電容電流測試儀別稱：配電網電容電流測試儀、全自動電容電流測試儀

產品簡介
青(qing)海?電(dian)(dian)(dian)容電(dian)(dian)(dian)流(liu)測(ce)(ce)(ce)試(shi)儀，是直接從(cong)PT的二次(ci)側測(ce)(ce)(ce)量配電(dian)(dian)(dian)網的電(dian)(dian)(dian)容電(dian)(dian)(dian)流(liu)，與(yu)傳(chuan)統的測(ce)(ce)(ce)試(shi)方法相比，該儀器無需(xu)和一次(ci)側打交道，因而不存在試(shi)驗(yan)的危險性，只需(xu)將測(ce)(ce)(ce)量線接于PT的開(kai)口三角端就可以測(ce)(ce)(ce)量出電(dian)(dian)(dian)容電(dian)(dian)(dian)流(liu)的數據。

電(dian)容電(dian)流測試儀(yi)由于從PT開口三角處注入的(de)(de)(de)是(shi)微弱的(de)(de)(de)異(yi)頻測試信號，不會對繼電(dian)保護和PT本身產生任何影響，又避開了50Hz的(de)(de)(de)工頻干(gan)擾信號，同時(shi)測試儀(yi)的(de)(de)(de)輸出端可以耐受100V的(de)(de)(de)交流電(dian)壓，若(ruo)測量時(shi)系(xi)統有單相接(jie)地故(gu)障(zhang)發生，亦不會損壞PT和測試儀(yi)，因而(er)無需做特別的(de)(de)(de)安全(quan)措施。

用途特點
適用(yong)配網(wang)電(dian)壓(ya)等級:6kV、10kV和35kV中壓(ya)配電(dian)網(wang)中性點不接(jie)地系統。

目前，我國(guo)配(pei)電(dian)(dian)(dian)(dian)(dian)(dian)系統(tong)(tong)的(de)(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)源中性點一般是不直接(jie)(jie)(jie)(jie)(jie)(jie)接(jie)(jie)(jie)(jie)(jie)(jie)地(di)(di)的(de)(de)(de)(de)(de)(de)(de)，所(suo)以當(dang)線(xian)(xian)路(lu)單相接(jie)(jie)(jie)(jie)(jie)(jie)地(di)(di)時流(liu)(liu)過(guo)故(gu)障(zhang)點的(de)(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)實際是線(xian)(xian)路(lu)對地(di)(di)電(dian)(dian)(dian)(dian)(dian)(dian)容產生的(de)(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)容電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)。據(ju)統(tong)(tong)計，配(pei)電(dian)(dian)(dian)(dian)(dian)(dian)網(wang)的(de)(de)(de)(de)(de)(de)(de)故(gu)障(zhang)很大程度是由于(yu)線(xian)(xian)路(lu)單相接(jie)(jie)(jie)(jie)(jie)(jie)地(di)(di)時電(dian)(dian)(dian)(dian)(dian)(dian)容過(guo)大而無法自行息(xi)弧(hu)引起的(de)(de)(de)(de)(de)(de)(de)。因(yin)此，我國(guo)的(de)(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)力規(gui)程規(gui)定當(dang):3-10KV不直接(jie)(jie)(jie)(jie)(jie)(jie)連接(jie)(jie)(jie)(jie)(jie)(jie)發電(dian)(dian)(dian)(dian)(dian)(dian)機的(de)(de)(de)(de)(de)(de)(de)系統(tong)(tong)和35、66KV系統(tong)(tong)，當(dang)單相接(jie)(jie)(jie)(jie)(jie)(jie)地(di)(di)電(dian)(dian)(dian)(dian)(dian)(dian)容電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)不超過(guo)下(xia)列數值時，應采(cai)用(yong)不接(jie)(jie)(jie)(jie)(jie)(jie)地(di)(di)方式;當(dang)超過(guo)下(xia)列數值又需(xu)要在接(jie)(jie)(jie)(jie)(jie)(jie)地(di)(di)故(gu)障(zhang)條件下(xia)運行時，應采(cai)用(yong)消弧(hu)線(xian)(xian)圈接(jie)(jie)(jie)(jie)(jie)(jie)地(di)(di)方式。(1)3-10KV鋼(gang)筋混(hun)凝土貨金屬桿塔的(de)(de)(de)(de)(de)(de)(de)架空(kong)線(xian)(xian)路(lu)構成的(de)(de)(de)(de)(de)(de)(de)系統(tong)(tong)和所(suo)有(you)35、66KV系統(tong)(tong)，10A;(2)3-10KV非(fei)鋼(gang)筋混(hun)凝土和金屬桿塔的(de)(de)(de)(de)(de)(de)(de)架空(kong)線(xian)(xian)路(lu)構成的(de)(de)(de)(de)(de)(de)(de)系統(tong)(tong)，當(dang)電(dian)(dian)(dian)(dian)(dian)(dian)壓為:1)3KV和6KV時，30A;2)10KV時，20A;3)3-10KV電(dian)(dian)(dian)(dian)(dian)(dian)纜線(xian)(xian)路(lu)構成的(de)(de)(de)(de)(de)(de)(de)系統(tong)(tong)，30A。應裝設消弧(hu)線(xian)(xian)圈以補(bu)償電(dian)(dian)(dian)(dian)(dian)(dian)容電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)，這就要求(qiu)對配(pei)網(wang)的(de)(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)容電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)進行測量以做決定。

