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在交流電路中，由電源供給負載的電功率有兩種：yizhongshiyougonggonglv，yizhongshiwugonggonglv。dianyadianliutongxiangwei，dianyuanxiangfuzaigongdian，fuzaibadiannengzhuanhuanchengqitanengliang，jiaoyougong。dianyadianliubutongxiangweibufen，dianyuanyufuzaizhijianjiaohuandianneng，zhebufen(除線路損耗外)電能不轉換(電磁以外的)成其他能量，叫無功。有功功率有功功率是保持用電設備正常運行所需的電功率，也就是將電能轉換為其他形式能量(機械能、光能、熱能)的電功率。比如：5.5千瓦的電動機就是把5.5千瓦的電能轉換為機械能，帶動水泵抽水或脫粒機脫粒;各種照明設備將電能轉換為光能，供人們生活和工作照明。有功功率的符號用P表示，單位有瓦(W)、千瓦(kW)、兆瓦(MW)。有功功率:在交流電路中，電源在一個周期內發出瞬時功率的平均值(或負載電阻所消耗的功率)，稱為"有功功率"。有功功率過低導致線損增加、容量下降、設備使用率下降，從而導致電能浪費加大。無功功率電網中的感性負載(如電機，扼流圈，變壓器，感應式加熱器及電焊機等)都會產生不同程度的電滯，即所謂的電感。感性負載具有這樣一種特性 -----即使所加電壓改變方向，感性負載的這種滯後仍能將電流的方向(如正向)baochiyiduanshijian。yidancunzailezhezhongdianliuyudianyazhijiandexiangweicha，jiuhuichanshengfugonglv，bingbeifankuidaodianwangzhong。dianliudianyazaicixiangweixiangtongshi，youxuyaoxiangtongdaxiaodediannengzaiganxingfuzaizhongjianlicichang，zhezhongcichangfanxiangdiannengjiubeichengzuowugonggonglv。dingyi：在具有電感或電容的電路中，在每半個周期內，把電源能量變成磁場(或電場)能量貯存起來，然後，再釋放，又把貯存的磁場(或電場)能量再返回給電源，隻是進行這種能量的交換，並沒有真正消耗能量，我們把這個交換的功率值，稱為" 無功功率"。wugonggonglvbijiaochouxiang，tashiyongyudianluneidianchangyucichangdejiaohuan，bingyonglaizaidianqishebeizhongjianliheweichicichangdediangonglv。tabuduiwaizuogong，ershizhuanbianweiqitaxingshidenengliang。fanshiyoudiancixianquandedianqishebei，yaojianlicichang，jiuyaoxiaohaowugonggonglv。biru40瓦的日光燈，除需40多瓦有功功率(鎮流器也需消耗一部分有功功率)來發光外，還需80乏左右的無功功率供鎮流器的線圈建立交變磁場用。由於它不對外做功，才被稱之為“無功”。無功功率的符號用Q表示，單位為乏(Var)或千乏(kVar)。無功功率過高的缺點：1)無功功率會導致電流增大和視在功率增加，導致係統容量下降;2)無功功率增加，會使總電流增加，從而使設備和線路的損耗增加;3)使線路的壓降增大，衝擊性無功負載還會使電壓劇烈波動。配電網中的電感性電氣設備如變壓器、電動機、電焊機、空調器、洗衣機、電冰箱、鈉燈、riguangdengdengtouruyunxinghou，bujinyaocongdianliwangzhongxishouyougonggonglvyongyuzuogong，erqiehaiyaoxishouwugonggonglvjianlicichang，zheyangjiudaozhidianlikehudezirangonglvyinshuyibandoubijiaodi。woguoduidianlikehudeyongdian，guidinglebixudadaodegonglvyinshubiaozhun。wugonggonglvjuebushiwuyonggonglv，tadeyongchuhenda。diandongjixuyaojianliheweichixuanzhuancichang，shizhuanzizhuandong，congerdaidongjixieyundong，diandongjidezhuanzicichangjiushikaocongdianyuanqudewugonggonglvjianlide。bianyaqiyetongyangxuyaowugonggonglv，cainengshibianyaqideyicixianquanchanshengcichang，zaiercixianquanganyingchudianya。