目前，国家电网使用的智能电能表有70％以上为内置负荷开关电能表，负荷开关作为电能表的关键元器件，对电能表的工作可靠性有着重要影响，本文对现有智能电能表的负荷开关做出综合分析，并结合现有智能电能表的实际使用环境，描述了一种适合智能电能表的基于电机式自保持继电器。使用本文描述的电机式自保持继电器设计的智能电能表，符合国家电网的最新要求，使用200mT永久磁铁对电能表施加恒定磁场干扰时，电能表正常工作，并能够常进行拉合闸操作。%Nowadays, more then 70%of the smart meters with internal load switch are purchased by State Grid Cor-poration of China.The internal load switch, as the key component in the smart meters, plays an important effect on the working reliability of electric meter.This paper makes a comprehensive analysis on the existing internal load switch and introduces a latching relay based on internal motor for smart meter combining with the real condition of ex-isting smart meter.This type of smart meter satisfies the latest requirements of State Grid Corporation of China, and works properly under the condition of 200mT magnetic field interference environment, and can often make brake con-trol operation.
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