1606-XLSDNET8現(xiàn)貨
福州聚福興自動(dòng)化有限公司主要從事工業(yè)自動(dòng)化過程控制系統(tǒng)的工程設(shè)計(jì)、施工、調(diào)試并提供的后續(xù)服務(wù)。是福克斯波羅FOXBORO華南地區(qū)產(chǎn)品總代理和歐陸的代理, 系統(tǒng)集成商及工程售后服務(wù)中心及ROCKWELL產(chǎn)品銷售中心。主要產(chǎn)品包括智能壓力變送器、工業(yè)調(diào)節(jié)器、流量計(jì)、多路巡檢儀、無紙記錄儀、分析儀、溫度控制柜及DCS控制系統(tǒng),福克斯波羅Foxboro I/A DCS卡件:FBM201 FBM202 FBM203 FBM204 FBM205 FBM206 FBM207 FBM211FBM221 CP60 FBM01 FBM02 FBM03 FBM06 FBM07 FBM09 FCM10E等DCS備件。所有產(chǎn)品均以極高的精確度和穩(wěn)定性保證可靠的測量,詳細(xì)信息歡迎來電咨詢
式中 ——瞬時(shí)或短時(shí)過電流脫扣器整定電流值,A;
——可靠系數(shù),對動(dòng)作時(shí)間大于0.02s的斷路器,K
取1.35,對動(dòng)作時(shí)間小于0.02s的斷路器K取
1.7~2.0;
——電動(dòng)機(jī)的起動(dòng)電流,A。
10.5 低壓斷路器
2)當(dāng)配電線路不考慮電動(dòng)機(jī)的起動(dòng)電流時(shí),按下式計(jì)算整定值
(4-10-8)
式中 ——配電線路的尖峰電流,A;
——可靠系數(shù),一般取1.35。
3)當(dāng)配電線路考慮電動(dòng)機(jī)的起動(dòng)電流時(shí),按下式計(jì)算整定值
(4-10-9)
式中 ——正常工作電流和可能出現(xiàn)的自起動(dòng)電機(jī)
的起動(dòng)電流的總和,A。
10.5 低壓斷路器
(3)短時(shí)過電流脫扣器的整定電流
確定本級斷路器短延時(shí)過電流脫扣器動(dòng)作電流的整定,應(yīng)與下一級開關(guān)整定電流選擇性配合。本級動(dòng)作整定電流應(yīng)大于或等于下一級低壓斷路器短延時(shí)或瞬時(shí)動(dòng)作整定值的1.2倍。若下一級有多條分支線,則取各分支路低壓斷路器中大整定值的1.2倍。
10.5 低壓斷路器
(4)長延時(shí)過電流脫扣器整定電流
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