福州聚福興自動化有限公司

PARKER ZETA4 87-014030-02A現(xiàn)貨

隨著計算機軟件、硬件、網(wǎng)絡技術(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)絡的應用已是電力監(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?shù)膶嵱眯?，是不可缺少的重要設備。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)絡接軌。

長延時過電流脫扣器整定電流應大于線路中計算電流
（4-10-9）
式中 ——過電流脫扣器的長延時動作整定電
流值，A；
——可靠系數(shù)，一般取1.1；
——線路的計算電流，單臺電動機是指
電動機的額定電流，A。
10.5 低壓斷路器
校驗一：長延時過電流脫扣器在配電線路過載時的可靠性。如對電動機進行保護，則電動機在過載 20％時應使保護裝置動作；
校驗二：在配電線路出現(xiàn)尖峰負荷時或在電動機起動時，長延時過電流脫扣器不誤動。脫扣器在3倍整定電流值下的可返回時間，取決于線路中尖峰電流的持續(xù)時間，也就是線路中大容量的異步電動機直接起動的持續(xù)時間。
一般情況下，電動機的輕載起動時間不超過2.5～4s，電動機滿載起動時間不超過6～8s，個別電動機重載起動時間達15s。返回時間越小，說明線路電流大于長延時脫扣器整定電流值的倍數(shù)越高，保護裝置的動作越快。
10.5 低壓斷路器
（5）分斷能力
1）斷路器額定短路分斷能力應大于線路中大短路電流。
2）斷路器的額定極限短路分斷能力應大于斷路器額定運行短路分斷能力（對于直流電流線路，兩者的數(shù)值相同）。分斷能力是指低壓斷路器在規(guī)定的試驗（如電壓、頻率、線路其它參數(shù)等）條件下，能夠接通成切斷短路電流的數(shù)值。分斷

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Ametek Vacuum Motor 118148-53 120V 50/60Hz (EC4-2)
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AMETEK PRESSURE GAUGES VACUUM V500 1/4"LM

PARKER ZETA4 87-014030-02A

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Accuray 7-084963-001 L1 Circuit Board #26455
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ACCURAY 3-082318-001 REV. G/H POWER SUPPLY ASSEMBLY SCANNER CONTROLLER 51973
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ACCURAY 083143-001 SCANNER POWER FAIL DETECTOR BOARD CARD 59019
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ABB AUTOMATION 086348-001 ECF ACCURAY PC CIRCUIT CONTROL BOARD CARD MODULE 59029
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ABB ACCURAY 8-061588-002 B INTERFACE INPUT/OUTPUT I/O CIRCUIT BOARD MODULE 56991
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PARKER ZETA4 87-014030-02A

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1 AMETEK ANSI-B40.1 PRESSURE GAUGE N2-3
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LOT OF 3 AMETEK GAUGES P77413 P575 *NEW*
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AMETEK USG GAUGE 155025X, SIZE: 4-1/2, 1/4 ANPT LM
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NEW - Lot of 3 - Ametek Temperature Gauge w/ Sensor
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New Ametek U.S. Gauge P-505A (163282) Low Cost Utility Gauge, 200psi. 1/4" NPTLM
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PARKER ZETA4 87-014030-02A

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