yinci，meiyouwugonggonglv，diandongjijiubuhuizhuandong，bianyaqiyebunengbianya，jiaoliujiechuqibuhuixihe。weilexingxiangdishuomingzhegewenti，xianjuyigelizi：農nong村cun修xiu水shui利li需xu要yao開kai挖wa土tu方fang運yun土tu，運yun土tu時shi用yong竹zhu筐kuang裝zhuang滿man土tu，挑tiao走zou的de土tu好hao比bi是shi有you功gong功gong率lv，挑tiao空kong竹zhu筐kuang就jiu好hao比bi是shi無wu功gong功gong率lv，竹zhu筐kuang並bing不bu是shi沒mei用yong，沒mei有you竹zhu筐kuang泥ni土tu怎zen麼me運yun到dao堤di上shang呢ne?zaizhengchangqingkuangxia，yongdianshebeibudanyaocongdianyuanqudeyougonggonglv，tongshihaixuyaocongdianyuanqudewugonggonglv。ruguodianwangzhongdewugonggonglvgongbuyingqiu，yongdianshebeijiumeiyouzugoudewugonggonglvlaijianlizhengchangdediancichang，name，zhexieyongdianshebeijiubunengweichizaiedingqingkuangxiagongzuo，yongdianshebeideduandianyajiuyaoxiajiang，congeryingxiangyongdianshebeidezhengchangyunxing。wugonggonglvduigong、用電產生一定的不良影響，主要表現在：(1)降低發電機有功功率的輸出。(2)降低輸、變電設備的供電能力。(3)造成線路電壓損失增大和電能損耗的增加。(4)造(zao)成(cheng)低(di)功(gong)率(lv)因(yin)數(shu)運(yun)行(xing)和(he)電(dian)壓(ya)下(xia)降(jiang)，使(shi)電(dian)氣(qi)設(she)備(bei)容(rong)量(liang)得(de)不(bu)到(dao)充(chong)分(fen)發(fa)揮(hui)。從(cong)發(fa)電(dian)機(ji)和(he)高(gao)壓(ya)輸(shu)電(dian)線(xian)供(gong)給(gei)的(de)無(wu)功(gong)功(gong)率(lv)，遠(yuan)遠(yuan)滿(man)足(zu)不(bu)了(le)負(fu)荷(he)的(de)需(xu)要(yao)，所(suo)以(yi)在(zai)電(dian)網(wang)中(zhong)要(yao)設(she)置(zhi)一(yi)些(xie)無(wu)功(gong)補(bu)償(chang)裝(zhuang)置(zhi)來(lai)補(bu)充(chong)無(wu)功(gong)功(gong)率(lv)，以(yi)保(bao)證(zheng)用(yong)戶(hu)對(dui)無(wu)功(gong)功(gong)率(lv)的(de)需(xu)要(yao)，這(zhe)樣(yang)用(yong)電(dian)設(she)備(bei)才(cai)能(neng)在(zai)額(e)定(ding)電(dian)壓(ya)下(xia)工(gong)作(zuo)。這(zhe)就(jiu)是(shi)電(dian)網(wang)需(xu)要(yao)裝(zhuang)設(she)無(wu)功(gong)補(bu)償(chang)裝(zhuang)置(zhi)的(de)道(dao)理(li)。
實拍：德國霍夫曼VHM銑刀加工演示視頻來源：騰訊視頻
摘 要：電(dian)力(li)變(bian)壓(ya)器(qi)是(shi)變(bian)電(dian)站(zhan)和(he)發(fa)電(dian)站(zhan)的(de)核(he)心(xin)裝(zhuang)置(zhi)，是(shi)保(bao)障(zhang)電(dian)力(li)係(xi)統(tong)運(yun)行(xing)安(an)全(quan)性(xing)與(yu)穩(wen)定(ding)性(xing)的(de)基(ji)礎(chu)，在(zai)電(dian)力(li)變(bian)壓(ya)器(qi)的(de)內(nei)部(bu)組(zu)成(cheng)結(jie)構(gou)中(zhong)，鐵(tie)芯(xin)是(shi)實(shi)現(xian)磁(ci)路(lu)暢(chang)通(tong)、能(neng)量(liang)轉(zhuan)化(hua)和(he)電(dian)力(li)安(an)全(quan)的(de)關(guan)鍵(jian)，相(xiang)關(guan)技(ji)術(shu)人(ren)員(yuan)需(xu)要(yao)從(cong)電(dian)力(li)設(she)備(bei)和(he)電(dian)氣(qi)安(an)全(quan)方(fang)麵(mian)重(zhong)視(shi)變(bian)壓(ya)器(qi)鐵(tie)心(xin)故(gu)障(zhang)的(de)研(yan)究(jiu)，這(zhe)樣(yang)才(cai)能(neng)有(you)效(xiao)保(bao)障(zhang)電(dian)力(li)變(bian)壓(ya)器(qi)的(de)運(yun)行(xing)穩(wen)定(ding)性(xing)。