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接(jie)(jie)地(di)(di)(di)(di)電(dian)(dian)(dian)阻(zu)表設定(ding)必須符合(he)規范才能正式(shi)開始(shi)進(jin)行接(jie)(jie)地(di)(di)(di)(di)電(dian)(dian)(dian)阻(zu)數(shu)值(zhi)的(de)測量，使(shi)用儀器測量之前，接(jie)(jie)地(di)(di)(di)(di)電(dian)(dian)(dian)阻(zu)檔次(ci)(ci)(ci)位(wei)置(zhi)(zhi)(zhi)(zhi)按(an)鈕(niu)需要旋(xuan)(xuan)轉(zhuan)(zhuan)到(dao)(dao)大檔次(ci)(ci)(ci)位(wei)置(zhi)(zhi)(zhi)(zhi)，即乘10檔次(ci)(ci)(ci)位(wei)置(zhi)(zhi)(zhi)(zhi)，調節接(jie)(jie)地(di)(di)(di)(di)電(dian)(dian)(dian)阻(zu)數(shu)值(zhi)按(an)鈕(niu)需要旋(xuan)(xuan)轉(zhuan)(zhuan)到(dao)(dao)相應的(de)位(wei)置(zhi)(zhi)(zhi)(zhi)，可(ke)(ke)以(yi)旋(xuan)(xuan)轉(zhuan)(zhuan)到(dao)(dao)6到(dao)(dao)7歐(ou)的(de)位(wei)置(zhi)(zhi)(zhi)(zhi)。接(jie)(jie)地(di)(di)(di)(di)地(di)(di)(di)(di)阻(zu)表緩慢(man)轉(zhuan)(zhuan)動(dong)(dong)接(jie)(jie)地(di)(di)(di)(di)電(dian)(dian)(dian)阻(zu)表旋(xuan)(xuan)轉(zhuan)(zhuan)手(shou)(shou)柄(bing)，如果(guo)儀表指(zhi)針(zhen)從(cong)中(zhong)間的(de)零平(ping)衡點數(shu)迅速(su)向右偏轉(zhuan)(zhuan)轉(zhuan)(zhuan)動(dong)(dong)，證明原量程檔次(ci)(ci)(ci)位(wei)置(zhi)(zhi)(zhi)(zhi)選(xuan)擇較大，可(ke)(ke)以(yi)將檔次(ci)(ci)(ci)位(wei)置(zhi)(zhi)(zhi)(zhi)移(yi)動(dong)(dong)到(dao)(dao)乘1檔次(ci)(ci)(ci)位(wei)置(zhi)(zhi)(zhi)(zhi)，如果(guo)偏轉(zhuan)(zhuan)方向和(he)之前一樣，那么可(ke)(ke)以(yi)將檔次(ci)(ci)(ci)位(wei)置(zhi)(zhi)(zhi)(zhi)旋(xuan)(xuan)轉(zhuan)(zhuan)到(dao)(dao)乘01檔次(ci)(ci)(ci)位(wei)置(zhi)(zhi)(zhi)(zhi)上。通過(guo)第(di)三個步驟進(jin)行選(xuan)擇之后，緩慢(man)轉(zhuan)(zhuan)動(dong)(dong)手(shou)(shou)柄(bing)，接(jie)(jie)地(di)(di)(di)(di)電(dian)(dian)(dian)阻(zu)表指(zhi)針(zhen)會...

