132-C09MATC10現(xiàn)貨

隨著計算機軟件、硬件、網(wǎng)絡(luò)技術(shù)的飛速發(fā)展以及發(fā)電機組單機容量的迅速增加，微機局域網(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［1，2］。江油發(fā)電廠7號、8號機組為進口法國ALSTHOM公司的330 MW火電機組，其控制設(shè)備Centrolog—T20系統(tǒng)為國外80年代產(chǎn)品，共采集模擬量700個、邏輯量3 000多個，是典型的大型分散控制和集中監(jiān)視系統(tǒng)。其下位機T20系統(tǒng)包括邏輯控制(Controlbloc)、鍋爐控制(Micro—z)、汽機控制(Micro—Rec)等下級控制和調(diào)節(jié)系統(tǒng)，它完成機組主輔機控制和調(diào)節(jié)以及電氣控制。上位機Centrolog系統(tǒng)是以1臺BULL公司的Solar小型機為中心，在RTES16實時操作系統(tǒng)支撐下構(gòu)成的多任務(wù)實時系統(tǒng)，對機組運行狀態(tài)和參數(shù)信息進行集中監(jiān)視。機組多年的運行表明：下位機T20系統(tǒng)具有很高的可靠性，其系統(tǒng)軟、硬件設(shè)計嚴密周到，充分考慮了特殊情況，留有充足的備用資源；上位機Centrolog系統(tǒng)的數(shù)據(jù)有較高的可靠性和準確性。由于機組取消了很多常規(guī)儀表，因而數(shù)據(jù)大多通過Centrolog系統(tǒng)進行監(jiān)測，它具有相當(dāng)?shù)膶嵱眯?，是不可缺少的重要設(shè)備。然而，Centrolog系統(tǒng)也存在一些問題，給發(fā)電機組的安全運行帶來了較大影響和隱患。基于此，省電力局組織科研力量于1996年開始對系統(tǒng)進行技術(shù)改造，利用現(xiàn)有的高性能微機取代原小型機，與微機網(wǎng)絡(luò)接軌。

能力用電流有效值（kA）表示。
3）斷路器額定運行短路分斷能力應(yīng)大于線路中大短路電流。
4）斷路器的額定短時耐受電流（0.5s、3s）應(yīng)大于線路中短時持續(xù)短路電流。
10.5 低壓斷路器
當(dāng)分斷能力不夠，一般的線路，可用有填料式熔斷器（RT0）來替代低壓斷路器。對于特別重要的供電線路，應(yīng)采用更大容量的低壓斷路器
10.5 低壓斷路器
（6）斷路器欠電壓脫扣器額定電壓等于線路額定電壓。
（7）直流快速斷路器需考慮過電流脫扣器的動作方向（極性）、短路電流上升率。
（8）剩余電流保護斷路器需選擇合理的剩余電流動作電流和剩余電流不動作電流。注意能否斷開短路電流，如不能斷開短路電流則需要適當(dāng)?shù)娜蹟嗥髋浜鲜褂谩?br /> （9）滅磁斷路器選擇時需考慮發(fā)電機的強勵電壓、勵磁線圈的時間常數(shù)、放電電阻及斷開強勵電流的能力。
10.1.1 斷路器的作用
高壓斷路器在正常運行時用它接通或切斷負荷電流；
在電氣設(shè)備或線路發(fā)生短路故障或嚴重過負荷時，由繼電保護裝置控制其自動迅速地切斷故障電流，切斷發(fā)生短路故障的設(shè)備或線路，以防止擴大事故范圍。
10.1.2 斷路器的功能
斷路器開斷電路時，充分利用交流電弧電流每半周過零一次自然熄弧的特點，加強去游離使電弧不再復(fù)燃。其介質(zhì)強度恢復(fù)主要由斷路器滅弧裝置和介質(zhì)特性所決定。
系統(tǒng)電壓恢復(fù)過程可能是周期性的或非同期性的。取決于被開斷電路的參數(shù)。

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132-C09MATC10

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