因(yin)此(ci)，本(ben)文(wen)將(jiang)簡(jian)要(yao)闡(chan)述(shu)鐵(tie)心(xin)產(chan)生(sheng)接(jie)地(di)故(gu)障(zhang)的(de)因(yin)素(su)，並(bing)對(dui)變(bian)壓(ya)器(qi)鐵(tie)心(xin)接(jie)地(di)故(gu)障(zhang)進(jin)行(xing)診(zhen)斷(duan)，並(bing)提(ti)出(chu)鐵(tie)心(xin)接(jie)地(di)故(gu)障(zhang)的(de)處(chu)理(li)建(jian)議(yi)。關(guan)鍵(jian)詞(ci)：電力變壓器；鐵心接地故障；paichutiexinshidianlibianyaqizhongyaodejiegouzuchengbufen，bianyaqicitongyunengliangzhuanhuadouxuyaotiexindegongnengzhichi，zaidianlibianyaqishijigongzuozhong，tiexinhuiyouyugaodianyahegaodianliuchanshengjiaoqiangdejiaobiancichang，jineryinfajiaogaodeduididianweicha，zuizhongchanshengbianyaqitiexinyuyouxiangzhijiandefangdianxianxiang，qiangliedefangdianxianxianghuidaozhibianyaqitiexin、繞rao組zu和he殼ke體ti損sun壞huai。能neng夠gou引yin發fa變bian壓ya器qi產chan生sheng故gu障zhang的de因yin素su很hen多duo，鐵tie心xin接jie地di是shi最zui為wei常chang見jian的de故gu障zhang，這zhe一yi故gu障zhang對dui於yu變bian壓ya器qi的de正zheng常chang工gong作zuo帶dai來lai了le很hen大da的de影ying響xiang，相xiang關guan技ji術shu工gong作zuo者zhe需xu要yao及ji時shi發fa現xian鐵tie心xin接jie地di存cun在zai的de各ge種zhong問wen題ti，需xu要yao應ying用yong合he理li的de策ce略lve給gei予yu處chu理li，以yi此ci來lai確que保bao變bian壓ya器qi的de穩wen定ding運yun行xing。1、鐵tie心xin發fa生sheng接jie地di故gu障zhang的de因yin素su在zai變bian壓ya器qi實shi際ji應ying用yong的de過guo程cheng中zhong，絕jue大da多duo數shu變bian壓ya器qi的de鐵tie心xin常chang常chang會hui通tong過guo套tao管guan引yin導dao油you箱xiang外wai麵mian來lai接jie地di，若ruo是shi鐵tie心xin由you於yu某mou種zhong因yin素su在zai某mou個ge位wei置zhi發fa生sheng多duo點dian接jie地di的de情qing況kuang，就jiu會hui產chan生sheng環huan流liu，也ye就jiu發fa生sheng了le鐵tie心xin多duo點dian接jie地di的de故gu障zhang。除chu上shang述shu因yin素su之zhi外wai，導dao致zhi鐵tie心xin發fa生sheng接jie地di故gu障zhang的de因yin素su還hai表biao現xian在zai以yi下xia四si個ge方fang麵mian：qiyi，bianyaqizaishengchanguochengzhongnanmianhuichanshengjinshuxiaokelihemaocichaochadeqingkuang，erqiebianyaqizaiweixiudeguochengzhongqineibuyekenengcancunyixiejuyoudaodianxingdewuzhi，zaicichangdezuoyongxia，daoxianwuzhihuixingchengdaodianxiaoqiao，fashengtiexinyuyouxiangbiduanjiedezhuangkuang；其二，在變壓器安裝過程中，膠粉末飛入或者濺入箱體使絕緣體的電阻大大降低，而且積累在油箱裏會構成橋路；其三，變壓器實際使用時潛油泵軸承磨損，產生的金屬粉末進入油箱，發生油箱壁與鐵心短接的情況；其(qi)四(si)，技(ji)術(shu)工(gong)作(zuo)者(zhe)在(zai)安(an)裝(zhuang)變(bian)壓(ya)器(qi)時(shi)，由(you)於(yu)粗(cu)心(xin)大(da)意(yi)導(dao)致(zhi)定(ding)位(wei)釘(ding)產(chan)生(sheng)鬆(song)動(dong)，促(cu)使(shi)鐵(tie)心(xin)夾(jia)件(jian)與(yu)係(xi)統(tong)支(zhi)板(ban)之(zhi)間(jian)的(de)間(jian)隙(xi)大(da)大(da)減(jian)小(xiao)，最(zui)終(zhong)導(dao)致(zhi)電(dian)力(li)變(bian)壓(ya)器(qi)產(chan)生(sheng)鐵(tie)心(xin)故(gu)障(zhang)。2、變bian壓ya器qi鐵tie心xin接jie地di故gu障zhang診zhen斷duan首shou先xian，變bian壓ya器qi處chu於yu停ting止zhi運yun行xing狀zhuang態tai下xia的de診zhen斷duan。通tong常chang情qing況kuang下xia，大da中zhong型xing變bian壓ya器qi必bi須xu要yao有you一yi點dian可ke靠kao接jie地di，將jiang鐵tie心xin接jie地di線xian處chu於yu不bu連lian接jie的de情qing況kuang，采cai取qu 2500V jueyuandianzulaiceshi，yicilaifenxitiexinshibushijiedi，zhenduitiexinmeiyoutongdiandebianyaqi，zaishebeibutongdiandejichushangfenxijiediwentidefangshijiaoweifanza，xuyaocaiqubianyaqiyouqisepufenxi，bingjiehebianyaqishiyanxiangmujinxingzonghepanduan；qici，bianyaqizaiyunxingzhuangtaixiatiexinjiediguzhangdezhenduan。ruoshidianlibianyaqitiexinchanshengjiediwenti，nametiexinbufenbuweiderelianghuizaiduanshijianneidadatigao，huicushijueyuantiyoudezuchengchengfenfashengbianhua，xiangguanjishugongzuozhexuyaozhezhongyanjiubianyaqideyouqixiangsepufenxi，yicilaipanduanjiediguzhang，yucitongshi，tiexinzaijiedidianzhijianhuixingchenghuanliu，jinerfashengjubuguoredeqingkuang，huichanshengzongtingchanqisulvchaochuzhengchangzhi，ruoshichanshengjiawanyuxitingzufenjiaogaoyihuoshiyiyanghuatanzuchengweifashengxianzhubianhua，jiunenggouzhengmingtiexinshifoucunzaijiedidebuliangwenti。3、鐵心故障的處理策略3.1 在zai變bian壓ya器qi停ting止zhi運yun行xing的de情qing況kuang下xia，采cai取qu電dian容rong放fang電dian衝chong擊ji法fa通tong常chang情qing況kuang下xia，在zai變bian壓ya器qi鐵tie心xin接jie地di引yin出chu線xian斷duan開kai時shi，技ji術shu工gong作zuo者zhe可ke以yi利li用yong兆zhao歐ou表biao對dui電dian容rong充chong電dian，在zai後hou續xu放fang電dian的de過guo程cheng中zhong需xu要yao測ce試shi鐵tie心xin的de絕jue緣yuan體ti電dian阻zu，若ruo是shi絕jue緣yuan體ti電dian阻zu值zhi為wei正zheng常chang，那na麼me故gu障zhang就jiu可ke以yi排pai除chu，同tong時shi也ye可ke以yi采cai取qu時shi刻ke關guan注zhu故gu障zhang點dian產chan期qi速su率lv大da小xiao、測量鐵心接地電流等方式製約故障的發展，針對不穩定的接地情況，在鐵心接地引出線中采用可調電阻，從而將控製電流控製在小於 1A 的範圍內。