DeviceNet现场总线与对称分量法在电动机保护测控装置中的应用

Devicenet fieldbus and symmetrical components method used in motor protection measurement and control device

基于DeviceNet现场总线与对称分量法,研制了集保护、报警、测量、控制与DeviceNet通信等多项功能于一体的电动机综合保护测控装置。深入研究了DeviceNet的通信机理,提出了该装置DeviceNet通信的实现方法,构建了针对该装置的对象模型和设备描述。针对对称分量法实际应用中两种系统接地方式均采用同一滤序计算公式的问题进行了分析和讨论,给出了分别适用于大电流、小电流接地系统的滤序计算公式。

The motor protection measurement and control device based on DeviceNet fieldbus and symmetrical components method is developed. It has all functions of protection, alarm, measurement, control and DeviceNet communication. Communication mechanism of DeviceNet is studied and communication realized method of this device is offered. The object modeling and device description of this device are realized. Analysis and discuss of the problem of real application of symmetrical components about adopting same filtering sequence without considering system's grounding mode is made. The different filtering sequence formulas used in large or small grounding current system are presented separately.