Device and method for recording fault waveforms of power distribution lines

Abstract

The invention discloses a device for recording fault waveforms of power distribution lines. The device comprises a DMA (direct memory access) module, a nonvolatile memory device and two annular cache regions. The invention further discloses a method for recording the fault waveforms. The device and the method have the advantages that acquired data can be temporarily stored in one annular cache region without intervention of a CPU (central processing unit) when power systems are free of faults or anomaly, so that memory spaces of the CPU can be effectively saved; the fault data can be pointed to the other newly developed annular cache region from the annular cache region when the lines have faults or abnormal running of the lines is detected, so that effective data can be prevented from being covered, and sufficient time can be reserved for the CPU to broadcast fault information; double caches can be switched over periodically, and accordingly complicated boundary data processing operation can be omitted.

Description

technical field [0001] The invention relates to a fault detection device and method for a power system distribution network line, in particular to a fault recording device and method for a distribution network line fault based on a double-ring buffer. Background technique [0002] The fault recording device is a device that can automatically record when the power system fails and oscillates. It can record the system current, voltage and its derivatives caused by large disturbances such as short-circuit faults, system oscillations, frequency collapse, and voltage collapse. , reactive power and the whole process change phenomenon of system frequency. When a fault occurs in the power system, the data recorded by the fault recording device is used to analyze the cause of the fault, monitor the operation of relay protection and safety automatic devices, and observe the entire process of fault development, which is an important basis for avoiding similar accidents from happening a...

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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