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1、全壓直接啟動
在電網(wǎng)容量和負(fù)載兩方面都允許全壓直接啟動的情況下,可以考慮采用全壓直接啟動。
優(yōu)點是操縱控制方便,維護(hù)簡單,而且比較經(jīng)濟(jì)。主要用于小功率電動機(jī)的啟動,從節(jié)約電能的角度考慮,大于11kW 的電動機(jī)不宜用此方法。
2、自耦減壓啟動
利用自耦變壓器的多抽頭減壓,既能適應(yīng)不同負(fù)載啟動的需要,又能得到更大的啟動轉(zhuǎn)矩,是一種經(jīng)常被用來啟動較大容量電動機(jī)的減壓啟動方式。
它的優(yōu)點是啟動轉(zhuǎn)矩較大,當(dāng)其繞組抽頭在80%處時,啟動轉(zhuǎn)矩可達(dá)直接啟動時的64%。并且可以通過抽頭調(diào)節(jié)啟動轉(zhuǎn)矩。至今仍被廣泛應(yīng)用。
3、Y-Δ啟動
對于正常運行的定子繞組為三角形接法的鼠籠式異步電動機(jī)來說,如果在啟動時將定子繞組接成星形,待啟動完畢后再接成三角形,就可以降低啟動電流,減輕它對電網(wǎng)的沖擊。這樣的啟動方式稱為星三角減壓啟動,或簡稱為星三角啟動(Y-Δ 啟動)。
采用星三角啟動時,啟動電流只是原來按三角形接法直接啟動時的1/3。如果直接啟動時的啟動電流以6~7Ie 計,則在星三角啟動時,啟動電流才2~2.3 倍。這就是說采用星三角啟動時,啟動轉(zhuǎn)矩也降為原來按三角形接法直接啟動時的1/3。
適用于無載或者輕載啟動的場合。并且同任何別的減壓啟動器相比較,其結(jié)構(gòu)最簡單,價格也。除此之外,星三角啟動方式還有一個優(yōu)點,即當(dāng)負(fù)載較輕時,可以讓電動機(jī)在星形接法下運行。此時,額定轉(zhuǎn)矩與負(fù)載可以匹配,這樣能使電動機(jī)的效率有所提高,并因之節(jié)約了電力消耗。
4、軟啟動器
這是利用了可控硅的移相調(diào)壓原理來實現(xiàn)電動機(jī)的調(diào)壓啟動,主要用于電動機(jī)的啟動控制,啟動效果好但成本較高。因使用了可控硅元件,可控硅工作時諧波干擾較大,對電網(wǎng)有一定的影響。
另外,電網(wǎng)的波動也會影響可控硅元件的導(dǎo)通,特別是同一電網(wǎng)中有多臺可控硅設(shè)備時。因此可控硅元件的故障率較高,因為涉及到電力電子技術(shù),因此對維護(hù)技術(shù)人員的要求也較高。
5、變頻器
變頻器是現(xiàn)代電動機(jī)控制領(lǐng)域技術(shù)含量,控制功能最全、控制效果的電機(jī)控制裝置,它通過改變電網(wǎng)的頻率來調(diào)節(jié)電動機(jī)的轉(zhuǎn)速和轉(zhuǎn)矩。因為涉及到電力電子技術(shù),微機(jī)技術(shù),因此成本高,對維護(hù)技術(shù)人員的要求也高,因此主要用在需要調(diào)速并且對速度控制要求高的領(lǐng)域。
減壓啟動、軟啟動、變頻啟動的優(yōu)缺點對比
減壓啟動,常見的是星-三角啟動,缺點是啟動力矩小,僅適用于無載或輕載啟動。優(yōu)點是價格便宜。
軟啟動,可以設(shè)置啟動時間和啟動初始力矩對設(shè)備實現(xiàn)軟啟動與軟停止,并能限制啟動電流,價格適中。
變頻啟動,能根據(jù)設(shè)定時間平滑啟動,并讓設(shè)備運行在設(shè)定頻率,價格較高。
減壓啟動、軟啟動、變頻啟動性能原理對比
1、軟啟動器是晶閘管交流調(diào)壓技術(shù)與功率因數(shù)控制技術(shù)的結(jié)合,是通過晶閘管調(diào)壓實現(xiàn)電機(jī)軟啟動、軟停車,不具備調(diào)速功能。
2、變頻器是利用電力半導(dǎo)體器件的通斷作用將工頻電源變換為另一頻率的電機(jī)控制(調(diào)速)裝置。通過變頻控制電機(jī)運行(電壓也隨頻率變化,如v/f恒定),是真正的高效調(diào)速方式,效率很高。變頻器能夠?qū)崿F(xiàn)真正的軟啟動、軟停止和高效調(diào)速。
3、減壓啟動一般常見的方式是自耦減壓起動和Y-Δ 起動兩種,自耦減壓起動它的優(yōu)點是啟動轉(zhuǎn)矩較大,當(dāng)其繞組抽頭在80%處時,起動轉(zhuǎn)矩可達(dá)直接啟動時的64%。并且可以通過抽頭調(diào)節(jié)啟動轉(zhuǎn)矩。至今仍被廣泛應(yīng)用。
