自动重合闸漏电保护器使用注意事项
时间: 2022-10-25 09:47:29 浏览次数:233
自动重合闸漏电保护器使用注意事项: 1.自动重合闸漏电保护器适用于电源中性点直接接地或经过电阻、电抗接地的低压配电系统。 对于电源中性点不接地的系统,则不宜采用自动重合闸漏电保护器。 因为后者不能构成泄漏电气回路,即使发生了接地故障,产生了大于或等于自动重合闸漏电

      自动重合闸漏电保护器使用注意事项:


      1.自(zi)(zi)动(dong)(dong)(dong)重合(he)(he)闸漏电(dian)(dian)(dian)(dian)(dian)保(bao)护(hu)(hu)器适用(yong)于(yu)电(dian)(dian)(dian)(dian)(dian)源(yuan)中性点(dian)直接接地(di)(di)或(huo)经过电(dian)(dian)(dian)(dian)(dian)阻(zu)、电(dian)(dian)(dian)(dian)(dian)抗(kang)接地(di)(di)的(de)低压(ya)配(pei)电(dian)(dian)(dian)(dian)(dian)系(xi)统(tong)。 对于(yu)电(dian)(dian)(dian)(dian)(dian)源(yuan)中性点(dian)不(bu)(bu)接地(di)(di)的(de)系(xi)统(tong),则不(bu)(bu)宜采(cai)用(yong)自(zi)(zi)动(dong)(dong)(dong)重合(he)(he)闸漏电(dian)(dian)(dian)(dian)(dian)保(bao)护(hu)(hu)器。 因为后者(zhe)不(bu)(bu)能(neng)构(gou)成泄(xie)(xie)漏电(dian)(dian)(dian)(dian)(dian)气回路(lu)(lu),即使发生(sheng)(sheng)了接地(di)(di)故障,产生(sheng)(sheng)了大于(yu)或(huo)等于(yu)自(zi)(zi)动(dong)(dong)(dong)重合(he)(he)闸漏电(dian)(dian)(dian)(dian)(dian)保(bao)护(hu)(hu)器的(de)额定动(dong)(dong)(dong)作电(dian)(dian)(dian)(dian)(dian)流,该(gai)保(bao)护(hu)(hu)器也不(bu)(bu)能(neng)及时(shi)(shi)动(dong)(dong)(dong)作切(qie)断(duan)电(dian)(dian)(dian)(dian)(dian)源(yuan)回路(lu)(lu);或(huo)者(zhe)依(yi)靠人(ren)体(ti)接能(neng)故障点(dian)去构(gou)成泄(xie)(xie)漏电(dian)(dian)(dian)(dian)(dian)气回路(lu)(lu),促使自(zi)(zi)动(dong)(dong)(dong)重合(he)(he)闸漏电(dian)(dian)(dian)(dian)(dian)保(bao)护(hu)(hu)器动(dong)(dong)(dong)作,切(qie)断(duan)电(dian)(dian)(dian)(dian)(dian)源(yuan)回路(lu)(lu)。 但(dan)是,这对人(ren)体(ti)仍不(bu)(bu)。 显而易见,必须具备接地(di)(di)装置(zhi)的(de)条件,电(dian)(dian)(dian)(dian)(dian)气设备发生(sheng)(sheng)漏电(dian)(dian)(dian)(dian)(dian)时(shi)(shi),且漏电(dian)(dian)(dian)(dian)(dian)电(dian)(dian)(dian)(dian)(dian)流达(da)到动(dong)(dong)(dong)作电(dian)(dian)(dian)(dian)(dian)流时(shi)(shi),能(neng)在0.1 秒内立即跳(tiao)闸,切(qie)断(duan)了电(dian)(dian)(dian)(dian)(dian)源(yuan)主回路(lu)(lu)。


      2.自(zi)动重(zhong)合闸漏电(dian)保护器保护线路的工作中性线N 要(yao)通(tong)过零序电(dian)流(liu)互感器。否(fou)则,在接通(tong)后,会(hui)有(you)一(yi)个不平衡(heng)电(dian)流(liu)使自(zi)动重(zhong)合闸漏电(dian)保护器产生误动作。


