A parallel-plate capacitor is made from two sheets of metal, each with an area of 1.0 square meter, separated by a sheet of plastic 1.0 millimeter (10 m) thick, as shown above. The capacitance is measured to be 0.05 microfarad (5 x 10* F). -3 a. What is the dielectric constant of the plastic? b. The uncharged capacitor is connected in series with a resistor R = 2 x 10° ohms, a 30-volt battery, and an open switch S, as shown above. The switch is then closed. i. What is the initial charging current when the switch S is closed? ii. What is the time constant for this circuit? iii. Determine the magnitude and sign of the final charge on the bottom plate of the fully charged capacitor. iv. How much electrical energy is stored in the fully charged capacitor? After the capacitor is fully charged, it is carefully disconnected, leaving the charged capacitor isolated in space. The plastic sheet is then removed from between the metal plates. The metal plates retain their original separation of 1.0 millimeter. What is the new voltage across the plates? d. If there is now more energy stored in the capacitor, where did it come from? If there is now less energy, what happened to it?
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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