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自动重合闸漏电保护器使用事项有哪些?

浏览量:140 时间(jian):2022-09-28

信息摘要:

自动(dong)重合(he)闸漏(lou)(lou)电(dian)(dian)(dian)保(bao)护器使(shi)(shi)用事项: 1.自动(dong)重合(he)闸漏(lou)(lou)电(dian)(dian)(dian)保(bao)护器适用于(yu)(yu)电(dian)(dian)(dian)源中性(xing)点直接(jie)(jie)接(jie)(jie)地(di)或经过 电(dian)(dian)(dian)阻(zu)、电(dian)(dian)(dian)抗接(jie)(jie)地(di)的(de) 低压配电(dian)(dian)(dian)系(xi)统(tong)。 对于(yu)(yu)电(dian)(dian)(dian)源中性(xing)点不(bu)接(jie)(jie)地(di)的(de)系(xi)统(tong),则不(bu)宜采用自动(dong)重合(he)闸漏(lou)(lou)电(dian)(dian)(dian)保(bao)护器。 因为(wei)后者不(bu)能(neng)构成泄(xie)漏(lou)(lou)电(dian)(dian)(dian)气回路,即使(shi)(shi)发生了接(jie)(jie)地(di)故障,产生了大于(yu)(yu)或等(deng)于(yu)(yu)自

        自动重合闸漏电保护器使用事项:


        1.自(zi)动(dong)重(zhong)合(he)(he)闸漏(lou)(lou)电(dian)(dian)(dian)保护(hu)器(qi)适用(yong)于(yu)电(dian)(dian)(dian)源(yuan)中性点直接(jie)(jie)接(jie)(jie)地(di)或(huo)经过 电(dian)(dian)(dian)阻、电(dian)(dian)(dian)抗(kang)接(jie)(jie)地(di)的 低压(ya)配电(dian)(dian)(dian)系(xi)统。 对于(yu)电(dian)(dian)(dian)源(yuan)中性点不(bu)接(jie)(jie)地(di)的系(xi)统,则(ze)不(bu)宜(yi)采用(yong)自(zi)动(dong)重(zhong)合(he)(he)闸漏(lou)(lou)电(dian)(dian)(dian)保护(hu)器(qi)。 因为后者(zhe)不(bu)能构成泄漏(lou)(lou)电(dian)(dian)(dian)气回路(lu),即使发生(sheng)了(le)接(jie)(jie)地(di)故障,产(chan)生(sheng)了(le)大于(yu)或(huo)等于(yu)自(zi)动(dong)重(zhong)合(he)(he)闸漏(lou)(lou)电(dian)(dian)(dian)保护(hu)器(qi)的额定 动(dong)作电(dian)(dian)(dian)流,该保护(hu)器(qi)也不(bu)能及时动(dong)作切(qie)断电(dian)(dian)(dian)源(yuan)回路(lu);或(huo)者(zhe)依靠人体接(jie)(jie)能故障点去构成泄漏(lou)(lou)电(dian)(dian)(dian)气回路(lu),促使自(zi)动(dong)重(zhong)合(he)(he)闸漏(lou)(lou)电(dian)(dian)(dian)保护(hu)器(qi)动(dong)作,切(qie)断电(dian)(dian)(dian)源(yuan)回路(lu)。 但是,这对人体仍不(bu)安全。 显而易见,必须具备(bei)接(jie)(jie)地(di)装置的条(tiao)件, 电(dian)(dian)(dian)气设备(bei)发生(sheng)漏(lou)(lou)电(dian)(dian)(dian)时,且漏(lou)(lou)电(dian)(dian)(dian)电(dian)(dian)(dian)流达到(dao)动(dong)作电(dian)(dian)(dian)流时,就能在0.1 秒内(nei)立即跳闸,切(qie)断了(le)电(dian)(dian)(dian)源(yuan)主回路(lu)。

 

        2.自动(dong)重合闸(zha)漏(lou)电(dian)保护器保护线(xian)路的工作(zuo)中性(xing)线(xian)N 要(yao)通过零序(xu)电(dian)流互感(gan)器。 否则,在接通后,就会有一个 不(bu)平衡电(dian)流使自动(dong)重合闸(zha)漏(lou)电(dian)保护器产(chan)生误(wu)动(dong)作(zuo)。


