基于简支绕组横梁算法的变压器绕组形变矢量化监测模型

doi:10.19595/j.cnki.1000-6753.tces.240264

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摘要

绕组状态监测是变压器监测的重要研究内容,为实现精确的绕组变形方向与变形程度的监测,该文结合简支横梁原理与布里渊光时域分析技术,提出了针对变压器绕组的形变矢量化监测算法。基于材料力学理论推导,建立了布里渊频移量与绕组形变轴向、径向分量关系式,利用布里渊光时域分析技术建立了变压器绕组形变矢量化监测模型。通过对光纤复合导线和内置光纤的35 kV绕组施加轴向形变和径向形变,借助布里渊光时域反射技术完成了形变监测,验证了监测模型的准确性。结果表明,复合导线实验中轴向形变测量误差为6.59%,径向形变测量误差为5.88%;内置光纤的35 kV绕组实验中轴向形变误差为9.63%,径向形变误差为5.04%,验证了绕组形变矢量化监测模型的可行性,实现了绕组形变方向和形变程度监测,有效地提高了绕组形变程度的监测精度。

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关键词 ：绕组形变, 矢量化监测, 光纤传感, 简支绕组横梁

Abstract：

Winding deformation is one of the important causes of transformer failure and is the focus of transformer condition monitoring. To achieve accurate monitoring of the direction and degree of transformer winding deformation, this paper combines the principle of a simple beam with the Brillouin optical time-domain analysis technique and proposes a vectorized monitoring algorithm for transformer winding deformation.
Firstly, based on the theoretical derivation of material mechanics, the Brillouin frequency shift of axial deformation is proportional to the distance from the optical fiber to the neutral axis, and the Brillouin frequency shift of radial deformation is equal to the law, and the relationship between the Brillouin frequency shift and its axial and radial components is established, and the Brillouin optical time-domain analysis is combined to establish a vectorized monitoring model of the deformation of transformer windings that can be used in actual operation.
The vectorized fiber optic sensors are designed, and the fiber optic composite conductor model is built on a single conductor. 5 sets of axial and radial deformations of different degrees are applied by a high-precision tensile machine, and the deformation monitoring is completed with the help of the Brillouin optical time-domain reflection technology, and the result verifies that the conductor is subjected to the bulging and upward deviation as the positive strain, and the depression and downward deviation as the negative strain, and the coordinate system of the direction of deformation is constructed, and the deformation direction determination can be achieved by the demodulation result. The deformation direction can be determined by the demodulation results, calculating the experimental error of the conductor axial deformation monitoring error average value of 6.59%, radial deformation monitoring error average value of 5.88%, the analysis of the error caused by the high-precision press slight jitter and uneven application of the epoxy resin adhesive, but demodulation effect is generally good, to achieve the deformation of the fiber optic composite conductor direction and degree of monitoring.
To effectively prevent the fiber optic offset caused by vibration when the transformer is running without changing the internal insulation structure of the transformer, the fiber optic is fixed on the coil by using epoxy resin and insulating paper specially designed for transformers, and the 35kV winding model with built-in vectorized fiber optic sensor is successfully tested, and the deformation monitoring of the windings is completed by applying six groups of axial and radial deformation of different degrees by human beings, and by using the time-domain reflection technology of Brillouin light. The deformation of the winding is monitored by Brillouin's optical time-domain reflection technique. The experimental results show that the mean value of the monitoring error of axial deformation is 9.63%, and the monitoring error of radial deformation is 5.04%, which is mainly caused by the uneven force when applying the force as well as the equipment acquisition error, and the error tends to be stabilized after the deformation is increased, and the experimental results effectively verified the feasibility of the vectorized monitoring model of the winding deformation, and realized the direction of the deformation of the transformer and the degree of demodulation of the deformation, which further improves the monitoring accuracy of the winding deformation. The monitoring accuracy of winding deformation is further improved.

Key words： Winding deformation vectorized monitoring optical fiber sensing simply supported winding beam

收稿日期: 2024-02-17

PACS:

TM41

基金资助:

中央高校基本科研业务费专项资金（2023MS106）和南方电网公司科技项目（031900KK52220012）资助

通讯作者: 范晓舟男,1990年生,工程师,研究方向为电气设备在线监测及故障诊断。E-mail：fxz@ncepu.edu.cn

作者简介: 袁洁平女,1999年生,硕士研究生,研究方向为电气设备在线监测及故障诊断。E-mail：3300871720@qq.com

引用本文:

范晓舟, 袁洁平, 薛峰, 王湘女, 律方成, 耿江海. 基于简支绕组横梁算法的变压器绕组形变矢量化监测模型[J]. 电工技术学报, 0, (): 2492917-2492917. Fan Xiaozhou, Yuan Jieping, Xue Feng, Wang Xiangnü, Lü Fancheng, GengJianghai. Vectorization Monitoring Model of Transformer Winding Deformation Based on Simply Supported Winding Beam Algorithm. Transactions of China Electrotechnical Society, 0, (): 2492917-2492917.

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https://dgjsxb.ces-transaction.com/CN/10.19595/j.cnki.1000-6753.tces.240264 https://dgjsxb.ces-transaction.com/CN/Y0/V/I/2492917

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