In the distribution network system with its neutral point grounding via arc suppression coil, when single-phase grounding fault occurred near zero-crossing point of the phase voltage, the inaccuracy of the line select...In the distribution network system with its neutral point grounding via arc suppression coil, when single-phase grounding fault occurred near zero-crossing point of the phase voltage, the inaccuracy of the line selection always existed in existing methods. According to the characteristics that transient current was different between the fault feeder and other faultless feeders, wavelet transformation was performed on data of the transient current within a power frequency cycle after the fault occurred. Based on different fault angles, wavelet energy in corresponding frequency band was chosen to compare. The result was that wavelet energy in fault feeder was the largest of all, and it was larger than sum of those in other faultless feeders, when the bus broke down, the disparity between each wavelet energy was not significant. Fault line could be selected out by the criterion above. The results of MATLAB/simulink simulation experiment indicated that this method had anti-interference capacity and was feasible.展开更多
The purpose of this article is to remind of the past and present problems of creating single wire electrical systems. This article presents a new one wire electrical transmission system named B-Line which uses one lin...The purpose of this article is to remind of the past and present problems of creating single wire electrical systems. This article presents a new one wire electrical transmission system named B-Line which uses one line only and does not use ground as a second line. The proposed method is to work on all frequencies and on all communication systems including DC systems. It also proposes to work on the concept of the single-pole signal source and single-pole signal load. It illustrates the possibility of cutting the cost of electrical lines and several other advantages in the fields of high frequency communication lines and antennas.展开更多
为解决配电线路单相接地故障诊断准确率低的问题,引入行波信号开展了基于行波信号的10 k V配电线路单相接地故障诊断方法的研究。首先利用行波信号提取配电线路故障特征,然后设置配电线路两端行波记录点,通过测距定位确定故障位置实现...为解决配电线路单相接地故障诊断准确率低的问题,引入行波信号开展了基于行波信号的10 k V配电线路单相接地故障诊断方法的研究。首先利用行波信号提取配电线路故障特征,然后设置配电线路两端行波记录点,通过测距定位确定故障位置实现配电线路单相接地故障诊断。结果表明,应用该方法后,配电线路单相接地故障诊断识别准确率达到98.5%以上,可行性较高。展开更多
文摘In the distribution network system with its neutral point grounding via arc suppression coil, when single-phase grounding fault occurred near zero-crossing point of the phase voltage, the inaccuracy of the line selection always existed in existing methods. According to the characteristics that transient current was different between the fault feeder and other faultless feeders, wavelet transformation was performed on data of the transient current within a power frequency cycle after the fault occurred. Based on different fault angles, wavelet energy in corresponding frequency band was chosen to compare. The result was that wavelet energy in fault feeder was the largest of all, and it was larger than sum of those in other faultless feeders, when the bus broke down, the disparity between each wavelet energy was not significant. Fault line could be selected out by the criterion above. The results of MATLAB/simulink simulation experiment indicated that this method had anti-interference capacity and was feasible.
文摘The purpose of this article is to remind of the past and present problems of creating single wire electrical systems. This article presents a new one wire electrical transmission system named B-Line which uses one line only and does not use ground as a second line. The proposed method is to work on all frequencies and on all communication systems including DC systems. It also proposes to work on the concept of the single-pole signal source and single-pole signal load. It illustrates the possibility of cutting the cost of electrical lines and several other advantages in the fields of high frequency communication lines and antennas.
文摘为解决配电线路单相接地故障诊断准确率低的问题,引入行波信号开展了基于行波信号的10 k V配电线路单相接地故障诊断方法的研究。首先利用行波信号提取配电线路故障特征,然后设置配电线路两端行波记录点,通过测距定位确定故障位置实现配电线路单相接地故障诊断。结果表明,应用该方法后,配电线路单相接地故障诊断识别准确率达到98.5%以上,可行性较高。
