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摘 要 ：我們都知(zhi)道萬用表(biao)(biao)(biao)(biao)和(he)鉗形表(biao)(biao)(biao)(biao)都是(shi)(shi)可以(yi)測量電(dian)(dian)流、電(dian)(dian)壓和(he)電(dian)(dian)阻的(de)，那么(me)二者之間有(you)什么(me)區(qu)別呢？ 普通(tong)萬用表(biao)(biao)(biao)(biao)與(yu)鉗形表(biao)(biao)(biao)(biao)的(de)對比 萬用表(biao)(biao)(biao)(biao)的(de)基本原理是(shi)(shi)利用一(yi)只(zhi)靈(ling)敏的(de)磁電(dian)(dian)式直流電(dian)(dian)流表(biao)(biao)(biao)(biao)（微安表(biao)(biao)(biao)(biao)）做(zuo)表(biao)(biao)(biao)(biao)頭(tou)。當微小電(dian)(dian)流通(tong)過表(biao)(biao)(biao)(biao)頭(tou)，就會有(you)電(dian)(dian)流顯示(shi)。但是(shi)(shi)表(biao)(biao)(biao)(biao)頭(tou)不可以(yi)通(tong)過大(da)電(dian)(dian)流，所以(yi)必須在表(biao)(biao)(biao)(biao)頭(tou)上并聯(lian)與(yu)串聯(lian)一(yi)些
2020-12-18 -
摘 要 ：斷(duan)(duan)路(lu)器(qi)發(fa)生(sheng)(sheng)“拒(ju)合(he)(he)”情況，基本上是(shi)(shi)發(fa)生(sheng)(sheng)在(zai)合(he)(he)閘(zha)操作和重合(he)(he)閘(zha)過程(cheng)中。此(ci)種(zhong)故障(zhang)危害性比較(jiao)大(da)，例如在(zai)事(shi)故情況下要求(qiu)緊(jin)急投入(ru)備(bei)用電源時，如果備(bei)用電源斷(duan)(duan)路(lu)器(qi)發(fa)生(sheng)(sheng)拒(ju)絕合(he)(he)閘(zha)，則會使事(shi)故進一步擴大(da)。如何判斷(duan)(duan)斷(duan)(duan)路(lu)器(qi)“拒(ju)合(he)(he)”的(de)原因及處(chu)理(li)方(fang)法(fa)一般可以分三個(ge)步驟： 1、檢查(cha)前一次(ci)拒(ju)絕合(he)(he)閘(zha)是(shi)(shi)否是(shi)(shi)因為
2020-12-18 -
摘 要(yao) ：現在(zai)的(de)(de)繼電(dian)器(qi)市場魚龍混雜，有進口的(de)(de)也有國產的(de)(de)，那么哪一種的(de)(de)性(xing)價比較(jiao)高呢？下面(mian)為(wei)(wei)大家分(fen)析一下： 中國擁有希(xi)曼頓，固(gu)特，新佳(jia)，靈(ling)通，欣靈(ling)，美格爾，西子(zi)，天豪為(wei)(wei)代表。就(jiu)(jiu)固(gu)態繼電(dian)器(qi)而言做(zuo)(zuo)的(de)(de)好點的(de)(de)就(jiu)(jiu)屬(shu)希(xi)曼頓，新佳(jia)，西子(zi)和靈(ling)通了。希(xi)曼頓是散熱(re)做(zuo)(zuo)的(de)(de)比較(jiao)好，線路板(ban)工(gong)藝(yi)做(zuo)(zuo)的(de)(de)卻(que)不是很好，
2020-12-18 -