按GB50062-92《電(dian)(dian)力(li)裝(zhuang)(zhuang)置(zhi)(zhi)的(de)繼電(dian)(dian)保(bao)(bao)護(hu)和(he)自動(dong)裝(zhuang)(zhuang)置(zhi)(zhi)設計規范》，對3~66kV電(dian)(dian)力(li)線路裝(zhuang)(zhuang)設：相(xiang)間短路保(bao)(bao)護(hu)、單(dan)相(xiang)接地(di)保(bao)(bao)護(hu)、過(guo)負(fu)荷(he)保(bao)(bao)護(hu)。一(yi)、帶時(shi)(shi)(shi)限過(guo)電(dian)(dian)流(liu)(liu)保(bao)(bao)護(hu)1、定時(shi)(shi)(shi)限過(guo)電(dian)(dian)流(liu)(liu)保(bao)(bao)護(hu)組成：由電(dian)(dian)磁式繼電(dian)(dian)器KC、KT、KS構成，要求操(cao)作電(dian)(dian)源在動(dong)作過(guo)程(cheng)中(zhong)電(dian)(dian)壓穩定可(ke)靠(kao)。定時(shi)(shi)(shi)限就是(shi)保(bao)(bao)護(hu)裝(zhuang)(zhuang)置(zhi)(zhi)的(de)動(dong)作時(shi)(shi)(shi)間是(shi)按整定的(de)動(dong)作時(shi)(shi)(shi)間固定不變的(de)，與(yu)故障(zhang)(zhang)電(dian)(dian)流(liu)(liu)大(da)小無關；反(fan)時(shi)(shi)(shi)限就是(shi)保(bao)(bao)護(hu)裝(zhuang)(zhuang)置(zhi)(zhi)的(de)動(dong)作時(shi)(shi)(shi)間與(yu)故障(zhang)(zhang)電(dian)(dian)流(liu)(liu)大(da)小的(de)平方(fang)成反(fan)比關系，故障(zhang)(zhang)電(dian)(dian)流(liu)(liu)越大(da)，動(dong)作時(shi)(shi)(shi)間越短（一(yi)）帶時(shi)(shi)(shi)限過(guo)電(dian)(dian)流(liu)(liu)保(bao)(bao)護(hu)裝(zhuang)(zhuang)置(zhi)(zhi)的(de)構成與(yu)動(dong)作原(yuan)理(li)原(yuan)理(li)分析：一(yi)次線路AB...

耐(nai)壓(ya)(ya)(ya)(ya)(ya)(ya)測(ce)(ce)(ce)(ce)(ce)試(shi)又稱作高(gao)壓(ya)(ya)(ya)(ya)(ya)(ya)測(ce)(ce)(ce)(ce)(ce)試(shi)或(huo)介電(dian)強度測(ce)(ce)(ce)(ce)(ce)試(shi)。耐(nai)壓(ya)(ya)(ya)(ya)(ya)(ya)測(ce)(ce)(ce)(ce)(ce)試(shi)是(shi)一種無(wu)破(po)壞性的(de)測(ce)(ce)(ce)(ce)(ce)試(shi)，它(ta)(ta)用來(lai)檢測(ce)(ce)(ce)(ce)(ce)經常發生的(de)瞬(shun)態高(gao)壓(ya)(ya)(ya)(ya)(ya)(ya)下產(chan)品的(de)絕緣能(neng)力是(shi)否合格(ge)。它(ta)(ta)在一定(ding)時間內施加高(gao)壓(ya)(ya)(ya)(ya)(ya)(ya)到(dao)被測(ce)(ce)(ce)(ce)(ce)試(shi)設(she)備以確(que)保設(she)備的(de)絕緣性能(neng)足夠強。測(ce)(ce)(ce)(ce)(ce)試(shi)電(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)，大部(bu)分的(de)安全標準允許在耐(nai)壓(ya)(ya)(ya)(ya)(ya)(ya)測(ce)(ce)(ce)(ce)(ce)試(shi)中使(shi)用交流或(huo)直流電(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)。若使(shi)用交流測(ce)(ce)(ce)(ce)(ce)試(shi)電(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)，當達到(dao)電(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)峰值(zhi)時，無(wu)論是(shi)正性還是(shi)負(fu)性峰值(zhi)時，待測(ce)(ce)(ce)(ce)(ce)絕緣體都承受大壓(ya)(ya)(ya)(ya)(ya)(ya)力。因此，如果決(jue)定(ding)選擇使(shi)用直流電(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)測(ce)(ce)(ce)(ce)(ce)試(shi)，就必須確(que)保直流測(ce)(ce)(ce)(ce)(ce)試(shi)電(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)是(shi)交流測(ce)(ce)(ce)(ce)(ce)試(shi)電(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)的(de)倍，這樣(yang)直流電(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)才可(ke)以與交流電(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)峰值(zhi)等值(zhi)。例如：1500V交流電(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)，對于(yu)...

