聯系電話：13917768445
聯系電話：13917768445
摘要：電動機保護器作(zuo)(zuo)為拖動(dong)系統中(zhong)(zhong)的重要(yao)組成部(bu)分(fen)，對電動(dong)機的起動(dong)和運行中(zhong)(zhong)保(bao)護(hu)起著至(zhi)關重要(yao)的作(zuo)(zuo)用。本文分(fen)析了電動(dong)機保(bao)護(hu)器保(bao)護(hu)及構成原(yuan)理(li)，并闡述(shu)了電動(dong)機保(bao)護(hu)器在(zai)發展過程中(zhong)(zhong)的應用及選擇原(yuan)則。
關(guan)鍵(jian)詞：電動機(ji)；保(bao)護器；保(bao)護原理；應用
1、引言
電(dian)(dian)(dian)動(dong)(dong)(dong)(dong)機(ji)(ji)是(shi)(shi)當前應(ying)用(yong)廣泛的(de)(de)動(dong)(dong)(dong)(dong)力設備(bei)，是(shi)(shi)其他機(ji)(ji)電(dian)(dian)(dian)設備(bei)的(de)(de)動(dong)(dong)(dong)(dong)力源泉，電(dian)(dian)(dian)動(dong)(dong)(dong)(dong)機(ji)(ji)正常(chang)(chang)的(de)(de)輸(shu)出是(shi)(shi)其驅動(dong)(dong)(dong)(dong)的(de)(de)機(ji)(ji)電(dian)(dian)(dian)設備(bei)正常(chang)(chang)工(gong)作(zuo)的(de)(de)前提，如(ru)今已被廣泛應(ying)用(yong)于工(gong)農(nong)業、交通(tong)運輸(shu)、國(guo)(guo)防(fang)等領域(yu)。電(dian)(dian)(dian)動(dong)(dong)(dong)(dong)機(ji)(ji)所(suo)帶的(de)(de)負載(zai)種類繁多，且往往是(shi)(shi)整個設備(bei)中(zhong)的(de)(de)關(guan)鍵部分，因(yin)而確保(bao)電(dian)(dian)(dian)動(dong)(dong)(dong)(dong)機(ji)(ji)的(de)(de)正常(chang)(chang)運行(xing)就顯得十分重要(yao)。電(dian)(dian)(dian)動(dong)(dong)(dong)(dong)機(ji)(ji)保(bao)護(hu)(hu)(hu)(hu)器(qi)(qi)(電(dian)(dian)(dian)機(ji)(ji)保(bao)護(hu)(hu)(hu)(hu)器(qi)(qi))是(shi)(shi)發電(dian)(dian)(dian)、供電(dian)(dian)(dian)、用(yong)電(dian)(dian)(dian)系統的(de)(de)重要(yao)器(qi)(qi)件，是(shi)(shi)跨行(xing)業、量大(da)面廣、節能效果(guo)顯著的(de)(de)節能機(ji)(ji)電(dian)(dian)(dian)產(chan)品[1]。電(dian)(dian)(dian)動(dong)(dong)(dong)(dong)機(ji)(ji)保(bao)護(hu)(hu)(hu)(hu)器(qi)(qi)的(de)(de)作(zuo)用(yong)是(shi)(shi)給電(dian)(dian)(dian)機(ji)(ji)的(de)(de)保(bao)護(hu)(hu)(hu)(hu)控制，在電(dian)(dian)(dian)機(ji)(ji)出現過(guo)流(liu)、欠(qian)流(liu)、斷相、堵轉、短路、過(guo)壓、欠(qian)壓、漏電(dian)(dian)(dian)、三相不(bu)(bu)平衡、過(guo)熱、接(jie)地、軸承(cheng)磨損(sun)、定轉子偏心時、繞組(zu)老化予(yu)以(yi)報警或保(bao)護(hu)(hu)(hu)(hu)控制。如(ru)今電(dian)(dian)(dian)動(dong)(dong)(dong)(dong)機(ji)(ji)保(bao)護(hu)(hu)(hu)(hu)器(qi)(qi)幾(ji)乎滲(shen)透到所(suo)有用(yong)電(dian)(dian)(dian)領域(yu)，在國(guo)(guo)民經濟(ji)和(he)節能事業中(zhong)有著不(bu)(bu)可替代的(de)(de)重要(yao)地位和(he)作(zuo)用(yong)。
2、電動機保護器的保護原理與構成
對電動(dong)機來(lai)說，其故(gu)障形式從機械角度可以分為繞組損(sun)壞和軸(zhou)承損(sun)壞兩方面。
造成繞組損壞(huai)的主要原因有：
1．電動機長時間(jian)的電、熱、機械(xie)和(he)化(hua)學作用下，繞(rao)組(zu)的絕緣老化(hua)損壞，定轉子繞(rao)組(zu)匝問短路(lu)或是(shi)對地短路(lu)。
