电场分布及匝数偏差暂态电动力对并联电抗器影响  

Study on Influence of Electric Field Distribution and Deviation of Number of Turns on Transient Power of Dry Type Air Core Shunt Reactor

作　　者：吴彦霖[1] 谭向宇 马仪 王科 钱国超 张轩[1] 王岩[1] 郭小兵[1] 

机构地区：[1]云南电网公司研究生工作站,昆明650217 [2]云南电网有限责任公司电力科学研究院,昆明650217

出　　处：《云南电力技术》2016年第4期94-99,共6页Yunnan Electric Power

摘　　要：针对干式空心并联电抗器绝缘开裂、树枝状放电等问题,本文采用ANSYS场-路耦合有限元分析方法,对一台BKDK-20000/35大型电抗器建立仿真模型,通过对干式空心并联电抗器进行电场分布仿真和基于匝数偏差暂态电动力数值解析,讨论了该电抗器绝缘被破坏的可能性。研究结果表明:内部绝缘匝间电场最大场强比包封端部高;根据计算匝间场强最大值,气隙场强达到2.04 k V/mm,足以发生沿面放电;投入电抗器时的暂态电动力增大,并且接近稳态电动力的4倍;发现匝数偏差造成有偏差层线圈投入暂态电动力的相位发生横向改变,电动力最大值也明显增加。沿面放电和暂态电动力对匝间绝缘材料起老化和破坏作用,可以造成干式空心电抗器匝间短路事故,这为干式空心电抗器的事故分析提供依据。In this paper, a simulation model of is used to establish the simulation model of a BKDK-20000/35 large reactor. The potential of the insulation of the reactor is discussed by using the ifnite element analysis method of the ANSYS ifeld coupled ifnite element method. The results show that the maximum electric ifeld intensity of the inner insulation is higher than that of the envelope, and the air gap reaches 2.04 kV/mm, which is 4 times of the transient electric power, and the maximum value of the electric power is increased obviously. Along the surface discharge and transient electric power, the fault of the inter turn short circuit fault of dry type air core reactor can be caused by the failure of the dry type air core reactor.

关 键 词：干式空心并联电抗器 电场分布 沿面放电 匝数偏差 暂态电动力 

分 类 号：TM47[电气工程—电器]