期刊论文

中文

电工技术学报

1000-6753

2024

39

08

2578-2590

10.19595/j.cnki.1000-6753.tces.230120

52061130217:国家自然科学基金 036100KK52200045:中国南方电网有限责任公司研究开发项目

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多次短路会逐渐积累绕组机械损伤,最终导致电力变压器损坏.然而,目前缺乏一种量化评估方法来评估此类损伤,这对电网的安全运行构成了威胁.因此,该文提出一种考虑绕组的非线性特点和累积过程的电力变压器绕组短路累积机械损伤评价方法,为评估绕组短路对电力变压器的影响提供了新的途径.该方法采用阻尼比和可靠性损失系数作为特征量,通过指数型曲线来模拟绕组机械弱化过程.同时考虑变压器的初始承受短路的能力、短路电流幅值和故障次数等影响因素,量化了短路损伤与绕组动态机械寿命之间的关系.此外,通过对一台 110 kV电力变压器进行多次短路破坏性试验,验证了该评价方法的正确性.最后,阐述了提出的...

Multiple short circuits can gradually accumulate mechanical damage to the windings,leading to the failure of power transformers.However,a quantitative assessment method is lacking to evaluate such damage,and grasping the mechanical state of the transformer winding after a short-circuit impact is challenging.The cumulative damage of windings caused by multiple short circuits is still an urgent problem in the industry,which poses a threat to the secure operation of power grids.Therefore,this paper proposes an evaluation method for assessing the accumulated mechanical damage caused by short circu...