Algorithm for microprocessor-based relay protection

Generalizing modern microprocessor-based relay protection at the power transmission line, a design of relays based on ARM processor is put forward. This device used DSP made by TI to be the protective CPU, which mainly answered for controlling data acquisition, the sampled data processing, the protective function implementation, the human interface and peripheral serial interface and Ethernet communication, and used other devices to be assistant to control sampling/holding, multi-path option switch and the I/O switching value. The system is mainly composed of several modules such as A/D samples circuit, Fourier algorithm, fault analysis system. The test results show the design of the microprocessor-based protection has good performance.