1000kV特高压交流变电站铝管母线末端屏蔽方式研究

发布时间：2018-02-22 18:47

本文关键词： 特高压交流变电站铝管母线电晕有限元电场强度屏蔽方式　出处：《电网技术》2014年09期 　论文类型：期刊论文

【摘要】：管型母线因其良好的载流性能与可靠的机械连接特性被广泛应用于高压电站中,在特高压交流电站中,管形母线末端的屏蔽方式问题日渐突出,研究其屏蔽结构对特高压交流电站的设计具有重要意义。针对1 000 kV特高压交流长治站在带电试运行过程中硬铝管母线高压并联电抗器侧末端出现的电晕问题,使用有限元方法建立三维仿真模型,仿真计算了管母末端的电位和电场分布,找出了引起电晕放电的原因,并在此基础上研究了几种屏蔽方式的效果和可行性,提出了管母末端采用直径250 mm的半球形封盖板结构和于管母上方加装管径300 mm的均压环相结合这一合理的屏蔽方式。该屏蔽方式明显改善了管母末端的电场分布,使管母高压电抗器侧末端附近的场强最大值降低至1 390 V/mm,较原结构场强最大值降低了44.4%,满足局部控制场强的要求,有效抑制了管母末端的电晕放电。研究方法已经成功应用于特高压交流长治站中,并对类似结构电力设备的设计具有借鉴意义。
[Abstract]:Tubular busbar is widely used in high voltage power station because of its good current carrying performance and reliable mechanical connection characteristics. In UHV AC power station, the shielding mode of tube busbar end is becoming more and more prominent. It is of great significance to study its shielding structure for the design of UHV AC power station. In view of the corona problem at the end of high voltage parallel reactor of hard aluminum tube busbar during live test operation of 1 000 kV UHV AC Changzhi station, The three-dimensional simulation model is established by using finite element method. The potential and electric field distribution at the end of the tube are simulated and calculated. The causes of corona discharge are found out, and the effect and feasibility of several shielding methods are studied. In this paper, a reasonable shielding method is put forward, which is the use of a hemispherical sealing plate structure with a diameter of 250 mm and an equal pressure ring of 300 mm diameter on the top of the pipe mother. The shielding method improves the electric field distribution of the end of the pipe obviously. The maximum field intensity near the side end of the tube bus high-voltage reactor is reduced to 1,390V / mm, which is 44.4mm lower than the maximum field strength of the original structure, which satisfies the requirement of local control field strength. The corona discharge at the end of the tube is effectively suppressed. The research method has been successfully applied to the UHV AC Changzhi station and has reference significance for the design of the similar power equipment.
【作者单位】：电力设备电气绝缘国家重点实验室(西安交通大学);
【分类号】：TM63

【相似文献】