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管(guan)道阴(yin)极(ji)保(bao)护中(zhong)因(yin)为多半是(shi)埋地管(guan)线(xian)(xian)，现在的(de)(de)管(guan)道防腐(fu)(fu)层绝缘效(xiao)果出色，负面效(xiao)应就(jiu)是(shi)耦(ou)合(he)的(de)(de)杂(za)散电流增多，一旦管(guan)道穿过高压线(xian)(xian)路，或电气(qi)化铁路、电厂等干(gan)扰源，其容易干(gan)扰大(da)，杂(za)散电流多，甚至(zhi)有(you)些高电压大(da)电流会损(sun)坏阴(yin)极(ji)保(bao)护中(zhong)的(de)(de)恒(heng)电位(wei)仪。以至(zhi)于(yu)(yu)整个阴(yin)保(bao)工程无法投运，管(guan)道失去了保(bao)护，给管(guan)线(xian)(xian)寿命带来(lai)影响。固(gu)态去耦(ou)合(he)器(qi)(qi)应运而生，他可(ke)有(you)效(xiao)的(de)(de)排除各(ge)种高于(yu)(yu)阴(yin)保(bao)要求的(de)(de)杂(za)散电流，并(bing)且防止雷击损(sun)坏，耦(ou)合(he)交流电压。 最早于(yu)(yu)加(jia)拿大(da)防腐(fu)(fu)设备巨头RUSTROL公司研制并(bing)投入市(shi)场，因(yin)其售价较高，大(da)陆大(da)多采用(yong)其合(he)资生产商，锦(jin)然电气(qi)（青岛）有(you)限公司生产的(de)(de)ISSD系列固(gu)态去耦(ou)合(he)器(qi)(qi)。售价便宜(yi)，做(zuo)工优良，品质(zhi)安全(quan)可(ke)靠。是(shi)国(guo)内标(biao)准的(de)(de)制定者，中(zhong)石油(you)中(zhong)石化上图指定型号(hao)。唯(wei)有(you)不足(zu)之处，其受(shou)外国(guo)高端元器(qi)(qi)件产能影响，库存(cun)较少，供货周期稍长。[1]

去耦合器采用先进的(de)固态(tai)技术。非金属壳(qiao)体。能安全(quan)有效的(de)控制管道上交流(liu)(liu)故障电流(liu)(liu)或雷电流(liu)(liu)对埋(mai)地管道的(de)影

固态去耦合器

固态去耦(ou)合(he)器

响，延长管(guan)道(dao)的使用寿命(ming)。同时(shi)，又能防止杂散电流在管(guan)道(dao)上汇集后对人体的危(wei)害以及对通信线(xian)路(lu)的干(gan)扰。

作为直流(liu)(liu)(liu)(liu)隔(ge)离(li)和交流(liu)(liu)(liu)(liu)耦(ou)合装置，SSD用于(yu)(yu)防止(zhi)阴极保护(hu)电(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)达到(dao)预定的(de)阈值(zhi)电(dian)(dian)(dian)(dian)压(ya)(ya)(ya)(ya)，同时(shi)还能传导(dao)感应的(de)交流(liu)(liu)(liu)(liu)电(dian)(dian)(dian)(dian)。当电(dian)(dian)(dian)(dian)压(ya)(ya)(ya)(ya)力图超过阈值(zhi)电(dian)(dian)(dian)(dian)压(ya)(ya)(ya)(ya)时(shi)，SSD立即切(qie)换(huan)(huan)到(dao)短路模式(shi)，以提供过压(ya)(ya)(ya)(ya)保护(hu)．当过电(dian)(dian)(dian)(dian)压(ya)(ya)(ya)(ya)过去之后(hou)，又(you)自(zi)动(dong)切(qie)换(huan)(huan)回(hui)到(dao)直流(liu)(liu)(liu)(liu)隔(ge)离(li)模式(shi)。这样的(de)运行方式(shi)可以进行无数次,这通常是由于(yu)(yu)交流(liu)(liu)(liu)(liu)故障电(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)或雷电(dian)(dian)(dian)(dian)电(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)引起。SSD的(de)标准阂值(zhi)电(dian)(dian)(dian)(dian)压(ya)(ya)(ya)(ya)为-2V/+2V。阈值(zhi)电(dian)(dian)(dian)(dian)压(ya)(ya)(ya)(ya)可以是绝对(dui)值(zhi)电(dian)(dian)(dian)(dian)压(ya)(ya)(ya)(ya)，或峰值(zhi)电(dian)(dian)(dian)(dian)压(ya)(ya)(ya)(ya)，在此电(dian)(dian)(dian)(dian)压(ya)(ya)(ya)(ya)处切(qie)换(huan)(huan)发生，此电(dian)(dian)(dian)(dian)压(ya)(ya)(ya)(ya)为跨(kua)于(yu)(yu)隔(ge)离(li)器两(liang)端的(de)市流(liu)(liu)(liu)(liu)和交流(liu)(liu)(liu)(liu)峰值(zhi)电(dian)(dian)(dian)(dian)压(ya)(ya)(ya)(ya)之和。这使得跨(kua)于(yu)(yu)SSD端子(zi)上(shang)的(de)箝位(wei)电(dian)(dian)(dian)(dian)压(ya)(ya)(ya)(ya)很低、很安全(quan)。

与DEI的(de)大多数产品一样，SSD经过(guo)(guo)独立的(de)实(shi)(shi)验室认(ren)证(zheng)．确认(ren)符合所有知名的(de)美国(guo)、加(jia)拿(na)大和(he)欧洲标(biao)准(zhun)。检验和(he)认(ren)证(zheng)由(you)美国(guo)保险商实(shi)(shi)验所(Underwriters Laboratorics---UL)和(he)Demko执行，因此取得UL、CUI(满足CSA要(yao)求(qiu))列名和(he)CE标(biao)志。经过(guo)(guo)认(ren)证(zheng),SSD可用于危险的(de)场合(2类2区)。