3.2 guzhangchixuyanshen，zhenduibianyaqikaizhantingdianjiancesuizhedianlijishudebuduanjinbu，liyongdiaozhaopanduanbianyaqitiexinjiedibuweishizuiweipubianchulifangshifangfa，weilejinkenengdijianduanbianyaqizaiwaidebaolushijian，yaoxianjiangtiexinhejiajianchuyubulianjiedezhuangtai，zhihoucainengceshikongxinluoxuanganduitiexindejueyuanshuzhi，zaijutijiancedeguochengzhong，jishurenyuanyaorenzhenquanmiandizhazhaogegejianxi、槽部是否存在螺帽和金屬碎屑，並用油亦或是氮氣清理。采取直接檢查的方式尋找接地故障時，技術工作者需要將吊罩吊開，采取 1000V 的(de)兆(zhao)歐(ou)表(biao)測(ce)試(shi)鐵(tie)心(xin)絕(jue)緣(yuan)電(dian)阻(zu)的(de)具(ju)體(ti)數(shu)值(zhi)，如(ru)果(guo)阻(zu)值(zhi)是(shi)零(ling)且(qie)鐵(tie)心(xin)夾(jia)件(jian)電(dian)阻(zu)能(neng)夠(gou)正(zheng)常(chang)使(shi)用(yong)，這(zhe)就(jiu)能(neng)夠(gou)足(zu)以(yi)證(zheng)明(ming)問(wen)題(ti)發(fa)生(sheng)在(zai)節(jie)油(you)箱(xiang)與(yu)鐵(tie)心(xin)之(zhi)間(jian)的(de)變(bian)壓(ya)器(qi)，這(zhe)是(shi)由(you)於(yu)調(tiao)出(chu)鐵(tie)心(xin)中(zhong)的(de)油(you)箱(xiang)不(bu)太(tai)容(rong)易(yi)，可(ke)以(yi)采(cai)取(qu)小(xiao)鏡(jing)片(pian)反(fan)光(guang)照(zhao)射(she)的(de)方(fang)式(shi)查(zha)找(zhao)故(gu)障(zhang)點(dian)，最(zui)終(zhong)根(gen)據(ju)具(ju)體(ti)的(de)狀(zhuang)況(kuang)排(pai)除(chu)故(gu)障(zhang)。3.3 tiexinjiediguzhangchuyudongtaiqingkuang，caiqubudiaozhaochulifangshibianyaqijishugongzuozheshouxianyaocaiqusepufenxifapanduanjiediguzhangshibushidongtaixingwenti，ruguoyinweixiangtixiamianjinshuyiwudaozhidebuliangwentizenenggouquedingshidongtaixingwenti，zheshixuyaoduibianyaqijinxingfangyou，ruguomeiyouzhazhaochujinshuyiwu，zailiyongouzhaobiaoceshijueyuantidianzuzhishilingdejichushang，zhejiuyaojishugongzuozheqiaodayouxiangdexiabu，ruguocunzaifangdianshengweizhibiandongdeqingkuang，zaiduifangdianshengfujinjinxingqiaoda，yizhiqiaodadaofangdianshengbucunzai，zuizhongceshitiexinduididejueyuanjutishuzhi，congerlaipanduanjiedibuliangwentiyoumeiyouchedidedaojiejue。4、jielundianlibianyaqichengdanzaidianlinengyuandezhuanhuanyuchuanshuguochengzhongbanyanzhezhongyaojiaose，yidanchanshengbuliangwentiyouqishijiediguzhang，jianghuigeidianlixitongdeyunxingdailaihendadeyinhuan，shenzhihuidailaiwufagujiderenshenhecaichansunshi。dianliqiyexuyaoshikeguanzhudianlibianyaqitiexinjiediguzhang，zhangwodaozhiguzhangchanshengdeyinsuyuzhenduanpaichufangfa，qieshizengqiangbianyaqiyunxingdeanquanwendingxing，baozhangdianlixitongpingwendeyunxing。
