摘要
在分析零序导纳选线算法的基础上,提出基于零序导纳角正弦值在中性点不接地系统中发生单相接地保护的新方法。利用健全线与故障线的零序导纳角分别靠近导纳复平面正、负虚轴的特点,通过健全线与故障线的零序导纳角正弦值符号进行故障选线,以提高选线的准确性和抗干扰能力。MATLAB仿真表明,该方法有较高的保护精度,适应不同的故障初相角,有较强的耐过电阻能力。
Based on an analysis of the feeder selecting algorithm, this paper proposes a novel method to detect the fault line using zero-sequence admittance when the single phase-to- earth fault happens in Neutral Point Ungrounded Power System. Because the zero sequence admittance angles of the healthy and fault line are near the plus axis and minus axis of the admittance complex plane, respectively, the sine value of the zero sequence admittance angle can be used to identify health and fault lines. The method improves the precision of selection of the fault line and enhances the anti-interference performance. The simulation results via MATLAB demonstrate that this method has high precision, which is suitable to a variety of fault beginner angles and can be used to detect high- impedance grounded faults.
出处
《电网与清洁能源》
2012年第8期39-42,共4页
Power System and Clean Energy
关键词
中性点不接地系统
零序导纳角
故障选线
MATLAB
neutral point ungrounded power system
zero sequenceadmittance angle
fault line detection
MATLAB
