描述
1756-CNBR
高壓電機一般功率較大,啟動時對電網(wǎng)的沖擊非常嚴重,直接啟動、串聯(lián)電抗器啟動、自藕變壓器降壓啟動、熱變電阻軟啟動、磁控軟啟動、變頻軟啟動是高壓電機常見的啟動方式,本文對這幾種啟動方式做簡單的介紹。
高壓電機直接啟動直接啟動就是在全電壓條件下直接啟動電機。如果電網(wǎng)條件允許,可以采用直接啟動。但在實際生產(chǎn)過程中往往由于電網(wǎng)容量有限,很少采用直接啟動。由于采用直接啟動時,啟動電流大,使電壓下降幅度較大,對于供電系統(tǒng)有較大的沖擊,如果壓降超過一定值,有可能導(dǎo)致上級變電所跳閘。故在實際運行中很少采用這種直接啟動方法。
高壓電機串聯(lián)電抗器啟動串聯(lián)電抗器啟動就是在電機啟動的時候串入電抗器,以限制和降低電機啟動時的啟動電流及電網(wǎng)壓降,當(dāng)電機運行穩(wěn)定且電流達到一定值時,切除電抗器變?yōu)殡姍C直接啟動模式。由于啟動過程中電機端的電壓也下降,容易導(dǎo)致啟動轉(zhuǎn)矩不夠,在啟動過程中還會出現(xiàn)一個二次沖擊的過程。
高壓電機自耦變壓器啟動自耦變壓器啟動是指電動機啟動時利用自耦變壓器來降低加在電動機定子繞組上的啟動電壓。待電動機啟動后,再使電動機與自耦變壓器脫離,從而在全壓下正常運行。優(yōu)點是可以按容許的啟動電流和所需的啟動轉(zhuǎn)矩來選擇自耦變壓器副邊的不同抽頭實現(xiàn)降壓啟動,而且不論電動機定子繞組采用星形接法或三角形接法都可以使用。缺點是設(shè)備的體積較大,因而成本較貴。
產(chǎn)品承諾:
保?證?全新原裝進口,
保?證?安全準時發(fā)貨,
保?證售后服務(wù)質(zhì)量,
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主營DCS系統(tǒng)配件
機器人系統(tǒng)配件
大型伺服系統(tǒng)配件
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