Oil-immersed power transformer winding monitoring method and device

Abstract

The invention discloses an oil-immersed power transformer winding monitoring method and device. The method comprises the steps of: respectively acquiring one set of output signals of a first distributed optical fiber pressure sensor, one set of output signals of a second distributed optical fiber pressure sensor and one set of output signals of a third distributed optical fiber pressure sensor at the moment i; judging whether the variation of two continuous sampling points in only one set of output signals among the three sets of output signals is greater than a preset threshold value or not; if not, outputting a recording signal, wherein the recording signal is the obtained each set of output signals; if the judgment result is yes, respectively acquiring a set of output signals of the first distributed optical fiber pressure sensor, a set of output signals of the second distributed optical fiber pressure sensor and a set of output signals of the third distributed optical fiber pressure sensor at the moment i+1, and carrying out subsequent judgment steps; and when the (i+m)th judgment result is yes, outputting a tripping signal, wherein m is larger than or equal to 1. And the stress change condition of the winding bottom can be timely and accurately reflected, and main transformer winding state evaluation and fault diagnosis can be carried out on site.

Description

technical field [0001] The present application relates to the technical field of transformer monitoring, in particular to a method and device for monitoring windings of oil-immersed power transformers. Background technique [0002] Due to the dispersion of the production process or the through current during operation, there is a misalignment problem between the bottom of the winding of the oil-immersed power transformer and the support bar between the iron core, resulting in a small support area at the bottom of the winding, winding instability, winding bottom turns There is a risk of short-circuit failure due to insulation damage. [0003] Knowing the force distribution at the bottom of the transformer winding in time and taking corresponding control measures can ensure the safe and stable operation of the equipment and improve the power supply reliability of the power system. At present, the methods for detecting the winding state of oil-immersed power transformers are m...

AI Technical Summary

Problems solved by technology

At present, the methods for detecting the winding state of oil-immersed power transformers are mostly blackout detection methods, such as frequency response method and low-voltage short-circuit impedance method. On-site power failure needs to implement regulations, which often leads to failure to detect winding state in time for power failure; and it can only reflect In the case of large deformation or displacement of the winding, it is difficult to accurately evaluate the state of the winding when the historical detection data of the same-phase winding is missing or the time span is large

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