Distributed optical fiber-based transformer winding stress monitoring system

Abstract

The invention belongs to the on-line monitoring system technical field and relates to a distributed optical fiber-based transformer winding stress monitoring system. The distributed optical fiber-based transformer winding stress monitoring system is characterized in that a plurality of fully-distributed optical fiber stress sensors (1) are pre-embedded in electromagnetic wires of a high-voltage winding (3); the fully-distributed optical fiber stress sensors (1) are connected together by an optical fiber (2) and are fixed through clamping devices (4); the optical fiber (2) is led out from the fully-distributed optical fiber stress sensors (1) and is connected with a high-speed demodulation system; the output end of the high-speed demodulation system is connected with a stress acquisition system; and therefore, real-time monitoring of the stress of the transformer winding can be realized. With the distributed optical fiber-based transformer winding stress monitoring system adopted, rapid detection and distributed measurement of the stress of the winding can be realized; stress conditions at different positions of the winding can be mastered accurately under the effect of an impact force; the defect of low resolution of an existing demodulation instrument can be eliminated; and fast distributed monitoring of the electromotive force of the winding can be 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 ...

AI Technical Summary

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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