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磨东变电站2号主变压器绝缘油总烃超标,结合油色谱、油介损等试验结果判断该变压器石蜡基绝缘油油质劣化。对该变压器本体的石蜡基绝缘油进行全部更换,换油后相关试验结果显示该变压器绝缘水平明显提高。 相似文献
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1概述新绝缘油中较少含有氢,使用前要用真空过滤法进行脱气和脱水,油中溶解度很小的氢非常容易被脱掉。所以,大型变压器投运前油中的氢含量通常接近于零。正常情况下,变压器投运后油中氢含量的增长速度十分缓慢。近些年来,110kV变压器投运后 相似文献
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绝缘油色谱检测对于发现变压器内部潜伏性故障有着至关重要的作用.在变压器故障中,氢气含量的变化
较为敏感.变压器受潮、局部放电,火花放电、电弧放电时,氢气含量都会增长,另外绝缘材料、金属材料中析出氢
气,绝缘漆、绝缘油种类等都会影响氢气含量变化. 相似文献
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本文主要介绍了解决变压器绝缘油介损超标的几种方法,分析了各种处理方法的优缺点,并对绝缘油的跟踪试验和技术监督提出了建议。 相似文献
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绝缘油填充于各型变压器、电力电容器等充油电力设备中,起绝缘、导热、灭弧等作用,在电力系统中有着广泛地应用。随着输电电压等级的不断提高,对绝缘油提出了更高的要求,因此提高绝缘油性能,对中国特高压发展具有重要意义。由于纳米粒子的尺寸效应,传统的小桥击穿理论可能将不再适用,为改善绝缘油的性能提供了新的途径。笔者研究了纳米绝缘油的制备方法,并对不同质量分数纳米粒子的绝缘油进行了交流击穿电压实验。研究结果表明,适当质量分数的纳米粒子能有效地改善绝缘油的交流击穿特性。应用纳米粒子球形介质极化模型,计算了粒子表面产生的势阱,并指出了纳米粒子改善绝缘油击穿特性和添加纳米粒子过多导致绝缘油的击穿性能降低的原因。 相似文献
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Sigemitsu Okabe Masanori Kotoh Motoo Tsuchie Tsuyoshi Amimoto 《Electrical Engineering in Japan》2011,176(4):26-33
The mechanism of the increase in the electrostatic charging tendency (ECT) of insulating oil and causative compounds were investigated by accelerated deterioration tests with the addition of various compounds. Although the ECT of the insulating oil was almost constant when only sulfoxide compounds were added, a marked increase was observed when either hydrochloric acid or moisture, which was considered to be generated by the aging of insulating oil, was also added to oil containing sulfoxide compounds. It is assumed that the sulfonium ion, which is generated by the reaction between sulfoxide compounds and hydrogen ion, is the compound that directly contributes to the increase in the ECT. Hydrogen ions can be supplied from organic acids generated by the oxidation of hydrocarbons in aging insulating oil. It is considered that the increase in the ECT of insulating oil is caused by the generation of sulfoxides by the oxidation of sulfide, which are present in fresh oil (originating compounds), and the generation of sulfonium ions by a reaction between sulfoxide and hydrogen ions, which are formed during aging. © 2011 Wiley Periodicals, Inc. Electr Eng Jpn, 176(4): 26–33, 2011; Published online in Wiley Online Library ( wileyonlinelibrary.com ). DOI 10.1002/eej.21113 相似文献
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简述了测量不确定度评定的意义和概念,详细介绍了测量不确定度评定方法在绝缘油溶解氢气组分含量测量中的应用。通过不确定度评定,分析测量过程中的不确定度来源,研究处理和改进方法,以进一步提高测量准确度,提高检测质量。 相似文献
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Itahashi S. Mitsui H. Sato T. Sone M. 《Dielectrics and Electrical Insulation, IEEE Transactions on》1995,2(6):1111-1116