2．電(dian)網供電(dian)質量差，電(dian)源電(dian)壓(ya)(ya)三相不平(ping)衡、電(dian)壓(ya)(ya)波(bo)(bo)動大(da)、電(dian)網電(dian)壓(ya)(ya)波(bo)(bo)形畸變、高次諧波(bo)(bo)嚴重或者電(dian)動機斷相運行。
3．電源電壓過(guo)(guo)低使得電動機(ji)啟動轉矩不(bu)夠，電動機(ji)不(bu)能順(shun)利啟動或(huo)者是在短時間內重復啟動，電動機(ji)長(chang)時間承受(shou)過(guo)(guo)大的啟動電流(liu)導致電機(ji)過(guo)(guo)熱(re)。
4．因機(ji)械故障或其它(ta)原因造成電動機(ji)轉子堵(du)轉。
5．某些大型電機冷卻系統(tong)故(gu)障(zhang)或(huo)是長時間工作在(zai)高(gao)溫高(gao)濕環境下造成電機故(gu)障(zhang)。
電動(dong)機保護原理的(de)研究是保證電動(dong)機保護器性能高低的(de)關鍵，根據三(san)相對(dui)稱(cheng)分(fen)量法(fa)的(de)理論，三(san)個不(bu)對(dui)稱(cheng)的(de)向量可(ke)以(yi)分(fen)解成三(san)組(zu)對(dui)稱(cheng)的(de)向量，分(fen)別為正序分(fen)量、負序分(fen)量和(he)零序分(fen)量。
根據對稱(cheng)(cheng)(cheng)分量的(de)(de)(de)(de)(de)計算公式(shi)式(shi)，電(dian)(dian)(dian)(dian)(dian)動(dong)(dong)機在(zai)發生(sheng)對稱(cheng)(cheng)(cheng)故(gu)(gu)障(zhang)和不對稱(cheng)(cheng)(cheng)故(gu)(gu)障(zhang)時(shi)，電(dian)(dian)(dian)(dian)(dian)動(dong)(dong)機的(de)(de)(de)(de)(de)三(san)相電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)都會(hui)發生(sheng)變化。電(dian)(dian)(dian)(dian)(dian)動(dong)(dong)機故(gu)(gu)障(zhang)條件(jian)流(liu)(liu)過(guo)(guo)繞組的(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)過(guo)(guo)大(da)，超過(guo)(guo)電(dian)(dian)(dian)(dian)(dian)動(dong)(dong)機的(de)(de)(de)(de)(de)額定(ding)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)，因此(ci)可(ke)根據這一(yi)特(te)征來(lai)對電(dian)(dian)(dian)(dian)(dian)動(dong)(dong)機過(guo)(guo)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)進行(xing)保護(hu)(hu)。電(dian)(dian)(dian)(dian)(dian)機過(guo)(guo)載、斷相、欠(qian)壓都會(hui)造(zao)成繞組電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)超過(guo)(guo)額定(ding)值。電(dian)(dian)(dian)(dian)(dian)源(yuan)電(dian)(dian)(dian)(dian)(dian)壓欠(qian)壓，運(yun)行(xing)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)上升的(de)(de)(de)(de)(de)比(bi)例(li)將等(deng)于電(dian)(dian)(dian)(dian)(dian)壓下(xia)降的(de)(de)(de)(de)(de)比(bi)例(li)；電(dian)(dian)(dian)(dian)(dian)機過(guo)(guo)載時(shi)，常造(zao)成堵轉，此(ci)時(shi)的(de)(de)(de)(de)(de)運(yun)行(xing)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)會(hui)大(da)大(da)超過(guo)(guo)額定(ding)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)。