Fault recording device is mainly used in power plant, 220kV and above substation and 110kV important substation. It is convenient to analyze the action of power system fault and relay protection and safety automatic device in the process of accident, and quickly judge the location of line fault.

Fault recorder can correctly analyze the cause of the accident and provide an important basis for timely handling the accident. According to the data or waveform of fault record, the value of primary current and voltage can be calculated, and the location of fault point can be calculated, which greatly reduces the scope of line inspection, saves time and effort, and plays an important role in the rapid recovery of power supply.

According to the recording data, we can correctly evaluate the working conditions of relay protection and automatic devices (correct action, misoperation and refusal to operate), especially in case of conversion failure, the accurate data provided by the device can help to find out the shortcomings of relay protection and automatic devices, which is conducive to further improvement and perfection of these devices. At the same time, the actual record of the circuit breaker (tripping, closing time, refusing to move, jumping, breaking, etc.) can find the problems existing in the circuit breaker and eliminate the hidden danger.

From the electric quantity curve of the fault recording graph, we can clearly understand the fault; Understand the operation of the power system, and determine the cause of the accident, to provide a basis for timely and correct handling of the accident. The fault recorder can measure some parameters which are difficult to be obtained by ordinary experimental method, and provide reliable data for relevant calculation of the system.

The fault recorder has 96 analog signals, 192 switching signals, and 256 fault recording screens composed of two fault recording screens. It has the characteristics of flexible expansion and relatively independent operation.