怎样进行工频耐压测试

电缆耐(nai)(nai)压试(shi)验(yan)是(shi)交流耐(nai)(nai)压试(shi)验(yan)的(de)一种，又称工频耐(nai)(nai)压试(shi)验(yan)。

1.测试耗材

试(shi)(shi)验(yan)对象(xiang)端子部分(fen)的长度(du)和端子头的制(zhi)作方法(fa)必须保(bao)证在(zai)电(dian)缆(lan)耐压试(shi)(shi)验(yan)规定(ding)的电(dian)压下不(bu)会沿表面放电(dian)或(huo)内部击穿。若需在(zai)水箱内进行试(shi)(shi)验(yan)，则(ze)试(shi)(shi)验(yan)物两端突(tu)出(chu)水面的长度(du)应不(bu)小(xiao)于200mm，且在(zai)规定(ding)的试(shi)(shi)验(yan)电(dian)压下不(bu)应发生沿表面的放电(dian)。

2、耐压测试步骤

试(shi)(shi)验步骤必须符合耐压(ya)(ya)(ya)试(shi)(shi)验操作规(gui)程(cheng)的(de)(de)要求。进行耐压(ya)(ya)(ya)试(shi)(shi)验时(shi)，耐压(ya)(ya)(ya)试(shi)(shi)验温度(du)与环境温度(du)之差不得超过3℃。电(dian)(dian)压(ya)(ya)(ya)应从较(jiao)低(di)值(zhi)(zhi)开始，缓慢(man)且相对(dui)平稳(wen)地上升至(zhi)规(gui)定(ding)的(de)(de)试(shi)(shi)验电(dian)(dian)压(ya)(ya)(ya)值(zhi)(zhi)，并保(bao)持(chi)规(gui)定(ding)的(de)(de)耐压(ya)(ya)(ya)时(shi)间。电(dian)(dian)压(ya)(ya)(ya)降低(di)时(shi)，直至(zhi)降低(di)至(zhi)电(dian)(dian)缆耐压(ya)(ya)(ya)试(shi)(shi)验规(gui)定(ding)电(dian)(dian)压(ya)(ya)(ya)值(zhi)(zhi)的(de)(de)40%时(shi)，方可切(qie)断(duan)电(dian)(dian)源(yuan)。在本次实验中，绝对(dui)不允(yun)许在高电(dian)(dian)压(ya)(ya)(ya)的(de)(de)情况下(xia)突然(ran)切(qie)断(duan)电(dian)(dian)源(yuan)，以免(mian)造成过电(dian)(dian)压(ya)(ya)(ya)。

3、电压试验评价

若试(shi)(shi)验(yan)(yan)电(dian)缆在规(gui)(gui)定(ding)时间内连续试(shi)(shi)验(yan)(yan)，未(wei)出现(xian)击穿(chuan)现(xian)象(xiang)(xiang)，则可认为试(shi)(shi)验(yan)(yan)对象(xiang)(xiang)已通过工频(pin)耐(nai)压(ya)试(shi)(shi)验(yan)(yan)。但(dan)如(ru)果在试(shi)(shi)验(yan)(yan)过程中，电(dian)缆的端(duan)部或端(duan)子沿(yan)其表面放电(dian)或内部击穿(chuan)，也允(yun)许进行另一端(duan)连接并(bing)重(zhong)复(fu)试(shi)(shi)验(yan)(yan)。除非产(chan)品(pin)标准(zhun)中有(you)特殊(shu)(shu)规(gui)(gui)定(ding)，所有(you)电(dian)缆耐(nai)压(ya)试(shi)(shi)验(yan)(yan)均(jun)需重(zhong)新计时。试(shi)(shi)验(yan)(yan)过程中，如(ru)因停电(dian)而停止耐(nai)压(ya)试(shi)(shi)验(yan)(yan)，除产(chan)品(pin)标准(zhun)有(you)特殊(shu)(shu)规(gui)(gui)定(ding)外，必须重(zhong)新进行试(shi)(shi)验(yan)(yan)。

上(shang)海冠测(ce)电(dian)(dian)(dian)气GCXZ串联谐振(zhen)耐压(ya)装置主要(yao)由变频(pin)(pin)控制(zhi)(zhi)器(qi)(qi)(qi)，励磁(ci)变压(ya)器(qi)(qi)(qi)，高(gao)(gao)压(ya)电(dian)(dian)(dian)抗器(qi)(qi)(qi)，高(gao)(gao)压(ya)分压(ya)器(qi)(qi)(qi)等组成(cheng)。变频(pin)(pin)控制(zhi)(zhi)器(qi)(qi)(qi)又分两大(da)类，20KW及(ji)以上(shang)为控制(zhi)(zhi)台(tai)式(shi)，20KW以下(xia)为便携箱式(shi)；它(ta)由控制(zhi)(zhi)器(qi)(qi)(qi)和(he)滤波(bo)器(qi)(qi)(qi)组成(cheng)。变频(pin)(pin)控制(zhi)(zhi)器(qi)(qi)(qi)主要(yao)作(zuo)用是把幅值(zhi)和(he)频(pin)(pin)率都固定(ding)的(de)(de)380V或200V工频(pin)(pin)正弦(xian)交(jiao)流电(dian)(dian)(dian)转(zhuan)变为幅值(zhi)和(he)频(pin)(pin)率可(ke)调的(de)(de)正弦(xian)波(bo)。并(bing)为整套设备提供电(dian)(dian)(dian)源。励磁(ci)变压(ya)器(qi)(qi)(qi)的(de)(de)作(zuo)用是将变频(pin)(pin)电(dian)(dian)(dian)源输出的(de)(de)电(dian)(dian)(dian)压(ya)升到(dao)合适的(de)(de)试验电(dian)(dian)(dian)压(ya)。高(gao)(gao)压(ya)电(dian)(dian)(dian)抗器(qi)(qi)(qi)L是谐振(zhen)回路重(zhong)要(yao)部件，当电(dian)(dian)(dian)源频(pin)(pin)率等于1/(2π√LCX)时，它(ta)与被试品(pin)CX发生串联谐振(zhen)。

变频串联谐(xie)振试验装置适(shi)(shi)用(yong)于(yu)(yu)10KV、35KV、110KV、220KV、500KV聚己(ji)烯(xi)电力(li)电缆交(jiao)流耐压(ya)(ya)试验。适(shi)(shi)用(yong)于(yu)(yu)60KV、220KV，500KVGIS交(jiao)流耐压(ya)(ya)试验。适(shi)(shi)用(yong)于(yu)(yu)大(da)型变压(ya)(ya)器，发(fa)电机组工(gong)频耐压(ya)(ya)试验；电力(li)变压(ya)(ya)器感应(ying)耐压(ya)(ya)试验；接(jie)地(di)电阻(zu)测(ce)量。