Deployment of standalone Software for Performance Analysis of Substation Grounding System

Deployment of standalone Software for Performance Analysis of Substation Grounding System

Presented at ICCIET - 2014

Prepared by:Jani Pranav K.M. E. 4th Semester,Electrical Power System,KITRC, Kalol.

Contents

• Introduction• Introduction to MATLAB GUI• Development of Grounding System Analyzer• Validation of Performance of Software• Conclusion• References

Introduction

• Importance of Grounding System• Grounding system provides a place for

connecting system neutral points, equipment body and support structures to the earth.

• It also ensures safety of working personnel within the substation and enables earth fault detection and protection.

• It provides path for discharging the earth currents from neutrals of equipment, faults, surge arrestors, overhead shielding wires etc.

• It keeps step and touch potential within tolerable limits.

Basic Shock Situations

IEEE Safety Criteria for Grounding system design• “actual step and touch (mesh) voltages must

not exceed the maximum permissible step and touch voltages defined by following equations even in the worst case.”

sssstep t

CE 116.0)61000(50

ssstouch t

CE 116.0)5.11000(50

sssstep t

CE 157.0)61000(70

ssstouch t

CE 157.0)5.11000(70

Introduction to MATLAB GUI Development

• Why MATLAB GUI Development?• High level script based development• Platform independent GUI applications• No need to learn programming languages like

C, C++ & Java.• GUI developed by MATLAB works

satisfactorily on various operating systems with little or no modifications.

• MATLAB has very nice inherent GUI development environment called as GUIDE that allows creation of GUI so that the code becomes more user friendly. It is similar to VB for creating GUI.

Introduction to MATLAB GUI Development

• Salient Features of MATLAB GUI Development.• MATLAB provides programmers with a set of

structured event driven components in the form of user interface controls (uicontrols) and menus (uimenus) that can easily be assembled and used to create GUIs.

• Communicate with the computer without programming commands.

• Integration of MATLAB script and function files with the figure files can prove priceless and programmer friendly also in addition to being user friendly.

Development of Grounding System Analyzer Software

Development of Grounding System Analyzer Software

Development of Grounding System Analyzer Software

Data for sample grounding system design problem

Sr. No. Quantity Value Unit1 Fault current 25 kA2 Shock duration 0.5 sec3 Fault duration 1 sec4 Surface layer resistivity 3000 Ω . m5 Surface layer thickness 0.1 m6 Soil resistivity 40 Ω . m7 Depth of grid 0.6 m8 Length in X direction 63 m9 Length in Y direction 33 m10 Conductor separation 3.3 m11 No. of ground rods 17 12 Length of ground rod 3 m

13 Conductor material for grid Zinc coated steel rod

14 Conductor material for rods Zinc coated steel rod

Results for sample grounding system design problem

Conclusion

• This paper describes development of software named Grounding System Analyzer that can be used for analysis and design of substation grounding systems.

• Performance of the software is tested by comparison with Ground Grid Systems module of ETAP.

• A sample problem has been solved by both the software and comparison of results validates performance of newly developed software GSA.

• With further development going on it is proposed to be professional software in the field of grounding system design.

References[1] Kaustubh A. Vyas and J.G. Jamnani: 'Optimal Design and Development of Software for Design of Substation Grounding System'. International Conference on Current Trends in Technology – NUiCONE, Ahmedabad, Gujarat, India, December 2011, pp. 1 – 6.[2] Kaustubh A. Vyas, ‘Optimal Design of Substation Grounding System’, Masters’ Thesis, Institute of Technology – Nirma University, Gujarat – India, May 2012[3] F. P. Dawalibi and D. Mukhedkar, 'Optimum Design of

Substation Grounding in a two Layer Earth Structure, Part-1'. IEEE Transactions on PAS, March 1975, Vol. 94, No. 2, pp. 252-261.[4] J. G. Sverak, 'Optimized Grounding Grid Design Using

Variable Spacing Technique'. IEEE Transactions on PAS, January 1976, Vol. 95, No. 1, pp. 362-374.[5] J. Nahman, and D. Salamon, 'Earthing system modeling by element aggregation'. IEE Proceedings Gener. Transm.

Distrib. , January 1986, Vol. 133, Part. C, No. I, pp. 54 – 58.[6] J. A. Sulivan, 'Alternative earthing calculations for grids and rods'. IEE Proceedings Gener. Transm. Distrib., May 1998, Vol. 145, No. 3, pp. 271- 280.

References[7] W. Sun, J. He, Y. Gao, R. Zeng, W. Wu and Q. Su: ‘Optimal Design Analysis of Grounding Grids for Substations Built in Non uniform Soil’. IEEE International Conference on Power System Technology, Perth, Australia, December 2000, Vol.3, pp. 1455 – 1460. [8] Dr. Attia A. El-Fergany, “Design and optimize substation grounding grid based on IEEE Std. 80 - 2000 using GUI and MATLAB codes”, International Journal of Engineering Science and Technology, Vol. 3 No. 7, pp. 6033- 6039, July 2011.[10] MATLAB on line help: http://www.mathworks.in/help/techdoc

/creating_guis/bqz6p81.html[11] Scott T. Smith: 'MATLAB advanced GUI development', (Dog ear publishing, 2006).[12] Patrick Marchand and O. Thomas Holland: 'Graphics and GUIs with MATLAB', (Chapman and Hall publishers, 2002, 3 rd edition) [13] IEEE 80: ‘IEEE Guide for safety in AC Substation Grounding’, 2000[14] APS Meliopoulos, ‘Power System Grounding and Transients’, Marcel Dekker Inc., New York, 1988

THANK YOU