Developed Based On The Distribution Of The Fiber-optic Communications - Collection Fault Recorder System

The electric power system is becoming a large scale system. The system would be much more complicated with the development of interconnection. Fault recording system is very important for electric power systems, and it had played important role in analyzing the performance of electric power systems.From actual requirement, a new fault recording system is proposed based on fiber optical communication. The sampling unit is distributed on different bays, and is connected to main system with fiber optical cable. The system can reduce the quantity of cable in substation, and reduce the cost. The EMC performance of fiber cable is better than common cable, so it can improve the communication reliability remarkably. At the same time, due to distributed design, one sampling unit damage will not affect the other unit, so the reliability of whole recording system will be improved.The sampling system adopt module design, different function is distributed in different module. DSP and multi-CPU technique are proposed in the design, and TMS320C32 and CPLD are used in the circuit. The function realized by different module is described in the thesis in detail. The software is built on the embedded real-time multi-task operating system, and is based on component software structure, so the software reliability is improved and guaranteed the excellent performance of the recording system.To improve the measure precision, the least square method is used to compute the analog channel ratio. The test demonstrates the method is correct and can improve measure precision greatly.