摘要
根据剩余电流的保护原理,分析了剩余电流保护中不能够区分由于投入漏电负载和切除漏电负载产生的漏电信号的缺陷,提出了一种基于剩余电流和漏电阻抗的保护方法。该方法通过观察漏电负载阻抗的实部正负特征来加以区分这两种信号,在原有的剩余电流保护方法的基础上,在理论上消除了切除漏电负载引起的剩余电流变化导致的误动作。提出了一种基于三角函数的两点法测定向量参数,易于编程化,能够快速地提取出计算漏电阻抗所需要的向量参数。
Shortage of residual current protection method which can not distinguish the signals caused by switching on the leakage current impedance from those by switching it off is analyzed according to residual current protection theory.A new method based on residual current and leakage current impedance is proposed,which distinguishes the two signals through metering that the real part of impedance is positive or negative,and it can theoretically eliminate the fault performance caused by residual current change due to cutting off leakage current impedance based on original residual current protection.Based on the trigonometric functions,a new method using two points in wave signal to figure out the vector is also proposed.The method is easy for programming and with which the vector parameter needed for computing the leakage impedance can be quickly gotten.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2011年第12期61-64,共4页
Power System Protection and Control
关键词
剩余电流
漏电电抗
误动作
向量
三角函数
residual current
leakage current impedance
fault performance
vector
trigonometric functions
