霍尼韋爾51304812-200好產(chǎn)品找億佳
高壓軟起動
社會發(fā)展是有階段性的。在不同階段，人們的生產(chǎn)手段、生產(chǎn)工具和生活用品都有很大的不同。上世紀80～90年代，的經(jīng)濟實力尚較薄弱，當(dāng)時的小水泥和小鋼鐵發(fā)展很快，1000kW～4000kW電機的應(yīng)用增長很快，與當(dāng)時的經(jīng)濟基礎(chǔ)相適應(yīng)的液態(tài)起動裝置出現(xiàn)，它經(jīng)濟實用，解決了電機起動中的一些問題。對當(dāng)時的經(jīng)濟發(fā)展起到了的作用。到世紀之交時期，經(jīng)濟實力已有較大的發(fā)展，生產(chǎn)手段和生產(chǎn)工具亦有了較大發(fā)展，電機容量也有了很大增長，人們開始不滿足液態(tài)起動裝置的低性能，于是晶閘管串聯(lián)式（固態(tài)）軟起動裝置的應(yīng)用開始增加，繼而又出現(xiàn)了開關(guān)變壓器式軟起動裝置和磁飽和電抗器式（磁控）起動裝置，變頻裝置用于電機軟起動的情況也越來越多，當(dāng)前這四種產(chǎn)品是大型電機起動市場的主品，液態(tài)起動裝置則應(yīng)用在小型（5000kW以下）電機上較多。另外，兩種老式起動方法（自耦變壓器和變壓器-電動機組）也常常出現(xiàn)在20000kW以下電機的起動上。
大型電機驅(qū)動的設(shè)備一般都是企業(yè)的核心設(shè)備，直接影響企業(yè)的生產(chǎn)狀況，因此人們應(yīng)該對其起動給予特別的關(guān)注，合理的選擇起動裝置將給企業(yè)帶來很大的經(jīng)濟效益。但是電機起動技術(shù)畢竟不是一個企業(yè)的核心技術(shù)，許多企業(yè)的電氣工作者很少有時間來研究起動方法之間的差別，往往會造成不恰當(dāng)?shù)倪x擇，有時甚至不得不做出第二次選擇，給企業(yè)造成不應(yīng)有的損失。因此，如實地說明起動方法的性能及其差別是非常重要的。為此我們在這方面做拋磚之嘗試，如有不完善和不妥之處，望不吝添金加玉。
引起電網(wǎng)電壓波動，影響同電網(wǎng)其它設(shè)備的運行
交流電動機在全壓直接起動時，起動電流會達到額定電流的4~7倍，當(dāng)電機的容量相對較大時，該起動電流會引起電網(wǎng)電壓的急劇下降，影響同電網(wǎng)其它設(shè)備的正常運行。
軟起動時，起動電流一般為額定電流的2~3倍，電網(wǎng)電壓波動率一般在10%以內(nèi)，對其它設(shè)備的影響非常小。
⒉對電網(wǎng)的影響
對電網(wǎng)的影響主要表現(xiàn)在兩個方面：
①超大型電機直接起動的大電流對電網(wǎng)的沖擊幾乎類似于三相短路對電網(wǎng)的沖擊，常常會引發(fā)功率振蕩，使電網(wǎng)失去穩(wěn)定。
②起動電流中含有大量的高次諧波，會與電網(wǎng)電路參數(shù)引起高頻諧振，造成繼電保護誤動作、自動控制失靈等故障。
軟起動時起動電流大幅度降低，以上影響可免除。

M9120-E 512 LPUF Matrox M9120 Plus Graphics Card 512 MB DDR2 ~ D ~
M9120-E512F Matrox M9120 Graphics Card 512 MB DDR2 ~ D ~
M9128-E1024LAF Matrox M9128 LP Graphics Card 1GB DDR2 ~ D ~
M9138-E1024LAF Matrox M9138 Graphics Card 1GB PCIe x16 Low Profile ~ D ~
M9140-E512LAF Matrox M9140 512MB GDDR2 PCI Express x16 (no cables)
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M9140-E512LAF Matrox M9140 Graphics Card 512 MB DDR2 ~ D ~
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m9188-e2048f m9188 graphic card - 2 gb - pci express x16 (open box)
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MATROX   MGI G4+MDHA16G DUALVGA AGP VIDEO CARD 906-01
MATROX  / PULSAR  586-03  REV  : B       / USED
matrox  644-03 copyright
matrox  7003-0301 REV A  video card vga  dvi 00P5758 G45FMDVP32DOE3D
Matrox  8MB G200 VIDEO CARD COMPAQ SP # 167033-001 356018002
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Matrox  CronosPlus Y7141_0001 REV.A
Matrox  DSXFX 7131-02-Rev-A
Matrox  DSXI0/1500 7134-03-Rev-A
MATROX - DUAL HEAD2GO DP EDITION
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Matrox  Pulsar 586-03 Board w/ Breakage
Matrox  RTX-100 Video Capture and Editing Board
MATROX  SOL2MEVCLB BOARD SOLIOS eV-CL Y7367-00 REV:B  WORKING FREE SHIP
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Matrox (1024 MB) (M9148) Graphics Card
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matrox /  METEOR2-CL/32   USED
Matrox / Brooks BM18251 PCB MTR CONT AUTOI/OD2
matrox / CronosPlus 7141_0001 REV_A  / Frame Grabber Card / USED
matrox / CronosPlus 7141_0001 REV_A / Frame Grabber Card / USED
Matrox / Hel2Mdbcl / 63039620649 M012150 60Days Warranty
Matrox / Met2-Dig/4/L50 / 752-03 / Met2 Dig 4 L50 / 752 03
matrox / METEOR2-CL/32 USED
MATROX / METEOR2-DIG/4/L  752-0202 REV.A / Board / USED
MATROX / METEOR2-DIG/4/L 752-0202 REV.A / Board / USED
Matrox / Mrvm/Vid / Mrvm Vid
MATROX / PULSAR 586-03 REV : B / USED
matrox / SOL6MCL  SOLIOS XCL  7184-01 REV.A / Board / USED
matrox / SOL6MCL SOLIOS XCL 7184-01 REV.A / Board / USED
matrox / Y7367-00  REV.B  SOL2MEVCLB* / Board  / USED
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Matrox 136-C06-3 PCB STD-2480 Board
Matrox 15124-00
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MATROX 158-D06-02 UNMP
MATROX 158-D06-05A / 158D0605A (USED TESTED CLEANED)
MATROX 158-D06-05A USED BW-ALPHA CIRCUIT BOARD 158D0605A
MATROX 158-D06-05B / 158D0605B (REPAIR EVALUATION ONLY)
Matrox 158-D06-05B 158D0605B Video Monitor Board Card
MATROX 158-D06-05B UNMP
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Matrox 15942-02 Quad DVI DMS-59 Cable 60pin 2x LFH60 4x 25pin DVI-D Dual Link
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Matrox 16029-02 Video Card Splitter Cable - Lot of 5
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