Transformer winding stress monitoring device and monitoring method thereof

Abstract

The invention discloses a transformer winding stress monitoring device, which comprises a first fiber, fiber stress sensors, a second fiber, a broadband light source, a wavelength division multiplexing device, a photoelectric detector, a signal amplifier, a signal processor and a display screen. An electromagnetic wire of a transformer winding is internally provided with the first fiber, and the first fiber is provided with the plurality of fiber stress sensors, so that a plurality of points on the transformer winding can be monitored, quick detection and distributed measurement of the transformer winding can be realized, and stress information of the transformer winding at different positions can be accurately known under the function of impact force; through the arrangement of the signal processor and the display screen, real-time analysis and display of quick impact force of the winding can be realized; and each fiber stress sensor is internally provided with a first grating and a second grating to obtain overall information of stress and temperature and temperature information respectively, and thus the problem of temperature cross-sensitivity when carrying out stress monitoring on the transformer winding is solved.

Description

Technical field: [0001] The invention belongs to the technical field of transformer monitoring in power systems, and in particular relates to a transformer winding stress monitoring device and a monitoring method thereof. 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...

AI Technical Summary

Problems solved by technology

[0003] At present, the axial and radial stresses of power transformer windings at home and abroad are mainly calculated theoretically, 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 coupled under the impact force. field, 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 demodulation device cannot demodulate the signal, resulting in the difficulty that the analysis end cannot be synchronized with the detection end

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