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马尔康关于afdd故障电弧断路器厂家简介

2019-05-08 09:58:55      点击:

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它的缺点:材料昂贵,工艺精密复杂,制造成本较高。但解决了电子式的缺点。综上述:目前发达国家如德国、美国、法国等发达国家于40年代后期就研制、制造并逐步推广应用纯电磁式漏电短路器,但发展中国家应受经济条件的约束,一般工矿业及住宅普遍选用电子式产品,但我国沿海发达地区省份在农网改造工程中及建筑施工中已经大量选用纯电磁式漏电断路器,为安全用电事业作出了巨大的贡献,为此,国家颁布的JGJ46-2005.8.2.13条也明文规定纯电磁式漏电断路作为我国建筑施工现场首选产品。众所周知,建筑施工现场是一个特定场所,因为它是一个临时用电系统,无法做到与工矿企业及住宅用电标准配制,大型设备及设备流动性较强,大电流启动频繁。上海继一电气有限公司HQPhxup,494656gtho9ZMDFGQO

”这一规定同样没有说明其原由和依据.令人难解。揣其意图可能认为信息设备和设备等属重要设备才值得装用价格较高的电磁式RCD,而对一般电气设备则不值得采用规定内全未提及两种RCD的动作与电源故障残压的关系.事关人身安全,恐也有欠妥当。图2所示为一单相TN—S系统.当中性线因断线或连接不良而不导通时.如果电气设备存在碰外壳接地故障,这时接触电压将为全PE线上故障电流产生的电压降,电击致死危险很大,但由于中性线不导通.电子式RCD却因端子处电源电压为零伏而拒动.后果将十分严重。对于TN—C—S系统,情况相同,不赘述。任何电气系统都有同时发生两个故障的可能上述3.0.3条的规定在上世纪70年代第一次编制《供配电系统设计规范》时正是出于笔者的笔下。

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