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Fault zero time judging method and fault zero time judging device based on recording data

A technology for recording wave data and judging devices, which is applied to measuring devices, instruments, measuring electronics, etc. It can solve problems such as the inability to locate a certain point and require high processing capabilities of the processor, and achieve the effect of improving the computing speed

Active Publication Date: 2017-03-08
XUCHANG XJ SOFTWARE TECH +3
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Problems solved by technology

[0004] In the prior art, the Fourier algorithm or wavelet technology is commonly used to identify the zero moment of the fault, but there are corresponding problems. For example, the Fourier transform can only reflect the overall nature of the singularity of the signal, and cannot specifically locate the defect at a certain point; Although the wavelet technology can realize the accurate positioning of the signal mutation point, it requires a higher computing power of the processor

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  • Fault zero time judging method and fault zero time judging device based on recording data

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Embodiment Construction

[0030] The invention provides a fault zero-time judgment method and device based on wave recording data, which can quickly realize accurate positioning of signal mutation points.

[0031] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0032] Such as figure 1 Shown, method of the present invention comprises the steps:

[0033] 1) When there is a disturbance in the power system and the data monitored by the device meets the set value, start wave recording and save the data before and after the system disturbance;

[0034] The data before and after the disturbance are the main data, and the highest sampling frequency is adopted uniformly;

[0035] In addition, the data storage time before and after the disturbance can be set, and the longest time before the disturbance is set to 2 seconds.

[0036] 2) Starting from the starting point, collect the recorded wave data according to the formula

[0037] Δi(k)=[i(k)-...

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Abstract

The invention provides a fault zero time judging method and a fault zero time judging device based on recording data. When data monitored by equipment meets a set fixed value, recording is started, and the data is analyzed, diagnosed and stored. First, the starting point of analysis is determined. Then, by starting from the point, sudden change is calculated using three sampling values, and the difference result is compared with a threshold. If the number of points meeting the conditions in a cycle reaches a set number, the time corresponding to the points is judged as a fault zero time. A sudden change point of signal can be positioned quickly and accurately under the condition of improving the computing speed and reducing the computing load.

Description

technical field [0001] The invention relates to the technical field of power system automation, in particular to a fault zero-time judgment method and device based on recorded wave data. Background technique [0002] The modern power system integrates power generation, power transformation, power transmission, power distribution and power consumption, involving a wide range of components and complex structures. Therefore, when a fault occurs in the power system, it is necessary to detect the fault in time, and selectively remove the faulty component from the power system quickly and automatically to minimize the damage and ensure the rapid recovery of the fault to the maximum extent. Part of the normal operation, as soon as possible to automatically restore the power supply of the power failure part. [0003] Accurately identifying fault zero time is of decisive significance for quickly removing faults and improving the transient stability of the power system. It can shorte...

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Application Information

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IPC IPC(8): G01R31/00
CPCG01R31/00
Inventor 周晓娟李贞王兴安陈玉涛窦中山卓怀忠李燕孙航飞卜银娜王四伟张鹏远陈强杨坤
Owner XUCHANG XJ SOFTWARE TECH
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