東營市BUMHAN電抗器BHSR-18H,BHSR-24H,BHSR-30H韓國Sinwoo S-CON變送器。中山立訊電氣有限公司,中山朗立電氣有限公司
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b、低電壓繼電器：0.5倍整定值的動(dòng)作時(shí)間不大于20m。返回系數(shù)a、過電壓繼電器返回系數(shù)為0.85~0.95；b、低電壓繼電器返回系數(shù)為1.02~1.12；返回時(shí)間：不大于27ms。3.靜態(tài)有源電壓繼電器靜態(tài)有源電壓繼電器用于發(fā)電機(jī)保護(hù)、變壓器保護(hù)和輸電線路保護(hù)裝置中，作為過電壓保護(hù)或低電壓閉鎖的啟動(dòng)元件。本繼電器為集成電路靜態(tài)型繼電器，精度高、功耗小、動(dòng)作時(shí)間短、返回系數(shù)高、整定直觀方便、范圍寬，且作為低電壓繼電器使用無抖動(dòng)現(xiàn)象。有輔源電壓繼電器，輔助電源采用開關(guān)電源變換，85-265V交直流通用，工作范圍大，從1-450V均能可靠工作。4.靜態(tài)無源電壓繼電器電壓繼電器用于發(fā)電機(jī)、變壓器和輸電線的繼電保護(hù)裝置中。
東營市BUMHAN電抗器BHSR-18H,BHSR-24H,BHSR-30H
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其周期決定于kf，振幅決定于ku,中曲線①，載波為雙極性的等腰三角波，其周期決定于載波頻率，振幅不變，與ku=1時(shí)正弦波的振幅值相等。調(diào)制波與載波的交點(diǎn)決定了逆變橋輸出相電壓的脈沖系列，此脈沖系列也是雙極性的，但是，由相電壓合成為線電壓(uab=ua-ub;ubc=ub-uc;uca=uc-ua)時(shí)，所得到的線電壓脈沖系列卻是單極性的。(2)雙極性調(diào)制的工作特點(diǎn)：逆變橋在工作時(shí)，同一橋臂的兩個(gè)逆變器件總是按相電壓脈沖系列的規(guī)律交替地導(dǎo)通和關(guān)斷，毫不停息，而流過負(fù)載ZL的是按線電壓規(guī)律變化的交變電流。實(shí)施SPWM的基本要求(1)必須實(shí)時(shí)地計(jì)算調(diào)制波(正弦波)和載波(三角波)的所有交點(diǎn)的時(shí)間坐標(biāo)。
東營市BUMHAN電抗器BHSR-18H,BHSR-24H,BHSR-30H
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DIV-4G4-W DIV-4G4-X DIV-4G4-Y DIV-4G4-Z一般為戶外型。氣體絕緣電流互感器：主絕緣由氣體構(gòu)成。按安裝方式分類貫穿式電流互感器[5]：用來穿過屏板或墻壁的電流互感器。支柱式電流互感器：安裝在平面或支柱上，兼做一次電路導(dǎo)體支柱用的電流互感器。套管式電流互感器：沒有一次導(dǎo)體和一次絕緣，直接套裝在絕緣的套管上的一種電流互感器。母線式電流互感器：沒有一次導(dǎo)體但有一次絕緣，直接套裝在母線上使用的一種電流互感器。按原理分類電磁式電流互感器：根據(jù)電磁感應(yīng)原理實(shí)現(xiàn)電流變換的電流互感器。電子式電流互感器[6]：例如（1）光學(xué)電流互感器是指采用光學(xué)器件作被測(cè)電流傳感器，光學(xué)器件由光學(xué)玻璃、全光纖等構(gòu)成。（2）空心線圈電流互感器。又稱為Rogowski線圈式電流互感器。
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因?yàn)锽G1集電極與BG2基極相連，IC1又是BG2的基極電流Ib2。BG2又把比Ib2（Ib1）放大了β2的集電極電流IC2送回BG1的基極放大。如此循環(huán)放大，直到BGBG2完全導(dǎo)通。實(shí)際這一過程是“一觸即發(fā)”的過程，對(duì)可控硅來說，觸發(fā)信號(hào)加入控制極，可控硅立即導(dǎo)通。導(dǎo)通的時(shí)間主要決定于可控硅的性能?？煽毓枰唤?jīng)觸發(fā)導(dǎo)通后，由于循環(huán)反饋的原因，流入BG1基極的電流已不只是初始的Ib1，而是經(jīng)過BGBG2放大后的電流（β1*β2*Ib1）這一電流遠(yuǎn)大于Ib1，足以保持BG1的持續(xù)導(dǎo)通。此時(shí)觸發(fā)信號(hào)即使消失，可控硅仍保持導(dǎo)通狀態(tài)只有斷開電源Ea或降低Ea，使BGBG2中的集電極電流小于維持導(dǎo)通的值時(shí)。