摘 要 ：有人把電(dian)(dian)(dian)源(yuan)(yuan)界定為(wei)經過高(gao)頻(pin)開關變換的直流電(dian)(dian)(dian)源(yuan)(yuan)和(he)交流電(dian)(dian)(dian)源(yuan)(yuan)，在介(jie)紹軟(ruan)磁(ci)電(dian)(dian)(dian)磁(ci)元(yuan)件在電(dian)(dian)(dian)源(yuan)(yuan)技術中的作用(yong)時，往往舉高(gao)頻(pin)開關電(dian)(dian)(dian)源(yuan)(yuan)中的各種電(dian)(dian)(dian)磁(ci)元(yuan)件為(wei)例證。同(tong)時，在電(dian)(dian)(dian)子電(dian)(dian)(dian)源(yuan)(yuan)中使用(yong)的軟(ruan)磁(ci)電(dian)(dian)(dian)磁(ci)元(yuan)件中，各種變壓(ya)器占主(zhu)要地位，也是(shi)電(dian)(dian)(dian)源(yuan)(yuan)中必不(bu)可少(shao)的主(zhu)力(li)軍，因此用(yong)變壓(ya)器作為(wei)電(dian)(dian)(dian)子電(dian)(dian)(dian)源(yuan)(yuan)中軟(ruan)磁(ci)元(yuan)件的代表(biao)，稱它們為(wei)“電(dian)(dian)(dian)
2020-12-18 -
摘 要(yao) ：有關(guan)(guan)報道(dao)稱我(wo)國開關(guan)(guan)電(dian)源(yuan)近年(nian)來(lai)發(fa)展速度飛快。每(mei)年(nian)的(de)(de)(de)銷售額都(dou)會有所增長，其銷售量超過每(mei)年(nian)2000萬(wan)臺(見“開關(guan)(guan)電(dian)源(yuan)的(de)(de)(de)現(xian)狀及發(fa)展趨勢分析(xi)”)。仔細(xi)閱讀就會發(fa)現(xian)原(yuan)來(lai)我(wo)們的(de)(de)(de)生活中到處都(dou)有開關(guan)(guan)電(dian)源(yuan)的(de)(de)(de)身(shen)影(ying)：個(ge)人電(dian)腦和家用(yong)電(dian)器(qi)中都(dou)有它(ta)。本文(wen)僅(jin)就千(qian)瓦級以上電(dian)力電(dian)子范(fan)圍的(de)(de)(de)開關(guan)(guan)電(dian)源(yuan)進(jin)行(xing)討論(lun)。應(ying)該肯定，
2020-12-18 -
摘 要(yao) ：熱繼電(dian)(dian)(dian)(dian)(dian)(dian)器是(shi)用于(yu)電(dian)(dian)(dian)(dian)(dian)(dian)動(dong)(dong)(dong)機或其它電(dian)(dian)(dian)(dian)(dian)(dian)氣(qi)設(she)備、電(dian)(dian)(dian)(dian)(dian)(dian)氣(qi)線(xian)路的過載(zai)(zai)保護(hu)的保護(hu)電(dian)(dian)(dian)(dian)(dian)(dian)器。 電(dian)(dian)(dian)(dian)(dian)(dian)動(dong)(dong)(dong)機在(zai)實際運(yun)行當中(zhong)，如(ru)拖動(dong)(dong)(dong)生產機械進行工(gong)作過程中(zhong)，如(ru)果機械出現不正常的情況或電(dian)(dian)(dian)(dian)(dian)(dian)路異常使電(dian)(dian)(dian)(dian)(dian)(dian)動(dong)(dong)(dong)機遇(yu)到過載(zai)(zai)，則電(dian)(dian)(dian)(dian)(dian)(dian)動(dong)(dong)(dong)機轉速下降、繞(rao)組中(zhong)的電(dian)(dian)(dian)(dian)(dian)(dian)流將增大，使電(dian)(dian)(dian)(dian)(dian)(dian)動(dong)(dong)(dong)機的繞(rao)組溫度(du)升高。若過載(zai)(zai)電(dian)(dian)(dian)(dian)(dian)(dian)流不大且過載(zai)(zai)的時間(jian)較(jiao)短，電(dian)(dian)(dian)(dian)(dian)(dian)動(dong)(dong)(dong)機繞(rao)
2020-12-18 -
