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An Analysis of Single Wire Earth Return (SWER) System for Rural Electrification

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An Analysis of Single Wire Earth Return (SWER) System for Rural Electrification Scholars' Mine Masters Theses Student Theses and Dissertations 1972 An analysis of single wire earth return (SWER) system for rural electrification Balwinder Singh Samra Follow this and additional works at: https://scholarsmine.mst.edu/masters_theses Part of the Electrical and Computer Engineering Commons Department: Recommended Citation Samra, Balwinder Singh, "An analysis of single wire earth return (SWER) system for rural electrification" (1972). Masters Theses. 5062. https://scholarsmine.mst.edu/masters_theses/5062 This thesis is brought to you by Scholars' Mine, a service of the Missouri S&T Library and Learning Resources. This work is protected by U. S. Copyright Law. Unauthorized use including reproduction for redistribution requires the permission of the copyright holder. For more information, please contact [email protected]. AN ANALYSIS OF SINGLE WIRE EARTH RETURN(SWER) SYSTEM FOR RURAL ELECTRIFICATION BY BALWINDER SINGH SAMRA, 1945- A THESIS Presented to the Faculty of the Graduate School of the UNIVERSITY OF MISSOURI-ROLLA In Partial Fulfillment of the Requirements for the Degree MASTER OF SCIENCE IN ELECTRICAL ENGINEERING 1972 T272fJ 76 pages c. I Approved by f I f ii ABSTRACT The primary objective of this investigation ~~as to determine the general applicability of Single Phase Earth Return(SWER) system for rural electrification where the load density is low, for example electrification of farms and small villages in emerging nations. The limitations of SWER system of distribution are many and it is neces­ sary to make judicious use of such transmission. In this investigation the construction costs of transmission and distribution by SWER system is compared with single phase and three phase systems for loads of 25KVA and 50KVA. Phase converters are required to operate a three phase motor on a single phase supply. Three different types of static phase converters are discussed and their merits and costs are compared. Four different types of grounding systems are discussed in this study. The heating of earth electrodes due to continuous ground current flowing through the electrodes is investigated. Co-ordination of SWER systems with telecommunication lines is discussed in detail. Dan~er to humans and animals due to potential gradient at the surface of the earth in the vicinity of the grounding system caused by continuous ground current is also investi­ gated in this study. iii ACKNOWLEDGr~ENT The author of this thesis is deeply indebted to Dr. J. D. Morgan, who served as research advisor, for his help, guidance and encourage­ ment during the course of this investigation. The moral encouragement and valuable suggestions of Professor George McPherson, Jr., are highly appreciated. The author would like to thank Dr. J. M. Amos for his help and service as committee member. Thanks go to t1rs. Carol Rodman for typing the manuscript. iv TABLE OF CONTENTS Page ABSTRACT • ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• i i ACKNOWLEDGMENT • •••••••••••••••••••••••••••••••••••••••••••••••••••• iii LIST OF FIGURES ••••••.