取向硅钢服役过程中绝缘涂层劣化规律与评价

doi:10.13228/j.boyuan.issn0449-749x.20180252

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摘要为了提高电力变压器运行维护效率，跟踪分析了服役时间为0～35年的主变压器、厂用变压器、配电变压器中取向硅钢绝缘涂层性能及微观形貌特征，并模拟变压器油环境（不同硫质量分数、酸浓度、温度、纸板等）开展了硅钢涂层加速劣化试验，对绝缘涂层的服役性能进行评价。随着变压器运行时间延长，铁芯中硅钢涂层绝缘电阻及附着性逐步下降，涂层表面粗糙并出现腐蚀坑、裂纹等微观缺陷，且在配电变压器中的腐蚀速率大于高电压等级变压器。初步确立了绝缘涂层加速劣化试验条件与变压器实际运行数十年后涂层状态之间的等效关系，可支撑在役变压器铁芯材料服役状态评估及寿命预测。

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	程灵
	孟利
	郭大为
	陈新
	韩钰

关键词 ：电力变压器, 硅钢绝缘涂层, 劣化规律, 状态评估

Abstract：In order to improve the efficiency of operation and maintenance of power transformers，the properties and micromorphology characteristics of the insulation coating of the grain-oriented （GO） silicon steel in different types of transformers with the service time of 0-35 years were analyzed. The accelerated deterioration experiment of GO steel coating was carried out by simulating the transformer oil environment （different concentrations of the sulfur， the acid， the temperature and the cardboard etc），and the service performance of the insulation coating was evaluated. With the increasing of the operation time of the transformer，the insulation resistance and the adhesion of the silicon steel coating gradually decreased. Also，the coating surface became rough and corrosion pits and micro cracks appeared. The corrosion rate in the distribution transformer was greater than that in the high voltage transformer. Finally，the equivalent relation between the accelerated deterioration test condition of the insulation coating and the coating state after the actual operation for several decades in transformer was preliminarily established，which can support the evaluation of the service state and the service life prediction of the transformer core material.

收稿日期: 2018-06-20 出版日期: 2019-02-22

PACS:

TM275

引用本文:

程灵，，孟利，郭大为，陈新，韩钰. 取向硅钢服役过程中绝缘涂层劣化规律与评价[J]. , 2019, 54(1): 79-84. CHENG Ling，，MENG Li，GUO Da-wei，CHEN Xin，HAN Yu. Deterioration law and evaluation of insulation coating of grain-oriented silicon steel in service. Iron and Steel, 2019, 54(1): 79-84.

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http://www.chinamet.cn/Jweb_gt/CN/10.13228/j.boyuan.issn0449-749x.20180252 或 http://www.chinamet.cn/Jweb_gt/CN/Y2019/V54/I1/79

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