東營市BUMHAN電抗器BHSR-18H,BHSR-24H,BHSR-30H
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DIV-9CR-W DIV-9CR-X DIV-9CR-Y DIV-9CR-Z
DIV-9CN-W DIV-9CN-X DIV-9CN-Y DIV-9CN-Z
對(duì)于小型電器，如玩具、遙控裝置則應(yīng)選用超小型繼電器產(chǎn)品。反時(shí)限編輯反時(shí)限過流繼電器是具有反時(shí)限特性，用于發(fā)電機(jī)、變壓器及輸配電系統(tǒng)的繼電器保護(hù)裝置中。在設(shè)備過負(fù)荷或短路時(shí)，能按預(yù)定的時(shí)限可靠動(dòng)作，發(fā)出信號(hào)或切除故障部分。該繼電器為集成電路靜態(tài)型繼電器，采用數(shù)碼開關(guān)整定電流值，直觀方便，改變整定值無須檢驗(yàn)，整定范圍為2-9.9A級(jí)差為0.1A；精度高、功耗小、動(dòng)作時(shí)間快、返回系數(shù)高。正常環(huán)境編輯編輯使用地點(diǎn)不出現(xiàn)超過GB/T14537規(guī)定的嚴(yán)酷等級(jí)為1級(jí)的振動(dòng)。周圍環(huán)境：不允許有陽光直射、雨和水的沖洗，無危險(xiǎn)的介質(zhì)，不應(yīng)含有能腐蝕金屬、破壞絕緣和表面涂覆層的介質(zhì)及導(dǎo)電介質(zhì)，不允許有明顯的水氣。
東營市BUMHAN電抗器BHSR-18H,BHSR-24H,BHSR-30H
DIV-9D1-W DIV-9D1-X DIV-9D1-Y DIV-9D1-Z
DIV-9D2-W DIV-9D2-X DIV-9D2-Y DIV-9D2-Z
DIV-9D3-W DIV-9D3-X DIV-9D3-Y DIV-9D3-Z
DIV-9D4-W DIV-9D4-X DIV-9D4-Y DIV-9D4-Z
DIV-9D5-W DIV-9D5-X DIV-9D5-Y DIV-9D5-Z
DIV-9D6-W DIV-9D6-X DIV-9D6-Y DIV-9D6-Z
DIV-9D7-W DIV-9D7-X DIV-9D7-Y DIV-9D7-Z
DIV-9D8-W DIV-9D8-X DIV-9D8-Y DIV-9D8-Z
DIV-9DR-W DIV-9DR-X DIV-9DR-Y DIV-9DR-Z
DIV-9DN-W DIV-9DN-X DIV-9DN-Y DIV-9DN-Z
DIV-9E1-W DIV-9E1-X DIV-9E1-Y DIV-9E1-Z
DIV-9E2-W DIV-9E2-X DIV-9E2-Y DIV-9E2-Z
DIV-9E3-W DIV-9E3-X DIV-9E3-Y DIV-9E3-Z
DIV-9E4-W DIV-9E4-X DIV-9E4-Y DIV-9E4-Z
DIV-9E5-W DIV-9E5-X DIV-9E5-Y DIV-9E5-Z
DIV-9E6-W DIV-9E6-X DIV-9E6-Y DIV-9E6-Z
DIV-9E7-W DIV-9E7-X DIV-9E7-Y DIV-9E7-Z
DIV-9E8-W DIV-9E8-X DIV-9E8-Y DIV-9E8-Z
DIV-9ER-W DIV-9ER-X DIV-9ER-Y DIV-9ER-Z
DIV-9EN-W DIV-9EN-X DIV-9EN-Y DIV-9EN-Z
DIV-9F1-W DIV-9F1-X DIV-9F1-Y DIV-9F1-Z
DIV-9F2-W DIV-9F2-X DIV-9F2-Y DIV-9F2-Z
DIV-9F3-W DIV-9F3-X DIV-9F3-Y DIV-9F3-Z
DIV-9F4-W DIV-9F4-X DIV-9F4-Y DIV-9F4-Z
DIV-9F5-W DIV-9F5-X DIV-9F5-Y DIV-9F5-Z