現在國產變頻器性能日趨成熟，種類繁多讓人選的眼花繚亂， 很hen多duo品pin牌pai都dou已yi經jing受shou過guo市shi場chang的de檢jian驗yan，但dan也ye有you部bu分fen品pin牌pai進jin行xing模mo仿fang作zuo假jia來lai擾rao亂luan市shi場chang，國guo產chan品pin牌pai有you一yi個ge特te點dian就jiu是shi外wai觀guan神shen似si，某mou國guo產chan品pin牌pai和he某mou進jin口kou品pin牌pai外wai觀guan相xiang似si，某mou國guo產chan品pin牌pai又you和he另ling外wai一yi個ge國guo產chan品pin牌pai外wai觀guan相xiang似si等deng等deng，這zhe就jiu讓rang人ren無wu法fa去qu看kan出chu一yi個ge品pin牌pai的de內nei在zai和he底di蘊yun，也ye容rong易yi讓rang人ren在zai選xuan擇ze時shi候hou做zuo出chu錯cuo誤wu的de判pan斷duan。這zhe就jiu需xu要yao我wo們men在zai選xuan擇ze變bian頻pin器qi的de時shi候hou要yao獨du具ju慧hui眼yan，仔zai細xi觀guan察cha變bian頻pin器qi的de外wai在zai工gong藝yi和he內nei在zai實shi力li。 變頻器的鑒別方法:bianpinqishouxiangeirendeshiwaiguanshijiaochongji，jiuheshoujiyiyang，douyouyigeyinxiang。haodebianpinqiwaiguanxinying，dujuliuxianxingdejishen，sihugengjiayouzhangli，zheyangdewaikeshejishixuyaowaixingsheji，mojukaimo，neibuyuanqijiandepaiban，zaidaopiliangshengchan，zhegechengbenjiuyijingfeichanggaole，yibanjinkoupinpaibianpinqiqiyecaihuizaizhefangmiantouruhenda。biruABB變bian頻pin器qi很hen細xi長chang，富fu士shi變bian頻pin器qi很hen寬kuan大da，西xi門men子zi變bian頻pin器qi很hen厚hou重zhong，都dou有you自zi己ji的de特te點dian。而er有you些xie國guo產chan變bian頻pin器qi品pin牌pai沒mei有you實shi力li去qu投tou入ru這zhe些xie改gai進jin，一yi眼yan望wang去qu都dou是shi方fang方fang正zheng正zheng，毫hao無wu辨bian識shi度du可ke言yan。這zhe就jiu需xu要yao我wo們men仔zai細xi觀guan察cha，外wai殼ke模mo板ban是shi哪na一yi品pin牌pai的de磨mo具ju開kai的de，看kan是shi不bu是shi淘tao汰tai的de型xing號hao，就jiu能neng分fen別bie此ci廠chang家jia的de潛qian力li。外wai形xing其qi實shi也ye不bu是shi最zui重zhong要yao的de，但dan做zuo工gong能neng看kan出chu一yi個ge品pin牌pai的de實shi力li，外wai殼ke的de材cai質zhi，阻zu燃ran值zhi等deng細xi節jie問wen題ti都dou能neng大da致zhi分fen辨bian成cheng本ben的de多duo少shao，拆chai開kai外wai殼ke，看kan裏li麵mian電dian路lu板ban布bu局ju是shi否fou合he理li，打da開kai外wai殼ke和he電dian路lu板ban步bu驟zhou是shi否fou人ren性xing化hua，有you的de變bian頻pin器qi內nei部bu怎zen麼me都dou打da不bu開kai，也ye不bu上shang螺luo絲si，你ni讓rang怎zen麼me打da開kai維wei修xiu。電dian路lu板ban做zuo工gong也ye能neng一yi眼yan看kan出chu，是shi否fou是shi機ji器qi貼tie片pian，是shi否fou有you三san防fang漆qi，電dian路lu板ban幾ji層ceng，是shi否fou有you虛xu焊han，是shi否fou有you銅tong線xian來lai回hui穿chuan插cha電dian路lu板ban中zhong，這zhe些xie都dou能neng看kan出chu一yi個ge企qi業ye在zai電dian路lu板ban設she計ji布bu局ju的de實shi力li。