1）電(dian)(dian)(dian)池(chi)電(dian)(dian)(dian)壓(ya)不(bu)足(zu)。電(dian)(dian)(dian)池(chi)電(dian)(dian)(dian)壓(ya)欠壓(ya)過低(di)，造成(cheng)電(dian)(dian)(dian)路不(bu)能正(zheng)常工作，所以測(ce)(ce)出的(de)讀數是不(bu)準(zhun)確(que)的(de)。2）測(ce)(ce)試線(xian)接(jie)(jie)(jie)法不(bu)正(zheng)確(que)。誤(wu)將"L"、"G"、"E"三端(duan)(duan)接(jie)(jie)(jie)線(xian)接(jie)(jie)(jie)錯，或將"G"、"L"連(lian)線(xian)"G"、"E"連(lian)線(xian)接(jie)(jie)(jie)在被(bei)(bei)測(ce)(ce)試品(pin)兩端(duan)(duan)。3）"G"端(duan)(duan)連(lian)線(xian)未接(jie)(jie)(jie)。被(bei)(bei)測(ce)(ce)試品(pin)由于受污染潮濕等(deng)因素造成(cheng)電(dian)(dian)(dian)流(liu)泄漏引起的(de)誤(wu)差，造成(cheng)測(ce)(ce)試不(bu)準(zhun)確(que)，此時必須接(jie)(jie)(jie)好(hao)"G"端(duan)(duan)連(lian)線(xian)防止泄漏電(dian)(dian)(dian)流(liu)引起誤(wu)差。4）干擾過大。如(ru)果被(bei)(bei)測(ce)(ce)試品(pin)受環境電(dian)(dian)(dian)磁干擾過大，造成(cheng)儀(yi)表讀數跳動。或指針晃動。造成(cheng)讀數不(bu)準(zhun)確(que)。5）人為讀數錯誤(wu)。在用(yong)指針式(shi)絕(jue)緣(yuan)電(dian)(dian)(dian)阻測(ce)(ce)試儀(yi)測(ce)(ce)量時...

在測容(rong)性負載阻(zu)(zu)值時，兆(zhao)(zhao)(zhao)歐表(biao)輸(shu)(shu)(shu)出(chu)(chu)短路電(dian)(dian)(dian)流大(da)小(xiao)與測量(liang)數據有什(shen)么關系(xi)，為什(shen)么?兆(zhao)(zhao)(zhao)歐表(biao)輸(shu)(shu)(shu)出(chu)(chu)短路電(dian)(dian)(dian)流的(de)(de)大(da)小(xiao)可反映(ying)出(chu)(chu)該(gai)兆(zhao)(zhao)(zhao)歐表(biao)內部輸(shu)(shu)(shu)出(chu)(chu)高壓(ya)源(yuan)內阻(zu)(zu)的(de)(de)大(da)校(xiao)當被(bei)測試品存在電(dian)(dian)(dian)容(rong)量(liang)時，在測試過程的(de)(de)開始(shi)階(jie)段，兆(zhao)(zhao)(zhao)歐表(biao)內的(de)(de)高壓(ya)源(yuan)要(yao)(yao)通過其內阻(zu)(zu)向該(gai)電(dian)(dian)(dian)容(rong)充(chong)電(dian)(dian)(dian)，并逐步(bu)將(jiang)電(dian)(dian)(dian)壓(ya)充(chong)到兆(zhao)(zhao)(zhao)歐表(biao)的(de)(de)輸(shu)(shu)(shu)出(chu)(chu)額定(ding)高壓(ya)值。兆(zhao)(zhao)(zhao)歐表(biao)輸(shu)(shu)(shu)出(chu)(chu)短路電(dian)(dian)(dian)流的(de)(de)大(da)小(xiao)可反映(ying)出(chu)(chu)該(gai)兆(zhao)(zhao)(zhao)歐表(biao)內部輸(shu)(shu)(shu)出(chu)(chu)高壓(ya)源(yuan)內阻(zu)(zu)的(de)(de)大(da)校(xiao)當被(bei)測試品存在電(dian)(dian)(dian)容(rong)量(liang)時，在測試過程的(de)(de)開始(shi)階(jie)段，兆(zhao)(zhao)(zhao)歐表(biao)內的(de)(de)高壓(ya)源(yuan)要(yao)(yao)通過其內阻(zu)(zu)向該(gai)電(dian)(dian)(dian)容(rong)充(chong)電(dian)(dian)(dian)，并逐步(bu)將(jiang)電(dian)(dian)(dian)壓(ya)充(chong)到兆(zhao)(zhao)(zhao)歐表(biao)的(de)(de)輸(shu)(shu)(shu)出(chu)(chu)額定(ding)高壓(ya)值。顯然，如果試品的(de)(de)電(dian)(dian)(dian)容(rong)量(liang)值...

