摘要
潖江变1号变压器中性点直流电流抑制装置采用在变压器中性点串联电容器阻断直流电流的方案,且电容器并联了由快速开关、整流桥、大功率晶闸管、过电压触发单元、快速脱扣回路等组成的快速旁路系统。文章介绍了该装置的工作原理,叙述了贵广Ⅱ回直流试验期间该装置的动作情况,并讨论了主变中性点安装隔直装置对相邻变压器中性点的影响,试验及运行数据表明,装置能有效抑制变压器中性点直流电流。
The scheme of adopting the capacitor connected in series with transformer neutral to block DC current is used to the transformer neutral DC current blocking device for No.1 power transformer of Pajiang substation, while the capacitor is connected in parallel with fast by-pass system consisting of fast switch, rectifier bridge, high-power thyristors, overvoltage-triggering unit and fast-tripping circuit. This device can withstand fault current of 20 kA with duration of 1 second, and its standard impedance is less than 1.2 W, the trigger time of the by-pass system is shorter than 20ms, meanwhile, the monitoring and control unit make the operation of the device visible, controllable and operable. The action of this device during the testing period of the No.2 circuit of HVDC power transmission project from Guizhou to Guangdong is described in detail, and impacts of configuring DC current blocking device in the neutral of No.1 power transformer of Pajiang substation on neutrals of adjacent power transformers are analyzed. Both test results and operation data show that this device works normally and can effectively block DC current in transformer neutral.
出处
《电网技术》
EI
CSCD
北大核心
2009年第20期147-151,共5页
Power System Technology
关键词
串联电容法
变压器中性点直流电流抑制装置
旁路系统
单极大地运行方式
conductor connected in series
transformerneutral DC current blocking device
bypass system
monopole-ground operation mode
作者简介
张金平（1972—），男，高级工程师，主要从事电力系统稳定控制及自动装置的研究工作，E—mail：zjp2000@epri．sgcc．com．cn；
张辉（1962-），男，高级工程师，主要从事电力系统稳定控制及自动装置的研究工作，E-mail：zhanghui@eprisgcc．com．cm
熊敏（1966-），男，教授级高级工程师，主要从事电力系统稳定控制及自动装置的研究工作。
