消除模糊区的同杆双回线自适应重合闸

常规单相重合闸方式无法识别线路瞬时故障与永久故障,当重合于永久故障时,将对系统或相关设备增加一次冲击,并有可能导致直流换相失败。文中提出了一种仅需本回线信息的同杆双回线自适应重合闸判据,工程实用性强。该判据采用故障相故障点恢复电压,通过线路电容参数和多种故障类型下电容耦合电压的大小关系实时计算动作门槛,消除由线路电容参数和故障类型造成的故障性质判别模糊区;引入辅助判据,合理设置重合闸时间,消除由异名相跨线不接地故障造成的模糊区。仿真实验表明文中提出的自适应重合闸判据适用于同杆双回线可能出现的多种故障类型。

Adaptive reclosure of double-circuit line without fuzzy zone

Conventional single-phase reclosing mode cannot identify instantaneous fault and permanent fault, when reclosing permanent fault, will increase an impact related to system or equipment, and is likely to lead to DC commutation failure. In this paper, an adaptive reclosure criterion of double-circuit line is proposed, which only require single line information and have engineering practicability. The criterion uses the voltage of fault point, calculates the action threshold in real time through the capacitance parameters and the relationship between capacitance coupled voltages under various fault types to eliminate the fuzzy zone caused by the line capacitance parameter and fault type, introduces an auxiliary criterion and sets the reset time reasonably to eliminate the fuzzy zone caused by the cross - line non - earth fault. The simulation results show that the adaptive reclosing criterion is applicable to various types of failures that may occur on double-circuit Line.#$NLKeywords: adaptive reclose; double-circuit line; capacitive coupling voltage; fuzzy zone; action threshold; auxiliary criterion