Fault recorder is an important automatic device to record the changes of various electrical quantities in the whole dynamic process when the power system fails or vibrates. With the rapid development of substation power grid construction, it plays an important reference role in fault diagnosis and recovery.

        The fault recording device mainly records the voltage, electric flow and some derived quantities, such as active power, reactive power and other related electrical and non electrical quantities. Fault recording data is the main basis for diagnosing the fault nature and causes in substation. It has great reference value for improving power grid security and optimizing power quality.

        At the same time, a series of fault recording data, waveform diagram and some important recording data recorded and provided by the fault recorder have made important contributions in analyzing the cause of the accident, identifying the specific fault section, specifying accident prevention countermeasures, evaluating relay protection and restoring power supply. Moreover, the data of fault recording can also help technicians understand the specific operation and fault conditions of power system, and help technicians study the law of fault recording.

        The fault recorder is an important automatic device for the safe operation of power system. When a fault or shock occurs, it can automatically and truly record the changes of various electrical quantities in the whole process.