Fault recorder is the local power system fault or abnormal circumstances, voltage, current data records and related protection and safety automatic device action sequence records, fault recorder recorded waveform, through the analysis and comparison of these electrical quantities and waveforms, can correctly determine the exact location of power system fault, development process and fault type, in order to quickly arrange In addition to the fault and develop preventive measures, analysis of relay protection and high voltage circuit breaker action, timely discovery of equipment defects, reveal the problems existing in the power system.

Fault recorder can be divided into line type fault recorder, transformer type fault recorder and generator transformer group type fault recorder.

Considering the importance of large power plants, independent fault recording devices should be installed for generator transformer units and transformers or lines with voltage levels above 110kV.

Generator transformer set is generally equipped with 96 analog signals and 192 switching signals. Starting transformer fault recording or line type fault recording is generally equipped with 64 channel switching signal and 128 channel switching signal. Switch and analog signal data should be configured according to engineering needs.

The fault recording is started by the short-circuit fault electric quantity or non electric quantity of the recorded object, such as gas, temperature, etc., and the switching value of the main protection action is recorded. At the same time, the waveforms before and after the fault starting and when the system vibrates are recorded. It can also be started manually or remotely.

The generator transformer fault recording panel and transformer type fault recording panel are installed in the electronic equipment room of the main power house, and the line type fault recording panel is arranged in the relay room of the booster station.