基于改进的形态梯度法的变电站母线故障检测技术

Fault Detection Technology of Substation Bus Based on Improved Morphological Gradient Method

快速检测母线故障对于保障线路安全稳定运行有重要意义。将变电站母线或变压器的进、出电流信号通过改进的形态学梯度进行处理,提出一种快速检测母线故障的方法。所提方法简单,既不需要故障检测器,也不需要故障分类器,对多种故障类型、故障初始角、故障电阻、有噪声情况等均能有效识别故障,信噪比可达5dB。仿真结果表明,所提方法具有较高的安全性和可靠性,可快速区分系统内部和外部故障,相应指标可以识别变电站中两个母线区域的故障。

Rapid detection of bus fault is of great significance to ensure the safe and stable operation of the line.In this paper,the incoming/outgoing current signal of substation bus or transformer is processed by improved morphological gradient,and a fast detection method of bus fault is proposed.The proposed method is simple,does not need fault detector or fault classifier,and is effective for various fault types,fault starting angle,fault resistance,noise,etc.The signal to-noise ratio can reach 5dB.The simulation results show that the proposed method has high security and reliability,and can quickly identify the internal and external faults of the system.The related index can distinguish the faults in two bus areas.