電容電流測試儀概述

目前(qian)，我國(guo)電(dian)(dian)(dian)(dian)(dian)力系(xi)統(tong)(tong)(tong)的(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)源中性點一般是(shi)不直接接地(di)的(de)(de)(de)(de)，所以當線路單相接地(di)時(shi)流(liu)(liu)過(guo)故障點的(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)實際是(shi)線路對地(di)電(dian)(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)產生的(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)。據統(tong)(tong)(tong)計(ji)，電(dian)(dian)(dian)(dian)(dian)力系(xi)統(tong)(tong)(tong)的(de)(de)(de)(de)故障很(hen)大(da)(da)程度(du)是(shi)由(you)于(yu)線路單相接地(di)時(shi)電(dian)(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)過(guo)大(da)(da)導(dao)致(zhi)起弧且電(dian)(dian)(dian)(dian)(dian)弧無法自行熄弧引起的(de)(de)(de)(de)。因此，我國(guo)的(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)力規(gui)程規(gui)定當10kV和35kV系(xi)統(tong)(tong)(tong)電(dian)(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)分別大(da)(da)于(yu)30A和10A時(shi)，應裝設消弧線圈以補(bu)償電(dian)(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)，這就要求對的(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)進行測(ce)量以做決定。另外(wai)，電(dian)(dian)(dian)(dian)(dian)力系(xi)統(tong)(tong)(tong)的(de)(de)(de)(de)對地(di)電(dian)(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)和PT的(de)(de)(de)(de)參數配合會產生PT鐵磁(ci)諧(xie)振過(guo)電(dian)(dian)(dian)(dian)(dian)壓(ya)，為(wei)了驗(yan)證該配電(dian)(dian)(dian)(dian)(dian)系(xi)統(tong)(tong)(tong)是(shi)否會發生PT諧(xie)振及發生什么性質的(de)(de)(de)(de)諧(xie)振，也(ye)必(bi)須準確測(ce)量電(dian)(dian)(dian)(dian)(dian)力系(xi)統(tong)(tong)(tong)的(de)(de)(de)(de)對地(di)電(dian)(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)值(zhi)。

傳統的(de)測(ce)(ce)量(liang)(liang)電(dian)容(rong)電(dian)流的(de)方法(fa)(fa)(fa)有單(dan)相(xiang)金屬接地(di)的(de)直(zhi)接法(fa)(fa)(fa)、外加電(dian)容(rong)間(jian)接測(ce)(ce)量(liang)(liang)法(fa)(fa)(fa)等，這些方法(fa)(fa)(fa)都要接觸(chu)到一次設備，因(yin)而(er)存在試(shi)驗危(wei)險、操作(zuo)繁(fan)(fan)雜，工(gong)(gong)作(zuo)效率低等缺點。進(jin)而(er)出現了(le)(le)在PT二次側注入信(xin)號法(fa)(fa)(fa)測(ce)(ce)量(liang)(liang)電(dian)網(wang)電(dian)容(rong)電(dian)流；與傳統測(ce)(ce)量(liang)(liang)方法(fa)(fa)(fa)相(xiang)比，該方法(fa)(fa)(fa)測(ce)(ce)量(liang)(liang)過(guo)程中，測(ce)(ce)試(shi)儀無需和(he)一次側直(zhi)接相(xiang)連，因(yin)而(er)試(shi)驗不存在危(wei)險性，無需做繁(fan)(fan)雜的(de)安全工(gong)(gong)作(zuo)和(he)等待(dai)冗長的(de)調度命令(ling)，只需將測(ce)(ce)量(liang)(liang)線接于(yu)PT的(de)開(kai)口三(san)角(jiao)端子(zi)就可以測(ce)(ce)量(liang)(liang)出電(dian)容(rong)電(dian)流的(de)數(shu)據。從PT開(kai)口三(san)角(jiao)處注入的(de)是微弱的(de)異頻(pin)測(ce)(ce)試(shi)信(xin)號，所以既不會對(dui)繼電(dian)保護和(he)PT本身產生任何影(ying)響(xiang)，又避開(kai)了(le)(le)50Hz的(de)工(gong)(gong)頻(pin)干擾(rao)信(xin)號。

