WL23-2P2430現(xiàn)貨

隨著計(jì)算機(jī)軟件、硬件、網(wǎng)絡(luò)技術(shù)的飛速發(fā)展以及發(fā)電機(jī)組單機(jī)容量的迅速增加，微機(jī)局域網(wǎng)絡(luò)的應(yīng)用已是電力監(jiān)控系統(tǒng)發(fā)展的必然趨勢(shì)［1，2］。江油發(fā)電廠7號(hào)、8號(hào)機(jī)組為進(jìn)口法國(guó)ALSTHOM公司的330 MW火電機(jī)組，其控制設(shè)備Centrolog—T20系統(tǒng)為國(guó)外80年代產(chǎn)品，共采集模擬量700個(gè)、邏輯量3 000多個(gè)，是典型的大型分散控制和集中監(jiān)視系統(tǒng)。其下位機(jī)T20系統(tǒng)包括邏輯控制(Controlbloc)、鍋爐控制(Micro—z)、汽機(jī)控制(Micro—Rec)等下級(jí)控制和調(diào)節(jié)系統(tǒng)，它完成機(jī)組主輔機(jī)控制和調(diào)節(jié)以及電氣控制。上位機(jī)Centrolog系統(tǒng)是以1臺(tái)BULL公司的Solar小型機(jī)為中心，在RTES16實(shí)時(shí)操作系統(tǒng)支撐下構(gòu)成的多任務(wù)實(shí)時(shí)系統(tǒng)，對(duì)機(jī)組運(yùn)行狀態(tài)和參數(shù)信息進(jìn)行集中監(jiān)視。機(jī)組多年的運(yùn)行表明：下位機(jī)T20系統(tǒng)具有很高的可靠性，其系統(tǒng)軟、硬件設(shè)計(jì)嚴(yán)密周到，充分考慮了特殊情況，留有充足的備用資源；上位機(jī)Centrolog系統(tǒng)的數(shù)據(jù)有較高的可靠性和準(zhǔn)確性。由于機(jī)組取消了很多常規(guī)儀表，因而數(shù)據(jù)大多通過(guò)Centrolog系統(tǒng)進(jìn)行監(jiān)測(cè)，它具有相當(dāng)?shù)膶?shí)用性，是不可缺少的重要設(shè)備。然而，Centrolog系統(tǒng)也存在一些問(wèn)題，給發(fā)電機(jī)組的安全運(yùn)行帶來(lái)了較大影響和隱患?；诖耍‰娏纸M織科研力量于1996年開始對(duì)系統(tǒng)進(jìn)行技術(shù)改造，利用現(xiàn)有的高性能微機(jī)取代原小型機(jī)，與微機(jī)網(wǎng)絡(luò)接軌。

頻器，另外在此種情況下，變頻器的控制方式只能為v/f控制方式，并且變頻器無(wú)法實(shí)現(xiàn)電動(dòng)機(jī)的過(guò)流、過(guò)載保護(hù)，此時(shí)，需在每臺(tái)電動(dòng)機(jī)側(cè)加熔斷器來(lái)實(shí)現(xiàn)保護(hù)。
3、對(duì)于一些特殊的應(yīng)用場(chǎng)合，如高環(huán)境溫度、高開關(guān)頻率、高海拔等，此時(shí)會(huì)引起變頻器的降容，變頻器需放大一擋選擇。
4、使用變頻器控制高速電動(dòng)機(jī)時(shí)，由于高速電動(dòng)機(jī)的電抗小，會(huì)產(chǎn)生較多的高次諧波。而這些高次諧波會(huì)使變頻器的輸出電流值增加。因此，選擇用于高速電動(dòng)機(jī)的變頻器時(shí)，應(yīng)比普通電動(dòng)機(jī)的變頻器稍大一些。
5、變頻器用于變極電動(dòng)機(jī)時(shí)，應(yīng)充分注意選擇變頻器的容量，使其大額定電流在變頻器的額定輸出電流以下。另外，在運(yùn)行中進(jìn)行極數(shù)轉(zhuǎn)換時(shí)，應(yīng)先停止電動(dòng)機(jī)工作，否則，會(huì)造成電動(dòng)機(jī)空轉(zhuǎn),惡劣時(shí)會(huì)造成變頻器損壞。
6、驅(qū)動(dòng)防爆電動(dòng)機(jī)時(shí)，變頻器沒(méi)有防爆構(gòu)造，應(yīng)將變頻器設(shè)置在危險(xiǎn)場(chǎng)所之外。
以上內(nèi)容便是西門子變頻器應(yīng)該怎樣選擇的條件以及選擇西門子變頻器應(yīng)該注意的問(wèn)題。提醒大家不管選擇哪款電力設(shè)備產(chǎn)品，符合自己要求的才是重要。

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WL23-2P2430

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WL23-2P2430

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