        3.接零保(bao)护(hu)线(PE) 不(bu)准(zhun)通(tong)过(guo)(guo) 零序(xu)电流(liu)互(hu)(hu)感(gan)器(qi)(qi)。 因(yin)为保(bao)护(hu)线路(PE) 通(tong)过(guo)(guo)零序(xu) 电流(liu)互(hu)(hu)感(gan)器(qi)(qi)时(shi), 漏(lou)电电流(liu)经PE 保(bao)护(hu)线又(you)回(hui)穿过(guo)(guo)零序(xu) 电流(liu)互(hu)(hu)感(gan)器(qi)(qi),导致电流(liu)抵消,而(er)互(hu)(hu)感(gan)器(qi)(qi)上检测不(bu)出漏(lou)电电流(liu)值。 在(zai)出现(xian)故(gu)障时(shi),造成自(zi)动重合闸(zha)漏(lou)电保(bao)护(hu)器(qi)(qi)不(bu)动作(zuo),起(qi)不(bu)到保(bao)护(hu)作(zuo)用。

 

        4.控制回路的(de)工作(zuo) 中性线不能进行重复接地(di)。 一(yi)(yi)(yi)方(fang)面(mian),重复接地(di)时(shi),在正常工作(zuo)情况下(xia),工作(zuo)电(dian)流(liu)的(de)一(yi)(yi)(yi)部分经由重复接地(di)回到(dao)电(dian)源中性点,在电(dian)流(liu)互(hu)感器(qi)中会出现不平(ping)衡电(dian)流(liu)。 当不平(ping)衡电(dian)流(liu)达到(dao)一(yi)(yi)(yi)定值时(shi),自动重合闸(zha)漏(lou)电(dian)保护(hu)(hu)器(qi)便产生误动作(zuo);另一(yi)(yi)(yi)方(fang)面(mian),因故障漏(lou)电(dian)时(shi),保护(hu)(hu)线上的(de)漏(lou)电(dian)电(dian)流(liu)也(ye)可能穿过电(dian)流(liu)互(hu)感器(qi)的(de)个(ge)性线回到(dao)电(dian)源中性点,抵消了互(hu)感器(qi)的(de)漏(lou)电(dian)电(dian)流(liu),而使保护(hu)(hu)器(qi)拒绝动作(zuo)。


        5.自动(dong)重(zhong)合(he)闸漏(lou)(lou)电(dian)保(bao)护(hu)器后面的工作(zuo)中性线(xian)N 与保(bao)护(hu)线(xian)(PE) 不能合(he)并(bing)为(wei)一(yi)(yi)体。 如果(guo)二(er)者合(he)并(bing)为(wei)一(yi)(yi)体时,当出现(xian)漏(lou)(lou)电(dian)故障或人体 触电(dian)时,漏(lou)(lou)电(dian)电(dian)流经由电(dian)流互感器回(hui)流,结果(guo)又(you)雷同(tong)于情(qing)况(3) ,造(zao)成(cheng)自动(dong)重(zhong)合(he)闸漏(lou)(lou)电(dian)保(bao)护(hu)器拒绝动(dong)作(zuo)。

 

        6.被保护(hu)的(de)(de)(de)用电(dian)(dian)设备(bei)与自(zi)动(dong)重(zhong)合闸漏(lou)电(dian)(dian)保护(hu)器(qi)之间(jian)的(de)(de)(de)各线(xian)(xian)互(hu)相(xiang)不能(neng)碰(peng)接(jie)(jie)。 如果出(chu)现线(xian)(xian)间(jian)相(xiang)碰(peng)或零线(xian)(xian)间(jian)相(xiang)交(jiao)接(jie)(jie),会立刻(ke)破坏了(le)零序平衡(heng)电(dian)(dian)流(liu)值,而引起自(zi)动(dong)重(zhong)合闸漏(lou)电(dian)(dian)保护(hu)器(qi)误动(dong)作(zuo);另外,被保护(hu)的(de)(de)(de)用电(dian)(dian)设备(bei)只能(neng)并联安装在自(zi)动(dong)重(zhong)合闸漏(lou)电(dian)(dian)保护(hu)器(qi)之后,接(jie)(jie)线(xian)(xian)保证正确,也不许将用电(dian)(dian)设备(bei)接(jie)(jie)在实验按钮的(de)(de)(de)接(jie)(jie)线(xian)(xian)处。



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