采(cai)用全(quan)新硬件結構和速(su)度更(geng)快的ARM處(chu)理器及AD轉換器，內(nei)置(zhi)全(quan)新的全(quan)數(shu)字變頻逆變電源(yuan)，效(xiao)率(lv)高、發(fa)熱量(liang)(liang)小(xiao)、體積(ji)小(xiao)、重(zhong)量(liang)(liang)輕，更(geng)加便于(yu)攜帶和現(xian)場(chang)測(ce)試。在任何(he)時刻（包括測(ce)量(liang)(liang)過(guo)(guo)程(cheng)(cheng)中(zhong)）都可(ke)準確測(ce)量(liang)(liang)零(ling)序3U0電壓(ya)，從而便于(yu)用戶判斷系(xi)統工作(zuo)狀態；并且在測(ce)試過(guo)(guo)程(cheng)(cheng)中(zhong)，如(ru)果零(ling)序3U0電壓(ya)過(guo)(guo)高可(ke)自動(dong)停(ting)止測(ce)量(liang)(liang)過(guo)(guo)程(cheng)(cheng)。

該測(ce)試(shi)儀采(cai)用工業彩色液晶屏（強(qiang)光下可讀）、中(zhong)文菜單(dan)、人機交互更加友好，并且具備U盤(pan)存儲和數據打印(yin)等功能。接線簡單(dan)、測(ce)試(shi)速度(du)快、測(ce)試(shi)穩定性和數據準確性高(gao)，大大減(jian)輕了(le)試(shi)驗人員的勞動強(qiang)度(du)，提高(gao)了(le)工作效率。

電容電流測試儀3PT-4PT功能及特點 

1  測量范圍(wei)更寬，測試速(su)度更快。

2  支持3PT連(lian)接(jie)方(fang)式(shi)、兩種4PT連(lian)接(jie)方(fang)式(shi)、1PT連(lian)接(jie)方(fang)式(shi)現場電容電流測量。

3 工業級彩色液晶顯示屏，分辨率(lv)320×240點陣，強光(guang)下(xia)可讀。

4  人機交互界面更加友好：

(1)對于一些重(zhong)要(yao)的操作及參數設置，顯示(shi)其提示(shi)信息和幫助(zhu)說明。

(2)測量(liang)結(jie)果(guo)及相關參數顯示和打印更加詳細，便(bian)于用戶日(ri)后分析。

(3)選擇PT連(lian)接(jie)方式(shi)(shi)時，可(ke)顯示各種PT連(lian)接(jie)方式(shi)(shi)下的接(jie)線原理圖，便于用戶判別(bie)現(xian)場PT連(lian)接(jie)方式(shi)(shi)及測試線連(lian)接(jie)位(wei)置。

(4)屏(ping)幕(mu)頂部狀態欄實時顯(xian)示(shi)(shi)優盤插入狀態，對未(wei)連(lian)接的(de)設備(bei)進行操作(zuo)時，顯(xian)示(shi)(shi)相應(ying)的(de)未(wei)連(lian)接提示(shi)(shi)信息(xi)。

5  實(shi)時測量和(he)顯示零序(xu)3U0電(dian)壓(ya)(ya)值，便(bian)于用(yong)戶判斷系(xi)統工作(zuo)狀態；并且，在測量工程中如(ru)果(guo)發現零序(xu)3U0電(dian)壓(ya)(ya)過高，可自動停止(zhi)測量過程。

6  具備多(duo)重(zhong)零序3U0過壓(ya)(ya)保護電路，測(ce)試儀輸出端可耐(nai)受AC100V 50HZ電壓(ya)(ya)而不損壞。

7  內置全(quan)數字變頻逆(ni)變電源，具有(you)輸出頻率準確、輸出電流(liu)可調、輸出效率高(gao)、發熱(re)量小、體積小、重量輕(qing)、長時間工作穩定等特點。

8  具備輸出短(duan)路保護功能(neng)。

9  具備實時(shi)時(shi)鐘，可實時(shi)顯(xian)示當前時(shi)間和日期(qi)；測(ce)量(liang)結(jie)果包括測(ce)量(liang)日期(qi)及時(shi)間。

10測(ce)量(liang)數據存(cun)(cun)(cun)儲(chu)(chu)方式(shi)分(fen)為本機存(cun)(cun)(cun)儲(chu)(chu)和(he)優(you)(you)盤(pan)存(cun)(cun)(cun)儲(chu)(chu)，其中本機存(cun)(cun)(cun)儲(chu)(chu)可存(cun)(cun)(cun)儲(chu)(chu)測(ce)量(liang)數據150條(tiao)，并且本機存(cun)(cun)(cun)儲(chu)(chu)可轉存(cun)(cun)(cun)至優(you)(you)盤(pan)；優(you)(you)盤(pan)存(cun)(cun)(cun)儲(chu)(chu)數據格式(shi)為Word格式(shi)，可直接(jie)在電腦(nao)上編(bian)輯(ji)打印。

11熱(re)敏打(da)印機(ji)打(da)印功(gong)能，快速、無聲。

12體積(ji)小、重量(liang)輕，方便攜帶使用。

電容電流測試儀3PT-4PT技術指標