预调式消弧线圈自动控制装置的现场调试方法

Field Commissioning Method of Automatic Control Device for Pre － adjustable Arc Suppression Coil

摘要:

当中性点不接地的配电网系统发生单相接地故障时，将中性点经消弧线圈接地，是减小短路点故障电流，实 现接地点快速熄弧的关键技术。目前中国 10 kV 系统中已大量采用了预调试消弧线圈自动控制装置，但运检人员对 其运行状况和调试方法容易产生一些误区。通过分析系统各种运行方式下的电容电流的计算方法，对并列运行时的 消弧线圈给出了较优的控制策略，并结合不同型号消弧线圈调谐装置的调试和运行经验，提出了自动调挡、自动跟踪 调谐、手动调挡运行工况的判断方法，对消弧线圈技术的理论研究和工程实践有一定的指导意义。

Abstract:

When single － phase grounding fault occurs in distribution network with ungrounded neutral point，grounding technology of neutral point through arc suppression coil is the key technology for reducing fault current and realizing fast arc extinguishing at grounding point． At present，a large number of pre － adjustable arc suppression coil tuning devices have been used in 10 kV system in China． However，its operation status and commissioning methods cause some misunderstandings to the opration and maintenance staffs． The calculation methods of capacitive current under various operation modes of the system are analyzed，and a better control strategy for arc suppression coils in parallel operation is provided． Combining with the commissioning and operation experiences of different types of arc suppression coil tuning devices，the judgement methods for the operating conditions of automatic adjustment，automatic tracking and manual shifting are put forward． It has a certain guiding significance for the theoretical research and engineering practice of arc suppression coil technology．