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高压实验中为甚么要夸大在高压侧丈量

2013-02-18 20:13:15      点击:

丈(zhang)(zhang)量(liang)(liang)(liang)交换(huan)高压(ya)的(de)(de)方式(shi)分两类(lei),一类(lei)是在(zai)高压(ya)侧间接(jie)丈(zhang)(zhang)量(liang)(liang)(liang);一类(lei)是在(zai)高压(ya)测间接(jie)丈(zhang)(zhang)量(liang)(liang)(liang);对普通(tong)的(de)(de)装(zhuang)备(如瓷(ci)绝(jue)缘、开关装(zhuang)备和绝(jue)缘东西等(deng))能够在(zai)高压(ya)侧丈(zhang)(zhang)量(liang)(liang)(liang);而对一些主要的(de)(de)装(zhuang)备,出格是容量(liang)(liang)(liang)较大的(de)(de)装(zhuang)备停止耐压(ya)实验时,必须(xu)在(zai)高压(ya)侧停止电(dian)压(ya)丈(zhang)(zhang)量(liang)(liang)(liang),不然会引发很大的(de)(de)偏差。

1、空载时(shi),高压(ya)侧电(dian)压(ya)乘以变(bian)比,与高压(ya)侧电(dian)压(ya)的实测成果分歧。

2、负载时(shi),高(gao)压(ya)(ya)侧电压(ya)(ya)乘以变比,低(di)于高(gao)压(ya)(ya)侧电压(ya)(ya)的(de)实测值。

产生(sheng)这类景(jing)象(xiang)的缘由(you)是电(dian)(dian)(dian)容升景(jing)象(xiang),被(bei)实(shi)验装备的实(shi)验电(dian)(dian)(dian)压必(bi)然时,若被(bei)试装备电(dian)(dian)(dian)容量越大,则电(dian)(dian)(dian)压降(jiang)低越多。

武汉(han)越(yue)超电力主(zhu)动化无(wu)限(xian)义务(wu)公(gong)司(si)FRC系列数字高压(ya)(ya)(ya)表(biao)(高压(ya)(ya)(ya)分压(ya)(ya)(ya)器)

用(yong)于精确丈量(liang)工频交换高电压(ya)和直流高电压(ya)。

FRC系列数字高压表由高压丈量局部和高压显现仪表组成。任务时高压局部和高压仪表分隔,任务宁静靠得住。量程50KV----300KV,特别(bie)请求可定制。

容升(sheng)效应

仪器外部升压变压器(L)和试品电(dian)容(C),构成了一个LC回(hui)(hui)路(lu),回(hui)(hui)路(lu)内(nei)电(dian)压会举高,这(zhei)类景(jing)象便是容升景(jing)象。

仪器外部升压(L)和试品电容(C),构(gou)成了一个LC回路,回路内电压会(hui)举(ju)高(gao),降低水平(ping)与变压器的短路阻抗成反比,普通降低的规模约为4%~30%。这便是容升效应。因为容升效应形(xing)成(cheng)(cheng)回(hui)路电(dian)(dian)(dian)压(ya)(ya)举高,就使试品的耐受电(dian)(dian)(dian)压(ya)(ya)大于(yu)仪器(qi)(qi)现实输入(ru)电(dian)(dian)(dian)压(ya)(ya),而(er)仪器(qi)(qi)上的电(dian)(dian)(dian)压(ya)(ya)表却反映不出,易形(xing)成(cheng)(cheng)绝(jue)缘击穿或实验成(cheng)(cheng)果(guo)不准(zhun)确。为防止丈(zhang)量(liang)(liang)偏差形(xing)成(cheng)(cheng)的误(wu)判(pan),实验电(dian)(dian)(dian)容较大的被试品,应间接(jie)丈(zhang)量(liang)(liang)高压(ya)(ya)侧的电(dian)(dian)(dian)压(ya)(ya)。