針對以上情況，電(dian)(dian)(dian)(dian)(dian)動(dong)(dong)機保護(hu)(hu)器可(ke)通過(guo)(guo)對三(san)相運(yun)行(xing)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)進行(xing)檢(jian)測，根據運(yun)行(xing)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)的(de)(de)(de)(de)(de)不同(tong)性質來(lai)確定(ding)不同(tong)的(de)(de)(de)(de)(de)保護(hu)(hu)方式(shi)，從(cong)而對電(dian)(dian)(dian)(dian)(dian)機予以的(de)(de)(de)(de)(de)斷電(dian)(dian)(dian)(dian)(dian)保護(hu)(hu)。電(dian)(dian)(dian)(dian)(dian)動(dong)(dong)機的(de)(de)(de)(de)(de)故(gu)(gu)障(zhang)類型分為過(guo)(guo)流(liu)(liu)保護(hu)(hu)、負序(xu)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)保護(hu)(hu)、零序(xu)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)保護(hu)(hu)、電(dian)(dian)(dian)(dian)(dian)壓保護(hu)(hu)和過(guo)(guo)熱保護(hu)(hu)等(deng)幾種。
通(tong)過對電(dian)(dian)(dian)(dian)(dian)(dian)動(dong)機保護(hu)器(qi)的保護(hu)原(yuan)理(li)(li)分析可以看出(chu)，理(li)(li)想的電(dian)(dian)(dian)(dian)(dian)(dian)動(dong)機保護(hu)器(qi)應滿(man)足(zu)可靠、經濟、方(fang)便等要素，具有較高的性能價(jia)格比(bi)。經過發(fa)展(zhan)和更(geng)新(xin)，如今電(dian)(dian)(dian)(dian)(dian)(dian)動(dong)機保護(hu)器(qi)一般由電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)檢測(ce)電(dian)(dian)(dian)(dian)(dian)(dian)路(lu)、溫(wen)度檢測(ce)電(dian)(dian)(dian)(dian)(dian)(dian)路(lu)、基(ji)準電(dian)(dian)(dian)(dian)(dian)(dian)壓電(dian)(dian)(dian)(dian)(dian)(dian)路(lu)、邏輯處理(li)(li)電(dian)(dian)(dian)(dian)(dian)(dian)路(lu)、時序處理(li)(li)電(dian)(dian)(dian)(dian)(dian)(dian)路(lu)、啟動(dong)封鎖及復位(wei)電(dian)(dian)(dian)(dian)(dian)(dian)路(lu)、故障(zhang)記錄電(dian)(dian)(dian)(dian)(dian)(dian)路(lu)、驅(qu)動(dong)電(dian)(dian)(dian)(dian)(dian)(dian)路(lu)、電(dian)(dian)(dian)(dian)(dian)(dian)動(dong)機控(kong)制電(dian)(dian)(dian)(dian)(dian)(dian)路(lu)組成。
3、電動機保護器的類型及應用分析
目(mu)(mu)前我國普遍采(cai)(cai)(cai)用的(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)動(dong)(dong)(dong)(dong)(dong)(dong)機(ji)(ji)(ji)(ji)保(bao)護(hu)(hu)器(qi)主(zhu)要有熱(re)(re)繼(ji)電(dian)(dian)(dian)(dian)(dian)(dian)器(qi)、溫度(du)繼(ji)電(dian)(dian)(dian)(dian)(dian)(dian)器(qi)和電(dian)(dian)(dian)(dian)(dian)(dian)子(zi)式(shi)電(dian)(dian)(dian)(dian)(dian)(dian)動(dong)(dong)(dong)(dong)(dong)(dong)機(ji)(ji)(ji)(ji)保(bao)護(hu)(hu)器(qi)。熱(re)(re)繼(ji)電(dian)(dian)(dian)(dian)(dian)(dian)器(qi)是(shi)(shi)五十年代初引進蘇聯技術開(kai)發的(de)(de)(de)金(jin)(jin)屬(shu)片(pian)(pian)機(ji)(ji)(ji)(ji)械(xie)式(shi)電(dian)(dian)(dian)(dian)(dian)(dian)動(dong)(dong)(dong)(dong)(dong)(dong)機(ji)(ji)(ji)(ji)過(guo)載(zai)保(bao)護(hu)(hu)器(qi)，它在(zai)保(bao)護(hu)(hu)電(dian)(dian)(dian)(dian)(dian)(dian)動(dong)(dong)(dong)(dong)(dong)(dong)機(ji)(ji)(ji)(ji)過(guo)載(zai)方(fang)面(mian)具有反時限(xian)(xian)性(xing)(xing)能(neng)和結(jie)(jie)構簡單(dan)的(de)(de)(de)特(te)點。