500kV变压器中性点交直流分量分析  

Analysis of the AC and DC Component on the 500 kV Transformer Neutral Point

作　　者：李沛准[1] 陈创[2] 罗小丹[1] 

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510663 [2]中国南方电网公司广州供电局,广州510600

出　　处：《云南电力技术》2014年第5期57-61,共5页Yunnan Electric Power

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。研究中以某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的参数选择要求。An effective solution to reduce the single-phase short-circuit current is to install small reactors on the neutral points of the 500 kV autotransformers？ During the practical project,the AC and DC component as well as the transient voltage of the neutral points should be studied in order to determine the switch mode of the small reactor？ This paper gave an example of installing small reactors in a 500 kV substation,analyzed the characteristic and the source of the AC and DC value through the recorded data on the neutral point？ The simulation research is done to find the transient voltage during the switching process of the small reactors,also the parameters of the earthing switch used on the neutral points is given out.

关 键 词：中性点小电抗 交直流分量 投切方式 中性点刀闸 

分 类 号：TM411.3[电气工程—电器]