      3.接(jie)零(ling)保(bao)(bao)(bao)护(hu)(hu)线(PE) 不准通过(guo)零(ling)序电流(liu)(liu)互感器。 因为保(bao)(bao)(bao)护(hu)(hu)线路(PE) 通过(guo)零(ling)序电流(liu)(liu)互感器时,漏电电流(liu)(liu)经PE 保(bao)(bao)(bao)护(hu)(hu)线又回穿(chuan)过(guo)零(ling)序电流(liu)(liu)互感器,导(dao)致电流(liu)(liu)抵消,而互感器上检测不出(chu)漏电电流(liu)(liu)值(zhi)。 在出(chu)现故障时,造成自(zi)动(dong)重合闸漏电保(bao)(bao)(bao)护(hu)(hu)器不动(dong)作(zuo),起不到(dao)保(bao)(bao)(bao)护(hu)(hu)作(zuo)用。


      4.控制回(hui)路的(de)工(gong)作(zuo)(zuo)中性(xing)(xing)线(xian)不(bu)能进行重复(fu)接(jie)(jie)地。 一(yi)(yi)方面(mian),重复(fu)接(jie)(jie)地时,在(zai)正常工(gong)作(zuo)(zuo)情况下,工(gong)作(zuo)(zuo)电(dian)流(liu)的(de)一(yi)(yi)部(bu)分经由(you)重复(fu)接(jie)(jie)地回(hui)到(dao)电(dian)源中性(xing)(xing)点,在(zai)电(dian)流(liu)互(hu)(hu)感(gan)(gan)器(qi)中会出(chu)现不(bu)平衡(heng)电(dian)流(liu)。 当(dang)不(bu)平衡(heng)电(dian)流(liu)达到(dao)一(yi)(yi)定值时,自(zi)动重合(he)闸漏电(dian)保(bao)护(hu)器(qi)便(bian)产生(sheng)误动作(zuo)(zuo);另(ling)一(yi)(yi)方面(mian),因故障漏电(dian)时,保(bao)护(hu)线(xian)上的(de)漏电(dian)电(dian)流(liu)也可能穿过电(dian)流(liu)互(hu)(hu)感(gan)(gan)器(qi)的(de)个性(xing)(xing)线(xian)回(hui)到(dao)电(dian)源中性(xing)(xing)点,抵消了互(hu)(hu)感(gan)(gan)器(qi)的(de)漏电(dian)电(dian)流(liu),而使保(bao)护(hu)器(qi)拒绝(jue)动作(zuo)(zuo)。


      5.自动(dong)重(zhong)合闸(zha)漏(lou)(lou)电(dian)(dian)(dian)(dian)保(bao)护(hu)器后面的工作(zuo)(zuo)中性(xing)线N 与保(bao)护(hu)线(PE) 不能合并为(wei)一体(ti)。 如果(guo)二(er)者合并为(wei)一体(ti)时,当出现漏(lou)(lou)电(dian)(dian)(dian)(dian)故(gu)障或人体(ti)触电(dian)(dian)(dian)(dian)时,漏(lou)(lou)电(dian)(dian)(dian)(dian)电(dian)(dian)(dian)(dian)流(liu)经由电(dian)(dian)(dian)(dian)流(liu)互感器回流(liu),结果(guo)又雷同于(yu)情况3 ,造成自动(dong)重(zhong)合闸(zha)漏(lou)(lou)电(dian)(dian)(dian)(dian)保(bao)护(hu)器拒(ju)绝(jue)动(dong)作(zuo)(zuo)。


      6.被保(bao)护(hu)的(de)用电设(she)(she)备(bei)(bei)与自(zi)动(dong)重合(he)(he)(he)闸漏电保(bao)护(hu)器之(zhi)间(jian)的(de)各线(xian)互(hu)相不能碰接(jie)(jie)。 如果(guo)出现(xian)线(xian)间(jian)相碰或零线(xian)间(jian)相交接(jie)(jie),会立(li)刻破坏了零序平衡(heng)电流值,而引(yin)起(qi)自(zi)动(dong)重合(he)(he)(he)闸漏电保(bao)护(hu)器误动(dong)作;另外,被保(bao)护(hu)的(de)用电设(she)(she)备(bei)(bei)只(zhi)能并联安(an)装在自(zi)动(dong)重合(he)(he)(he)闸漏电保(bao)护(hu)器之(zhi)后(hou),接(jie)(jie)线(xian)保(bao)证正确,也不许将用电设(she)(she)备(bei)(bei)接(jie)(jie)在实验按钮的(de)接(jie)(jie)线(xian)处。


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