A distribution network line fault recording device and fault recording method thereof

Abstract

The invention discloses a fault recording device for a distribution network line, which comprises a DMA module, a non-volatile storage device and two ring buffer areas. The invention also discloses a fault wave recording method. In the present invention, when there is no fault or abnormality in the power system, the collected data is temporarily stored in a circular buffer area without CPU intervention, which effectively saves CPU memory space; when a line fault or abnormal operation is detected, the fault data Pointing from this ring buffer to another newly opened ring buffer prevents valid data from being overwritten and reserves enough time for the CPU to broadcast fault information. At the same time, double buffers are switched periodically to avoid complex boundary data processing operations.

Description

Technical field [0001] The invention relates to a power system distribution network line fault detection device and method, in particular to a distribution network line fault recording device and method based on a double ring buffer. Background technique [0002] The fault recorder is a device that can automatically record when the power system fails and oscillates. It can record the system current, voltage and their derived quantities due to short-circuit faults, system oscillations, frequency collapse, voltage collapse and other large disturbances, such as active power , Reactive power and system frequency changes throughout the process. When the power system fails, the data recorded by the fault recorder is used to analyze the cause of the fault, monitor the operation of relay protection and safety automatic devices, and observe the entire history of the development of the fault, which is an important basis for avoiding similar accidents from happening again. When a fault occ...

AI Technical Summary

Problems solved by technology

Once an abnormality occurs, the fault recording device records a large amount of information. When the collected data is continuously updated, the buffer area is continuously increased, which will cause the CPU system memory resources to be continuously consumed. When the memory is exhausted, the CPU unit will crash; When the collected data is continuously updated, a fixed-size buffer is adopted. Due to a certain delay in the communication between lines A, B, and C due to failure or abnormality, valid data will be overwritten; the single-ring buffer method needs to be frequently updated. Boundary data is operated, the implementation process is relatively complicated, and the integrity and validity of the data cannot be guaranteed

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