变压器绕组短路电动力计算分析及抗短路能力的研究
发布时间：2018-10-15 09:47
【摘要】：电力变压器是电力系统的主要设备之一,其可靠、稳定运行对整个电力系统的安全起到十分重要的作用。近年来,随着各地电网容量的不断增加,变压器故障也不断增多,故障中近区或出口短路故障占有很大比例,对电力系统的安全稳定运行造成了很大的影响。为了能尽量避免这类事故的发生,对变压器短路时短路电流及电动力进行计算分析,结合分析结果对绕组自身及周围结构件进行弱点补强、进行制造技术、工艺水平的改进等研究就具有十分重要的意义。本文介绍了课题的研究背景和意义,论述了变压器绕组漏磁场、短路电动力以及绕组的短路强度等问题的国内外研究现状。然后介绍了电磁场的基础理论和有限元计算软件,论述了漏磁场、短路电流、短路电动力等产生原因及计算方法。以一台63000kVA/110kV大型变压器为例,采用有限元数值计算方法,建立了等效计算模型,对变压器绕组的漏磁场分布、短路电动力进行了计算分析,并采用短路电动力的经典的静态计算对变压器模型进行了短路强度的验证,得出了变压器短路电动力的影响因素,提出了提高变压器抗短路能力的相关措施的参考结论。
[Abstract]:Power transformer is one of the main equipments in power system. Its reliable and stable operation plays a very important role in the safety of the whole power system. In recent years, with the continuous increase of power network capacity, transformer faults are also increasing. The near-zone or outlet short-circuit faults account for a large proportion, which has a great impact on the safe and stable operation of power system. In order to avoid this kind of accident as far as possible, the short circuit current and the electric force of the transformer are calculated and analyzed, and the weakness of the winding itself and the surrounding structure is strengthened with the result of the analysis, and the manufacturing technology is carried out. It is of great significance to study the improvement of process level. This paper introduces the research background and significance of the subject, and discusses the research status of transformer winding leakage magnetic field, short-circuit electromotive force and short-circuit strength of winding at home and abroad. Then the basic theory of electromagnetic field and finite element calculation software are introduced, and the reasons and calculation methods of leakage magnetic field, short circuit current and short circuit electric force are discussed. Taking a large 63000kVA/110kV transformer as an example, an equivalent calculation model is established by using finite element method. The magnetic leakage field distribution and short circuit electromotive force of transformer windings are calculated and analyzed. The short-circuit strength of the transformer model is verified by the classical static calculation of the short-circuit electric power. The influencing factors of the short-circuit electric power of the transformer are obtained, and the reference conclusions of improving the anti-short-circuit ability of the transformer are put forward.
【学位授予单位】：浙江工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM41
，
本文编号：2272151
[Abstract]:Power transformer is one of the main equipments in power system. Its reliable and stable operation plays a very important role in the safety of the whole power system. In recent years, with the continuous increase of power network capacity, transformer faults are also increasing. The near-zone or outlet short-circuit faults account for a large proportion, which has a great impact on the safe and stable operation of power system. In order to avoid this kind of accident as far as possible, the short circuit current and the electric force of the transformer are calculated and analyzed, and the weakness of the winding itself and the surrounding structure is strengthened with the result of the analysis, and the manufacturing technology is carried out. It is of great significance to study the improvement of process level. This paper introduces the research background and significance of the subject, and discusses the research status of transformer winding leakage magnetic field, short-circuit electromotive force and short-circuit strength of winding at home and abroad. Then the basic theory of electromagnetic field and finite element calculation software are introduced, and the reasons and calculation methods of leakage magnetic field, short circuit current and short circuit electric force are discussed. Taking a large 63000kVA/110kV transformer as an example, an equivalent calculation model is established by using finite element method. The magnetic leakage field distribution and short circuit electromotive force of transformer windings are calculated and analyzed. The short-circuit strength of the transformer model is verified by the classical static calculation of the short-circuit electric power. The influencing factors of the short-circuit electric power of the transformer are obtained, and the reference conclusions of improving the anti-short-circuit ability of the transformer are put forward.
【学位授予单位】：浙江工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM41
，
本文编号：2272151
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