摘要
变压器在受到多次外部短路电动力的冲击后,其绕组可能发生不可逆的累积损伤,影响变压器的稳定运行,甚至对电网安全造成影响。因此,对变压器绕组多次短路冲击的累积效应进行研究,将有助于及早提出解决方案,避免事故的进一步发展。本文基于一台SFSZ7-31500/110真型变压器建立考虑累积效应的多次短路仿真模型,开展高压-中压三相对地短路工况下的漏磁场计算,获得了多次短路冲击下变压器短路电流产生的漏磁场和电磁力分布及变化情况,仿真结果表明随着短路次数的增加,漏磁和电磁力分别与电流和电流平方逐渐呈非线性关系,累积效应使得绕组机械性能发生变化。
After the transformer is impacted by external short-circuit electric power for many times,its windings may suffer ir-reversible cumulative damage,which affects the stable operation of the transformer and even affects the safety of the power grid.Therefore,the research on the cumulative effect of the short-circuit impact of the transformer winding will help to propose solutions as soon as possible and avoid the further development of the accident.In this paper,based on a SFSZ7-31500/110 true transformer,a multiple short-circuit simulation model considering the cumulative effect is established,and the leakage magnetic field calculation under the condition of high-voltage medium-voltage three phase-to-ground short-circuit is carried out,and the short-circuit current generation of the transformer under multiple short circuits is obtained.The result shows that with the in-crease of the times of short-circuits,the leakage magnetic field and electrodynamic force are gradually nonlinear with the current and the square of the current respectively,and the cumulative effect makes the mechanical property of the winding change.
作者
李天然
高树国
孙路
赵军
LI Tianran;GAO Shuguo;SUN Lu;ZHAO Jun(State Grid Hebei Electric Power Research Institute,Shijiazhuang 050021,China)
出处
《河北电力技术》
2022年第3期73-77,87,共6页
Hebei Electric Power
基金
国网河北省电力有限公司科技项目(kj2019060)。
关键词
变压器绕组
多次短路
累积效应
仿真建模
transformer winding
multiple short circuit
cumulative effect
simulation modeling
