Electric power has become the fundamental guarantee of economic development. It is particularly important to analyze and deal with power failure and reduce power outage time. As an indispensable tool for substation, fault recorder provides scientific basis for staff to analyze and process fault information of power system.

According to the waveform recorded by the fault recorder, the staff can correctly analyze and judge the exact location, development process and fault type of power system, line and equipment fault, so as to quickly eliminate the fault and formulate preventive countermeasures. Analysis of relay protection and high voltage circuit breaker ground action, timely detection of equipment defects.

When the system fails, the relay protection device acts correctly. The fault line can be located by the current and voltage recorded by the fault recorder, which can help the line patrol personnel to find the fault point as soon as possible, and take measures in time to shorten the outage time and reduce the loss.

The cause of the switch tripping can be determined by analyzing the waveform recorded in the fault recorder. Therefore, the corresponding measures are taken to restore the transmission line or power outage for maintenance, so as to avoid more losses caused by blind forced transmission, and provide the basis for maintenance strategy.

Judge the action behavior of relay protection device. When the system trips without fault or the system has fault but the protection device refuses to operate due to the misoperation of relay protection device, it is necessary to judge whether the protection action is correct by using the switching value action recorded in the fault recorder, and then the problem part can be obtained. For the more complex fault, the fault amount can be calculated by the recorded current and voltage Quantitative assessment of protection.