MVI56-ADM MVI56-ADM MVI56-ADM MVI56-ADM MVI56-ADM MVI56-ADM MVI56-ADM
一、電壓速斷保護(hù)
線路發(fā)生短路故障時(shí)，母線電壓急劇下降，在電壓下降到電壓保護(hù)整定值時(shí)，低電壓繼電器動(dòng)作，跳開(kāi)斷路器，瞬時(shí)切除故障。這就是電壓速斷保護(hù)。
二、電流速斷保護(hù)
電流速斷保護(hù)分為無(wú)時(shí)限電流速斷和帶時(shí)限電流速斷，當(dāng)線路出現(xiàn)故障時(shí)，無(wú)時(shí)限速斷保護(hù)能瞬時(shí)動(dòng)作，但它只能線路的一部分，帶時(shí)限電流速斷保護(hù)能保護(hù)全線路另外帶時(shí)限速斷保護(hù)比下一級(jí)線路無(wú)時(shí)限保護(hù)大了一個(gè)時(shí)限差，因此下一段線路首端發(fā)生短路時(shí)，保護(hù)不會(huì)誤動(dòng)。
三、變壓器差動(dòng)速斷保護(hù)
差動(dòng)保護(hù)是變壓器的主保護(hù)，是按循環(huán)電流原理裝設(shè)的。
主要用來(lái)保護(hù)雙繞組或三繞組變壓器繞組內(nèi)部及其引出線上發(fā)生的各種相間短路故障，同時(shí)也可以用來(lái)保護(hù)變壓器單相匝間短路故障。
差動(dòng)速斷保護(hù) ，為了防止在較高短路電流水平時(shí),由于電流互感器飽和時(shí)產(chǎn)生的高次諧波量增加,產(chǎn)生極大的制動(dòng)力矩而使差動(dòng)保護(hù)拒動(dòng);當(dāng)短路電流達(dá)到4-10倍額定電流時(shí),速斷元件快速出口
差動(dòng)保護(hù)的性能非常好，可以瞬時(shí)切除全線范圍的故障，一般只用于元件保護(hù)，如變壓器和發(fā)電機(jī)等。其原理是比較元件兩側(cè)的電流大小和方向。
電流速斷保護(hù)反映相間短路故障，在10~35KV配電線路和小容量變壓器上應(yīng)用廣泛。其動(dòng)作電流按短路電流整定，數(shù)值大，只有線路始端故障時(shí)的短路電流才會(huì)大于其動(dòng)作電流，即速斷保護(hù)才會(huì)動(dòng)作，所以其保護(hù)范圍只限于線路前一部分。
限時(shí)速斷的功能:
MGK31C重合器控制器是專為中壓35kV及以下ZW□永磁開(kāi)關(guān)設(shè)計(jì)的戶外型控制器。能方便的配合柱上永磁開(kāi)關(guān)實(shí)現(xiàn)分、合閘管理...線路保護(hù)功能 ¨ 過(guò)流Ⅰ段:速斷保護(hù)功能 ¨ 過(guò)流Ⅱ段:限時(shí)速斷保護(hù) ¨ 過(guò)流Ⅲ段:定時(shí)限過(guò)流保護(hù) ¨ 自動(dòng)重合
過(guò)電流保護(hù)功能：
過(guò)繼電器電流保護(hù)器具有過(guò)載,堵轉(zhuǎn),過(guò)壓,欠壓,斷相,電流不平衡的保護(hù)功能,過(guò)電流保護(hù)器能對(duì)任何類型三相電動(dòng)機(jī)起快速,可靠的保護(hù).過(guò)電流保護(hù)器具有結(jié)構(gòu)簡(jiǎn)單,使用方便,價(jià)格低廉,而且無(wú)功耗,壽命長(zhǎng),體積小的特點(diǎn).