結(jié)構(gòu)上也比較簡單。但是簡單電路也可能會(huì)產(chǎn)生疑難故障。開關(guān)電源的檢修不像線性電源那么直觀，電路的任一個(gè)小環(huán)節(jié)一振蕩、穩(wěn)壓、保護(hù)、負(fù)載等出現(xiàn)異常，都會(huì)使電路出現(xiàn)各種各樣的故障現(xiàn)象。上電后無反應(yīng)，操作顯示面板無顯示，變頻器好像沒通電一樣。測(cè)量控制端子的控制電壓和10V頻率調(diào)整電壓都為0，測(cè)量變頻器主接線端子電阻正常，那么大致上可以斷定問題是出在開關(guān)電源電路了。過熱保護(hù)編輯主要有以下幾點(diǎn)：⑴風(fēng)扇運(yùn)轉(zhuǎn)保護(hù)變頻器的內(nèi)裝風(fēng)扇是箱體內(nèi)部散熱的主要手段，它將保證控制電路的正常工作。所以，如果風(fēng)扇運(yùn)轉(zhuǎn)不正常，應(yīng)立即進(jìn)行保護(hù)；⑵逆變模塊散熱板的過熱保護(hù)逆變模塊是變頻器內(nèi)發(fā)生熱量的主要部件，也是變頻器中重要而又脆弱的部件。
東營市BUMHAN電抗器BHSR-18H,BHSR-24H,BHSR-30H
DIV-9F6-W DIV-9F6-X DIV-9F6-Y DIV-9F6-Z
DIV-9F7-W DIV-9F7-X DIV-9F7-Y DIV-9F7-Z
DIV-9F8-W DIV-9F8-X DIV-9F8-Y DIV-9F8-Z
DIV-9FR-W DIV-9FR-X DIV-9FR-Y DIV-9FR-Z
DIV-9FN-W DIV-9FN-X DIV-9FN-Y DIV-9FN-Z
DIV-9G1-W DIV-9G1-X DIV-9G1-Y DIV-9G1-Z
DIV-9G2-W DIV-9G2-X DIV-9G2-Y DIV-9G2-Z
DIV-9G3-W DIV-9G3-X DIV-9G3-Y DIV-9G3-Z
DIV-9G4-W DIV-9G4-X DIV-9G4-Y DIV-9G4-Z
DIV-9G5-W DIV-9G5-X DIV-9G5-Y DIV-9G5-Z
DIV-9G6-W DIV-9G6-X DIV-9G6-Y DIV-9G6-Z
DIV-9G7-W DIV-9G7-X DIV-9G7-Y DIV-9G7-Z
DIV-9G8-W DIV-9G8-X DIV-9G8-Y DIV-9G8-Z
DIV-9GR-W DIV-9GR-X DIV-9GR-Y DIV-9GR-Z
DIV-9GN-W DIV-9GN-X DIV-9GN-Y DIV-9GN-Z
DIV-9H1-W DIV-9H1-X DIV-9H1-Y DIV-9H1-Z
DIV-9H2-W DIV-9H2-X DIV-9H2-Y DIV-9H2-Z
DIV-9H3-W DIV-9H3-X DIV-9H3-Y DIV-9H3-Z
DIV-9H4-W DIV-9H4-X DIV-9H4-Y DIV-9H4-Z
DIV-9H5-W DIV-9H5-X DIV-9H5-Y DIV-9H5-Z
DIV-9H6-W DIV-9H6-X DIV-9H6-Y DIV-9H6-Z
DIV-9H7-W DIV-9H7-X DIV-9H7-Y DIV-9H7-Z
DIV-9H8-W DIV-9H8-X DIV-9H8-Y DIV-9H8-Z
DIV-9HR-W DIV-9HR-X DIV-9HR-Y DIV-9HR-Z
DIV-9HN-W DIV-9HN-X DIV-9HN-Y DIV-9HN-Z
為0.1秒，不能有效地保護(hù)晶閘管）。設(shè)計(jì)時(shí)可依據(jù)廠家提供的產(chǎn)品樣本，根據(jù)軟起動(dòng)器的額定電流選擇相應(yīng)的快熔斷器。3）當(dāng)軟起動(dòng)器使電機(jī)制動(dòng)停機(jī)時(shí)，只是晶閘管不導(dǎo)通，在電機(jī)與電源之間并沒有形成電氣隔離。如果此時(shí)檢修軟起動(dòng)器之后的線路、電機(jī)，那是不的。所以在電機(jī)一次控制回路中應(yīng)在軟起動(dòng)器之前增加斷路器。4）由于信息及網(wǎng)絡(luò)技術(shù)的飛速發(fā)展，現(xiàn)代的樓宇特別是智能建筑中電子設(shè)備日益增多，它們對(duì)電網(wǎng)的質(zhì)量有較高的要求。而由于軟起動(dòng)器采用了可控硅等非線性器件，所以當(dāng)軟起動(dòng)器功率較大或者臺(tái)數(shù)較多時(shí)，產(chǎn)生的高次諧波將對(duì)電網(wǎng)造成不良的影響并對(duì)建筑物內(nèi)的電子設(shè)備產(chǎn)生干撓。此時(shí)可裝設(shè)旁通接觸器。在軟起動(dòng)器使電機(jī)平穩(wěn)起動(dòng)至正常轉(zhuǎn)速后。
東營市BUMHAN電抗器BHSR-18H,BHSR-24H,BHSR-30H
