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Short Circuit Current Calculation
ABSTRACT
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| Short Circuit Current Calculation |
This thesis is about calculating the short-circuit current on an overhead high voltage transmission line. The intention is to provide engineers and technicians with a better understanding of the risks and solutions associated with power transmission systems and its electrical installations. Two methods (“Impedance method” and “Composition method”) have been described to facilitate with the computation of the short-circuit current. Results yielded from these calculations help network administrators to select the appropriate protective devices to design a secured system. Description and implementation of these protective devices are explained and the procedure on how to ensure reliability and stability of the power system is shown.
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The “Composition method” deals with the concept of “short-circuit power”. Short-circuit power is the largest possible value of power that the network can provide during a fault, it is totally depended on the impedance of the components and also how the components are setup in the network. In reality this method is more useful because the value of the short-circuit power at the point pole is provided by the suppliers and this value is considered to be the total short-circuit power at that point, which also takes into account the impedance of the entire power net. When short-circuit occurs in a point along the transmission line, first the short-circuit power at that point is calculated and then the short-circuit current is calculated by using a simple formula. The short-circuit power at the point of the fault is calculated by calculating the total impedance at that point from the point pole (including the impedance of the point pole). From the impedance the short-circuit power is easily calculated.
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Table Of Contents
CHAPTER 1: INTRODUCTION
1.1 ELECTRICAL POWER TRANSMISSION SYSTEM
1.2 CHALLENGES FACED DURING POWER TRANSMISSION
1.2.1 Dangers of short-circuits
1.2.2 Causes of short-circuits
1.2.3 Prevention of short-circuits
1.3 USEFUL PLACES FOR SHORT-CIRCUIT CURRENT CALCULATION
1.4 OVERVIEW
CHAPTER 2: LITERATURE SURVEY
2.1 TRANSMISSION LINES
2.1.1 Introduction
2.1.2 Requirement of transmission lines
2.2 SHORT-CIRCUIT
2.2.1 Introduction to the short-circuit phenomenon
2.2.2 Types of short-circuit
2.2.3 Short-circuit current
2.2.4 Parameters of short-circuit current
2.3 CALCULATION METHOD
2.3.1 Introduction
2.3.2 Theory for calculating short-circuit current using the impedance method
2.3.2.1 Generators
2.3.2.2 Transformers
2.3.2.3 Transmission Lines
2.3.2.4 Other circuit impedances
2.3.3 Theory of calculating short-circuit current using the “composition method”
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CHAPTER 3: MATHEMATICAL DESIGN
3.1 SHORT-CIRCUIT CALCULATION USING THE IMPEDANCE METHOD
3.2 SHORT-CIRCUIT CALCULATION USING THE COMPOSITION METHOD
3.2.1 Case 1
3.2.1.2 The second section is the transmission line from P to A
3.2.1.3 The third section contains the transformer between A and B.
3.2.2 Case 2
CHAPTER 4: SOFTWARE DEVELOPMENT
CHAPTER 5: LABORATORY WORK
5.1 INTRODUCTION
5.2 SCHEMATIC CIRCUIT DIAGRAM
5.3 HARDWARE IMPLEMENTATION
5.3.1 Components description
5.3.2 Hardware setup
5.4 FEEDER PROTECTION RELAY
5.4.1 Description
5.4.2 Operation Indicators
5.4.3 RELAY SETTINGS
CHAPTER 6: CONCLUSION AND FUTURE WORK
6.1 CONCLUSION
6.2 FUTURE WORK
REFERENCES
APPENDIX A: SPECIFICATION OF THE FEEDER PROTECTION RELAYS
APPENDIX B: CONFIGURATION OF THE FEEDER PROTECTION RELAYS
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Short Circuit Current Calculation
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