谐振接地系统的新型自动调谐装置  

New Device of Resonance Tuning for the Resonant Grounding System

作　　者：江渝[1] 冉立[1] 刘和平[1] 

机构地区：[1]重庆大学电气工程学院高电压和电工新技术教育部重点实验室,重庆市400044

出　　处：《电力系统自动化》2006年第14期76-81,共6页Automation of Electric Power Systems

摘　　要：分析了线路对地电容对故障电流负序分量和零序分量的影响以及故障电流负序分量在配电系统中的分布特征,提出了根据接地时刻线路负序电流的相对最大值确定故障线路、根据故障线路负序电流和消弧线圈电流的相位差决定消弧线圈的调节方向、以故障线路负序电流分量的最小值为调节目标的新型综合自动调谐方法。该调谐方法在完成调谐的同时也完成了故障选线,但它并不以正确的故障选线为前提条件,无须测量配电系统的对地电容,也不受配电系统运行方式的影响。即使在故障接地期间改变配电系统的运行方式,该方法也能及时判断并准确调节消弧线圈电感使配电系统重新回到谐振状态。对开发的新型自动调谐装置样机进行了动模实验,结果验证了所提出的方法的正确性和装置的可行性。This paper analyzes the influence of ground capacitance of lines on the distribution of both the zero-sequence and negative-sequence fault current. A novel method for resonance tuning in distribution networks is then presented. In the proposed method, the minimal negative-sequence current of the fault line is the tuning goal after the fault line is chosen in terms of the relative maximal value of the negative-sequence currents of lines. At the same time, the phase difference between the negative-sequence current of the fault line and the current of the arc-suppression coil （ASC） is used to direct the change of the ASC inductance. In particular, the selection of the fault line and the resonance tuning can also be achieved using the proposed method, that is, the fault line may be chosen during the tuning for the resonance. The capacitance of the distribution network does not need to be measured and the network operation mode imposes no impact on the tuning. Even when the operation mode changes, the proposed method can detect the change and adjust the ASC inductance for the network resonance again. The effectiveness of a prototype device has been verified by the results of the dynamic simulation experiments.

关 键 词：谐振接地系统 单相接地 负序电流 自动调谐装置 

分 类 号：TM864[电气工程—高电压与绝缘技术]