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电容补偿柜稳定运行防烧毁有诀窍

文章出处(chu):人气:21发表时间:2022-01-22 11:48:31

低压电(dian)(dian)(dian)容(rong)补偿(chang)(chang)柜主要用(yong)在(zai)(zai)低压配电(dian)(dian)(dian)室或(huo)用(yong)于补偿(chang)(chang)发感性负(fu)载中无功(gong)电(dian)(dian)(dian)流(liu)、减轻(qing)发电(dian)(dian)(dian)机工作负(fu)荷,增(zeng)加(jia)发电(dian)(dian)(dian)机可使用(yong)容(rong)量,通(tong)过在(zai)(zai)系统中适(shi)当地(di)增(zeng)加(jia)电(dian)(dian)(dian)容(rong)的方(fang)式就(jiu)可以得以改善。 电(dian)(dian)(dian)力电(dian)(dian)(dian)容(rong)补偿(chang)(chang)也(ye)称(cheng)功(gong)率因数补偿(chang)(chang)。目前在大(da)型商场或工(gong)业领(ling)域(yu)应用效果明显。可减少一定的用电(dian)量(liang)、节省(sheng)电(dian)力,为企业节省(sheng)大(da)量(liang)开支。

电容补偿柜.jpg

电(dian)容补(bu)偿柜(ju)在实际使用(yong)过程中,由于多(duo)种原(yuan)因(yin)会造成电(dian)容补(bu)偿柜(ju)内部(bu)元(yuan)器件的烧毁,因(yin)此(ci)J9九游会AG 需(xu)要找到烧毁原(yuan)因(yin),并做好提前预防。

一(yi)、低压电容补偿柜烧(shao)毁(hui)主要原因(yin)如下(xia):

1、低压电(dian)容补偿(chang)柜(ju)烧(shao)毁之一-感性负载过大

在配电(dian)设备(bei)应用时,生产中的(de)感(gan)(gan)性负荷过大,当补偿电(dian)流(liu)超出电(dian)容(rong)(rong)额度时,电(dian)容(rong)(rong)容(rong)(rong)易烧(shao)毁出现爆(bao)裂(lie)(lie)状。因(yin)此及时调整(zheng)电(dian)容(rong)(rong)组数(shu)或容(rong)(rong)量很重(zhong)要。如果同相(xiang)(xiang)(xiang)(xiang)位(wei)的(de)电(dian)容(rong)(rong)器出现多个爆(bao)裂(lie)(lie)情况,很大可能性是电(dian)流(liu)偏相(xiang)(xiang)(xiang)(xiang)造(zao)(zao)成的(de),比如电(dian)感(gan)(gan)式灯(deng)管等单相(xiang)(xiang)(xiang)(xiang)感(gan)(gan)性负荷偏相(xiang)(xiang)(xiang)(xiang)造(zao)(zao)成的(de),调整(zheng)相(xiang)(xiang)(xiang)(xiang)间均衡(heng)负荷可避免烧(shao)毁情况发生。

而现实中(zhong)通过(guo)手工调整很难满(man)足(zu)要(yao)求,因此(ci)可采用微电(dian)脑(nao)电(dian)容(rong)(rong)控制系统可解决以上弊端(duan),它(ta)可根(gen)据(ju)用电(dian)负(fu)荷的变化,而自动控制电(dian)容(rong)(rong)组数的投入。进(jin)行电(dian)流补(bu)偿(chang),从而减低(di)大量无功电(dian)流。使线路(lu)电(dian)能损耗降到最(zui)低(di)程度,提(ti)供一个高素质的电(dian)力(li)源。

电容补偿柜防烧毁措施.jpg


2、低(di)压电(dian)容补(bu)偿柜(ju)烧毁之(zhi)二-谐波造成电(dian)容器烧毁

大功率用(yong)电(dian)(dian)(dian)(dian)设备(bei)在(zai)受控开关动作瞬(shun)间(jian)都会(hui)产生电(dian)(dian)(dian)(dian)压、电(dian)(dian)(dian)(dian)流(liu)(liu)谐(xie)(xie)波(bo),负(fu)荷为变(bian)频调速。谐(xie)(xie)波(bo)电(dian)(dian)(dian)(dian)流(liu)(liu)一旦被(bei)电(dian)(dian)(dian)(dian)容器(qi)(qi)放大之后并(bing)叠加(jia)在(zai)电(dian)(dian)(dian)(dian)容的(de)(de)基波(bo)电(dian)(dian)(dian)(dian)流(liu)(liu)上时,会(hui)使流(liu)(liu)过电(dian)(dian)(dian)(dian)容器(qi)(qi)电(dian)(dian)(dian)(dian)流(liu)(liu)的(de)(de)有效值增加(jia).电(dian)(dian)(dian)(dian)力电(dian)(dian)(dian)(dian)容器(qi)(qi)由(you)于谐(xie)(xie)波(bo)电(dian)(dian)(dian)(dian)流(liu)(liu)引起附(fu)加(jia)绝(jue)缘介(jie)质损耗加(jia)大、温(wen)度(du)升高,电(dian)(dian)(dian)(dian)容器(qi)(qi)绝(jue)缘层会(hui)加(jia)快(kuai)老化(hua),继而(er)引起电(dian)(dian)(dian)(dian)容器(qi)(qi)过热(re)而(er)发生爆炸。

