一起换流站极母线直流电压测量异常原因分析  

Analysis About Abnormal Pole Bus Direct Current Voltage Measurement in Convertor Station

作　　者：陈明佳[1] 王靓[1] 荣军[1] 卢雯兴[1] 黄聪[1] 李顺[1] CHEN Ming-jia;WANG Liang;RONG Jun;LU Wen-xing;HUANG Cong;LI Shun(Liuzhou Bureau of China Southern Power Grid Extra High Voltage Power Transmission Company, Liuzhou 545026, China)

机构地区：[1]中国南方电网超高压输电公司柳州局,广西柳州545026

出　　处：《电工电气》2017年第4期46-49,共4页Electrotechnics Electric

摘　　要：针对±500kV桂中换流站双极先后出现极母线直流电压测量异常的情况,从测量异常现象入手结合直流电压测量装置原理,依据现场检查结果初步确定了故障位置。通过现场复现式仿真实验,确定了故障原因为远端模块箱体接地不良造成其前级电路的电阻一端浮空,通过在远端模块箱体增加屏蔽接地线等方法,消除了测量异常。Aiming at the abnormal high fault condition of bus voltage UdL happened one after another in±500kV Guizhong ConverterStation’s twin poles,starting from abnormal measurement and combining with the principle of direct current voltage measuring device,thispaper preliminarily confirmed the fault location according to the onsite inspection results.The onsite reproduction simulation experimentsshow that the imperfect grounding of remote terminal unit box caused one end earth free of its preceding stage circuit resistance.The way toadd shielding grounding etc.for remote terminal unit box could eliminate abnormal measurement.

关 键 词：直流电压测量装置 远端模块 屏蔽接地 复现式仿真实验 

分 类 号：TM721.1[电气工程—电力系统及自动化] TM933.2