斷路器一般由觸頭系統(tǒng)、滅弧系統(tǒng)、操作機(jī)構(gòu)、脫扣器、外殼等構(gòu)成。
當(dāng)短路時(shí)，大電流（一般10至12倍）產(chǎn)生的磁場(chǎng)克服反力彈簧， 脫扣器拉動(dòng)操作機(jī)構(gòu)動(dòng)作，開(kāi)關(guān)瞬時(shí)跳閘。當(dāng)過(guò)載時(shí)，電流變大，發(fā)熱量加劇，雙金屬片變形到一定程度推動(dòng)機(jī)構(gòu)動(dòng)作（電流越大，動(dòng)作時(shí)間越短）。
現(xiàn)在有電子型的，使用互感器采集各相電流大小，與設(shè)定值比較，當(dāng)電流異常時(shí)微處理器發(fā)出信號(hào)，使電子脫扣器帶動(dòng)操作機(jī)構(gòu)動(dòng)作。
斷路器的作用是切斷和接通負(fù)荷電路，以及切斷故障電路，防止事故擴(kuò)大，保證安全運(yùn)行。而高壓斷路器要開(kāi)斷1500V，電流為1500-2000A的電弧，這些電弧可拉長(zhǎng)至2m仍然繼續(xù)燃燒不熄滅。故滅弧是高壓斷路器必須解決的問(wèn)題。
吹弧熄弧的原理主要是冷卻電弧減弱熱游離，另一方面通過(guò)吹弧拉長(zhǎng)電弧加強(qiáng)帶電粒子的復(fù)合和擴(kuò)散，同時(shí)把弧隙中的帶電粒子吹散，迅速恢復(fù)介質(zhì)的絕緣強(qiáng)度。
低壓斷路器也稱為自動(dòng)空氣開(kāi)關(guān)，可用來(lái)接通和分?jǐn)嘭?fù)載電路，也可用來(lái)控制不頻繁起動(dòng)的電動(dòng)機(jī)。它功能相當(dāng)于閘刀開(kāi)關(guān)、過(guò)電流繼電器、失壓繼電器、熱繼電器及漏電保護(hù)器等電器部分或全部的功能總和，是低壓配電網(wǎng)中一種重要的保護(hù)電器。
低壓斷路器具有多種保護(hù)功能（過(guò)載、短路、欠電壓保護(hù)等）、動(dòng)作值可調(diào)、 分?jǐn)嗄芰Ω摺⒉僮鞣奖?、安全等?yōu)點(diǎn)，所以目前被廣泛應(yīng)用。結(jié)構(gòu)和工作原理低壓斷路器由操作機(jī)構(gòu)、觸點(diǎn)、保護(hù)裝置（各種脫扣器）、滅弧系統(tǒng)等組成。
低壓斷路器的主觸點(diǎn)是靠手動(dòng)操作或電動(dòng)合閘的。主觸點(diǎn)閉合后，自由脫扣機(jī)構(gòu)將主觸點(diǎn)鎖在合閘位置上。過(guò)電流脫扣器的線圈和熱脫扣器的熱元件與主電路串聯(lián)，欠電壓脫扣器的線圈和電源并聯(lián)。當(dāng)電路發(fā)生短路或嚴(yán)重過(guò)載時(shí)，過(guò)電流脫扣器的銜鐵吸合，使自由脫扣機(jī)構(gòu)動(dòng)作，主觸點(diǎn)斷開(kāi)主電路。當(dāng)電路過(guò)載時(shí)，熱脫扣器的熱元件發(fā)熱使雙金屬片上彎曲，推動(dòng)自由脫扣機(jī)構(gòu)動(dòng)作。當(dāng)電路欠電壓時(shí)，欠電壓脫扣器的銜鐵釋放。也使自由脫扣機(jī)構(gòu)動(dòng)作。分勵(lì)脫扣器則作為遠(yuǎn)距離控制用，在正常工作時(shí)，其線圈是斷電的，在需要距離控制時(shí)，按下起動(dòng)按鈕，使線圈通電，銜鐵帶動(dòng)自由脫扣機(jī)構(gòu)動(dòng)作，使主觸點(diǎn)斷開(kāi)。
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Marconi Aviation Inventor Radio French Print 1937
1902 Colliers Apr 19 - Marconi's Own Story of Wireless
` MARCONI 1914 Original Historic Silent Film Lobby Card Piccola Mama
Marconi by Calvin D. Trowbridge Jr. (2010, Paperback) SIGNED BOOK
ex-RAF Vintage Marconi Radar Systems 440v 3 Phase Monitor - refurb
