A Study on the Method to Evaluate a Safety of the Transformer under a GIC Condition

摘要：

The unexpected DC current flows into the transformer through grounded neutral lines during a GIC(Geomagnetically Induced Current) event in power system. The DC current saturates a core, and causes rise of the magnetizing current and losses of the transformer. Especially, additional losses may result in fault of the transformer due to the local over-heating. In this paper, the methods to evaluate a safety of the transformer under a GIC condition are described. For this, the magnetizing current and flux density of the core, which increase according to the DC current, are calculated using EMTP(Electro- Magnetic Transient Program) and the magnetic equivalent circuit method, respectively. The losses and temperature rise are also calculated considering the load current and the magnetizing current. A safety of the transformer is evaluated by comparing the calculated temperature rise with the criterion based on the IEEE standard. The methods to prevent the transformer from local over-heating are also included in this paper.

关键词： GIC(Geomagnetically induced current) Half cycle saturation Magnetizing current Eddy current losses Temperature rise local over-heating Core air gap FEA(Finite element method analysis)

作者: D. H. Kim J. Y. Lee C. W. Kim M. J. Choi J. L. Kwon K. S. Park

作者单位: Hyundai Heavy Industries, Yongin, Korea

会议类型: 国际会议

会议名称: The International Conference on Electrical Engineering 2009(2009 电机工程国际会议)

会议地点: 沈阳

会议语种:英文

页码: 1-4

在线出版日期: 2009-07-05（万方平台首次上网日期，不代表论文的发表时间）