電(dian)流(liu)(liu)(liu)(liu)互(hu)(hu)(hu)感器(qi)(qi)(qi)現場校驗(yan)儀(yi)是在詳細分(fen)析互(hu)(hu)(hu)感器(qi)(qi)(qi)的(de)(de)(de)數學模型(xing)的(de)(de)(de)基(ji)礎上開宣布的(de)(de)(de)互(hu)(hu)(hu)感器(qi)(qi)(qi)測驗(yan)儀(yi)，在進行互(hu)(hu)(hu)感器(qi)(qi)(qi)檢守(shou)時，不(bu)需要調壓(ya)器(qi)(qi)(qi)、大電(dian)流(liu)(liu)(liu)(liu)升流(liu)(liu)(liu)(liu)器(qi)(qi)(qi)和規范互(hu)(hu)(hu)感器(qi)(qi)(qi)及負(fu)荷箱，只需帶上電(dian)流(liu)(liu)(liu)(liu)互(hu)(hu)(hu)感器(qi)(qi)(qi)現場校驗(yan)儀(yi)就(jiu)可(ke)(ke)(ke)(ke)按(an)國(guo)家(jia)規范丈(zhang)量(liang)電(dian)流(liu)(liu)(liu)(liu)互(hu)(hu)(hu)感器(qi)(qi)(qi)的(de)(de)(de)比差(cha)和角(jiao)差(cha)，還(huan)可(ke)(ke)(ke)(ke)丈(zhang)量(liang)電(dian)流(liu)(liu)(liu)(liu)1%~120%間恣(zi)意百分(fen)比的(de)(de)(de)比差(cha)和角(jiao)差(cha)；可(ke)(ke)(ke)(ke)直接丈(zhang)量(liang)電(dian)流(liu)(liu)(liu)(liu)互(hu)(hu)(hu)感器(qi)(qi)(qi)和電(dian)壓(ya)互(hu)(hu)(hu)感器(qi)(qi)(qi)的(de)(de)(de)變比；可(ke)(ke)(ke)(ke)定性(xing)的(de)(de)(de)丈(zhang)量(liang)電(dian)壓(ya)互(hu)(hu)(hu)感器(qi)(qi)(qi)的(de)(de)(de)比差(cha)和角(jiao)差(cha)；可(ke)(ke)(ke)(ke)現場丈(zhang)量(liang)電(dian)流(liu)(liu)(liu)(liu)和電(dian)壓(ya)互(hu)(hu)(hu)感器(qi)(qi)(qi)的(de)(de)(de)實踐二次負(fu)荷，檢定特別便利。電(dian)流(liu)(liu)(liu)(liu)互(hu)(hu)(hu)感器(qi)(qi)(qi)現場校驗(yan)儀(yi)選用高精度(du)、主動(dong)線性(xing)調理的(de)(de)(de)直流(liu)(liu)(liu)(liu)和交(jiao)流(liu)(liu)(liu)(liu)電(dian)源(yuan)；高速(su)、高可(ke)(ke)(ke)(ke)靠性(xing)的(de)(de)(de)數...

