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HIGH VOLTAGE 2024年第3期9卷 566-580页

作者： Dai, Xu Yuan, Yuan Zhou, Jiang Liu, Guoyong Zhu, Tao Xiang, Huiying Yu, Qi Gao, Xue Liao, Ruijin Chongqing Univ State Key Lab Power Transmiss Equipment & Syst Sec Chongqing Peoples R China Chongqing Univ Coll Mat Sci & Engn Chongqing Peoples R China Dongfang Elect Machinery Co Ltd Deyang Peoples R China

As a typical failure phenomenon in transformers, sulfur corrosion has garnered significant attention in the field of high-voltage engineering. Grain boundary character distribution (GBCD) copper windings have been introduced to enhance sulfur corrosion resistance by slowing down intergranular corrosion. In this study, the sulfur corrosion behaviour and mechanisms of the GBCD copper windings under various temperatures were experimentally and theoretically studied. Results show that GBCD can enhance the corrosion resistance of copper in liquid environments. With the increase in temperatures, the insulating properties of oil and papers in traditional copper windings experience notable degradation, while GBCD copper windings show more stable insulating behaviours. In addition, modelling of grain boundary energy indicates that the grain boundary structure of GBCD copper windings has a lower average interface energy of 0.170 eV/angstrom 2. Calculations of reaction thermodynamics show that GBCD copper windings possess a higher failure temperature (135.2 degrees C) and inhibition degree (activation energy) of the sulfur corrosion (32,557.62 J/mol), revealing the stability and enhanced sulfur corrosion resistance at elevated temperatures.

关键词： OIL-PAPER INSULATION DIBENZYL DISULFIDE POWER TRANSFORMERS STAINLESS-STEEL STRENGTH

Gas production mechanism of Irgamet 39 and its long‐term corrosion resistance

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High Voltage 2023年第5期8卷 931-942页

作者： Huiying Xiang Yuan Yuan Guoyong Liu Xue Gao Cheng Zhang Jiang Zhou Ruijin Liao College of Materials Science and Engineering Chongqing UniversityChongqingChina State Key Laboratory of Power Transmission Equipment&System Security and New Technology Chongqing UniversityChongqingChina Dongfang Electric Machinery Co. LtdDeyangChina

The phenomenon of transformer failure caused by oil‐sulphur corrosion of oil₋paper insulation system has always been concerned by *** 39 is the most used metal passivator for inhibiting sulphur ***,Irgamet 39 causes abnormal dissolved gas in oil during the process of exerting anti‐corrosion ***,the gas production mechanism of Irgamet 39 and its long‐term corrosion resistance were *** with other metal passivators,the Irgamet 39 produces more dissolved gases in oil,especially H_(2),CO and CO_(2).The main sources of free radicals in the gas production process are from the branched chains of the Irgamet 39 structure(−CH_(2)N(C_(8)H_(17))_(2)and−CH_(3)).Furthermore,the ageing products of insulating paper and oil promote the cleavage of the chain in the Irgamet 39 molecule,which then causes Irgamet 39 to generate more dissolved *** 39 exhibits excellent long‐term corrosion inhibition properties,while it also leads to abnormal gases in the oil,which can affect the interpretation of the dissolved gas analysis data and thus interfere with the *** work provides useful information for the practical application of Irgamet 39 and helps electrical workers make reasonable predictions for transformer problems.

关键词： corrosion resistance mechanism

A review:Research on corrosive sulphur in electrical power equipment

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High Voltage 2022年第2期7卷 209-221页

作者： Yuan Yuan Xue Gao Jiang Zhou Guoyong Liu Xiongwei Kuang Lijun Yang Ruijin Liao College of Materials Science and Engineering Chongqing UniversityChongqingChina The State Key Laboratory of Power Transmission Equipment&System Security and New Technology Chongqing UniversityChongqingChina

Corrosive sulphur has been commonly regarded as an enormous threat to electrical power equipment in recent *** sulphide(Cu2S)deposition on the insulating oil and paper insulation caused by sulphur corrosion will bring about insulation deteriorations or failures in power transformers and shunt reactors.A large number of experiments have been carried out to investigate sulphur corrosion and some measures have been come up to solve this issue such as replacement of insulating oil,chemical removal of corrosive sulphur and the addition of passivator and so ***,there has not been a perfect method to work out this problem completely,and the phenomenon of sulphur corrosion still *** paper intends to provide thorough information of corrosive sulphur in power equipment and give detailed explanations about its corrosion mechanism,hazards and control measures,which is supposed to offer a reference for subsequent researchers.

