变压器中性点交直流分量及小电抗投切方式分析  

AC and DC Components and Switch Mode of Small Reactor on Transformer Neutral Point

作　　者：李沛准[1] 陈创[2] 

机构地区：[1]中国能源建设集团广东省电力设计研究院,广州市510663 [2]中国南方电网公司广州供电局,广州市510600

出　　处：《电力建设》2013年第11期61-66,共6页Electric Power Construction

摘　　要：500 kV自耦变压器中性点加装小电抗是解决电网单相短路电流超标的有效措施之一。工程中需要分析主变中性点交直流分量,研究在投切过程中中性点的暂态电压变化,以此确定小电抗的投切方式。以某500 kV变电站加装小电抗实际工程为例,实测变压器中性点的交直流数据,分析了中性点交直流分量的特点及其来源。通过仿真分析研究了投切电抗器带来的中性点的暂态电压变化,并给出了中性点刀闸参数的选择要求。An effective solution to reduce the single-phase short-circuit current is to install small reactors on the neutral points of 500 kV autotransformer. In the course of engineering, the AC and DC components on the neutral points of main transformer should be studied, as well as the transient voltage during switching process, in order to determine the switch mode of the small reactor. Taking the installation of small reactors in a 500 kV substation as an example, the characteristics and sources of the AC and DC components were analyzed through the recorded data on the neutral point. The simulation research was carried out to analyze the change of transient voltage during the switching process of the small reactors, and finally the parameters of the earthing switch used on the neutral points were suggested.

关 键 词：中性点小电抗 投切方式 交直流分量 暂态电压 中性点刀闸 

分 类 号：TM406[电气工程—电器]