Q1) Short answer questions: a. (True or False)A double line to ground short circuit fault at phases A and B will have the same magnitude as a double line to ground short circuit fault at phases A and C at the same location. b. How many unique symmetrical components are there for a set of three unbalanced phasors? c. (True or False)Symmetrical components are used to analyze symmetrical faults. d. (True or False) The negative sequence voltage of a generator have the same voltage magnitude and -120° phase shift between each consecutive phases. e. (True or False) The current passing through the zero sequence equivalent of a delta- delta connected three phase transformer in case of a solid double line to ground fault is larger in magnitude than that of a double line to ground fault through a grounding impedance. f. (True or False) The zero sequence components of three phase components are equal in phase but not equal in magnitude. g. When analyzing unbalanced three phase faults in class we always started with two constraints. What were these constraints on? What did the constraint depend on? h. Can we use the double line to ground fault analysis to analyze all double line faults? i. (True or False)A short circuit fault at a specific bus affects the injection current at all busses in the system. j. (True or False) A short circuit fault at a specific bus affects the voltage at all busses in the system.
Protection System
A system that protects electrical systems from faults by isolating the problematic part from the remainder of the system, preventing power from being cut from healthy elements, improving system dependability and efficiency is the protection system. Protection devices are the equipment that are utilized to implement the protection system.
Predictive Maintenance System
Predictive maintenance technologies are designed to assist in determining the state of in-service equipment so that maintenance can be scheduled. Predictive maintenance is the application of information; proactive maintenance approaches examine the condition of equipment and anticipate when it should maintain. The purpose of predictive maintenance is to forecast when equipment will fail (depending on a variety of parameters), then prevent the failure through routine and corrective maintenance.Condition monitoring is the continual monitoring of machines during process conditions to maintain optimal machine use, which is necessary for predictive maintenance. There are three types of condition monitoring: online, periodic, and remote. Finally, remote condition monitoring allows the equipment observed from a small place and data supplied for analysis.
Preventive Maintenance System
To maintain the equipment and materials on a regular basis in order to maintain those running conditions and reduce unnecessary shutdowns due to unexpected equipment failure is called Preventive Maintenance (PM).
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