直流接地极位置对变压器偏磁电流影响分析

Analysis of Influence of DC Grounding Poles on Transformer Partial Magnetic Current

直流偏磁是现代电力系统发展必须解决的重要问题之一,不仅会造成电力设备本体损伤、继电保护装置误动与拒动,甚至会引发电力系统层面的故障及灾害性事故。直流接地极位置影响周边交流系统直流偏磁电流的分布。文中综述了近年来关于直流偏磁的治理方法,并加以分类,提出了直流偏磁的治理原则及治理方法的适用性建议,利用标准算例,研究了不同接地极位置下直流电流的分布特点和治理规律,最后对相关研究中的进展和存在的问题进行了论述,并指出了今后的研究方向,以期为现代电力系统直流偏磁的治理提供参考。

DC bias magnetization is one of the important issues that must be solved in the development of modern power systems:not only will the power equipment body be damaged,the relay protection device will malfunction or refuse to move,and it may even cause a failure or even a catastrophic accident at the power system level.The position of the DC grounding pole affects the distribution of the DC bias current of the surrounding AC system.The paper first reviewed the methods of DC bias control in recent years,classified them,and proposed the principle of DC bias control.Once again,the applicability suggestion of the method was proposed.Finally,standard examples were used to study the different grounding poles.DC current distribution characteristics and governance rules.At the end of this paper,the progress and existing problems in related researches are discussed,and the future research directions are pointed out in order to provide a useful reference for the control of DC bias in modern power systems.