1. Traveling Wave Visualization in Multi-phase Power Systems C.Y. Evrenosoğlu *, E. Akleman **, O.Ö. Özener ** and A. Abur * Texas A&M University TexGRAPH 2005 * : Dept. of Electrical Engineering ** : Dept. of Architecture (Visualization Lab.)

2. Contents Motivation and Objectives Proposed Methods Animation Program and Transients Sculpting Visualization of Voltage Profile During Transients Conclusions and Future Work

3. Power Systems & Transients Transmission Lines : carry power from generation areas to distribution areas (customers, industrial areas…etc) Faults (Lightning, line touchdown…etc) on transmission lines creates “Transients”

4. Motivation and Objectives  Visualization and 3D animation of power system electromagnetic transients with a user friendly graphical interface for better understanding of the entire system or an important part of a system during a transient

5. Proposed Methods A.Electromagnetic Transients Animation Program and Transients Sculpting Animation Program Voltage-Line Distance-Time graphics (Transient Sculpting) B.Visualization of Voltage Profile During Transients Triangular Representation Circular Representation Use of RGB Coloring (phase voltages and modal voltages)

6. Contents Motivation and Objectives Proposed Methods Animation Program and Transients Sculpting Visualization of Voltage Profile During Transients Conclusions and Future Work

7. A. Electromagnetic Transients Animation Program and Transients Sculpting Right side is for viewing the animation. Left side is for editing the system or for viewing the voltage-line distance-time figure of a transmission line during a transient.

8. DC energization of a line with open end-1 line time V TRANSIENT SCULPTING (Voltage - Line Distance – Time)

9. DC energization of a line with open end-2 Bewley Diagram Line t

10. Contents Motivation and Objectives Proposed Methods Animation Program and Transients Sculpting Visualization of Voltage Profile During Transients Conclusions and Future Work

11. B. Visualization of Voltage Profile During Transients I. Triangular representation II. Circular representation III. Use of RGB coloring Two bus system is studied for 1 phase to ground and 3 phase faults, voltage data at 10 intermediate points along the line are obtained for the studies.

12. I. Triangular Representation t

13. Triangular Animation Line sections |V|

14. II. Circular Representation Modal Trans. t

15. Circular Animation Line sections |V|

16. III. Use of RGB Coloring Form a picture using the phase voltage data along the transmission line R = 0 – 255 G = 0 – 255 B = 0 – 255

17. Phase Voltages – No Fault Line time

18. Phase Voltages – 1 phase-to-ground Line time

19. Phase Voltages – 3 phase-to-ground Line time

20. Modal Voltages This time each pixel on the picture consists of only ground or only aerial voltages. The ground mode information corresponds to RED while the aerial mode information corresponds to GREEN. In both cases remaining two color channels are 0 for all pixels.

21. Aerial Mode Voltage – 1 phase-to-ground Line time

22. Aerial Mode Voltage – 3 phase-to-ground Line time

23. Conclusions and Future Work  Software tool facilitates flexible visualization of electromagnetic transients  The current software is for single phase circuits.  This work is being extended to study faults in 3 phase, more complex power system topologies  An electromagnetic transient program is being written to be used within the animation software.  RGB Coloring is very useful for both illustrating the characteristics of traveling wave and locating the fault