根據(ju)互(hu)(hu)感(gan)(gan)器(qi)二次(ci)側的(de)(de)勵磁電(dian)流(liu)(liu)和電(dian)壓(ya)計算(suan)出(chu)的(de)(de)電(dian)流(liu)(liu)倍數（M）與允(yun)許二次(ci)負(fu)荷(he)（ZII）之間的(de)(de)5%、10%誤(wu)差(cha)(cha)曲線的(de)(de)數據(ju)中也可判斷互(hu)(hu)感(gan)(gan)器(qi)保護繞組(zu)是否合格(ge)(ge)：1）在(zai)接近理(li)(li)論(lun)電(dian)流(liu)(liu)倍數下所測量(liang)的(de)(de)實際負(fu)荷(he)大(da)于(yu)互(hu)(hu)感(gan)(gan)器(qi)銘牌(pai)上(shang)理(li)(li)論(lun)負(fu)荷(he)值，說(shuo)明(ming)該(gai)互(hu)(hu)感(gan)(gan)器(qi)合格(ge)(ge)。2）在(zai)接近理(li)(li)論(lun)負(fu)荷(he)下所測量(liang)的(de)(de)實際電(dian)流(liu)(liu)倍數大(da)于(yu)互(hu)(hu)感(gan)(gan)器(qi)銘牌(pai)上(shang)的(de)(de)理(li)(li)論(lun)電(dian)流(liu)(liu)倍數,也說(shuo)明(ming)該(gai)互(hu)(hu)感(gan)(gan)器(qi)合格(ge)(ge)如(ru)圖31數據(ju)說(shuo)明(ming)；保護用電(dian)流(liu)(liu)互(hu)(hu)感(gan)(gan)器(qi)二次(ci)負(fu)荷(he)應滿足5%誤(wu)差(cha)(cha)曲線的(de)(de)要求，只要電(dian)流(liu)(liu)互(hu)(hu)感(gan)(gan)器(qi)二次(ci)實際負(fu)荷(he)小于(yu)5%誤(wu)差(cha)(cha)曲線允(yun)許的(de)(de)負(fu)荷(he)，在(zai)額定(ding)電(dian)流(liu)(liu)倍數下，合格(ge)(ge)的(de)(de)電(dian)流(liu)(liu)互(hu)(hu)感(gan)(gan)器(qi)的(de)(de)測...

由于變(bian)(bian)壓(ya)(ya)(ya)器(qi)(qi)的(de)(de)(de)絕緣(yuan)電(dian)(dian)阻(zu)值與加(jia)壓(ya)(ya)(ya)的(de)(de)(de)時(shi)(shi)間，變(bian)(bian)壓(ya)(ya)(ya)器(qi)(qi)絕緣(yuan)的(de)(de)(de)溫(wen)度(du)和測(ce)量(liang)電(dian)(dian)壓(ya)(ya)(ya)的(de)(de)(de)大小有關(guan)，因此在(zai)試(shi)(shi)驗時(shi)(shi)必(bi)須嚴(yan)格控制(zhi)每次讀(du)取(qu)(qu)儀(yi)表讀(du)數的(de)(de)(de)時(shi)(shi)間，要在(zai)記(ji)錄儀(yi)表讀(du)數的(de)(de)(de)同(tong)時(shi)(shi)記(ji)錄自(zi)施(shi)加(jia)電(dian)(dian)壓(ya)(ya)(ya)至讀(du)取(qu)(qu)指示數據時(shi)(shi)的(de)(de)(de)時(shi)(shi)間（以(yi)秒(miao)或分為單位）。并(bing)記(ji)錄測(ce)試(shi)(shi)儀(yi)表的(de)(de)(de)額(e)定輸(shu)出電(dian)(dian)壓(ya)(ya)(ya)和變(bian)(bian)壓(ya)(ya)(ya)器(qi)(qi)油溫(wen)度(du)，決(jue)不允許輕易估計(ji)這三個(ge)參數。在(zai)進(jin)行試(shi)(shi)驗時(shi)(shi)應具備以(yi)下條件：(1)凡油浸(jin)變(bian)(bian)壓(ya)(ya)(ya)器(qi)(qi)必(bi)須充滿(man)變(bian)(bian)壓(ya)(ya)(ya)器(qi)(qi)油。(2)凡影響測(ce)量(liang)結果的(de)(de)(de)附件必(bi)須按(an)圖(tu)全部裝好。(3)測(ce)量(liang)時(shi)(shi)變(bian)(bian)壓(ya)(ya)(ya)器(qi)(qi)絕緣(yuan)的(de)(de)(de)溫(wen)度(du)應在(zai)10-40℃。用來測(ce)量(liang)絕緣(yuan)電(dian)(dian)阻(zu)的(de)(de)(de)施(shi)加(jia)電(dian)(dian)壓(ya)(ya)(ya)，不得超過(guo)外施(shi)電(dian)(dian)壓(ya)(ya)(ya)的(de)(de)(de)有效值，...