Y-Δ適用于無載或者輕載啟動的場合。并且同任何別的減壓啟動器相比較,其結(jié)構(gòu)最簡單,價格也。除此之外,星三角啟動方式還有一個優(yōu)點,即當(dāng)負(fù)載較輕時,可以讓電動機(jī)在星形接法下運行。此時,額定轉(zhuǎn)矩與負(fù)載可以匹配,這樣能使電動機(jī)的效率有所提高,并因之節(jié)約了電力消耗。
減壓啟動、軟啟動、變頻啟動綜合分析
1、價格問題
自然是變頻器最貴,Y-Δ、自耦減壓啟動相對便宜。對于投入較小的項目,經(jīng)濟(jì)性就會成為。
2、可控問題
Y-Δ、自耦減壓啟動簡單,但僅僅只是啟動。但在自動化程度高的場合,估計就會使用得較少,甚至軟啟也少。而通過變頻器調(diào)控電機(jī),包括轉(zhuǎn)速、電壓等就遠(yuǎn)不是減壓啟動、軟啟動所能比擬的。所以變頻器在大型或自動化程度高的生產(chǎn)線就是了。
3、組網(wǎng)通訊
變頻器本身可以通過自身集成的或擴(kuò)展的通訊口實現(xiàn)網(wǎng)絡(luò)監(jiān)控。軟啟還能做一些監(jiān)控,但要實現(xiàn)電機(jī)的實時監(jiān)控,也是減壓啟動、軟啟動所不能比擬的。
4、維護(hù)方面
由于Y-Δ、自耦減壓啟動本身就比較簡單,自然維護(hù)起來也最簡單。我其實很反對使用軟啟,如果不選擇變頻器,肯定會直接選擇Y-Δ或自耦減壓啟動。
變頻器能完成實現(xiàn)電機(jī)的軟啟軟停,所以在相對負(fù)載較大的場合,Y-Δ、自耦減壓啟動或軟啟動都比不上變頻器。
補(bǔ)充知識對比
1.軟啟動器和變頻器
變頻器和軟啟動設(shè)備都屬于降壓啟動范疇,變頻器雖然降頻后大部分會降壓,但是,恒轉(zhuǎn)矩是全壓。
軟啟動是通過改變晶閘管的導(dǎo)通角來達(dá)到由電壓0到全電壓的啟動過程。
變頻器是全程控制,而且可以由儀表信號來控制任何時段的電機(jī)轉(zhuǎn)速,軟啟動器只能在電機(jī)啟動和停止時起到降壓的目的。
2.電機(jī)啟動方式大類比
電動機(jī)啟動常用方法:全壓直接啟動、自耦減壓啟動、Y-Δ啟動、軟啟動、變頻啟動等。
在電網(wǎng)和負(fù)載兩方面都允許的情況下,電動機(jī)以直接啟動為宜,因為操縱控制方便,而且比較經(jīng)濟(jì)。
自耦減壓啟動經(jīng)常被用來啟動較大容量鼠籠式異步電動機(jī),雖然自耦減壓啟動是一種老式的起動設(shè)備,但利用自耦變壓器的多抽頭減壓,既能適應(yīng)多種負(fù)載起動的需要,又能得到更大的啟動轉(zhuǎn)矩,加之還因裝設(shè)有熱繼電器和低電壓脫扣器而具有完善的過載和失壓保護(hù)而被廣泛應(yīng)用。
星三角啟動方式電流特性很好,而轉(zhuǎn)矩特性差,故只適應(yīng)于無載或輕載啟動的場合,但這種方式結(jié)構(gòu)最簡單,價格,在輕載運行中可以節(jié)約電力消耗。
以上這些啟動方式都屬于有級減壓啟動,存在明顯缺點,即啟動過程中出現(xiàn)二次沖擊電流。
3.軟啟動與傳統(tǒng)減壓啟動方式對比
①無沖擊電流
軟啟動器在啟動電機(jī)時,通過逐漸增大晶閘管導(dǎo)通角,使電機(jī)啟動電流從零線性上升至設(shè)定值。對電機(jī)無沖擊,提高了供電可靠性,平穩(wěn)啟動,減少對負(fù)載機(jī)械的沖擊轉(zhuǎn)矩,延長機(jī)器使用壽命。
②有軟停車功能
即平滑減速,逐漸停機(jī),它可以克服瞬間斷電停機(jī)的弊病,減輕對重載機(jī)械的沖擊,避免高程供水系統(tǒng)的水錘效應(yīng),減少設(shè)備損壞。
③啟動參數(shù)可調(diào)
根據(jù)負(fù)載情況及電網(wǎng)繼電保護(hù)特性選擇,可自由地?zé)o級調(diào)整至的啟動電流。
軟啟動器和變頻器是兩種完全不同用途的產(chǎn)品,變頻器是用于需要調(diào)速的地方,其輸出不但改變電壓而且同時改變頻率;軟啟動器實際上是個調(diào)壓器,用于電機(jī)啟動時,輸出只改變電壓并沒有改變頻率。
變頻器具備所有軟啟動器功能,但它的價格比軟啟動器貴得多,結(jié)構(gòu)也復(fù)雜得多。