••••..••••.•.•.•.•.••..•.•..•.•.••.•••••..•••• vi LIST OF TABLES •••••••••••.•••••••••••••..•••.•••.••••••••••••..••• viii I. INTRODUCTION •••••••••.••••••••••••••••••••••••••••••••••••••••• 1 II. ECONOf,UC CONSIDERATION OF S\~ER SYSTEM ••••••••••...•••.•••.•••.. 5 A. TRANSMISSION AND DISTRIBUTION COSTS •••••.•••••••••••••.•••. 5 B. PHASE CONVERTER COSTS .••••••••.•.••••••••••••••••.••..••••. 9 III. TECHNICAL CONSIDERATION OF SWER SYSTEM •.••.••...••••.•.••••••• 15 A. EARTH AS A CONDUCTOR .•.••••••••••.•••.•.•••.•.•••••.•.•••• 15 1. SOIL RESISTIVITY .•.•••...•.••.•••••....•.•••........•• 15 2. DISTRIBUTION OF EARTH CURRENT IN THE GROUND •••.••••••••••.•..•.•••.•.•.••...•••••..•.•. 17 3. RESISTANCE AND INDUCTANCE OF THE GROUND RETURN PATH .•.•.•••••••..••••.••••.•••••••••••. 17 B. GROUNDING ELECTRODES AND GRIDS ••.•...•.•...•....••..•..... 20 1. DEEP DRIVEN ROD OR PIPE ..••••..•..••..•.••..••..•.••.• 21 2. MULTIPLE ELECTRODES IN RECTANGULAR AND SQUARE PATTERN .••.........•.••••....•.••••..••.... 21 3. GRIDS ...••.•..•.••••.••.•••••.....•.....•.•.•••.•.••• • 22 4. CO!VIBINATION OF ROD BEDS AND GRID •.•••.••••.•••.••..•.. 22 C. HEATING OF GROUND ELECTRODES ..•••.....•.....•••.•••.••.•.• 25 D. CO-ORDINATION WITH TELECOMMUNICATION CI RCU ITS .••••••••••••••••••••••••.••••••••••••••••••.••••• 2 7 E. SAFETY . •••••••••.••••••••••••••.•••••••••••••••••••••••••• 33 v Tab1e of Contents (continued) Page 1. STEP VOLTAGE .••••.•••••••.••••.•••••.•••.••••••••.•••• 35 2. TOUC~~ VOLTAGE •••••••••••••••.•••••.••••••••••••••••••• 37 3. REDUCING THE POTENTIAL GRADIENT AT THE SURFACE OF THE EARTH .•••...•.•.•.•.•••.•••••.•...• 38 IV. CONCLUSIONS AND RECOMI~ENDAT IONS .•.••......•.••.....••..•.•...• 43 BIBLIOGRAPHY .••.••....•••.•••.•.•.•...•...••...•.••.•...•••.••.••••• 45 VITA ..........•.•.•................................................. 47 APPENDICES .•..••••..••..•.•.•.•.•••.•.••..••.••••••.•.•.•••••••.••.• 48 A. CALCULATION OF CIRCUIT ELEMENTS FOR CAPACITOR TYPE PHASE CONVERTER ........••.•••....•••••.•..•• 49 B. CALCULATION OF CIRCUIT ELEMENTS FOR CAPACITOR-REACTOR TYPE PHASE CONVERTER •••.....•.••••..•..•. 53 C. CALCULATION OF CIRCUIT ELEMENTS FOR AUTO TRANSFORMER-CAPACITOR TYPE PHASE CONVERTER ..•.•.•.....••.•• 58 D. CALCULATION OF TEMPERATURE RISE OF GROUND ELECTRODES ••.•••••.•••.•.•..•.••.•...•.............• 64 E. CALCULATION OF ELECTROSTATICALLY INDUCED VOLTAGE IN TELEPHONE LINE .......••.....•.....•.........•..• 66 vi LIST OF FIGURES Figure Page 1. SCHEMATIC DIAGRAM FOR SWER •.•••••.••••.••...••••••••.••.•••.•.•. 3 2. PERCENTAGE SAVING OF SWER(WITHOUT ISOLATING TRANSFORMER) AS COMPARED WITH OTHER SCHEMES •.••••••••••••..••••• ? 3. PERCENTAGE SAVING OF SWER(WITH ISOLATING TRANSFORMER) AS COMPARED WITH OTHER SCHH1ES •...•..••••.....•.••. 8 4. COST OF SINGLE PHASE AND THREE PHASE INDUCTION f~OTOR VERSUS MOTOR H. P.•••••..•.•••••••.••••••••••..••...•••.•• 10 5. COST OF PHASE CONVERTER AND t-1AGNETIC STARTER VERSUS LOAD r~.P ................................................. l3 6. COST OF PHASE CONVERTER PLUS THE COST OF THREE PHASE INDUCTION MOTOR VERSUS MOTOR H.P •••••..•.•.....••..•.•••• l4 7. SOIL RESISTIVITY VERSUS MOISTURE, TEMPERATURE AND SALT CONTENT ••••••••••...••.••.•....••••.••••..•••••.