MADDELENA MARCONI Pink Velvet Multicolor Striped Flap Closure Shoulder Handbag
GILBARCO MARCONI PA01570061 CASH DRAWER w/ Cash/Coin Tray Insert
Marconi IFR 3U Slide Rack Mounting Full Kit gray NOS
1960 Los Angeles Rams Pocket Schedule Team Picture Marconi Arnett Pardee
MARCONI 800350/2 PSCU/28 CARD
Marconi/Positron OSIRIS PSCU/28 800350/2 SNCDKN03AA
Marconi - Branly Coherer Spark Radio Detector Tube Replica
Vintage RCA Radiola Radios 1919-29 w Marconi Victor Etc
KT67D MARCONI VALVE TUBE 1PC
NESTOR MARCONI CUARTETO QUINTETO SEPTIMINO tango ARGENTINA LP
PREMIATA FORNERIA MARCONI CHOCOLATE KINGS ARGENTINA LP
6 Antique marconi Edison light bulbs 30 Watt 120-240V
Edison vintage style light bulbs pack of 6 at 60 watt lamp bulb Marconi
Six Perma-Lite 30 Watt 130V nostalgic Style marconi Light Bulb
Six Edison 30 Watt 130V Antique Style marconi Light Bulb
NEW GILBARCO MARCONI M01580A001 ADVANTAGE LCD BACKLIGHT BOARD
GILBARCO MARCONI VERIFONE W01510-G1R DUAL FRONT DISPLAY BOARD CORE
GILBARCO MARCONI T16226-G1 DISPLAY BOARD CORE NO BOX
NEW GILBARCO MARCONI K93355-02 FIRMWARE INSTALLATION KIT CHIP
NM-4/155MMSCD Marconi 4port OC3 MMF SC D TNX ASX FORE
1 Year Warranty + Government & Corp. PO's Accepted
GILBARCO MARCONI VERIFONE T19547-G1 DISTRIBUTION BOARD CORE
GILBARCO MARCONI VERIFONE T15849-G2 INTERFACE BOARD CORE
NEW GILBARCO MARCONI M01580A001 ADVANTAGE LCD BACKLIGHT BOARD
NEW GILBARCO MARCONI T-17772-G4 T17772-G-4 BACKLIGHT POWER SUPPLY
NEW GILBARCO MARCONI K94439-01 KEYTOP KEY TOP KIT
NEW GILBARCO MARCONI K94439-02 KEYTOP KEY TOP KIT
GILBARCO MARCONI VERIFONE TM-930 M32SA RECEIPT PRINTER CORE
*ROYAL MINT 2001 SILVER PROOF MARCONI ￡2 POUND COIN*
MARCONI 131-8773/01 INTERFACE MOD FOR 16x2 MBIT RX
MILITARY MARCONI RADIO HEADSET EARLY TYPE WITH BOOM MIC
Marconi PCA-200 OC3SC 155MBPS Multimode Fibre Adapter Fore Systems
NIB 'O'AND'O27' GAUGE ROLLING STOCK GUGLIELMO MARCONI
RADIO MARCONI Science & Industry SPLENDID LARGE MEDAL !
