Fault recorder is the basis of studying modern power grid. It can record the whole process changes of system current, voltage and system frequency caused by large disturbances such as short-circuit fault, system oscillation and power grid collapse. It is an important data to evaluate the action behavior of relay protection and analyze the nature and causes of equipment faults. It plays an important role in ensuring the safe operation of power system and improving power quality.

        Fault recorder is an important equipment to automatically record the occurrence, evolution and recovery of power system accidents and shocks. It can record all electrical quantities for a long time and continuously, realize the unified analysis and display of the whole steady-state and dynamic process, and embed the whole system unified, accurate and absolute time scale synchronized with GPS satellite signals in the data center to meet the needs of power system fault analysis and power system stability analysis.

        The functions of analysis mainly include: analyzing the causes of accidents and studying countermeasures, evaluating the work of relay protection and automatic device, testing the action behavior of relay protection and safety automatic device, finding fault points, finding primary equipment defects, eliminating hidden dangers in time, and finding defects of relay protection and automatic device, so as to improve and perfect the device Provide switching fault and non full phase operation re fault data, study Internal Overvoltage of power system, measure system parameters, and analyze and study system oscillation.