Oil impregnated paper or polymer film is the main insulating system for many kinds of power apparatus. The oil impregnated materials, especially oil impregnated kraft paper, include a significant amount of water, and this water disturbs the insulating performance of the devices. The amount of water in the materials usually is represented by the difference in weight between the normal material and the same material after drying. However it is difficult to measure the absolute value of the water content and to determine the state in which the water exists in the materials. In this study, we examined the IR spectra of water in oil impregnated kraft paper, because the IR spectrum of the water indicates not only the amount of water but also its state. It was found that most of the water behaves as liquid water, and some as hydrogen bonded water, interacting with the paper fiber. The dc conductivity of the kraft paper depends only on the amount and state of the water associated with it whether or not the paper is impregnated with the oil 相似文献
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矿物油-天然酯混合绝缘油减缓绝缘纸热老化速率机理的XPS研究 总被引:1,自引:0,他引:1
以矿物油-天然酯混合绝缘油及25#矿物油为研究对象,对比了两种绝缘油对绝缘纸热老化速率的影响,证实了混合油对油纸绝缘老化速率起到明显的抑制作用。为了进一步分析混合油对纤维素热老化的抑制机理,本文采用X射线光电子能谱(XPS)法,对在两种绝缘油中老化的绝缘纸表面及内部的XPS碳谱(碳原子的化学态)进行了研究,并结合表征绝缘纸老化程度的传统特征量-聚合度和油中糠醛含量进行了分析。结果表明,与矿物油相比,在混合油中老化的绝缘纸产生了新的基团-酯基(O-C=O),这是混合油抑制绝缘纸热老化的主要原因。通过XPS碳谱的定量分析,发现形成酯基的碳原子主要位于纤维素链中的葡萄糖环上,为今后绝缘油和绝缘纸的抗老化改性提供了参考。 相似文献
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Nobuaki Nishimura Ryuichi Ogura Satoshi Matsumoto Maya Mizuno Kaori Fukunaga 《Electrical Engineering in Japan》2013,183(1):9-15
The stock of aged power equipment is increasing and it is important to clarify the characteristics of deteriorated insulating oil. This paper describes a basic study of molecular behavior in the oxidation of insulating oil by terahertz spectroscopy. The oxidation of insulating oil was modeled by using various compositions of dodecane and 2‐octanol. The terahertz measurements indicated that signi?cant absorption related to hydroxyl groups (‐OH) occurred between 6 and 7 THz. The absorption band was also observed in accelerated aging alkylbenzene, which is used in power equipment as insulating oil and is sensitive to hydrogen bonds. © 2013 Wiley Periodicals, Inc. Electr Eng Jpn, 183(1): 9–15, 2013; Published online in Wiley Online Library (wileyonlinelibrary.com). DOI 10.1002/eej.22335 相似文献
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在高压变压器的现场安装时,降低变压器绝缘油中含气量是一项重要环节,也是评价变压器安装质量的一项重要指标。笔者针对现场实际并经实践提出对充氮保管的变压器,在通常的安装流程中,增加连续抽真空(首次注油前)48h及以上,最终可使绝缘油中含气量有明显的下降作用。 相似文献
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为研究现场变压器换油后油中糠醛的变化规律及换油对使用油中糠醛评估绝缘纸老化的影响,在实验室对油纸绝缘样品进行130℃加速热老化,在老化的前、中、后期分别换油,对比换油前、后油中糠醛的含量。结果表明,换油后,油中糠醛大量损失;换油前、后油中糠醛含量的差值随老化时间的加长而逐渐减小;不考虑换油,直接使用油中糠醛评估绝缘纸老化会使评估结果偏高,误差在换油后初期尤其显著。定义在相同的老化时间换油后与换油前油中糠醛的比例为修正函数,研究了修正函数的变化规律,并用其对换油后油中糠醛进行修正。结果表明,使用修正函数可以有效改善换油后绝缘纸老化程度的评估效果。研究了修正函数向现场运行温度推广的方法,以利于现场变压器换油后的糠醛修正。 相似文献
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水分是电力设备油纸绝缘寿命的首要劣化因素。将太赫兹时域光谱系统(THz-TDS)引入到油纸绝缘微水含量测试中,利用太赫兹时域光谱系统对不同微水含量绝缘纸板样品进行测试,得到了不同太赫兹时域及频域响应信号结果并进行拟合,从而获得了可以初步估计纸板中水分含量的计算公式;最后结合太赫兹成像技术对纸板平面的水分不均匀分布情况进行了检测。由于水分子中的氢键在太赫兹波照射下会产生强烈的共振与吸收,在太赫兹透射波中产生明显的反馈作用,基于此原理可以将太赫兹检测技术运用于对绝缘纸板水分含量与分布的评估中。 相似文献
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分析水分、温度和放电能量3种因素对纸纤维素长链及绝缘油碳氢键的影响;对比主绝缘tanδ测定和油中溶解气体色谱分析两种诊断方法,指出单一诊断方法存在的缺陷,提出采用综合诊断对套管绝缘状态作出精确评价。 相似文献