一、儀器(qi)HTDRDL配電網電容電流測試儀的用途及(ji)特點

目前，我(wo)國(guo)配(pei)(pei)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)系統的(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)中性點一(yi)般是不直接(jie)(jie)接(jie)(jie)地(di)(di)(di)的(de)(de)(de)，所以當(dang)線(xian)(xian)路單相接(jie)(jie)地(di)(di)(di)時流(liu)(liu)(liu)過(guo)故(gu)障(zhang)點的(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)實(shi)際(ji)是線(xian)(xian)路對(dui)地(di)(di)(di)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)容產(chan)生的(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)容電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)。據統計(ji)，配(pei)(pei)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)網的(de)(de)(de)故(gu)障(zhang)很大程度是由(you)于(yu)線(xian)(xian)路單相接(jie)(jie)地(di)(di)(di)時電(dian)(dian)(dian)(dian)(dian)(dian)(dian)容過(guo)大而(er)無法(fa)(fa)自行(xing)熄弧(hu)引起的(de)(de)(de)。因此，我(wo)國(guo)的(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)力規程規定(ding)當(dang)10kV和35kV系統電(dian)(dian)(dian)(dian)(dian)(dian)(dian)容電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)分別大于(yu)30A和10A時，應裝設消弧(hu)線(xian)(xian)圈以補償電(dian)(dian)(dian)(dian)(dian)(dian)(dian)容電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)，這(zhe)就要求(qiu)對(dui)配(pei)(pei)網的(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)容電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)進(jin)行(xing)測量(liang)以做決定(ding)。另外，配(pei)(pei)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)網的(de)(de)(de)對(dui)地(di)(di)(di)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)容和PT的(de)(de)(de)參(can)數配(pei)(pei)合會產(chan)生PT鐵磁(ci)諧(xie)振(zhen)過(guo)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓，為了驗證該配(pei)(pei)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)系統是否會發(fa)生PT諧(xie)振(zhen)及發(fa)生什么性質的(de)(de)(de)諧(xie)振(zhen)，也必須準確測量(liang)配(pei)(pei)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)網的(de)(de)(de)對(dui)地(di)(di)(di)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)容值。傳統的(de)(de)(de)測量(liang)配(pei)(pei)網電(dian)(dian)(dian)(dian)(dian)(dian)(dian)容電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)的(de)(de)(de)方(fang)法(fa)(fa)有單相金屬接(jie)(jie)地(di)(di)(di)的(de)(de)(de)直接(jie)(jie)法(fa)(fa)、外加(jia)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)容間接(jie)(jie)測量(liang)法(fa)(fa)等，這(zhe)些方(fang)法(fa)(fa)都(dou)要接(jie)(jie)觸(chu)到一(yi)次設備，因而(er)存在試驗危險、操作繁(fan)雜，工作效(xiao)率低等缺點。

為解(jie)決這些問題(ti)，我(wo)公司與大專院(yuan)校及試(shi)驗研究(jiu)院(yuan)共同潛心研制，開發出本HTDRDL配電網電容電流測試儀。該新型(xing)智能化(hua)測(ce)(ce)試(shi)(shi)(shi)儀(yi)直接從PT的(de)(de)(de)(de)二次(ci)側測(ce)(ce)量配電(dian)網的(de)(de)(de)(de)電(dian)容電(dian)流(liu)，與傳統(tong)的(de)(de)(de)(de)測(ce)(ce)試(shi)(shi)(shi)方法相比，該儀(yi)器無(wu)需(xu)和一次(ci)側直接相連，因而試(shi)(shi)(shi)驗不(bu)存在危險性，無(wu)需(xu)做(zuo)繁雜的(de)(de)(de)(de)安(an)全工(gong)作和等待冗長的(de)(de)(de)(de)調度命令(ling)，只需(xu)將測(ce)(ce)量線(xian)接于(yu)PT的(de)(de)(de)(de)開(kai)口三(san)(san)角(jiao)端(duan)就(jiu)可以(yi)測(ce)(ce)量出電(dian)容電(dian)流(liu)的(de)(de)(de)(de)數(shu)據(ju)。由于(yu)從PT開(kai)口三(san)(san)角(jiao)處注入的(de)(de)(de)(de)是微弱(ruo)的(de)(de)(de)(de)異(yi)頻(pin)測(ce)(ce)試(shi)(shi)(shi)信號(hao)，所以(yi)既(ji)不(bu)會(hui)對繼電(dian)保護和PT本身(shen)產(chan)生任何影響(xiang)，又避開(kai)了50Hz的(de)(de)(de)(de)工(gong)頻(pin)干擾信號(hao)，同(tong)時(shi)測(ce)(ce)試(shi)(shi)(shi)儀(yi)的(de)(de)(de)(de)輸(shu)出端(duan)可以(yi)耐受100V的(de)(de)(de)(de)交(jiao)流(liu)電(dian)壓(ya)，若測(ce)(ce)量時(shi)系統(tong)有單相接地故障發生，亦(yi)不(bu)會(hui)損壞(huai)PT和測(ce)(ce)試(shi)(shi)(shi)儀(yi)，因而無(wu)需(xu)做(zuo)特別的(de)(de)(de)(de)安(an)全措施，使(shi)這項工作變得安全(quan)、簡(jian)單、快捷(jie)，且測試結果準確、穩定、可靠。

HTDRDL測試(shi)儀采用大屏(ping)幕液晶(jing)顯示，中文(wen)菜單，操作非(fei)常簡便，且體積小、重量輕(qing)(qing)，便于攜帶進行戶外作業，接線簡單，測試(shi)速度快，數據準確性高，大大減(jian)輕(qing)(qing)了試(shi)驗(yan)人員的勞(lao)動強度，提高了工作效率。

二、HTDRDL主要技術指標(biao)及使用(yong)條件

1)       電(dian)容(rong)電(dian)流測(ce)量(liang)范圍(wei)：1A～250A   0.3μF～125μF

2)       測(ce)量誤差：±（讀數×5%）

3)       工作溫度：-20℃～50℃

4)       工作濕度(du)：≤90%不結露(lu)

5)       工作電(dian)源：AC 220V±10%    50Hz±10%

6)        外(wai)行(xing)尺(chi)寸：350mm×200mm×150mm

7)        儀器重(zhong)量：2.5kg

8)        電壓等級：1KV、3KV、6KV、6.3KV、10KV、20KV、35KV、66KV。