目前,我国配电系统的电源中性点一般是不直接接地的,所以当线路单相接地时流过故障点的电流实际是线路对地电容产生的电容电流。
据(ju)统计,配(pei)电(dian)网的(de)故障很大(da)程度是由于线路单相接(jie)地(di)时(shi)电(dian)容(rong)(rong)过大(da)而无法(fa)自(zi)行息(xi)弧引起的(de)。因此(ci),我国的(de)电(dian)力规(gui)程规(gui)定(ding)当(dang)10kV和35kV系(xi)统电(dian)容(rong)(rong)电(dian)流分别(bie)大(da)于30A和10A时(shi),应装(zhuang)
全自动电(dian)(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)电(dian)(dian)(dian)(dian)(dian)流(liu)(liu)测(ce)试仪、微(wei)机型电(dian)(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)电(dian)(dian)(dian)(dian)(dian)流(liu)(liu)测(ce)试仪、配(pei)(pei)电(dian)(dian)(dian)(dian)(dian)网(wang)电(dian)(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)电(dian)(dian)(dian)(dian)(dian)流(liu)(liu)测(ce)量仪、配(pei)(pei)电(dian)(dian)(dian)(dian)(dian)网(wang)电(dian)(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)电(dian)(dian)(dian)(dian)(dian)流(liu)(liu)测(ce)试仪、配(pei)(pei)电(dian)(dian)(dian)(dian)(dian)网(wang)电(dian)(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)电(dian)(dian)(dian)(dian)(dian)流(liu)(liu)测(ce)试系统(tong)、配(pei)(pei)电(dian)(dian)(dian)(dian)(dian)网(wang)微(wei)机型电(dian)(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)电(dian)(dian)(dian)(dian)(dian)流(liu)(liu)测(ce)试仪
该产品针对传统的电容电流测量方法安全性差、操作及接线复杂等缺点,提出一种全新的测试方法,使其无需触及或操作一次设备,仅是通过电压互感器的二次辅助线圈做简单的连线,即可安全、迅速、准确地完成该系统对地电容电流的测量。
产品概述:传统的测量配网电容电流的方法有单相金属接地的直接法、外加电容间接测量法等,这些方法都要接触到一次设备,因而存在试验危险、操作繁杂,工作效率低等缺点。BY-2811型配网电容电流测试仪。
该(gai)新型(xing)智能(neng)化(hua)测(ce)试仪直接(jie)从PT的(de)二次侧测(ce)量配电(dian)网(wang)的(de)电(dian)容电(dian)流(liu),与(yu)传统的(de)测(ce)试方法相比,该(gai)仪器无需和一次侧打交(jiao)道,因而不存在(zai)试验的(de)危险性,无需做(zuo)繁(fan)杂的(de)安全(quan)措施(shi)和等待冗长(zhang)的(de)调度命令(ling),只需将测(ce)量线接(jie)于PT的(de)开口三(san)角端就可(ke)以测(ce)量出电(dian)容电(dian)流(liu)的(de)数据(ju)
由于(yu)从PT开(kai)口三角处注入的(de)是微弱的(de)异频测(ce)试信号,所以既不会对继电保护和PT本身产生任何(he)影响,又避开(kai)了50Hz的(de)工(gong)频干(gan)扰信号,同时测(ce)试仪的(de)输出端可(ke)以耐受100V的(de)交(jiao)流电压,若测(ce)量时系统(tong)有单相接(jie)地故(gu)障发生,亦不会损坏PT和测(ce)试仪,因而(er)无需做特别的(de)安全措施,使这项工(gong)作变得安全、简单、快捷,且测(ce)试结果准确、稳定、可(ke)靠。
该测试仪采用大屏幕(mu)液晶显示,中文菜(cai)单,操作(zuo)非(fei)常简便(bian),且体积小、重量轻,便(bian)于携带进行(xing)户(hu)外作(zuo)业,接线简单,测试速度快,数据(ju)准(zhun)确(que)性(xing)高(gao),大大减轻了试验人员的劳动强度,提(ti)高(gao)了工作(zuo)效率。
BY-2803配电网电容电流测试仪价格技术指标:
适用范围(wei):6kV~10kV系统
测量(liang)范围:0~500A;0~250µF
测(ce)量精度:±5%(电容(rong)电流在10A~500A时)
±1A(电(dian)容电(dian)流<10A时)
供电电源:AC220V±10% 电源频率:50Hz±1%
环境温度:0℃~45℃ 相对湿度:≤90%
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