摘要
在电力系统中电力变压器是非常重要的电气设备,有'转换枢纽'之称。电力变压器的安全可靠运行对电力系统具有重大意义。变压器漏磁场的存在会导致绕组绝缘损坏,对电网安全稳定运行造成巨大的威胁。因此研究漏感特性有重要意义。本文通过Ansoft软件建立了800 kVA、10 kV真型配电变压器的物理模型,运用有限元法仿真了变压器绕组三相接地短路、匝地短路以及匝间短路等不同故障状态下的漏感值。研究结果表明,变压器三相短路时漏感明显增加,增幅约30%;匝地故障时,漏感与故障匝数呈非线性负相关,匝间故障时,漏感与故障匝数呈非线性正相关。研究结果可为变压器运行故障状态的检测及评估提供一定的参考。
Power transformer is one of the most important electrical equipment in electric system.As a hub conversion for the entire electric system,whether the power transformer is safe and stable is of great significance to electric system.The leakage magnetic fields of transformer may damage the insulation of the power transformer,which is viewed as a huge threat to power system safety and stable operation.Therefore it is of important significance to study the leakage magnetic field performance of transformer.In this paper the 800 kVA 10 kV real-scale electric transformer physical model was established by the finite element software Ansoft,and the transformer leakage inductance under different fault conditions,threephase to ground short fault,turn-to-ground short fault,turn-to-turn short fault were simulated by finite element method.Research results indicate that,leakage inductance of transformer with three-phase short circuit increases significantly,an increase of about 30%.In the analysis of modeling of the internal fault,the ground fault leakage inductance turns non-linear negative correlation;the turn-to-turn fault leakage inductance turns non-linear positive correlation.The conclusions can provide certain references for the detection and assessment of transformer operating faults conditions.
作者
王娜
徐珂
Wang Na;Xu Ke(Henan Polytechnic Institute,Nanyang Henan 473000,China;Henan Institute of Technology,Xinxiang Henan 453000,China)
出处
《科技通报》
2019年第8期134-138,146,共6页
Bulletin of Science and Technology
基金
河南省高等学校重点科研项目(15A470008)
关键词
变压器
绕组故障
漏感
电磁场
有限元法
transformer
winding faults
leakage inductance
electromagnetic field
finite element method
