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Power system is made up of various equipments like generator , transformer , bus bar , transmission line etc . which are protected by protective relaying systems . Function of relay are dependability , security , speed of operation , selectivity , single failure criterion etc .Protection schemes are divided into two parts – Equipment protection and system protection . Information required for protective setting are
Line parameters : It is used to calculate various parameters like resistance , reactance and susceptance etc.
Transformer parameter : positive and zero sequence impedence values are obtained by this parameter .
Terminal Equipment rating : single line diagram is used to obtain the data . Transfer capability is restricted by rating of terminal equipment such as CB , CT , line trap and links.
CT and VT ratios : These are used in protection diagram . These ratios are verified by measuring load currents on site and compared it with a known ratio .
Benefits of power system protection are enhanced power quality , Prevent damaging of healthy equipment ,Private plants are less hazards ,More stability and integrity .
Power systems Sample Assignment:
Understanding the environmental impacts of engineering design. Experience in managing resources and working within constraints to achieve specified goals. Ability to model and predict the operation of power system components, including their steady-state and transient behaviour. Ability to analyse and design simple power system components. Experience in applying first-principles to the analysis of complex problems. Experience in 3-phase power equipment measurements. Experience with computer simulations of power systems. Experience in the production of technical documentation. Confidence in applying theoretical concepts to practical situations, as dictated by industrys’ needs. Potential to respond to new requirements in power generation, such as sustainability.
Competence in seeking, accessing, retrieving and evaluating knowledge, technologies and tools from external sources. Ability to make simplifying and valid engineering assumptions in the analysis or design of a system. Familiarity with the process of conceptualisation and formulation of problems in terms of a mathematical model, and then being able to find a solution to the original problem.
The subject is structured into two modules, and content is organized as follows:
System Components and Steady-State. You will develop a knowledge of 3-phase power systems, voltage, current and power relationships, load and generation characteristics, 3-phase power transformers, capacitance, inductance and equivalent circuits of power lines and cables, calculation of faults using symmetrical components. Transient Analysis. You will develop an understanding of computer analysis of 3-phase switching transients, and 2-machine electromechanical transients Introduction to Power system Overview of power system -power in single phase AC system - complex power -three phase systems - power in three phase balanced system - power transformers -equivalent circuit of a transformer - auto transformers -tap changing transformers.
Per unit system, power flow and load modeling Per unit system with applications -power flow between two nodes -load modeling concepts and different load models. Transmission line parameters Resistance of the transmission line - inductance of single conductor - inductance of single phase two wire system -inductance of 3 phase system -inductance of stranded and bundled conductors - double circuits - capacitance of two wire conductor -capacitance of three phase line - effect of earth on line capacitance - capacitance of bundled conductors - capacitance of double circuit. Transmission line model Short transmission line model - medium length line model or nominal π model - long transmission line model - voltage and current waves - surge impedance loading of the line. Symmetrical components and fault analysis Symmetrical faults
Analysis of three phase symmetrical faults - determination of short circuit capacity (SCC) - fault analysis using Z-bus matrix - numerical examples. Symmetrical components Basics of symmetrical components - sequence impedance of a star connected load - sequence impedance of a transmission line - sequence impedance of synchronous generator - sequence network of a loaded synchronous
Analysis of different types of three phase unsymmetrical faults-Z-bus matrix using symmetrical components - fault analysis using Z-bus matrix - numerical examples. Power system transients Transients with AC source -re-striking voltage -double frequency transients -traveling waves on transmission lines traveling waves in open end line and short circuited line -line terminated through a resistance.
Swing equation -single machine on infinite bus (SMIB) model -rotor angle response to sudden change in power input -equivalent single machine system -stability based on equal area criterion -stability during sudden input power change -stability during 3 phase fault -numerical example.
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Topics for Power System Protection assignment help include :
- Concepts of protection,Unit protection,Non unit protection,Zones of protection,Fuses,Electromechanical relays,Electronic relays,Numerical technologies,Current ,Voltage transformers ,Non conventional transducers,Overcurrent protection by fuses Overcurrent relays,Unit protection of feeders ,Traditional feeders ,Digital feeders
- Communications for protection,Three phase distance protection ,Three phase distance schemes,Directional earth fault protection schemes,Distance relaying,Numerical distance relaying,Transformer protection,Busbar protection ,Frame earth,Differential,Numerical schemes
- Motor protection ,Stator winding,Overload,Phase unbalanced,Generator protection ,Short circuit,Stator earth,Rotor earth ,Embedded generation ,Utility network protection,Auto reclosure relaying,Substation automation ,Protection,Control,Automation ,Intelligent electronic device,Protection fundamentals
Help for complex topics include :
- Generator protection
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- Line protection
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