INIIL02-H介質(zhì)模塊
高壓軟起動(dòng)
社會(huì)發(fā)展是有階段性的。在不同階段，人們的生產(chǎn)手段、生產(chǎn)工具和生活用品都有很大的不同。上世紀(jì)80～90年代，的經(jīng)濟(jì)實(shí)力尚較薄弱，當(dāng)時(shí)的小水泥和小鋼鐵發(fā)展很快，1000kW～4000kW電機(jī)的應(yīng)用增長很快，與當(dāng)時(shí)的經(jīng)濟(jì)基礎(chǔ)相適應(yīng)的液態(tài)起動(dòng)裝置出現(xiàn)，它經(jīng)濟(jì)實(shí)用，解決了電機(jī)起動(dòng)中的一些問題。對(duì)當(dāng)時(shí)的經(jīng)濟(jì)發(fā)展起到了的作用。到世紀(jì)之交時(shí)期，經(jīng)濟(jì)實(shí)力已有較大的發(fā)展，生產(chǎn)手段和生產(chǎn)工具亦有了較大發(fā)展，電機(jī)容量也有了很大增長，人們開始不滿足液態(tài)起動(dòng)裝置的低性能，于是晶閘管串聯(lián)式（固態(tài)）軟起動(dòng)裝置的應(yīng)用開始增加，繼而又出現(xiàn)了開關(guān)變壓器式軟起動(dòng)裝置和磁飽和電抗器式（磁控）起動(dòng)裝置，變頻裝置用于電機(jī)軟起動(dòng)的情況也越來越多，當(dāng)前這四種產(chǎn)品是大型電機(jī)起動(dòng)市場的主品，液態(tài)起動(dòng)裝置則應(yīng)用在小型（5000kW以下）電機(jī)上較多。另外，兩種老式起動(dòng)方法（自耦變壓器和變壓器-電動(dòng)機(jī)組）也常常出現(xiàn)在20000kW以下電機(jī)的起動(dòng)上。
大型電機(jī)驅(qū)動(dòng)的設(shè)備一般都是企業(yè)的核心設(shè)備，直接影響企業(yè)的生產(chǎn)狀況，因此人們應(yīng)該對(duì)其起動(dòng)給予特別的關(guān)注，合理的選擇起動(dòng)裝置將給企業(yè)帶來很大的經(jīng)濟(jì)效益。但是電機(jī)起動(dòng)技術(shù)畢竟不是一個(gè)企業(yè)的核心技術(shù)，許多企業(yè)的電氣工作者很少有時(shí)間來研究起動(dòng)方法之間的差別，往往會(huì)造成不恰當(dāng)?shù)倪x擇，有時(shí)甚至不得不做出第二次選擇，給企業(yè)造成不應(yīng)有的損失。因此，如實(shí)地說明起動(dòng)方法的性能及其差別是非常重要的。為此我們?cè)谶@方面做拋磚之嘗試，如有不完善和不妥之處，望不吝添金加玉。
引起電網(wǎng)電壓波動(dòng)，影響同電網(wǎng)其它設(shè)備的運(yùn)行
交流電動(dòng)機(jī)在全壓直接起動(dòng)時(shí)，起動(dòng)電流會(huì)達(dá)到額定電流的4~7倍，當(dāng)電機(jī)的容量相對(duì)較大時(shí)，該起動(dòng)電流會(huì)引起電網(wǎng)電壓的急劇下降，影響同電網(wǎng)其它設(shè)備的正常運(yùn)行。
軟起動(dòng)時(shí)，起動(dòng)電流一般為額定電流的2~3倍，電網(wǎng)電壓波動(dòng)率一般在10%以內(nèi)，對(duì)其它設(shè)備的影響非常小。
⒉對(duì)電網(wǎng)的影響
對(duì)電網(wǎng)的影響主要表現(xiàn)在兩個(gè)方面：
①超大型電機(jī)直接起動(dòng)的大電流對(duì)電網(wǎng)的沖擊幾乎類似于三相短路對(duì)電網(wǎng)的沖擊，常常會(huì)引發(fā)功率振蕩，使電網(wǎng)失去穩(wěn)定。
②起動(dòng)電流中含有大量的高次諧波，會(huì)與電網(wǎng)電路參數(shù)引起高頻諧振，造成繼電保護(hù)誤動(dòng)作、自動(dòng)控制失靈等故障。
軟起動(dòng)時(shí)起動(dòng)電流大幅度降低，以上影響可免除。


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