另外(wai)，配(pei)(pei)(pei)電(dian)網(wang)的對地(di)(di)電(dian)容(rong)(rong)和PT的參數配(pei)(pei)(pei)合會(hui)產生(sheng)PT鐵(tie)磁諧振(zhen)過電(dian)壓(ya)，為了驗證該配(pei)(pei)(pei)電(dian)系統是(shi)否(fou)會(hui)發生(sheng)PT諧振(zhen)及(ji)發生(sheng)什么(me)性質的諧振(zhen)，也必(bi)須準確測量配(pei)(pei)(pei)電(dian)網(wang)的對地(di)(di)電(dian)容(rong)(rong)值。傳統的測量配(pei)(pei)(pei)網(wang)電(dian)容(rong)(rong)電(dian)流的方法(fa)有單相金屬(shu)接(jie)地(di)(di)的直(zhi)接(jie)法(fa)、外(wai)加電(dian)容(rong)(rong)間接(jie)測量法(fa)等，這些(xie)方法(fa)都要接(jie)觸(chu)到一次設備，因而存在試驗危險、操作(zuo)繁雜(za)，工作(zuo)效(xiao)率低等缺點(dian)。

電(dian)(dian)容電(dian)(dian)流測(ce)(ce)試(shi)(shi)儀(yi)(yi)直接(jie)(jie)從PT的(de)(de)(de)(de)二次(ci)側測(ce)(ce)量配電(dian)(dian)網的(de)(de)(de)(de)電(dian)(dian)容電(dian)(dian)流，無需(xu)做繁雜的(de)(de)(de)(de)安(an)全(quan)措施和(he)等待冗長的(de)(de)(de)(de)調度(du)(du)命令，只需(xu)將測(ce)(ce)量線(xian)接(jie)(jie)于(yu)(yu)PT的(de)(de)(de)(de)開(kai)口(kou)(kou)三角端就可(ke)以(yi)測(ce)(ce)量出(chu)電(dian)(dian)容電(dian)(dian)流的(de)(de)(de)(de)數據。由于(yu)(yu)從PT開(kai)口(kou)(kou)三角處注入的(de)(de)(de)(de)是微弱(ruo)的(de)(de)(de)(de)異頻測(ce)(ce)試(shi)(shi)信(xin)號(hao)，所以(yi)既不會對繼電(dian)(dian)保護和(he)PT本(ben)身(shen)產生任何影響(xiang)，又(you)避開(kai)了50Hz的(de)(de)(de)(de)工頻干擾信(xin)號(hao)，同時(shi)測(ce)(ce)試(shi)(shi)儀(yi)(yi)的(de)(de)(de)(de)輸出(chu)端可(ke)以(yi)耐受100V的(de)(de)(de)(de)交流電(dian)(dian)壓(ya)，若(ruo)測(ce)(ce)量時(shi)系統有單相接(jie)(jie)地故障發生，亦不會損(sun)壞PT和(he)測(ce)(ce)試(shi)(shi)儀(yi)(yi)，因而無需(xu)做特別的(de)(de)(de)(de)安(an)全(quan)措施使這項工作變得安(an)全(quan)、簡(jian)單、快捷(jie)，且測(ce)(ce)試(shi)(shi)結果(guo)準確、穩定、可(ke)靠(kao)。該測(ce)(ce)試(shi)(shi)儀(yi)(yi)采用大(da)屏幕液晶顯示，中文菜單，操作非(fei)常簡(jian)便，且體積小、重量輕，便于(yu)(yu)攜帶(dai)進行戶外作業，接(jie)(jie)線(xian)簡(jian)單，測(ce)(ce)試(shi)(shi)速度(du)(du)快，數據準確性高，大(da)大(da)減輕了試(shi)(shi)驗(yan)人(ren)員的(de)(de)(de)(de)勞(lao)動強(qiang)度(du)(du)，提高了工作效(xiao)率。

工作原理
是從PT開口三角(jiao)來測(ce)量電容電流的，其測(ce)量原理如(ru)圖:

從PT開口(kou)三角L，N注入一(yi)(yi)個異頻(pin)(pin)電(dian)(dian)流(liu)(liu)(liu)(非50Hz交流(liu)(liu)(liu)電(dian)(dian)流(liu)(liu)(liu)，為了避開工頻(pin)(pin)電(dian)(dian)流(liu)(liu)(liu)的(de)(de)干(gan)擾)，這(zhe)樣在PT高壓側(ce)就感(gan)應到一(yi)(yi)個按變比減小(xiao)的(de)(de)電(dian)(dian)流(liu)(liu)(liu)，此電(dian)(dian)流(liu)(liu)(liu)為零序電(dian)(dian)流(liu)(liu)(liu)，其在三相的(de)(de)大小(xiao)和(he)方向(xiang)相同，因此他在電(dian)(dian)源側(ce)和(he)負荷(he)側(ce)均不能(neng)流(liu)(liu)(liu)通，只能(neng)通過PT和(he)對(dui)地電(dian)(dian)容形(xing)成回路(lu)，這(zhe)樣就可以(yi)根據簡化了的(de)(de)物理(li)模型建(jian)立相應的(de)(de)數學(xue)運算，通過檢(jian)測信號(hao)就可以(yi)測量出三相對(dui)地電(dian)(dian)容3Co,在根據公式就可以(yi)算出系統的(de)(de)電(dian)(dian)容電(dian)(dian)流(liu)(liu)(liu)。