不bu好hao的de布bu局ju也ye會hui給gei變bian頻pin器qi帶dai來lai故gu障zhang隱yin患huan，再zai就jiu是shi看kan變bian頻pin器qi的de模mo塊kuai是shi否fou是shi進jin口kou品pin牌pai，模mo塊kuai的de電dian流liu值zhi多duo大da，這zhe些xie將jiang直zhi接jie影ying響xiang變bian頻pin器qi使shi用yong壽shou命ming，還hai有you就jiu是shi變bian頻pin器qi的de電dian容rong，看kan容rong量liang是shi否fou夠gou，看kan品pin牌pai是shi否fou是shi大da品pin牌pai，這zhe些xie也ye會hui影ying響xiang變bian頻pin器qi的de性xing能neng，很hen後hou看kan變bian頻pin器qi的de風feng道dao，風feng道dao的de設she計ji合he理li，變bian頻pin器qi的de散san熱re能neng力li就jiu能neng夠gou提ti升sheng很hen大da，反fan之zhi變bian頻pin器qi會hui容rong易yi經jing常chang出chu故gu障zhang。國guo產chan變bian頻pin器qi硬ying件jian如ru果guo差cha不bu多duo，就jiu得de考kao慮lv到dao軟ruan件jian問wen題ti，一yi般ban變bian頻pin器qi都dou是shi延yan續xu進jin口kou品pin牌pai的de軟ruan件jian來lai經jing過guo修xiu改gai，很hen後hou達da到dao要yao求qiu。但dan有you的de廠chang家jia沒mei有you源yuan代dai碼ma，無wu法fa修xiu改gai主zhu程cheng序xu裏li麵mian的de東dong西xi，那na就jiu無wu法fa提ti升sheng變bian頻pin器qi的de性xing能neng。目mu前qian國guo內nei廠chang家jia能neng具ju備bei更geng改gai變bian頻pin器qi算suan法fa的de廠chang家jia不bu是shi很hen多duo，隻zhi是shi沿yan用yong以yi前qian的de主zhu程cheng序xu，來lai加jia以yi參can數shu的de更geng改gai達da到dao很hen佳jia效xiao果guo。測ce試shi一yi個ge變bian頻pin器qi軟ruan件jian好hao壞huai最zui直zhi接jie的de辦ban法fa就jiu是shi加jia上shang負fu載zai測ce試shi，低di頻pin大da扭niu矩ju是shi考kao驗yan變bian頻pin器qi算suan法fa的de直zhi接jie有you效xiao的de方fang法fa，在zai更geng改gai好hao參can數shu之zhi後hou，將jiang變bian頻pin器qi調tiao製zhi5Hz以內，看負載電機扭矩是否減弱，
“兩票”：配電工作票、安全施工作業票基坑開挖、立杆放線等所有施工必須持票工作。臨時拉線的設置應作為安全措施列入工作票或作業票。1、工作票.............................................
德國汽車加工廠,先進！
有源電力濾波器（APF），是采用現代電力電子技術和基於高速DSP（數字信號處理器）器件的數字信號處理技術製成的新型電力諧波治理專用設備。 它(ta)由(you)指(zhi)令(ling)電(dian)流(liu)運(yun)算(suan)電(dian)路(lu)和(he)補(bu)償(chang)電(dian)流(liu)發(fa)生(sheng)電(dian)路(lu)兩(liang)個(ge)主(zhu)要(yao)部(bu)分(fen)組(zu)成(cheng)。指(zhi)令(ling)電(dian)流(liu)運(yun)算(suan)電(dian)路(lu)實(shi)時(shi)監(jian)測(ce)線(xian)路(lu)中(zhong)的(de)電(dian)流(liu)，並(bing)將(jiang)模(mo)擬(ni)電(dian)流(liu)信(xin)號(hao)轉(zhuan)換(huan)為(wei)數(shu)字(zi)信(xin)號(hao)，送(song)入(ru)高(gao)速(su)數(shu)字(zi)數(shu)字(zi)信(xin)號(hao)處(chu)理(li)器(qi)(DSP)對信號進行處理，將諧波與基波分離，並以脈寬調製（PWM）信號形式向補償電流發生電路送出驅動脈衝，驅動IGBT(絕緣柵雙極型晶體管)或IPM功gong率lv模mo塊kuai，生sheng成cheng與yu電dian網wang諧xie波bo電dian流liu幅fu值zhi相xiang等deng，極ji性xing相xiang反fan的de補bu償chang電dian流liu注zhu入ru電dian網wang，對dui諧xie波bo電dian流liu進jin行xing補bu償chang或huo抵di消xiao，主zhu動dong消xiao除chu電dian力li諧xie波bo。