Six L2780 MARCONI ANTIQUE-STYLE PERMA-GLOW LAMP LIGHT BULB
THE RISE OF RADIO, FROM MARCONI THROUGH THE GOLDEN - ALFRED BALK (PAPERBACK) NEW
Lula cortes,Marconi Notaro & Ze Ramalho-No Sub Reino Dos Metazoàrios-NEW LP
GILBARCO MARCONI M00059A001 CIRCUIT BOARD CORE
Six Perma-Lite 60 Watt 130V nostalgic Style marconi Light Bulb
1-Marconi-Jan-6V6G -D-getter. very strong .Made in Canada
NEW GILBARCO MARCONI R15474-354 SUPER PREMIUM UNLEADED SIGN
NEW GILBARCO MARCONI R15474-353 MID GRADE UNLEADED SIGN
NEW GILBARCO MARCONI R15474-352 REGULAR UNLEADED SIGN
MADAGASCAR 150TH ANNIVERSARY ITALY UNIFICATION GARIBALDI MARCONI S/S IMPERF
Silver proof 2001 ￡2 Marconi Wireless Bridges Atlantic
2001 MARCONI WIRELESS SILVER PROOF ￡2 COIN
PFM PREMIATA FORNERIA MARCONI CHOCOLATE KINGS JAPAN MINI LP HQ 2 CD
2001 MARCONI WIRELESS SILVER PROOF ￡2 COIN
, P.F.M.(PREMIATA FORNERIA MARCONI): PASSPARTU
2001 MARCONI WIRELESS SILVER PROOF ￡2 COIN
NESTOR MARCONI UN BANDONEON DE BUENOS AIRES ARGENTIN LP
NEW GILBARCO MARCONI T-14591-G1R DRIVER BOARD G-1-R
NEW GILBARCO MARCONI VERIFONE CC-235 Q12654-04 REGISTER TAPE 2 PLY 50 ROLL
GILBARCO MARCONI W01510-G4 DISPLAY BOARD CORE
GILBARCO MARCONI T15841-G3R CIRCUIT BOARD CORE
GILBARCO MARCONI T15077-G1 INTERFACE BOARD CORE
GILBARCO MARCONI PINPAD PIN PAD 1000SE P003-170-02-001 KEY CORE
GILBARCO MARCONI T17339-G1 DISPLAY BOARD CORE
NEW GILBARCO MARCONI K93666-01 SOFTWARE CHIP
NEW GILBARCO MARCONI T-19495-G1R MEMORY BOARD G-1-R
NEW GILBARCO MARCONI Q12404-01 3 1/2" Floppy Drive
NEW GILBARCO MARCONI T-13743-G1R Two Wire PWB Assembly G-1-R
NEW GILBARCO MARCONI T-13743-G2R Two Wire PWB Assembly G-2-R
NEW GILBARCO MARCONI T-16020-G2 CONNECTOR BOARD G-2
NEW GILBARCO MARCONI T-19077-G1 INTERFACE CIRCUIT BOARD G-1
NEW GILBARCO MARCONI T-19346-G1R STRIP BOARD G-1-R
GILBARCO MARCONI ROTARY FJ7490 EQUALIZER CABLE 298011
GILBARCO MARCONI T17772-G4 POWER SUPPLY CORE
PREMIATA FORNERIA MARCONI: The Award-winning Marconi Ba
NEW GILBARCO MARCONI T12679-G1R T-12679-G1R DISTRIBUTION BOARD
NEW GILBARCO MARCONI T12679-G1S T-12679-G1S DISTRIBUTION BOARD
NEW GILBARCO MARCONI T14594-G1R T-14594-G1R DRIVER BOARD
NEW GILBARCO MARCONI T-19550-G2R T19550-G2R CIRCUIT BOARD
NM-4/155MMSCC Marconi 4port OC3 MMF SC TNX ASX
1 Year Warranty + Government & Corp. PO's Accepted
1913 Scientific American November 1-Marconi,Tesla;Wrigh
FORE SYSTEMS MARCONI ASX-200BX ENTERPRISE ATM SWITCH
Marconi TM9650 Probe
GILBARCO MARCONI VERIFONE T20379-G4R DISPLAY BOARD CORE
GILBARCO MARCONI VERIFONE TMS-78 POWER SUPPLY CORE
NEW GILBARCO MARCONI GASBOY C05372 CO5372 CPU CIRCUIT BOARD
