Distributed optical fiber-based transformer winding stress monitoring system

Abstract

The invention belongs to the technical field of on-line monitoring systems, in particular to a transformer winding stress monitoring system based on distributed optical fibers. It is characterized in that the system includes pre-embedding several fully distributed optical fiber stress sensors (1) in the electromagnetic wire of the high voltage winding (3), and each fully distributed optical fiber stress sensor (1) is connected together by an optical fiber (2), Fix it by the clamping device (4), and then lead the optical fiber (2) out of the fully distributed optical fiber stress sensor (1) and connect it to the high-speed demodulation system, and the output end of the high-speed demodulation system is connected to the stress acquisition system to realize the stress measurement of the transformer winding. Real-time monitoring; the whole set of stress monitoring system can realize the rapid detection and distributed measurement of winding stress, and accurately grasp the stress conditions of different positions of the winding under the action of impact force, which overcomes the shortcomings of insufficient resolution of existing demodulators. The distributed monitoring of the fast electromotive force of the winding is realized.

Description

technical field [0001] The invention belongs to the technical field of on-line monitoring systems, in particular to a transformer winding stress monitoring system based on distributed optical fibers. Background technique [0002] Power transformers are an important part of power systems. The transformer winding in operation will establish axial and radial leakage flux around it. When a short-circuit fault occurs or is impacted by lightning current, the large current flowing through the winding will cause the electromagnetic force on the winding to increase dramatically. After the winding is affected by the impact force, it will cause axial and radial dimension changes, winding distortion, bulging, etc., that is, winding deformation. The deformation of the winding may cause the insulation distance to change or the insulation paper to be damaged. When encountering lightning overvoltage, the transformer will break down between turns and cakes, and sudden damage accidents will ...

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Problems solved by technology

[0003] At present, the domestic research on the axial and radial stress of transformer windings mainly adopts the theoretical calculation method, but due to the complex structure of the transformer, the calculation errors of related parameters such as current density, and the leakage flux of the winding as an elastic system is a coupling field under the impact force, There is still a large gap between the theoretical calculation results and the actual winding stress, which cannot provide support for the judgment of transformer winding deformation

At the same time, due to the intrusion wave of electromotive force generated on the winding and the short-circuit current has a high frequency, the existing demodulator cannot demodulate the signal, resulting in the difficulty that the analysis end cannot be synchronized with the detection end

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