那na麼me，諧xie波bo是shi怎zen麼me產chan生sheng的de？諧xie波bo的de產chan生sheng是shi由you於yu正zheng弦xian波bo電dian壓ya施shi加jia在zai非fei線xian性xing負fu載zai上shang，電dian流liu就jiu變bian成cheng了le非fei正zheng弦xian波bo，非fei正zheng弦xian波bo電dian流liu在zai電dian網wang阻zu抗kang上shang產chan生sheng降jiang壓ya，會hui使shi電dian壓ya波bo形xing也ye變bian成cheng非fei正zheng弦xian波bo。如ru今jin在zai通tong訊xun、半導體、石化、化纖、鋼鐵中加熱爐和汽車製造等行業中廣泛使用的負載大部分為非線性負載，如變頻調速設備、整流器、不間斷電源、開關電源、電弧爐、焊接設備、電腦、電梯、變頻空調、jienengdenghefuyinjidengdeng。youyuzhexiefeixianxingfuzaisuochanshengdedaliangxiebodianliuyongrudianwangzhong，daozhidianyaboxingfashengjibianxianxiang。zhezhongxiebowuranduidianwangheyonghuchanshengleyanzhongdeweihai。 那麼什麼是SVG呢？SVG中文名叫做靜止無功發生器，英文描述為：Static Var Generator，簡稱為SVG。又稱高壓動態無功補償發生裝置，或靜止同步補償器。是指由自換相的電力半導體橋式變流器來進行動態無功補償的裝置。SVG是目前無功功率控製領域內的很佳方案。相對於傳統的調相機、電容器電抗器、以晶閘管控製電抗器TCR為主要代表的傳統SVC等方式，SVG有著無可比擬的優勢。那它們之間有沒有什麼聯係和區別？區別：SVG是靜態無功補償設備，是用來提高係統功率因數的；而有源濾波器（目前市麵所能見到的有源濾波器都是並聯的）是諧波補償設備，是用來消除係統內的諧波的。這是兩者最重要的區別。 聯係就是：兩者可以組合在一起使用，在補償無功功率的同時，亦可以對係統內的諧波電流進行抑製。 簡單來講（用大白話說）：APF主要是濾波功能。SVG主要是無功補償。如果有諧波，SVG需要配濾波器進行。SVG的好處是容量可以做的比較大一些。APF，一般有50A，100A，150A不等。APF對係統要求比較高。如果你係統裏麵已經有電容器的存在，那麼APF就比較容易損壞（這是經驗之談）。但是可能係統又需要無功，因此就需要比較精密計算和仿真。 說shuo到dao有you源yuan濾lv波bo器qi的de應ying用yong領ling域yu，首shou先xian要yao知zhi道dao，為wei什shen麼me要yao用yong有you源yuan濾lv波bo器qi？它ta有you什shen麼me用yong呢ne？那na好hao，大da家jia都dou知zhi道dao，有you源yuan濾lv波bo器qi是shi用yong來lai治zhi理li諧xie波bo的de，因yin此ci，它ta的de作zuo用yong就jiu是shi濾lv除chu諧xie波bo。那na為wei什shen麼me要yao治zhi理li諧xie波bo呢ne？因yin為wei諧xie波bo是shi有you危wei害hai的de，危wei害hai的de種zhong類lei有you： a.造成電纜、電動機和變壓器過熱，導致其實用壽命下降或損壞； b.損壞敏感的設備，導致生產或者實驗中斷，造成重大損失； c.引發斷路器誤動作，區域性停止事故；d..造成電容器過載或因故障而損毀；e.導致中性線上出現大電流而引發係統故障；f..誘發電網諧振；g..電網中存在的諧波將降低供電效率；h.如諧波汙染等級過高，將得不到供電部門的入網批準；再說簡單點，用一句話表示就是：APF出現在整流器、變頻器、UPS、一次電源等出現的地方。
上海地鐵9號線三期（東延伸）工程站台設計摒棄繁雜的裝飾裝修清水混凝土+管線“裸裝”呈現出返璞歸真的原始之美！在9號線三期（東延伸）運營一周年之際再帶大家來領略一下“裸裝”之美！機電管線何須隱藏？?車站公共區域采用“無吊頂裸裝修”利用BIM技術對綜合管線進行精心布置在滿足功能要求前提下做到管線布置美觀協調、簡潔大方展現了“裸裝”之美！（來源：網絡，版權歸原作者）
01變頻器變頻器是利用電力半導體器件的通斷作用將工頻電源變換為另一頻率的電能控製裝置，能實現對交流異步電機的軟起動、變頻調速、提高運轉精度、改變功率因數、過流/過壓/過載保護等功能。02PWM和PAM的不同點
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