关键词： corrosion sulphur electrical

Influence of contact layer on the sulphur corrosion of copper conductors in power transformers

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High Voltage 2022年第1期7卷 176-184页

作者： Lijun Yang Dong Ding Yuan Yuan Sihang Gao Yuncai Lu State Key Laboratory of Power Transmission Equipment and System Security and New Technology Chongqing UniversityChongqingChina College of Material Science and Engineering Chongqing UniversityChongqingChina Key Laboratory of Industrial Internet of Things and Networked Control Ministry of EducationChongqing University of Posts and TelecommunicationsChongqingChina State Grid Jiangsu Electric Power Co. Ltd.Electric Power Research InstituteNanjingChina

Owing to the corrosive sulphides in the mineral insulating oil such as dibenzyl disul-phide(DBDS),copper windings in oil‐immersed transformers may suffer sulphur *** study investigates the influence of different contact conditions on the corrosion of copper conductors in ***‐immersed accelerated corrosion experiment was conducted on copper conductors with various contact materials and different layers of insulating *** surface micromorphology,deposition compo-nent and the potentiodynamic polarization characteristics of copper conductors were *** results show that copper with different contact materials suffer sulphur corrosion;conversely,bare copper rarely *** was also verified that the existence of a particular gap between copper and contact layer is a significant factor in sulphur corrosion by the formation of a concentration cell on the copper *** insu-lating paper wrapped around copper conductors does not increase the corrosion ten-dency of copper;however,it contributes to the formation of a region concentrated with DBDS,Cu^(2+),H^(+)by adsorption and impediment,which plays a key role in facilitating the sulphur corrosion of copper ***,sulphur corrosion can also occur on other metal parts in transformers when there is a particular gap on surfaces other than copper.

关键词： corrosion copper sulphur

套管中铝箔的油硫腐蚀现象及其对油纸绝缘性能的影响试验探究

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高电压技术 2019年第2期45卷 484-491页

作者：项敏袁媛何潇张成行廖瑞金重庆大学输配电装备及系统安全与新技术国家重点实验室重庆400044 重庆大学材料科学与工程学院重庆400044 云南电网有限责任公司电力科学研究院昆明650200

近年来,中国多个变电站现场的套管出现了由于腐蚀性硫化物沉积引发的故障,套管中的油硫腐蚀现象亟需得到关注和研究。为了研究套管中的"油-纸-铝箔"这一特殊结构中铝箔的油硫腐蚀问题及其腐蚀产物对油纸绝缘性能的影响,参考GB/T19291开... 详细信息

近年来,中国多个变电站现场的套管出现了由于腐蚀性硫化物沉积引发的故障,套管中的油硫腐蚀现象亟需得到关注和研究。为了研究套管中的"油-纸-铝箔"这一特殊结构中铝箔的油硫腐蚀问题及其腐蚀产物对油纸绝缘性能的影响,参考GB/T19291开展了腐蚀试验;并利用扫描电子显微镜(SEM)观察铝箔表面微观形貌变化来判断铝箔腐蚀情况,测试油中铝元素含量来判断铝箔腐蚀程度,测试绝缘油和绝缘纸的电气和理化参数等来判断铝箔腐蚀产物对油纸绝缘的影响。结果表明:铝箔在一定酸值和含硫量的绝缘油中确实会发生油硫腐蚀现象,而油纸绝缘老化产物甲酸会加剧铝箔腐蚀;铝箔的油硫腐蚀不仅会增大绝缘油的介质损耗、粘度和水分,而且会增大绝缘纸的介电常数和介质损耗,从而劣化油纸绝缘性能。对铝箔油硫腐蚀规律的探究结果为后期延缓或阻止套管中的油硫腐蚀对油纸绝缘的危害提供了理论基础。

关键词：铝箔油硫腐蚀变压器套管油纸绝缘老化产物介质损耗

基于“晶界工程”技术提升变压器用铜绕组抗油硫腐蚀及其对绝缘油性能的影响

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高电压技术 2018年第11期44卷 3546-3552页

作者：袁媛周江何潇刘国勇廖瑞金重庆大学材料科学与工程学院重庆400044 云南电网有限责任公司电力科学研究院昆明650200 重庆大学输配电装备及系统安全与新技术国家重点实验室重庆400044

＂油硫腐蚀现象＂是变压器铜绕组与绝缘油中存在的活性硫发生反应,反应产物进入油纸绝缘系统,导致其介损增大,电阻率下降,进而成为引发电力设备故障的一种因素。针对该情况,基于晶界工程（grain boundary engineering, GBE）技术,通过... 详细信息

＂油硫腐蚀现象＂是变压器铜绕组与绝缘油中存在的活性硫发生反应,反应产物进入油纸绝缘系统,导致其介损增大,电阻率下降,进而成为引发电力设备故障的一种因素。针对该情况,基于晶界工程（grain boundary engineering, GBE）技术,通过优化铜绕组制备工艺＂轧制＂过程中的形变量参数,调控铜绕组微观组织结构,提升其抗油硫腐蚀性能,并研究其对绝缘油性能的影响。结果表明：腐蚀实验后,＂GBE＂–Cu未出现腐蚀现象,油中铜元素含量较原始铜由3.66 mg/kg降低到0.466 mg/kg;同时腐蚀后绝缘油各项基本理化与电气性能均有提升,且老化程度降低。

