快速自动消弧线圈接地系统选线方案研究  

Research on line-selection used for the grounding system with fast arc-suppression coil

作　　者：许庆强[1] 伍雪峰[1] 丁士长[1] 毕潇昳[2] 

机构地区：[1]江苏省电力试验研究院有限公司,江苏南京210036 [2]西北电力培训中心电力系,陕西西安710054

出　　处：《继电器》2006年第21期1-4,8,共5页Relay

摘　　要：针对目前消弧线圈智能化程度和动作速度的提高对选线难度的增加,以及现有小电流接地选线本身存在的问题,提出了一种利用暂态零序电流识别故障线路的选线原理,用作经快速自动跟踪消弧线圈接地的选线方案。该选线方案首先选出零序电流突变量最大的三条线路,然后在零序电流突变量积分取得极大或极小值时比较极性,从而选出故障线路。由于只用到暂态零序电流量,该选线判据不受PT异常情况的影响,可以适用于任意方式的不直接接地系统。理论分析和现场故障录波数据验证了新选线方案的准确性和有效性。With the operating time of the intelligent arc-suppression coil increased, it is more difficult to select the fault line in the neutral indirectly grounded distribution systems. In order to overcome the disadvantage of the existing technique of fault line selection, a new theory of selecting the fault line is proposed by using the transient zero sequence currents, which has been applying to the grounding system with fast arc-suppresslon coil. Firstly, the first three maximal abrupt values of zero sequence currents can be selected. When the accumulative total of zero sequence currents abrupt values get the maximum or particle, the fault line can be selected according to the polarity of the three values. For that the transient zero sequence currents are used only, the criterion is immune to the abnormity of the PT, and it can be applied to all kinds of the neutral indirectly grounded systems. The theoretical analysis and the results tested by the fault recording data in a practical environment show that the proposed method can choose out the fault llne in distribution networks exactly and effectively.

关 键 词：电力系统 选线 消弧线圈 暂态电流 

分 类 号：TM864[电气工程—高电压与绝缘技术]