光纤互感器检测电路分析与设计

Analysis and design of optical current transformer's detection circuit

光纤电流互感器检测电路是实现计量大电流的载体,也是光纤电流互感器向变电站通信网络的传输信息的转接点,为电力控制中心对变电站实施监测、计量、控制和保护提供了信息通路。在理解和遵循IEC61850协议的基础上,分析光学互感器的信号和生存环境特性,设计了以TI的TMS320F2812为核心处理器,包括滤波、采样、时钟同步等模块的高精度、高稳定性、高可靠性的光学互感器检测电路实现方法;经测试其精度达到0.2s级。

Detect circuit of optical current transformer is the carrier of achieve high current measurement,and also is an information transfer points for current transformer to the substation communication network.It provides the power control center for the implementation of substation monitoring,measurement,control and protection with a communication channel.Based on understanding and following the IEC61850 protocol and the analysis of optical current transformer signals and its living environmental characteristics,a digital interface is proposed,with high-precision,high stability and high reliability which employed TI＇s TMS320F2812 as core processors,including filtering,sampling and clock synchronization module;and its accuracy reaches 0.2 S.