•••... l6 8. RESISTANCE OF MULTIPLE ELECTRODES OF VARIOUS SPACING AND OF DEPTH 3m IN TERMS OF % RESISTANCE OF ELECTRODE AS A FUNCTION OF NUMBER OF ELECTRODES •••.•••.....•••••..••...•. 23 9. CURVES OF COEFFICIENTS K1 AND 1~2" •••••••••••••••••••••••••••••• 24 10. PERMISSIBLE CURRENT VERSUS SOIL RESISTIVITY FOR A TEMPERATURE RISE OF 60°C ..••........•...•..............•. 28 11. MUTUAL INDUCTANCE BETWEEN SWER LINE AND TELEPHONE LINE VERSUS DISTANCE OF SEPARATION •••.•...••....•.•.•..•...•..• 31 12. ELECTROSTATIC AND ELECTROMAGf~ETIC INDUCTION VERSUS SEPARATION BETWEEN SWER LINE AND TELEPHONE LINE .••••••.•.•••.•• 32 13. HARMONIC CURRENT DISTRIBUTION UNDER SWER POWER LINE •••.•.•.•••• 34 vii List of Figures (continued) Page 14. POTENTIAL GRADIENT IN THE VICINITY OF THE ELECTRODE OF SCHEME(a) .•••••.••••••••••.••.••••••••••••••.•••• 40 15. POTENTIAL GRADIENT IN THE VICINITY OF THE ELECTRODE OF SCHEME(b) ••.•••.••••••.••••••••.••.•.•••••••••••• 41 16. CAPACITOR TYPE PHASE CONVERTER •••••••••.••••.•••...••.•••••.•• 49 17. CAPACITOR-REACTOR TYPE PHASE CONVERTER •••••••••.•••••••••••••• 53 18. AUTO-TRANSFORMER CAPACITOR TYPE PHASE CONVERTER .•••••.•••.•••• 58 19. SPHERICAL ELECTRODE •..••••••.••••••••••••••••••••••••••••••••• 64 20. ELECTROSTATICALLY INDUCED E.~1. F. IN TELEPHONE LINE •••.•••••.•..•••••••••.•••..•..•.•.••..•••••..•••••••••••• 66 viii LIST OF TABLES Table Page I. SOIL RESISTIVITY •••••••••••••••..•..•.••••••••••••..••.•.••••. 15 II. GROUND PATH RESISTANCE AND DIAMETER OF COPPER CONDUCTOR HAVING THE SAME RESISTANCE PER ~1 •••••••••.••••••••• 19 III. RESISTANCE OF VARIOUS EARTH ELECTRODES •••••.••••••.•••.•.•••.. 26 1 I. INTRODUCTION More than 85% of the population of India is in villages. The progress of the nation depends mainly on the progress of the rural population. A majority of the village population is engaged in agri­ culture and small percentage in small scale industries of a varied nature. To improve the rural economy, it is necessary to adopt modern methods of agriculture and mechanisation of small scale industries. The Govt of India is running a 11 Grow more food 11 campaign, thus giving the improvement of rural economy a high national priority. One of the ways this can be attained is by supplying electric power to the rural areas. Rural India comprises a very large number of sparsely populated villages located at varying distances all over the country. The villages v-1hich have populations above 2000 are already electrified with three phase or single phase supply. Their number is only 10% of the total number of villages in India. The rest of the villages are 10 to 15 krns a~Jay from the present supply 1 i nes and have populations less than 2000. Most of the villages have a population of 500 or even less. The electrical load is mostly water pumps for irrigation and domestic lighting. In some villages there may be some processing industries based on agriculture products. The demand for electric power is mostly seasonal and that too with very low load factor except for domestic lighting. Hence the supplier of electric pm1er has great difficulty in equating revenue and expenditure. To close the gap every attempt is made to develop load demand and to effect a reduc­ tion in capital, operation
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