BOSCH 0261200079現(xiàn)貨
4.峰值耐受電流反映了斷路器承受由于短路電流產(chǎn)生電動力的耐受性能,它決定斷路器的導(dǎo)電部分和絕緣支撐件的機械強度以及觸頭的結(jié)構(gòu)形式。
5.操作性能
(1)全開斷時間 是指斷路器接到分閘命令瞬間起到電弧熄滅為止的時間間隔。即
(4-10-4)
式中 ——全開斷時間,s;
——分閘時間,s;從斷路器接到分閘命令瞬間到
所有相的觸頭都分離的時間間隔,亦稱為斷
路器固有分閘時間;
——燃弧時間,s;是指某一相首先起弧瞬間到所
有相電弧全部熄滅的時間間隔。
全開斷時間是說明斷
路器開斷過程快慢的主
要參數(shù),它直接影響故
障對設(shè)備的損壞程度、
故障范圍、傳輸容量和
系統(tǒng)的穩(wěn)定性。 斷路器開斷時間示意圖
(2)合閘時間 處于分閘位置的斷路器,從接
到合閘命令瞬間起到所有相的觸頭均接觸為止的
時間稱為合閘時間。
6.自動重合閘性能
自動重合閘的操作循環(huán):分— —合分— —合分。 為斷路器開斷故障電路,從電弧熄滅起到電路重新接通的時間,稱為無電流間隔時間,一般為0.3s或0.5s; 為強送電時間,一般為180s。
斷路器開斷時間與無電流間隔時間之和稱為自動重合閘時間。
金屬短接時間系指斷路器重合閘操作后,觸頭閉合到第二次觸頭分開所需用的時間。
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