Method for processing vibration signal on surface of oil tank of power transformer

A power transformer, surface vibration technology, applied in the direction of instruments, using electrical devices, using electromagnetic means, etc., can solve the problems of high signal independence requirements and difficulty in applying traditional blind source separation technology
CN110132401AInactive Publication Date: 2019-08-16STATE GRID CORP OF CHINA +2
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Patent Information

Authority / Receiving Office
CN Β· China
Current Assignee / Owner
STATE GRID CORP OF CHINA
Publication Date
2019-08-16
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

The invention relates to a method for processing a vibration signal on the surface of an oil tank of a power transformer. The method comprises the steps of a) firstly collecting the vibration signal on the surface of the oil tank of the power transformer; b) selecting vibrations x1, j(n) and x2 at a measuring point j on the wall of the oil tank under an approximate voltage condition and differentload conditions, and taking the j(n) as a signal separation object; c) using a time-frequency ratio hybrid blind source separation algorithm for the signal, estimating a hybrid matrix, and obtaining aseparated signal; and d) calculating the separated signal to be compared with the vibration in a no-load state of the measuring point, and calculating a normalized mean square error (NMSE) between the separated signal and the vibration of the measuring point in the no-load state. According to the method, the initial judgment can be provided for equipment maintenance, so that the occurrence rate of major accidents is reduced, the maintenance quantity and the maintenance cost of equipment are reduced, and the normal operation of the power transformer is ensured.
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Description

Technical field

[0001] The invention belongs to the technical research field of power transformer fault diagnosis based on vibration signal detection, and in particular relates to a method for processing vibration signals on the surface of a power transformer oil tank. Background technique

[0002] With the development of the national economy and the progress of urbanization, distribution transformers have been widely used in urban areas. Ensuring the safe and reliable operation of this type of transformer has become an important task for the power supply department. Analyzing and mastering the vibration characteristics of this type of transformer under different working conditions has important guiding significance for daily inspection and fault diagnosis. Realizing the monitoring and evaluation of the winding and iron core condition in transformer monitoring is very necessary and important for timely discovering hidden dangers and prolonging the life of the transformer. The tr...

Claims

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