但(dan)存在(zai)功能(neng)少，無斷(duan)相保(bao)護(hu)(hu)，對(dui)電(dian)(dian)(dian)(dian)(dian)(dian)機(ji)(ji)(ji)(ji)發生(sheng)通(tong)(tong)風(feng)不暢，掃膛(tang)、堵(du)轉、長(chang)期過(guo)載(zai)，頻(pin)繁(fan)啟動(dong)(dong)(dong)(dong)(dong)(dong)等故障不起保(bao)護(hu)(hu)作(zuo)(zuo)(zuo)用。這主(zhu)要是(shi)(shi)因為熱(re)(re)繼(ji)電(dian)(dian)(dian)(dian)(dian)(dian)器(qi)動(dong)(dong)(dong)(dong)(dong)(dong)作(zuo)(zuo)(zuo)曲線和電(dian)(dian)(dian)(dian)(dian)(dian)動(dong)(dong)(dong)(dong)(dong)(dong)機(ji)(ji)(ji)(ji)實際保(bao)護(hu)(hu)曲線不一致(zhi)(zhi)，失(shi)去(qu)了(le)保(bao)護(hu)(hu)作(zuo)(zuo)(zuo)用。且重復性(xing)(xing)能(neng)差，大電(dian)(dian)(dian)(dian)(dian)(dian)流過(guo)載(zai)或(huo)(huo)短路故障后不能(neng)再次使用，調整(zheng)(zheng)誤差大、易受環境(jing)溫度(du)的(de)(de)(de)影(ying)響誤動(dong)(dong)(dong)(dong)(dong)(dong)或(huo)(huo)拒動(dong)(dong)(dong)(dong)(dong)(dong)，功耗大、耗材多、性(xing)(xing)能(neng)指(zhi)標(biao)落后等缺陷。溫度(du)繼(ji)電(dian)(dian)(dian)(dian)(dian)(dian)器(qi)是(shi)(shi)采(cai)(cai)(cai)用雙金(jin)(jin)屬(shu)片(pian)(pian)制成的(de)(de)(de)盤(pan)式(shi)或(huo)(huo)其(qi)他形(xing)式(shi)的(de)(de)(de)繼(ji)電(dian)(dian)(dian)(dian)(dian)(dian)器(qi)，在(zai)電(dian)(dian)(dian)(dian)(dian)(dian)動(dong)(dong)(dong)(dong)(dong)(dong)機(ji)(ji)(ji)(ji)中埋入熱(re)(re)元件，根據電(dian)(dian)(dian)(dian)(dian)(dian)動(dong)(dong)(dong)(dong)(dong)(dong)機(ji)(ji)(ji)(ji)的(de)(de)(de)溫度(du)進行保(bao)護(hu)(hu)，但(dan)電(dian)(dian)(dian)(dian)(dian)(dian)動(dong)(dong)(dong)(dong)(dong)(dong)機(ji)(ji)(ji)(ji)容量較大時，需與電(dian)(dian)(dian)(dian)(dian)(dian)流監測型配合使用，避(bi)免電(dian)(dian)(dian)(dian)(dian)(dian)動(dong)(dong)(dong)(dong)(dong)(dong)機(ji)(ji)(ji)(ji)堵(du)轉時溫度(du)急劇上升，由于測溫元件的(de)(de)(de)滯后性(xing)(xing)，導致(zhi)(zhi)電(dian)(dian)(dian)(dian)(dian)(dian)動(dong)(dong)(dong)(dong)(dong)(dong)機(ji)(ji)(ji)(ji)繞組受損(sun)。溫度(du)繼(ji)電(dian)(dian)(dian)(dian)(dian)(dian)器(qi)具有結(jie)(jie)構簡單(dan)、動(dong)(dong)(dong)(dong)(dong)(dong)作(zuo)(zuo)(zuo)可靠，保(bao)護(hu)(hu)范圍廣泛等優點，但(dan)動(dong)(dong)(dong)(dong)(dong)(dong)作(zuo)(zuo)(zuo)緩慢，返回時間長(chang)，3KW以上的(de)(de)(de)三(san)角形(xing)接法(fa)電(dian)(dian)(dian)(dian)(dian)(dian)動(dong)(dong)(dong)(dong)(dong)(dong)機(ji)(ji)(ji)(ji)不宜使用。