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电能表的组成和常见预存方法

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电能表的组成和常见预存方法


       电能表由两个主要功能组成:一是电能计量部分,采用专用的集成电能计量芯片将电压和电流的采样信号进行计算,产生代表电能的计量脉冲直接用于电能误差校验,并同时给MCU 的功能处理部分进行电能计数;二是微处理器MCU 控制部分,根据计量部分的电能脉冲进行电能计算,并通过射频卡接口进行数据交换,同时采用宽温度范围的LCD进行显示,并按设定参数控制磁保持的继电器对用户用电进行控制。


电能表常见预存方法;


预存方法有两种,一种为代码式,一种为写卡式。

代码式原理为:管理系统将用户信息和购电信息结合起来生成一组加密代码,并交给用户自己输入到电表中,电表经过正确解密后得到预存电量或金额并保存。

写卡式:将预购电量或金额写入专用电子卡中,交给用户持电子卡到对应电表上进行通讯,预购值自动送入电表中。


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