关键词：铜绕组油硫腐蚀晶界工程绝缘油介质损耗退火孪晶

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套管硫腐蚀及其对油纸绝缘性能的影响

腐蚀科学与防护技术 2019年第2期31卷 137-143页

作者：刘国勇袁媛任啸廖瑞金周江姜有东重庆大学输配电装备及系统安全与新技术国家重点实验室重庆400044 重庆大学材料科学与工程学院重庆400044 国网重庆市电力公司电力科学研究院重庆401123

为了探索高压套管中铜芯与铝箔的油硫腐蚀问题,将铜-纸-铝交替缠绕的套管模型浸入含有不同浓度腐蚀性硫(DBDS)的绝缘油中,在130℃下进行40d热腐蚀实验。对铜芯,铝箔的腐蚀情况和腐蚀产物在油纸中生成情况进行了研究。结果表明:Cu和Al均... 详细信息

为了探索高压套管中铜芯与铝箔的油硫腐蚀问题,将铜-纸-铝交替缠绕的套管模型浸入含有不同浓度腐蚀性硫(DBDS)的绝缘油中,在130℃下进行40d热腐蚀实验。对铜芯,铝箔的腐蚀情况和腐蚀产物在油纸中生成情况进行了研究。结果表明:Cu和Al均发生了明显腐蚀现象。随着时间增加和DBDS浓度增大,绝缘纸上Cu2S沉积量增大,Cu和Al含量也增大,导致介电常数和介质损耗增大。随着DBDS浓度增大,绝缘油中Cu和Al含量增大,导致介损增大和击穿电压降低。

关键词：变压器套管油硫腐蚀油纸绝缘性能铝箔

基于晶界工程技术提升变压器绕组抗油硫腐蚀性能的研究

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腐蚀科学与防护技术 2019年第2期31卷 144-148页

作者：周江袁媛重庆大学输配电装备及系统安全与新技术国家重点实验室重庆400044 重庆大学材料科学与工程学院重庆400044

基于晶界工程(GBE)技术,通过对铜绕组进行加工(冷轧)及热处理(退火)参数优化,调控铜绕组微观组织结构,提升其抗油硫腐蚀性能,并研究其对绝缘油性能的影响。结果表明:经优化处理后的绕组,其抗腐蚀性能明显提升。腐蚀实验后,铜绕组表面无... 详细信息

基于晶界工程(GBE)技术,通过对铜绕组进行加工(冷轧)及热处理(退火)参数优化,调控铜绕组微观组织结构,提升其抗油硫腐蚀性能,并研究其对绝缘油性能的影响。结果表明:经优化处理后的绕组,其抗腐蚀性能明显提升。腐蚀实验后,铜绕组表面无明显的腐蚀痕迹,绝缘油中Cu含量由原先的3660μg/kg降低至2.47μg/kg,同时腐蚀后绝缘油电气性能均有提升。

关键词：铜绕组油硫腐蚀晶界工程绝缘油特殊晶界

腐蚀性硫浓度对“晶界工程”优化铜绕组抗油硫腐蚀性能的影响

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腐蚀科学与防护技术 2018年第2期30卷 127-134页

作者：许云洁袁媛周江何潇廖瑞金重庆大学材料科学与工程学院重庆400044 云南电网有限责任公司电力科学研究院昆明650200 重庆大学输配电装备及系统安全与新技术国家重点实验室重庆400044

为了缓解油浸式电力设备中广泛存在的油硫腐蚀问题,本文采用"晶界工程(GBE)"技术优化铜绕组,对其进行了不同腐蚀性硫浓度的腐蚀实验,通过对铜绕组和绝缘油中腐蚀产物的生成,以及微观分析,研究了"GBE"铜绕组的抗腐蚀性能,以及其对绝缘油... 详细信息

为了缓解油浸式电力设备中广泛存在的油硫腐蚀问题,本文采用"晶界工程(GBE)"技术优化铜绕组,对其进行了不同腐蚀性硫浓度的腐蚀实验,通过对铜绕组和绝缘油中腐蚀产物的生成,以及微观分析,研究了"GBE"铜绕组的抗腐蚀性能,以及其对绝缘油特性的影响。结果表明:由于"GBE"铜绕组特殊晶界比例的增加抑制了腐蚀坑的产生和合并,其具有优良的抗油硫腐蚀性能,即使在腐蚀性硫浓度达到2000 mg/kg时仍不会发生腐蚀,且其对绝缘油电气和理化性能影响较小。

关键词：硫腐蚀铜绕组晶界工程绝缘油腐蚀性硫浓度