目(mu)(mu)前在(zai)電(dian)(dian)(dian)(dian)(dian)(dian)風(feng)扇、電(dian)(dian)(dian)(dian)(dian)(dian)冰箱(xiang)、空調壓縮(suo)機(ji)(ji)(ji)(ji)等方(fang)面(mian)大量使用。電(dian)(dian)(dian)(dian)(dian)(dian)子(zi)式(shi)電(dian)(dian)(dian)(dian)(dian)(dian)動(dong)(dong)(dong)(dong)(dong)(dong)機(ji)(ji)(ji)(ji)保(bao)護(hu)(hu)器(qi)通(tong)(tong)過(guo)檢(jian)測三(san)相電(dian)(dian)(dian)(dian)(dian)(dian)流值和整(zheng)(zheng)定電(dian)(dian)(dian)(dian)(dian)(dian)流值，采(cai)(cai)(cai)用電(dian)(dian)(dian)(dian)(dian)(dian)位(wei)器(qi)旋鈕(niu)或(huo)(huo)拔碼開(kai)關操(cao)作(zuo)(zuo)(zuo)來(lai)實現對(dui)電(dian)(dian)(dian)(dian)(dian)(dian)動(dong)(dong)(dong)(dong)(dong)(dong)機(ji)(ji)(ji)(ji)的(de)(de)(de)保(bao)護(hu)(hu)，電(dian)(dian)(dian)(dian)(dian)(dian)路一般采(cai)(cai)(cai)用模擬式(shi)，采(cai)(cai)(cai)用反時限(xian)(xian)或(huo)(huo)定時限(xian)(xian)工作(zuo)(zuo)(zuo)特(te)性(xing)(xing)。
除了上述三種常見(jian)的(de)電(dian)(dian)(dian)(dian)(dian)(dian)動機(ji)保(bao)護(hu)(hu)(hu)(hu)器(qi)，磁(ci)(ci)場溫度(du)(du)檢測(ce)型(xing)(xing)(xing)繼電(dian)(dian)(dian)(dian)(dian)(dian)器(qi)和智(zhi)(zhi)能(neng)型(xing)(xing)(xing)電(dian)(dian)(dian)(dian)(dian)(dian)動機(ji)保(bao)護(hu)(hu)(hu)(hu)器(qi)也在(zai)(zai)電(dian)(dian)(dian)(dian)(dian)(dian)動機(ji)故障保(bao)護(hu)(hu)(hu)(hu)中得(de)到普遍應用。磁(ci)(ci)場溫度(du)(du)檢測(ce)型(xing)(xing)(xing)保(bao)護(hu)(hu)(hu)(hu)器(qi)通(tong)過(guo)(guo)在(zai)(zai)電(dian)(dian)(dian)(dian)(dian)(dian)動機(ji)中埋入(ru)磁(ci)(ci)場檢測(ce)線圈和溫度(du)(du)探(tan)頭，根據電(dian)(dian)(dian)(dian)(dian)(dian)動機(ji)內(nei)部(bu)旋(xuan)轉磁(ci)(ci)場的(de)變(bian)化和溫度(du)(du)的(de)變(bian)化進(jin)行保(bao)護(hu)(hu)(hu)(hu)，主要功能(neng)包(bao)括過(guo)(guo)載(zai)、堵轉、缺相、過(guo)(guo)熱保(bao)護(hu)(hu)(hu)(hu)和磨損(sun)監測(ce)，保(bao)護(hu)(hu)(hu)(hu)功能(neng)完善，缺點是需在(zai)(zai)電(dian)(dian)(dian)(dian)(dian)(dian)動機(ji)內(nei)部(bu)安裝磁(ci)(ci)場檢測(ce)線圈和溫度(du)(du)傳(chuan)感器(qi)。智(zhi)(zhi)能(neng)型(xing)(xing)(xing)電(dian)(dian)(dian)(dian)(dian)(dian)動機(ji)保(bao)護(hu)(hu)(hu)(hu)器(qi)能(neng)實現電(dian)(dian)(dian)(dian)(dian)(dian)動機(ji)智(zhi)(zhi)能(neng)化綜合保(bao)護(hu)(hu)(hu)(hu)，集保(bao)護(hu)(hu)(hu)(hu)、測(ce)量、通(tong)訊、顯示為一體。整(zheng)定(ding)電(dian)(dian)(dian)(dian)(dian)(dian)流采用數字設定(ding)，通(tong)過(guo)(guo)操作面(mian)板(ban)按鈕來操作，用戶可(ke)以根據自(zi)己實際使用要求和保(bao)護(hu)(hu)(hu)(hu)情況在(zai)(zai)現場自(zi)行對(dui)各種參(can)數修正(zheng)設定(ding)，采用數碼管作為顯示窗El，或采用大屏幕(mu)液晶顯示，能(neng)支持多種通(tong)訊協議，目前高壓電(dian)(dian)(dian)(dian)(dian)(dian)動機(ji)保(bao)護(hu)(hu)(hu)(hu)均(jun)采用智(zhi)(zhi)能(neng)型(xing)(xing)(xing)。
