基于附加直流电源和零序功率方向型检测原理的低压馈电漏电保护装置设计  

Design of Leakage Protection Device for Low Voltage Feed Based on Additional DC Power and Zero Sequence Power Directional Pattern Detection Principle

作　　者：赵虹 Zhao Hong(Henan Institute of Chemical Technology,Kaifeng,China)

机构地区：[1]河南化工技师学院,河南开封

出　　处：《科学技术创新》2023年第7期220-223,共4页Scientific and Technological Innovation

摘　　要：本研究首先概述了附加直流电源的漏电保护原理和漏电闭锁电阻值的确定方法,并基于该原理设计了低压馈电漏电保护装置。该装置虽然能满足漏电检测与保护的要求,但是无法精确识别故障所在位置。基于此,本文提出了一种基于零序功率方向型检测原理的漏电保护改进方案,该装置由无源RC滤波电路、带通滤波器、零序电流互感器等组成,具有灵敏度高、选择性好等优点,可精确判断漏电故障的位置,并切断故障所在支路的电源,而不影响其他支路的正常运行。This research first summarizes the leakage protection principle of additional DC power supply and the determination method of additional DC voltage value and leakage blocking resistance value,and designs the low-voltage feed leakage protection device based on the principle.Although the device can meet the requirements of leakage detection and protection,but can not accurately identify the fault location,can only achieve the purpose of leakage protection by cutting off the main power supply.Based on this,this paper proposes an improved leakage protection scheme based on zero-sequence power directional pattern detection principle.The device consists of passive RC filter circuit,band-pass filter,zero-sequence current transformer,etc.,which has the advantages of high sensitivity and good selectivity.It can accurately judge the location of leakage fault and cut off the power supply of the branch where the fault is located without affecting the normal operation of other branches.

关 键 词：附加直流电源 零序功率 带阻滤波器 漏电保护 

分 类 号：TM564.8[电气工程—电器] TP391.44[自动化与计算机技术—计算机应用技术]