基于陷阱密度谱特征量的油纸绝缘变压器老化诊断

发布时间：2018-02-03 15:23

本文关键词： 时域检测陷阱密度谱去极化电流法峰值时间常数糠醛检测质量浓度油纸绝缘老化状态　出处：《高电压技术》2017年08期 　论文类型：期刊论文

【摘要】：变压器油纸绝缘老化是影响变压器正常运行的重要因素。现阶段,基于时域检测的去极化电流法被广泛应用于变压器油纸绝缘状态诊断,但对于去极化电流谱线的特征量提取仍处于初始阶段。根据介电响应和陷阱理论,提出绘制去极化陷阱密度谱,并从中提取峰值大小S_(max)和峰值时间常数T_(max)这两个新特征量,用以评估变压器油纸绝缘老化状态。首先采用不同极化电压测试,分析去极化陷阱密度谱线新特征量与极化电压间的关系。其次对检测出不同糠醛质量浓度的绝缘油纸变压器的陷阱密度谱线作对比分析。最后对大量变压器实例进行验证分析。研究结果表明:峰值大小S_(max)与糠醛检测质量浓度呈正相关,峰值时间常数T_(max)与糠醛检测质量浓度呈负相关;随着油纸绝缘老化程度的加深,陷阱密度谱的特征量S_(max)逐渐增大,而特征量Tmax逐渐减小;所提出的两个特征量取值范围可作为今后诊断变压器油纸绝缘老化状态的依据。
[Abstract]:The aging of transformer oil paper insulation is an important factor affecting the normal operation of transformer. At present, depolarization current method based on time domain detection is widely used in transformer oil paper insulation condition diagnosis. However, the characteristic extraction of depolarized current lines is still in the initial stage. According to the dielectric response and trap theory, draw the depolarization trap density spectrum. Two new characteristic variables, the peak value SIM max) and the peak time constant T max), were extracted from them to evaluate the ageing state of transformer oil paper insulation. First, different polarization voltages were used to measure the aging state of transformer oil paper insulation. The relationship between the new characteristic of depolarization trap density line and polarization voltage is analyzed. Secondly, the trap density spectrum of insulating oil-paper transformer with different furfural concentration is compared and analyzed. Finally, a large number of transformer examples are given. The results show that:. Peak value SSP (. Max-) was positively correlated with the detected mass concentration of furfural. There was a negative correlation between the peak time constant and the detection mass concentration of furfural. With the aging degree of oil-paper insulation deepening, the characteristic value of trap density spectrum (S _ S _ (max)) increased gradually, while the characteristic value Tmax decreased gradually. The range of the two characteristic values can be used as a basis for diagnosing the ageing state of transformer oil-paper insulation in the future.
【作者单位】：福州大学电气工程与自动化学院;
【基金】：国家自然科学基金(61174117)~~
【分类号】：TM855
【正文快照】： 0引言1电力变压器是电网电能传输的枢纽设备。为保证电力变压器稳定运行,其内部油纸绝缘系统起到至关重要的作用[1]。变压器内部绝缘由绝缘矿物油和绝缘纸等材料组成,随着运行年限的增加,油纸绝缘系统的老化程度不断加深[2],将严重影响绝缘系统的稳定性,危及电力的正常传输。

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