R431003072現(xiàn)貨
全國總代理施耐德,ABB,歐姆龍,西門子,三菱,魏得米勒,金鐘默勒,倍加福,三菱,安川,松下,韋肯,三墾,臺達(dá),日立,宏發(fā),圖爾克,巴魯夫,LG,CT,A-B,丹佛斯,海格等
主營業(yè)務(wù):一級代理銷售施耐德,ABB,歐姆龍,西門子,三菱,魏得米勒,金鐘默勒,倍加福,三菱,安川,松下,韋肯,三墾,臺達(dá),日立,宏發(fā),圖爾克,巴魯夫,LG,CT,A-B,丹佛斯,海格等品牌系列產(chǎn)品,歡迎來電咨詢。
福州聚福興自動化有限公司專業(yè)代理各品牌產(chǎn)品,以工業(yè)自動化為主營,集科,工,貿(mào)于一體的 全民科研開發(fā),技術(shù)改造,工程服務(wù)中心,常年備有大量庫存,是全國大的自動化公司之一。公司總部設(shè)在福州,在 全國各大城市都設(shè)有銷售服務(wù)網(wǎng)絡(luò)。目前,在全國各地基本上都有物流。我司常年不間斷的備有1億庫存。本著龐大的銷售服務(wù)網(wǎng)絡(luò),以及客戶至上的宗旨,為廣大新老用戶提供、高效的服務(wù)
首先,機(jī)器人產(chǎn)業(yè)發(fā)展頂層設(shè)計(jì)。從2014年至今,建設(shè)機(jī)器人產(chǎn)業(yè)園區(qū)的熱潮已經(jīng)遍及。一些地方為追逐經(jīng)濟(jì)增長,不考慮現(xiàn)實(shí)條件盲目進(jìn)行項(xiàng)目建設(shè),搶占機(jī)器人市場。由于具有的行政能力,可在短期內(nèi)各種資源,所以一旦方向錯誤將造成嚴(yán)重的高耗能、低效率,不僅浪費(fèi)了資源而且很有可能錯失了發(fā)展真正優(yōu)勢產(chǎn)業(yè)的機(jī)會。同時,還可能造成低水平的重復(fù)建設(shè),擾亂市場正常競爭和行業(yè)的健康發(fā)展。 其次,核心技術(shù)受制于人,產(chǎn)業(yè)集中在低端領(lǐng)域。機(jī)器人產(chǎn)業(yè)本應(yīng)是制造業(yè),但我國機(jī)器人產(chǎn)業(yè)仍然沒有只能參與到產(chǎn)業(yè)的低端領(lǐng)域進(jìn)行生產(chǎn)的怪圈。2016年年初,工業(yè)和信息化部對機(jī)器人產(chǎn)業(yè)情況進(jìn)行了摸底調(diào)查,初步統(tǒng)計(jì)涉及機(jī)器人生產(chǎn)及集成應(yīng)用的企業(yè)有800余家,其中200多家是機(jī)器人本體制造企業(yè),大部分企業(yè)以組裝和代加工為主,產(chǎn)品主要集中在三軸、四軸的中低端機(jī)器人。企業(yè)規(guī)模也普遍較小,逾90%的企業(yè)年產(chǎn)值在1億元幣以下,龍頭企業(yè)規(guī)模也不大,同機(jī)器人企業(yè)的營業(yè)收入相比差距較大,難以支撐產(chǎn)業(yè)未來規(guī)?;陌l(fā)展目標(biāo)。本土企業(yè)品牌機(jī)器人供給能力嚴(yán)重不足,本土市場機(jī)器人的外國品牌占到85%。究其原因在于,我國在機(jī)器人的三大核心零部件——伺服、減速器、控制器的研發(fā)上始終受制于人。
2.(2)把額定條件下的開斷能力稱為額定斷流容量。三相電路的額定斷流容量,以
(MVA)表示。
我國根據(jù)國際電工委員會(IEC)的規(guī)定,現(xiàn)只把額定開斷電流作為表征開斷能力的參數(shù),而斷流容量僅作為描述斷路器特性的一個數(shù)值。
3.關(guān)合能力
說明斷路器關(guān)合短路故障能力的參數(shù)為額定關(guān)合電流。其數(shù)值以關(guān)合操作時,瞬態(tài)電流個大半波峰值來表示,制造部門對關(guān)合電流一般取額定開斷電流的 倍即
(4-10-1)
式中 ——額定關(guān)合電流,kA;
——額定開斷電流,kA。
斷路器關(guān)合短路電流的能力除與滅弧裝置性能有關(guān)外,還與斷路器操動機(jī)構(gòu)的合閘功率的大小有關(guān)。
耐受性能
斷路器應(yīng)具有足夠的耐受短時短路電流作用的能力,簡稱耐受能力。
(1)短時熱電流(熱穩(wěn)定電流) 在規(guī)定的時間內(nèi)(規(guī)定標(biāo)準(zhǔn)時間為2s,需要大于2s時推薦4s)斷路器在合閘位置,可能經(jīng)受的短時熱電流有效值(kA),稱為短時熱電流(或短時耐受電流),斷路器標(biāo)準(zhǔn)中規(guī)定
(4-10-2)
短時熱電流通過斷路器時,各零部件的溫度不應(yīng)超過短時發(fā)熱高允許溫度,且不致出現(xiàn)觸頭熔接或軟化變形,以及其它妨礙正常運(yùn)行的異?,F(xiàn)象。允許發(fā)熱高溫度數(shù)值隨材料而異。
(2)峰值耐受電流 峰值耐受電流亦稱動穩(wěn)定電流,即在規(guī)定的使用條件和性能下,斷路器在合閘位置時所能經(jīng)受的電流峰值。它與關(guān)合電流不同的是,峰值耐受電流是斷路器處于合閘位置時通過的短路電流,而關(guān)合電流則是由于斷路器關(guān)合短路故障所產(chǎn)生的短路電流。峰值耐受電流也是以短路電流的個大半波峰值電流來表示,且
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