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高壓固態(tài)軟啟動柜根據(jù)觸發(fā)電路與主回路的電氣聯(lián)系

來源:www.zszhongyue.com  |  發(fā)布時間:2025年07月30日
高壓固態(tài)軟啟動柜的一個難點在晶閘管的觸發(fā)上。高低壓開關柜廠家介紹高低壓開關柜由于主回路有多個晶閘管,每個晶閘管需要一塊觸發(fā)板來結束觸發(fā)。

觸發(fā)電路歸于控制電路,根據(jù)觸發(fā)電路與主回路的電氣聯(lián)系,觸發(fā)電路有兩種方法:


1、觸發(fā)電路與主回路隔絕。隔絕元器件有兩種:一種方法是選用光耦,但是光耦在注冊時和關斷時存在著死區(qū),高壓條件下,無論是發(fā)起或軟泊車,結束起來并不簡略。


并且由于單個光耦耐壓強度不高,有必要進行光耦的串聯(lián),但是各個光耦的不一起性會致使其在高壓條件下存在著被擊穿的危險。


盡管低壓軟啟動器選用這種方法非常便當有用,但在高壓條件下,仍是存在不少困難。一種方法是選用脈沖變壓器。這種方法比照老到可靠,在脈沖變壓器的原邊輸入脈沖,在次邊發(fā)作的脈沖波加在晶閘管的門極和陰極之間來結束觸發(fā)。觸發(fā)脈沖高電平和低電平的時間比也很首要,高電平時間長,對觸發(fā)板上的電源消耗大,高電平的時間短,不能充分注冊晶閘管。這種方法由于脈沖變壓器的功率束縛,在觸發(fā)超大功率晶閘管時存在著一定的困難。不過通過恰當?shù)靥幚砻}沖變壓器的原邊脈沖波,仍是可以結束的。


2、觸發(fā)電路與主回路有一個等電勢。這種方法避開了脈沖變壓器的功率束縛,但對觸發(fā)電路處理要求更高。


不論何種觸發(fā)電路,都懇求有一個觸發(fā)電源,這個電源給多塊觸發(fā)板供電。首先這個電源有必要非常安穩(wěn),其次這個電源可以自我調整,適應于各種功率的晶閘管的觸發(fā)。晶閘管充分觸發(fā)需要多少能量供應多少能量,既不多給,也不少給。多給會燒壞晶閘管,少給會開不通晶閘管。 

3、高壓固態(tài)軟起動器的工作環(huán)境簡略遭到各種電磁煩擾,因此觸發(fā)信號的傳遞有必要安全可靠。高壓軟起動器中,傳遞觸發(fā)信號,一般選用光纖傳輸,能有用地避免各種電磁煩擾。

通過光纖傳遞信號,也有兩種方法:一種多光纖方法,一種單光纖方法。

多光纖方法即每塊觸發(fā)板有一路光纖;單光纖方法即每一相只需一路光纖,信號傳遞到一塊主觸發(fā)板,再由主觸發(fā)板傳遞到同一相的其他觸發(fā)板。由于各路光纖光電傳輸進程中損耗不盡一致,因此從觸發(fā)一致性上看,單光纖的方法比多光纖可靠。

4、高壓固態(tài)軟發(fā)起器對信號的查看比低壓軟發(fā)起器要求更高。高壓軟起動器地點的環(huán)境存在著許多的電磁煩擾,并且高壓軟發(fā)起器所用的真空接觸器和真空斷路器在其分斷和閉合進程中會發(fā)作許多的電磁煩擾。所以對查看到的信號不只需進行硬件濾波,也要進行軟件濾波,去掉煩擾信號。


5、高壓固態(tài)軟發(fā)起器在結束發(fā)起進程后,要切換到旁路工作情況,怎樣滑潤地切換到工作情況,這也是軟發(fā)起器的一個難點,怎樣選準旁路點非常首要。旁路點早了,電流沖擊非常大,即便在低壓條件下,也會構成三相電源中斷路器跳閘,甚至會損壞斷路器。高壓條件下危害更大。旁路點遲了,電機抖動得兇狠,影響負載正常工作。因此,旁路信號的硬件查看電路有必要非常準,并且程序處理也要恰到好處。
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