Design And Implementation Of The Power Systems Dynamics Recording Devices

The trend of today's power system is continuous network expansion and LAN interlink. The performance of power system becomes increasingly complicated, which requires high-performance distributed fault diagnosis system to analyze system faults. The paper introduces a detailed embedded dynamic recording device -- Intelligent Electronic Device (IED), which meet the demand of distributed fault diagnosis system. The main function of IED includes data acquisition, fault-startup criterion and network correspondence. The management computer is in charge of the data analysis. IED adopts the design method of the distributed module, can be installed dispersedly in cabinet or be linked to a management computer, and it can transfer data to far control center via 10 M/100M Ethernet. The IRIG- B decoding device can receive IRIG-B code synchronous clock signals and Pulse Per Second (PPS). The CPLD hardware data acquisition controller ensures the sample time accuracy in the system. The system realized the goal of 10kHz sampling speed with 16bit analog-to-digital converter. The system uses 64k dual port RAM to keep the 136ms historical data as the circular buffer. It uses the CF card to save the recording data. The system adopts Multi-task operate system uClinux, which has perfect network supports. It is designed that the application software can be convenient carried out on it. It is not a real-time operating system because of uClinux, so the RTlinux patch improves the real-time performance of the system. At present, the hardware system designing and debugging of IED has been finished, the uClinux operating system transplanting has already finished. And the expected target has been reached.