Online monitoring system for power transformer winding vibration signals

Abstract

The invention provides an online monitoring system for power transformer winding vibration signals. The online monitoring system comprises a signal amplifying circuit, an A / D (analog-digital) conversion circuit, a level conversion circuit and a signal processing module which are sequentially connected with a vibration acquisition module, the signal processing module and a man-machine interaction unit are connected with each other and then respectively connected with a PC (personal computer) through a communication module, the signal processing module computes vibration energy of different frequency bands of the power transformer winding vibration signals, the vibration energy of the frequency bands is compared with an energy threshold value by the PC, and a failure winding phase in a power transformer is judged. Compared with the prior art, the online monitoring system for the power transformer winding vibration signals can online monitor the vibration signals when the transformer is short-circuited in real time, acquired data are synchronously uploaded to the PC, a diagnosis result is displayed through a display module, and the online monitoring system gives the alarm in real time to explain the running state of a transformer.

Description

technical field [0001] The invention relates to a vibration signal monitoring system, in particular to an on-line monitoring system for power transformer winding vibration signals. Background technique [0002] As one of the most important hubs of the power system, the safe operation of the power transformer is directly related to the safety and reliability of the power generation and power supply system. Therefore, the fault detection, maintenance and repair of the transformer are important tasks to ensure the normal operation of the power supply system. [0003] At present, the main methods used to detect the deformation of transformer windings are: short-circuit test method, low-voltage pulse method, frequency response method, etc. These methods all require the transformer to be out of operation. Regardless of the actual situation of the transformer, excessive maintenance and unnecessary shutdown may occur, and the transformer winding defect cannot be found in time. When...

AI Technical Summary

Problems solved by technology

[0004] The existing transformer vibration monitoring system has complex hardware circuits and poor anti-interference ability

Data processing is mostly based on traditional analysis methods, such as amplitude domain analysis, fast Fourier transform and correlation analysis, etc., which cannot display the change of vibration energy at each frequency over time in real time

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