高电压技术2025，Vol.51Issue(2)：619-629,11.DOI:10.13336/j.1003-6520.hve.20240941
系统单相接地对接地变压器绕组暂态特征的影响
Influence of System Single-phase Grounding on Transient Characteristics of Grounding Transformer Windings
摘要
Abstract
Single-phase grounding of a system will change the transient characteristics of the grounding transformer winding,and affect its operating state diagnosis and related protection setting.Since the transient characteristics of the grounding transformer winding are closely related to the overall operating conditions of the distribution network,it is dif-ficult to perform analysis by a single simulation model.Therefore,a multidimensional simulation model composed of the electromagnetic transient model of the distribution network and the multi-physical field model of the grounding trans-former is constructed,and the accuracy of the model is verified by test values and actual fault cases.The dynamic power parameters of external systems are input through data coupling,and the physical characteristics of grounding transformer winding before and after single-phase grounding operation are studied.The results show that,when the system is in sin-gle-phase grounding operation,the current characteristics of the low-voltage winding of the grounding transformer remain unchanged,the maximum current of the high-voltage winding is increased,the maximum current phase difference is de-creased,and the leakage magnetic field shifts outwards and increases the interphase magnetic leakage.The stress deformation law of high voltage winding changes,and the shape variable increases slightly;under the impact of multiple single-phase grounding faults,the winding has no obvious deformation,and the cumulative effect is weak.The maximum temperature rise of the high voltage winding is increased,and the temperature difference between the main winding and phase-shift winding of the same core column is increased.关键词
接地变压器/系统单相接地/多维仿真模型/温度/累积形变Key words
grounding transformer/system single-phase grounding/multi-dimensional simulation model/temperature/cumulative deformation引用本文复制引用
咸日常,李嘉洋,赵如杰,吕东飞,邢雅雯,张伟..系统单相接地对接地变压器绕组暂态特征的影响[J].高电压技术,2025,51(2):619-629,11.基金项目
国家自然科学基金(52077221).Project supported by National Natural Science Foundation of China(52077221). （52077221）
