一种电能表磁保持继电器拉闸方式的软件消弧设计  

A soft arc suppression design of the trip mode about electronic Watt-hour meter with magnetic latching relay

作　　者：郜波[1] 罗冉冉[1] 李亦非[2] 吴小林[2] 杨草田 董益斌 

机构地区：[1]中国电力科学研究院计量研究所,北京100192 [2]国网北京市电力公司电力科学研究院,北京100045 [3]华立仪表集团有限公司,杭州310023

出　　处：《电测与仪表》2016年第16期68-74,79,共8页Electrical Measurement & Instrumentation

摘　　要：磁保持继电器在电能表中起着自动接通和切断作用,在电力行业起到重要的作用。但大电流拉闸可能导致磁保持继电器触点的损伤,多次损伤后导致继电器触点烧蚀粘连无法正常断开,严重时会酿成火灾。结合电能表的运行原理和负载的实际状况采用软件消弧设计实现电流过零拉闸,达到在大电流拉闸时保护磁保持继电器的目的。经对比试验验证,该拉闸方式对磁保持继电器触点有着更好的保护,将损伤降到一个相对较低的水平。Magnetic latching relay which has switch function in the electronic Watt-hour meter plays an important role in the power filed. But the trip under the condition of the large current can cause the injury of the magnetic latching relay contactor. Contactor can＇ t be open normally after multiple injury, and even cause fire. Combined with the actu- al load situation and the operating principle of the energy meter, this paper presents a soft arc suppression design means to achieve the zero current crossing trip and to protect the magnetic latching relay from injury caused by large current. Through comparative experiments, the zero crossing trip has the advantage of protecting magnetic latching relay in a better way and reduces the damage to the lower level.

关 键 词：磁保持继电器 过零拉闸 电弧 触点 

分 类 号：TM933[电气工程—电力电子与电力传动]