非侵入式低压配电网短路事故检测及定位方法

非侵入测量技术是新一代高级量测核心技术,最大的优点是无需侵入用户内部施工和进行复杂通信。将非侵入测量技术应用于短路事故统计和定位,首先,基于短路试验和理论建模,提出了断路器保护动作下低压配电网短路事故的发生判据及其整定流程;接着提出了非侵入架构下短路事故的定位算法,具体包括:配电层次初步定位方法、基于功率跌落的回路初步定位方法及复用分项计量电表的精确定位方法。算法实验期间,非侵入短路事故检测样机共定位4起单相短路事故,有效提高了用户的安全用电水平,同时大幅降低了用电安全监测系统的建设费用。

Non-Intrusive Fault Detecting and Locating Method in Low-Voltage Distribution Network

Non-intrusive load monitoring(NILM) is an advanced measuring technology which does not require intrusive construction into users and complicated communication channel. In this paper, the NILM technology is innovatively applied into short-circuit-fault detection and location. Firstly, based on the results of experimental and theoretical analysis, the criterion and the relevant setting process for short-circuit fault with the breaker protection is proposed. Secondly, the fault location algorithms under NILM architecture are presented, which contains three steps: primary locating method for distribution level, primary locating method for important branch based on power drop model, and accurate location method by reusing sub-metering data. Totally four single-phase short-circuit accidents are detected and located during the experiments, which effectively improves the safety level of power users and reduces the construction cost of monitoring system.