jī)重載起動時(shí)間達(dá)15s。返回時(shí)間越小，說明線路電流大于長延時(shí)脫扣器整定電流值的倍數(shù)越高，保護(hù)裝置的動作越快。
10.5 低壓斷路器
（5）分?jǐn)嗄芰?br />
1）斷路器額定短路分?jǐn)嗄芰?yīng)大于線路中大短路電流。
2）斷路器的額定極限短路分?jǐn)嗄芰?yīng)大于斷路器額定運(yùn)行短路分?jǐn)嗄芰Γ▽τ谥绷麟娏骶€路，兩者的數(shù)值相同）。分?jǐn)嗄芰κ侵傅蛪簲嗦菲髟谝?guī)定的試驗(yàn)（如電壓、頻率、線路其它參數(shù)等）條件下，能夠接通成切斷短路電流的數(shù)值。分?jǐn)?/p>
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