摘要
提出一种利用测量电流互感器 ( TA)进行过流故障、故障电流幅值及故障方向检测的新算法。故障检测利用了 TA饱和时二次输出电流的间断角 ,而根据 TA在上下半周饱和前的有效信息进行故障电流幅值和方向的计算。电流幅值的估算采用了最小二乘法 ,可以滤除衰减直流分量和谐波 ;方向的计算利用了电压、电流故障分量间的相位关系。
Fault detection and isolation are key functions in distribution automation. A new fault detection and calculation algorithm using output data got from measurement current transformer is presented. The fault is detected by measuring the interruption angle of secondary output waveform of current transformer. The fault current amplitude and direction are determined using waveform samples before current transformer saturation in each half cycle. The fault current amplitude is calculated using least square error method, and its direction is calculated according to the relationship between superimposed components of voltage and current. Test results of a prototype device proved the proposed algorithm.
出处
《电力系统自动化》
EI
CSCD
北大核心
2001年第21期51-54,共4页
Automation of Electric Power Systems
关键词
配电网
故障电流
检测
电流互感器
Algorithms
Electric instrument transformers
Least squares approximations
Waveform analysis