冷(leng)卻(que)(que)裝置是(shi)通過變壓器(qi)(qi)油(you)幫助繞(rao)(rao)組(zu)和(he)鐵(tie)(tie)芯(xin)(xin)散熱(re).冷(leng)卻(que)(que)裝置正常(chang)與否(fou),是(shi)變壓器(qi)(qi)正常(chang)運行(xing)(xing)的(de)重要(yao)(yao)條(tiao)件.在(zai)(zai)冷(leng)卻(que)(que)設備存在(zai)(zai)故(gu)障(zhang)或冷(leng)卻(que)(que)效(xiao)率達(da)不到設計要(yao)(yao)求時,變壓器(qi)(qi)是(shi)不宜滿負荷(he)(he)運行(xing)(xing)的(de),更不宜過負荷(he)(he)運行(xing)(xing),需(xu)要(yao)(yao)注意的(de)是(shi),在(zai)(zai)油(you)溫(wen)(wen)上(shang)升過程中,繞(rao)(rao)組(zu)和(he)鐵(tie)(tie)芯(xin)(xin)的(de)溫(wen)(wen)度上(shang)升快,而油(you)溫(wen)(wen)上(shang)升較慢.可能從表面上(shang)看油(you)溫(wen)(wen)上(shang)升不多,但鐵(tie)(tie)芯(xin)(xin)和(he)繞(rao)(rao)組(zu)的(de)溫(wen)(wen)度已經很(hen)高了,所(suo)以,在(zai)(zai)冷(leng)卻(que)(que)裝置存在(zai)(zai)故(gu)障(zhang)時,不僅要(yao)(yao)觀察油(you)溫(wen)(wen),還應注意變壓器(qi)(qi)運行(xing)(xing)的(de)其它(ta)變化,綜合判斷變壓器(qi)(qi)的(de)運行(xing)(xing)狀況(kuang).

具體(ti)來(lai)講(jiang)，電(dian)機(ji)拖動(dong)包括諸多方面(mian)的(de)內容(rong)，比如直(zhi)流電(dian)機(ji)、電(dian)機(ji)系統(tong)的(de)運動(dong)方程(cheng)以及直(zhi)流電(dian)機(ji)的(de)靜態特(te)點、動(dong)態特(te)點以及變(bian)壓器(qi)等等。我們從控(kong)(kong)制(zhi)類別方面(mian)來(lai)講(jiang)，轉速(su)開(kai)環是(shi)(shi)卸油泵電(dian)動(dong)機(ji)的(de)變(bian)頻(pin)(pin)調速(su)系統(tong)，電(dian)源變(bian)頻(pin)(pin)調速(su)系統(tong)則是(shi)(shi)利用(yong)(yong)恒壓頻(pin)(pin)度(du)比來(lai)控(kong)(kong)制(zhi)的(de)。在實(shi)際的(de)使(shi)用(yong)(yong)過程(cheng)中(zhong)，要想控(kong)(kong)制(zhi)輸(shu)出直(zhi)流電(dian)壓，主要依據的(de)是(shi)(shi)電(dian)壓。通(tong)過速(su)度(du)給(gei)(gei)定，可(ke)(ke)以獲得(de)整(zheng)個電(dian)力系統(tong)中(zhong)的(de)控(kong)(kong)制(zhi)信(xin)號(hao)，即(ji)使(shi)在是(shi)(shi)跳躍變(bian)化(hua)的(de)情(qing)況(kuang)下，進行速(su)度(du)給(gei)(gei)定，也可(ke)(ke)以對逆變(bian)器(qi)的(de)輸(shu)出電(dian)壓以及電(dian)流的(de)規律性變(bian)化(hua)進行協調和控(kong)(kong)制(zhi)。因此，我們將給(gei)(gei)定積分器(qi)給(gei)(gei)設定下來(lai)，用(yong)(yong)斜坡輸(shu)出信(xin)號(hao)...