廈門泰尼電氣有限公司
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具體成交價以合同協(xié)議為準- 140XCP90000140XCP900 產(chǎn)品型號
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訪問次數(shù)：322更新時間：2017-02-27 13:55:09
140XCP90000
140XCP90000
在電動機控制接線中，主電路中裝有熔斷器，為什么還要加裝熱繼電器?它們各起何作用，能否互相代替?而在電熱及照明線路中，為什么只裝熔斷器而不裝熱繼電器?
答:熔斷器在電氣線路中主要起短路保護和嚴重過載保護作用，而熱繼電器主要用于過載保護.兩者不能互為代用，但可以互為補充.如果用熔斷器作電動機的過載保護，為了防止電動機在啟動過程中熔斷器熔斷，熔斷器熔體的額定電流一般應取電動機額定電流的2. 5~3倍，這樣即使電動機長時間過負荷50%，熔斷器也不會熔斷，而電動機可能因長時間過負荷而燒壞.所以不能用熔斷器作過負載保護.而熱繼電器是利用電流的熱效應來工作的，由于熱慣性的影響，盡管發(fā)生短路時電流很大，也不可能使熱繼電器立即動作，這樣就延長了短路故障的影響時間，對供電系統(tǒng)及用電設(shè)備會造成危害.所以也不能用熱繼電器作為短路保護.
對于電熱及照明設(shè)備，由于負載的性質(zhì)不同于電動機的拖動負載，一般來說，它們不會出現(xiàn)過負載現(xiàn)象，所以，一般不裝備熱繼電器，而只裝備熔斷器，主要起短路保護作用.接觸器的作用是什么？根據(jù)結(jié)構(gòu)特征如何區(qū)分交、直流接觸器？
接觸器的作用是控制電動機的啟停、正反轉(zhuǎn)、制動和調(diào)速等。
交流接觸器的鐵芯用硅鋼片疊鉚而成，而且它的激磁線圈設(shè)有骨架，使鐵芯與線圈隔離并將線圈制成短而厚的矮胖型，這樣有利于鐵芯和線圈的散熱。
直流接觸器的鐵芯通常使用整塊鋼材或工程純鐵制成，而且它的激磁線圈制成高而薄的瘦高型，且不設(shè)線圈骨架，使線圈與鐵芯直接接觸，易于散熱。
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Agilent G1946-65251 Tstd Octopole 2 Pca New
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