Over voltage and under voltage control using relay essay

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Over voltage and under voltage control using relay essay

Due to the logarithmic shape of diode V-I curves, the voltage across the diode changes only slightly due to changes in current drawn or changes in the input. When precise voltage control and efficiency are not important, this design may be fine.

Since the forward voltage of a diode is small, this kind of voltage regulator is only suitable for low voltage regulated output. When higher voltage output is needed, a zener diode or series of zener diodes may be employed.

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Feedback voltage regulators operate by comparing the actual output voltage to some fixed reference voltage. Any difference is amplified and used to control the regulation element in such a way as to reduce the voltage error.

This forms a negative feedback control loop ; increasing the open-loop gain tends to increase regulation accuracy but reduce stability. Stability is avoidance of oscillation, or ringing, during step changes. There will also be a trade-off between stability and the speed of the response to changes.

If the output voltage is too low perhaps due to input voltage reducing or load current increasingthe regulation element is commanded, up to a point, to produce a higher output voltage—by dropping less of the input voltage for linear series regulators and buck switching regulatorsor to draw input current for longer periods boost-type switching regulators ; if the output voltage is too high, the regulation element will normally be commanded to produce a lower voltage.

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However, many regulators have over-current protection, so that they will entirely stop sourcing current or limit the current in some way if the output current is too high, and some regulators may also shut down if the input voltage is outside a given range see also: Circuit design for a simple electromechanical voltage regulator.

A voltage stabilizer using electromechanical relays for switching. Graph of voltage output on a time scale. In electromechanical regulators, voltage regulation is easily accomplished by coiling the sensing wire to make an electromagnet. The magnetic field produced by the current attracts a moving ferrous core held back under spring tension or gravitational pull.

As voltage increases, so does the current, strengthening the magnetic field produced by the coil and pulling the core towards the field.

Over voltage and under voltage control using relay essay

The magnet is physically connected to a mechanical power switch, which opens as the magnet moves into the field. As voltage decreases, so does the current, releasing spring tension or the weight of the core and causing it to retract. This closes the switch and allows the power to flow once more.

If the mechanical regulator design is sensitive to small voltage fluctuations, the motion of the solenoid core can be used to move a selector switch across a range of resistances or transformer windings to gradually step the output voltage up or down, or to rotate the position of a moving-coil AC regulator.

Essentially, the relay s employed pulse width modulation to regulate the output of the generator, controlling the field current reaching the generator or alternator and in this way controlling the output voltage producing back into the generator and attempting to run it as a motor.

The rectifier diodes in an alternator automatically perform this function so that a specific relay is not required; this appreciably simplified the regulator design. More modern designs now use solid state technology transistors to perform the same function that the relays perform in electromechanical regulators.

Electromechanical regulators are used for mains voltage stabilisation — see AC voltage stabilizers below. Automatic voltage regulator[ edit ] Voltage regulator for generators. Generators, as used in power stations or in standby power systems, will have automatic voltage regulators AVR to stabilize their voltages as the load on the generators changes.

The first automatic voltage regulators for generators were electromechanical systems, but a modern AVR uses solid-state devices. An AVR is a feedback control system that measures the output voltage of the generator, compares that output to a set point, and generates an error signal that is used to adjust the excitation of the generator.

As the excitation current in the field winding of the generator increases, its terminal voltage will increase.AET Suspension and Control Systems.

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For over voltage and under voltage a kit is used which measure the over voltage and under voltage, in case if the limit exceed then , system will be turn off, or it will turn off the system when voltage decrease then v.

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The voltage drop should be taken into account, particularly when using a fuse in low-voltage applications. which rely on melting processes where no mechanical operation is required for the fuse to operate under fault conditions.

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