本文提出由设备网,控制网,电力以太网三级诊断网络构建电力设备诊断平台,描述 了其结构和功能。详细介绍了基于dsPIC30F 的现场诊断装置的软硬件结构,双CPU 结构的任务模型及模拟量的采集方法;最后对诊断平台的网络接口也作了讨论。该诊断平台经过实验证明,工作可靠,满足对电力设备在线诊断的技术要求。 关键词:诊断网络,dsPIC30F,双CPU 结构; Abstract:Fault diagnosis system of power device, which is build in device-net、 control-net、 power eth-net is given in the paper, and the structure & function are also described. The hardware and software of the diagnosis& monitor instrument based on the Dspic30F are provided, including task-model of the double –CPU, the technique of sampling to the analogy. In addition, the net-interface of diagnosis system was discussed. Practice in lab show: the system reliability, the function to on-line fault diagnosis of the power device is satisfied.