含同杆双回线的输电网零序反时限过流保护加速配合方案

发布时间：2018-05-08 13:35

本文选题：继电保护 + 同杆双回线　；参考：《电力自动化设备》2017年09期

【摘要】：分析了同杆双回线内部发生接地故障时故障线路及相邻线路上零序反时限过流保护的动作特性。分析结果表明当故障位置与两侧系统参数满足特定条件时,双回线相邻线路上的零序反时限保护可能误动,故障线路两端保护的灵敏度配合可能存在问题。提出一种改变相邻线路保护时间整定系数的方法来避免可能出现的保护误动,该方法通过增加相邻线路保护动作延时来保证双回线保护优先动作,但也给相邻线路保护的速动性带来不利影响。此外故障线路两端保护的动作时间可能相差较大,不利于故障的快速切除。为此设计了基于零序电流变化和零序功率方向的加速方案,无论双回线故障还是双回线相邻线路故障,均能确保故障线路保护优先动作,从而保证各处保护的选择性和速动性。算例仿真验证了分析结论的正确性和所提加速方案的可行性。
[Abstract]:The operation characteristics of zero sequence reverse time overcurrent protection on the fault line and adjacent line are analyzed when the grounding fault occurs inside the double circuit line of the same pole. The analysis results show that the zero-sequence inverse time-limited protection on the adjacent lines of the double-circuit line may be misoperated when the fault location and the parameters of both sides of the system meet the specific conditions, and the sensitivity coordination of the protection at both ends of the fault line may be problematic. A method of changing the time setting coefficient of adjacent line protection is proposed to avoid possible protection misoperation. This method guarantees the priority action of double circuit protection by increasing the delay of adjacent line protection action. But it also brings adverse effect to the rapidity of adjacent line protection. In addition, the operation time of fault line protection may vary greatly, which is not conducive to quick fault removal. Therefore, an acceleration scheme based on zero sequence current change and zero sequence power direction is designed. Whether the double circuit fault or the double circuit line adjacent line fault can ensure the priority action of fault line protection, the selectivity and rapidity of the protection are guaranteed. The simulation results show the correctness of the analysis and the feasibility of the proposed acceleration scheme.
【作者单位】：山东大学电网智能化调度与控制教育部重点实验室;国网山东省电力公司检修公司;国网山东省电力公司调控中心;
【基金】：国家自然科学基金资助项目(51377100)~~
【分类号】：TM773

【相似文献】