摘 要 ：電(dian)能(neng)質量監(jian)(jian)測儀是針對目前(qian)國內諧波監(jian)(jian)測分析裝(zhuang)置的(de)使(shi)用情況，以(yi)及裝(zhuang)置在(zai)運(yun)行過程中出現的(de)問題，保定國電(dian)中科(ke)電(dian)氣有限(xian)公(gong)司在(zai)原有產品的(de)基礎上成(cheng)功改進、開發(fa)出了最新一代(dai)高性(xing)能(neng)、多功能(neng)的(de)電(dian)能(neng)質量在(zai)線監(jian)(jian)測裝(zhuang)置。 其主(zhu)要用途為：有功功率(lv)、可(ke)以(yi)實時監(jian)(jian)測顯示系統頻率(lv)、三相電(dian)壓不平衡度、電(dian)壓偏差、電(dian)網2
2020-12-18 -
摘 要 ：在日常生活(huo)中(zhong)我們(men)經(jing)常可以(yi)(yi)聽見或看見隔(ge)(ge)(ge)離開(kai)關(guan)，但是它具體(ti)的(de)作用是什么我們(men)就不是很清楚了，以(yi)(yi)下(xia)為大(da)家介紹一(yi)下(xia)隔(ge)(ge)(ge)離開(kai)關(guan)中(zhong)的(de)負荷(he)隔(ge)(ge)(ge)離開(kai)關(guan)。 負荷(he)隔(ge)(ge)(ge)離開(kai)關(guan)一(yi)般廣泛應用于(yu)建筑、電力、石(shi)油化工及其他行業的(de)自動化系統和配(pei)電系統。負荷(he)開(kai)關(guan)是由隔(ge)(ge)(ge)離開(kai)關(guan)和熔斷器組合而成的(de)，其中(zhong)是由隔(ge)(ge)(ge)離開(kai)關(guan)斷開(kai)正
2020-12-18 -
摘 要 ：現在有很(hen)多用電(dian)設備都(dou)是(shi)單(dan)相負載，因(yin)此，可以將(jiang)多極(ji)(ji)(ji)接(jie)觸器(qi)的幾(ji)個極(ji)(ji)(ji)并(bing)(bing)聯使(shi)用。如(ru)電(dian)焊變壓器(qi)、電(dian)阻爐等(deng)。當幾(ji)個極(ji)(ji)(ji)并(bing)(bing)聯起來使(shi)用時，可以選擇較小容(rong)量的接(jie)觸器(qi)。但(dan)是(shi)必(bi)須要注(zhu)意，并(bing)(bing)聯后的接(jie)觸器(qi)的約定(ding)發(fa)熱電(dian)流(liu)并(bing)(bing)不完全與并(bing)(bing)聯的極(ji)(ji)(ji)數成正(zheng)比。這(zhe)是(shi)因(yin)為由于積極(ji)(ji)(ji)動、靜觸頭(tou)回路的電(dian)阻值不一定(ding)完全相等(deng)，從而導致(zhi)
2020-12-18 -
摘 要 ：我們(men)都了解什(shen)么(me)是(shi)(shi)開(kai)(kai)(kai)關電(dian)(dian)源(yuan)么(me)，那么(me)下面我就為(wei)大(da)家簡單介紹(shao)一(yi)下什(shen)么(me)是(shi)(shi)開(kai)(kai)(kai)關電(dian)(dian)源(yuan)。 開(kai)(kai)(kai)關電(dian)(dian)源(yuan)就是(shi)(shi)利用現(xian)代的(de)(de)電(dian)(dian)力(li)電(dian)(dian)子技術，控制開(kai)(kai)(kai)關管開(kai)(kai)(kai)斷和(he)開(kai)(kai)(kai)通的(de)(de)時間比率(lv)，從而維持穩(wen)定輸出(chu)電(dian)(dian)壓(ya)的(de)(de)一(yi)種電(dian)(dian)源(yuan)，其一(yi)般是(shi)(shi)由脈沖寬度調(diao)制（PWM）控制IC和(he)MOSFET構成。隨著現(xian)代電(dian)(dian)力(li)電(dian)(dian)子技術的(de)(de)快速(su)發展和(he)創(chuang)新(xin)，
2020-12-18
