Visualizing wavelet transformed travelling waves on power transmission line using JAVA

The paper reports work on analyzing travelling waves, which may occur on power transmission lines using Bewley lattice diagram (BLD) and wavelet transform (WT). It also reports the development work on a visualizing system, which implements the BLD and WT methods for visualizing the travelling waves, using the JAVA computer programming language. The paper describes the BLD and WT techniques for the analysis of the electromagnetic transients on power lines. Analysis of electromagnetic transients is important in the area of transmission line protection since the high frequency components of the transients can be utilized for the identification of the location of disturbance on the line. The structure of the JAVA visualization system is then described. The usefulness of the system is demonstrated by applying it to the fault distance identification problem on a 330 kV transmission line. The JAVA visualization system reported in this paper provides an excellent tool to dynamically show the complicated formation of travelling waves along the line initiated by large disturbance. It is useful to system planning and protection engineers. It is also a valuable tool for the teaching of power system electromagnetic transient analysis.