Explain the procedure and significance of temperature rise test with necessary figure and its co-relation with rated normal current.
[7 marks]Write any seven causes of disturbance in power quality examine their effect on power quality and write remedies for each disturbance of electric power supply.
[7 marks]State the checks to be carried out at site prior to commissioning of electric motors.
[7 marks]Describe the principle of fiber optic data transmission with necessary figure.
[7 marks]Define briefly the following terms in power cable:
[7 marks]Operating capacitance b) charging currents c) reactive power d) leakage currents e) continuous current carrying capacity f) inductance g) effective d.c. resistance.
[ marks]What are the causes of failure of a circuit-breaker? Explain the procedure of failure analysis.
[7 marks]Explain the working principle of Megger with necessary figure and Procedure of its use.
[7 marks]What is load shedding? Why is it necessary? How is it carried out and where?
[7 marks]Explain the procedure of drying out of electric motor using the (1) radiating lamp (2) drying chambers and resistor heaters.
[7 marks]Describe the purpose, test set-up and procedure of power frequency withstand test on power transformer.
[7 marks]State and explain the types of constructions of voltage transformers and their applications.
[7 marks]Illustrate the schematic of bipolar 2-terminal HVDC link and define functioning of all parts of it.
[7 marks]Give summary of auxiliary systems in substations and state their functions.
[7 marks]Describe the second characteristic numeral in the standard designation of cooling system.
[7 marks]Prepare the sequence of tripping the main circuit-breaker, unit auxiliary circuit- breaker and field circuit breaker in the generating unit scheme.
[7 marks]Explain the seven principles of safety management in electrical plants.
[7 marks]Describe the test set-up and test procedure of switching impulse test with necessary figure.
[7 marks]