t= 0 O40-ww- R1 iz(t) Vs R2
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).
The inductor L in the circuit shown in Figure P5.36
is the coil of a relay. When the current through the coil
is equal to or greater than +2 mA, the relay functions.
Assume steady-state conditions at t < 0. If
VS = 12 V, L = 10.9 mH, R1 = 3.1 kΩ
determine R2 so that the relay functions at t = 2.3 s.
For t < 0,
The current through the inductor is zero.
As the inductor does not allow the sudden change in the current, hence the current just after the switch is closed will be zero.
Draw the circuit just after the switch is closed.
Find the voltage across the inductor using nodal analysis.
Compare the equation with the standard first-order differential equation and find the value of the time constant.
Redraw the circuit for t = ∞.
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