4、電動機保護器應用選擇原則
選(xuan)(xuan)用電(dian)(dian)動(dong)機保(bao)(bao)護(hu)(hu)裝置的(de)(de)(de)(de)目的(de)(de)(de)(de)，既能(neng)(neng)(neng)(neng)(neng)使電(dian)(dian)動(dong)機充分(fen)發揮過(guo)載(zai)能(neng)(neng)(neng)(neng)(neng)力(li)，又(you)能(neng)(neng)(neng)(neng)(neng)免(mian)于損壞，而且(qie)還(huan)能(neng)(neng)(neng)(neng)(neng)提(ti)(ti)高電(dian)(dian)力(li)拖動(dong)系(xi)統(tong)的(de)(de)(de)(de)可(ke)靠(kao)(kao)性(xing)(xing)(xing)(xing)(xing)和生(sheng)產的(de)(de)(de)(de)連續(xu)性(xing)(xing)(xing)(xing)(xing)。合理(li)選(xuan)(xuan)用電(dian)(dian)機保(bao)(bao)護(hu)(hu)裝置，既能(neng)(neng)(neng)(neng)(neng)充分(fen)發揮電(dian)(dian)機的(de)(de)(de)(de)過(guo)載(zai)能(neng)(neng)(neng)(neng)(neng)力(li)，又(you)能(neng)(neng)(neng)(neng)(neng)免(mian)于損壞，從而提(ti)(ti)高電(dian)(dian)力(li)拖動(dong)系(xi)統(tong)的(de)(de)(de)(de)可(ke)靠(kao)(kao)性(xing)(xing)(xing)(xing)(xing)和生(sheng)產的(de)(de)(de)(de)連續(xu)性(xing)(xing)(xing)(xing)(xing)。具體的(de)(de)(de)(de)功能(neng)(neng)(neng)(neng)(neng)選(xuan)(xuan)擇應(ying)綜(zong)合考(kao)慮電(dian)(dian)機的(de)(de)(de)(de)本身(shen)的(de)(de)(de)(de)價(jia)值、負載(zai)類型、使用環境、電(dian)(dian)機主體設(she)備的(de)(de)(de)(de)重(zhong)要程(cheng)度(du)、電(dian)(dian)機退(tui)出運行是否對生(sheng)產系(xi)統(tong)造成嚴(yan)重(zhong)影響等因素(su)，力(li)爭做到(dao)經濟合理(li)。在(zai)能(neng)(neng)(neng)(neng)(neng)滿足保(bao)(bao)護(hu)(hu)要求(qiu)的(de)(de)(de)(de)情況下首先考(kao)慮簡單保(bao)(bao)護(hu)(hu)裝置，當簡單的(de)(de)(de)(de)保(bao)(bao)護(hu)(hu)裝置不能(neng)(neng)(neng)(neng)(neng)滿足要求(qiu)時(shi)，或對保(bao)(bao)護(hu)(hu)功能(neng)(neng)(neng)(neng)(neng)和特性(xing)(xing)(xing)(xing)(xing)提(ti)(ti)出更高要求(qiu)時(shi)，才考(kao)慮應(ying)用復雜的(de)(de)(de)(de)保(bao)(bao)護(hu)(hu)裝置，做到(dao)經濟性(xing)(xing)(xing)(xing)(xing)和可(ke)靠(kao)(kao)性(xing)(xing)(xing)(xing)(xing)的(de)(de)(de)(de)統(tong)一。
5、結束語
如今電(dian)(dian)動(dong)機保(bao)護(hu)器(qi)已發展到了微電(dian)(dian)子(zi)智能(neng)型時(shi)(shi)(shi)代，電(dian)(dian)動(dong)機保(bao)護(hu)器(qi)也朝(chao)著多元化方向(xiang)發展。這(zhe)就需要我們(men)的工作人員在選型時(shi)(shi)(shi)應充分考慮電(dian)(dian)動(dong)機保(bao)護(hu)實際需求(qiu)，超前、準確、及時(shi)(shi)(shi)地判斷電(dian)(dian)動(dong)機的故障(zhang)，合理選擇保(bao)護(hu)功能(neng)和保(bao)護(hu)方式，實現對電(dian)(dian)動(dong)機的良好保(bao)護(hu)，達到提高設(she)備(bei)運行可靠性，減少非(fei)計劃停車，減少事(shi)故損失的目的。
