基于零序补偿导纳的小电流接地系统单相故障保护新方法  

A Novel Method to Identify the Single Phase-to-earth Fault in the Neutral Un-effectual Grounded System Using the Zero-sequence Compensated Admittance

作　　者：林湘宁[1] 高艳[1] 刘沛[1] 鲁文军[1] 

机构地区：[1]华中科技大学电力工程系,湖北省武汉市430074

出　　处：《中国电机工程学报》2006年第10期45-49,共5页Proceedings of the CSEE

基　　金：国家自然科学基金项目(50177011)

摘　　要：在深入分析零序导纳选线算法的基础上,提出基于零序补偿导纳的小电流接地系统单相接地保护新方法。该方法有效地利用了电网中的已知参数,通过补偿的实施,将故障线和健全线原本很小的区分裕度进行了有效的放大,以方便整定。结合工程实际的考虑,将电纳误差和补偿导纳角综合为一种小电流接地系统单相故障保护新算法。ATP仿真证明:该方法对线路故障有很好的分辨能力,而且对系统运行方式、故障方式、过渡电阻等因素的变化具有较高的鲁棒性, 在较大程度上提高了选线的正确率。A novel method to identify the single phase-to-earth fault in a Neutral Un-effectual Grounded System （NUGS） is proposed on the basis of analyzing the feeder selecting algorithm using zero-sequence admittance. By virtue of the compensation, the discrimination between the fault feeder and sound feeder can be highlighted, and the setting of the criterion therefore becomes feasible. Considering the on-site requirement to the protection, the susceptance error and phase angle of the compensated admittance are integrated as a novel algorithm of single phase-to-earth fault of NUGS. The results of simulation using ATP demonstrate that this algorithm is immune to the variation of network structures and parameters, fault conditions, and fault resistance etc. The successful rate of feeder selection is proved to be improved to a great extent.

关 键 词：电力系统 小电流接地系统 单相接地故障 保护 零序补偿导纳 

分 类 号：TM727[电气工程—电力系统及自动化] TM771