另(ling)外谐(xie)波(bo)(bo)电(dian)(dian)流(liu)会造(zao)成电(dian)(dian)容器(qi)(qi)(qi)发生局部放电(dian)(dian)不能(neng)熄灭(mie),这也是电(dian)(dian)容器(qi)(qi)(qi)损坏的一个主要原因(yin)。谐(xie)波(bo)(bo)含量较大时而(er)无(wu)功(gong)(gong)仍然投入的话,极易造(zao)成自愈式并联电(dian)(dian)容器(qi)(qi)(qi)的谐(xie)波(bo)(bo)击穿;谐(xie)波(bo)(bo)串入无(wu)功(gong)(gong)补(bu)偿柜,电(dian)(dian)压升高,烧(shao)毁低压电(dian)(dian)器(qi)(qi)(qi)。征对上述(shu)情(qing)况(kuang)在实际生产中,可采取谐(xie)波(bo)(bo)抑(yi)制(zhi)方法解决问(wen)题。

二(er)、低压电容补偿柜烧毁(hui)解决(jue)方法

1、根据并(bing)联(lian)电容(rong)器(qi)对谐(xie)(xie)(xie)波电流放大(da)的(de)原理,改变并(bing)联(lian)电容(rong)器(qi)与系统阻抗(kang)的(de)谐(xie)(xie)(xie)振(zhen)点,避(bi)免(mian)谐(xie)(xie)(xie)振(zhen)发生,即串联(lian)电抗(kang)器(qi),串接(jie)电抗(kang)器(qi)电感量(liang)大(da)小(xiao)控制并(bing)联(lian)谐(xie)(xie)(xie)振(zhen)点的(de)位置,能(neng)够(gou)有效(xiao)避(bi)开谐(xie)(xie)(xie)波源中所包含的(de)各次谐(xie)(xie)(xie)波。避(bi)免(mian)谐(xie)(xie)(xie)振(zhen)的(de)发生。如果负荷容(rong)量(liang)过大(da)大(da).加(jia)(jia)进线电抗(kang)器(qi)效(xiao)果不明(ming)显,仅仅对谐(xie)(xie)(xie)波起抑制作用(yong),不能(neng)根除谐(xie)(xie)(xie)波,要想(xiang)彻底的(de)解决(jue)谐(xie)(xie)(xie)波问题,还要在(zai)谐(xie)(xie)(xie)波原加(jia)(jia)滤波装置。

电容补偿柜稳定运行防烧毁.jpg

2、如果(guo)不考虑经(jing)济成本,由于滤(lv)波(bo)(bo)(bo)(bo)器(qi)(qi)的价格较高(gao),可采(cai)用的办(ban)法是加(jia)低压(ya)(ya)滤(lv)波(bo)(bo)(bo)(bo)器(qi)(qi),滤(lv)除谐波(bo)(bo)(bo)(bo)的同时也(ye)可以(yi)提高(gao)功率因数。另外(wai)从理论上讲(jiang)可以(yi)尝试(shi)加(jia)装5%的串联电抗。低压(ya)(ya)电容(rong)设计一(yi)(yi)般都是400V的,没有考虑谐波(bo)(bo)(bo)(bo)电流导(dao)致电容(rong)器(qi)(qi)谐波(bo)(bo)(bo)(bo)电压(ya)(ya)增(zeng)加(jia)的那一(yi)(yi)部分,加(jia)上谐波(bo)(bo)(bo)(bo)电流在实际(ji)电网里(li)在一(yi)(yi)个大概的频谱范围波(bo)(bo)(bo)(bo)动(dong),所以(yi)这(zhei)种办(ban)法长期使(shi)用存(cun)在着问题。

3、如果(guo)功率因数(shu)允(yun)许的(de)情况下,可以切断电容器(qi)运行(xing),或者手动关掉l/3的(de)电容器(qi),也就是(shi)说(shuo)让(rang)电容器(qi)处(chu)于欠补(bu)偿状态。但这毕竟是(shi)权宜之计,不适合(he)长期(qi)稳定(ding)运行(xing)。

综上所术,电容补偿柜内电容器损坏的问题是多方而的,情况比较复杂,一旦设备出现问题影响也比较大。因此J9九游会AG 平时在设备运行时要做好检测和预防工作,做好并联电容器对谐波的抑制防范问题,并要解决好谐波对其它设备和电网的波动影响。根本办法就是从源头抓起,对配电系统内部影响较大的谐波源的负荷实施就地治理原则.实时调整好相间负荷均衡,减少过多的谐波电流流入配电系统,这是较有效也是标本兼治解决办法。


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