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监控工程中如何做好预防抗干扰工作

监(jian)控工(gong)程中如何(he)做好(hao)预防抗干扰工(gong)作


       雷电(dian)(dian)(dian)(dian)过(guo)电(dian)(dian)(dian)(dian)压、电(dian)(dian)(dian)(dian)力系统操作过(guo)电(dian)(dian)(dian)(dian)压、静电(dian)(dian)(dian)(dian)放(fang)电(dian)(dian)(dian)(dian)、电(dian)(dian)(dian)(dian)磁(ci)辐(fu)射(she)等电(dian)(dian)(dian)(dian)磁(ci)干扰, 使得监(jian)控系统设备极易遭雷击过(guo)电(dian)(dian)(dian)(dian)压破坏, 造成整个监控系统瘫(tan)痪(huan)。那么如何(he)做好监控工程防(fang)干扰工作? 南京安监控安装公司为大家讲解下:

 
1、传(chuan)输线(xian)(xian)缆,穿镀(du)锌铁管,走镀(du)锌铁皮(pi)线(xian)(xian)槽,深埋地下布(bu)线(xian)(xian)等,给(ji)传(chuan)输线(xian)(xian)缆一个屏(ping)蔽电(dian)磁干扰的环(huan)境(jing),这(zhei)是最基本(ben)最有(you)效(xiao)的防(fang)止(zhi)干扰“入(ru)侵(qin)”的手段(duan),包(bao)括(kuo)变电(dian)站超(chao)高压(ya)环(huan)境(jing)下的安全传(chuan)输,都是有(you)效(xiao)的。不足之处是成本(ben)较(jiao)高,不能架空布(bu)线(xian)(xian),施工较(jiao)麻烦; 
 

2、eie双绝(jue)缘(yuan)双屏(ping)(ping)蔽(bi)抗干(gan)(gan)扰(rao)同轴电缆(lan),是抗干(gan)(gan)扰(rao)技术(shu)的一(yi)项(xiang)自有(you)(you)知识产权(quan)的新成(cheng)果,其原理与穿铁管基本相同,外(wai)层(ceng)(ceng)是干(gan)(gan)扰(rao)屏(ping)(ping)蔽(bi)层(ceng)(ceng),提供内(nei)(nei)部无干(gan)(gan)扰(rao)的传(chuan)输(shu)(shu)环境,内(nei)(nei)屏(ping)(ping)蔽(bi)层(ceng)(ceng)是同轴传(chuan)输(shu)(shu)回(hui)路的实际信号(hao)地,干(gan)(gan)扰(rao)在外(wai)屏(ping)(ping)蔽(bi)层(ceng)(ceng)上(shang)产生感(gan)应电动(dong)势,通过接“大(da)地”屏(ping)(ping)蔽(bi)干(gan)(gan)扰(rao),内(nei)(nei)外(wai)屏(ping)(ping)蔽(bi)层(ceng)(ceng)绝(jue)缘(yuan),使(shi)干(gan)(gan)扰(rao)感(gan)应电动(dong)势与视频信号(hao)传(chuan)输(shu)(shu)回(hui)路绝(jue)缘(yuan),有(you)(you)效防止了干(gan)(gan)扰(rao)的“入(ru)侵”。优点是布线(xian)简单方(fang)便,成(cheng)本低,在不能准确判断是否会有(you)(you)干(gan)(gan)扰(rao)的情况下(xia),基本可以(yi)实现“防干(gan)(gan)扰(rao)盲目布线(xian)”; 


 
“避(bi)”:避(bi)开干扰(rao)(rao) ,另选一(yi)条 “路”,改变源信(xin)号(hao)(hao)传输(shu)方(fang)式,属于(yu)这异类(lei)的技术(shu)有(you):光缆传输(shu)(模拟调(diao)制解调(diao)和(he)(he)数字(zi)调(diao)制解调(diao)技术(shu)),射频,微(wei)波(bo),数字(zi)变换(huan)(huan)(huan)等各(ge)种传输(shu)方(fang)式,都属于(yu)“信(xin)息调(diao)制和(he)(he)变换(huan)(huan)(huan)”方(fang)式,或“频分方(fang)式”,它能有(you)效避(bi)开源信(xin)号(hao)(hao)传输(shu)中,0-6M频率范围的直接干扰(rao)(rao);这种方(fang)式抗干扰(rao)(rao)很(hen)有(you)效。目前也有(you)一(yi)些(xie)不肯介绍原理的产品,如采用编码和(he)(he)向上移动(dong)信(xin)号(hao)(hao)频带的方(fang)法等,大概也属于(yu)这一(yi)类(lei)产品。采用“避(bi)”的技术(shu),工程中还应考虑(lv)两个问题:一(yi)是成本和(he)(he)复杂度的提高(gao),二(er)是变换(huan)(huan)(huan)损失(shi),失(shi)真和(he)(he)信(xin)噪比的降低,不要一(yi)个矛盾掩盖另一(yi)个矛盾。 
 
“抗”:视频(pin)信(xin)号传输过程中,如果干(gan)扰(rao)(rao)已经“混”进视频(pin)信(xin)号中,使(shi)信(xin)噪比(指(zhi)信(xin)号/干(gan)扰(rao)(rao)比)严重降低,必须(xu)采用抗干(gan)扰(rao)(rao)设备(bei),抑制干(gan)扰(rao)(rao)信(xin)号幅度,提(ti)高(gao)信(xin)噪比。 

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