The research on a new fault wave recording device in generator-transformer units

This paper presents a new kind of distributed fault recorder including the design of the system structure, the hardware and software design of the recorder. The recorder adopts NI CompaceRIO series programmable automation controller (PAC) in the hardware while virtual instrument technology in the software. The network communication based on TCP/IP between the client and the server is adopted in the power plant. Moreover, an improved frequency tracking algorithm is presented in the monitoring of the electric quantity to improve the detection precision and the processing speed. The detection and operation results show that it has improved the performance greatly and realized authenticity, integrity and reliability and so on.