特高压同杆双回功率传输对潜供电流的影响  

Influence of Power Transmission Capacity of UHV Double-circuit Transmission Line on Secondary Arc Current

作　　者：尹忠东[1] 周丽霞[1] 肖湘宁[1] 郑征[2] 

机构地区：[1]华北电力大学电力系统保护与动态安全监控教育部重点实验室,北京102206 [2]邢台供电公司,邢台054001

出　　处：《高电压技术》2009年第4期717-721,共5页High Voltage Engineering

基　　金：国家自然科学基金(50777019)~~

摘　　要：为了分析输电线路传输功率对潜供电流的影响,采用二次模变换的方法去掉相间耦合,实现多相系统的参数解耦,建立计算同杆双回输电线路潜供电流的数学模型后,针对线路传输功率的变化分别计算了不同故障点处潜供电流的大小。结果表明,线路传输功率对潜供电流的影响较大,且不同故障点处,潜供电流的变化趋势也不一样,故障点靠近线路首端或末端时,潜供电流会随传输功率的增大而变大,必须采取有效的抑制措施。Along with the enhancement of voltage level, the harmful affect of secondary arc current to the system becomes more and more obvious. The power transmission of the lines is one of factors that influence the secondary arc current. The voltage distribution along the transmission line will changes according to the different power transmission, which will lead to the variation of the induction component from the sound phases when the fault occurs. In this paper, the twice-mode transformation is adopted to establish the mathematic model of secondary arc current in the double-circuit transmission line. According to the variation of power transmission, the secondary arc current of different fault point is calculated. The results indicate that secondary are current is influenced much by the line transmission power, and the variation trend changes along with the fault point. When the fault occurs in head or terminal of the line, the secondary arc current may becomes larger along with the increasing of the transmission power, thus effective suppress measurements must be taken.

关 键 词：特高压 同杆双回路 潜供电流 单相自动重合闸 传输功率 二次模变换 

分 类 号：TM723[电气工程—电力系统及自动化]