NEW GILBARCO MARCONI M00143B001 KEYPAD MONOCHROME SOFTKEY
Genalex GEC 6X4WA CV4001 EZ90 CV4005 Black Plate SQ Gett 1958 Marconi Osram RARE
Prem-Grade Long Life 6X4/CV493/6063/U78/ Plug&Play NOS
NEW GILBARCO MARCONI SORRY OUT OF ORDER BOOT GAS PUMP STATION FUEL
Marconi Instruments tft Power Meter System 6460S
GILBARCO MARCONI VERIFONE TM-930 M32SA RECEIPT PRINTER CORE #8
GILBARCO MARCONI VERIFONE T19547-G1 DISTRIBUTION BOARD CORE NO BOX
Marconi 2380 Display Section (for Spectrum Analyzer)
NEW GILBARCO MARCONI K93744-02 SOFTWARE CHIP
Marconi 2383 Spectrum Analyzer (100Hz-4.2GHz) No display section
1x 5Y4G 110E/149 MARCONI NOS CANADA Tube Röhre Lampe TSF Valvola Valvula
Marconi 2957A Option 20 Analog Cellular Adapter
R92262 Marconi Instruments Signal Generator TF-801B England
2x W729 MARCONI Tube Röhre Lampe TSF Valvola NOS
Maddalena Marconi Purse
EGYPT - ITALY 1930 MARCONI RADIO TELEGRAPH CO. TELEGRAM RECORD BOOK
Fore Systems Marconi 4-Port Module NM-4/155MMSCC
Stupid Set Marconi Connection Rangoon Patrol Heart Of State LP Nine Circles
Premiata Forneria Marconi L'ISOLA DI NIENTE Gold CD
VINTAGE MARCONI RF WATTMETER #ME 5005/U-Made in England
MARCONI 131-9468/01 , SWITCH POWER SUPPLY
2x 6627/0B2WA/OB2WA MARCONI NOS Tube Röhre Valvola Lampe TSF Valvula
Blue White Stripe MARCONI Men Sport Coat Blazer Jacket Sz 42 R
Marconi 20 Port 10/100 Base-T Module for ESR-5000 Switch NOB 218-0101-000
Marconi 219-0021-000 ESR-6000 Switch Element/Controller
1936 Colliers February 15-Marconi wireless; Malta;Jones
Marconi SCU131 DISC*S BRI ISDN CU 41008131
Marconi 218-0101-000 20-Port 10/100 Base-T Module
NEW GILBARCO MARCONI T12329-G1R T-12329-G1R SERVICE DATA CONTROL MODULE BOARD
4033-07-02P Marconi Microwave division
EZ90 U78 6X4 MARCONI SQ GETTER NOS VALVE TUBE 1PC C
1972 QE2 BBC & BROADCASTING HISTORY OFFICIAL FDC MARCONI PHILATELIC SOC LOVELY
MARCONI 1HAM60658AAD 1.2 POWER LTU SMA-1
MARCONI 1HAM60643AAC PASS THROUGH BOARD
GILBARCO MARCONI VERIFONE T20379-G4 DISPLAY BOARD CORE
GILBARCO MARCONI T19301-G1 CIRCUIT BOARD CORE
GILBARCO MARCONI T14781-G1R RELAY BOARD CORE
FORE MARCONI SCP-ASXHA-32 SWITCH CONTROL PROCESSOR ATM
NEW GILBARCO MARCONI K93845-01 SOFTWARE CHIP
NEW GILBARCO MARCONI T18464-G2 ASSEMBLY COVER PLATE
NEW GILBARCO MARCONI K35213 VALVE STRAINER
NEW GILBARCO MARCONI Q12893-06
FORE MARCONI NM-4/155MMSCC 4 PORT OC3 MMF SC TNX ASX
GILBARCO MARCONI VERIFONE 329923-001 TYPE B INTERFACE CIRCUIT BOARD CORE
NEW GILBARCO MARCONI U238-075-7144 S00435 POWER SUPPLY
1974 PREMIATA FORNERIA MARCONI PFM THE WORLD BECAME DIE CUT COVER ORIGINAL UK LP
MARCONI FORE NM-4/155MMSCD OC-3 MODULE MMF 4 PORT NEW
