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How is the induced voltage of separately excited dc generator affected if the exciting current is reduced?
In a separately excited DC generator, the induced voltage is directly related to the magnetic field strength produced by the field winding, which is influenced by the exciting current. If the exciting current is reduced, the magnetic field strength decreases, leading to a reduction in the induced voltage. Consequently, the output voltage of the generator will decrease as the field strength diminishes, assuming all other factors remain constant.
Why does voltage increase with current with separate excitation?
More current in the field coils means a stronger magnetic field for the armature to rotate in. This causes the output voltage for a generator to increase. For a motor, more magnetic field means that the supply voltage can be matched at a slower armature rotation speed, so the motor runs more slowly but can supply more torque.
What are the differences of Long shunt vs short shunt generator?
In long shunt the shunt field winding is in parallel to both generator and series field. In short shunt the shunt field is in parallel to generator only.
How does the avr automatically maintain a constant voltage level in a generator?
The AVR (automatic voltage regulator) measures the generator voltage output and varies the field voltage (which varies the strength of the rotating magnetic field) to maintain a fixed output voltage. Some generators excite (power) the AVR and field windings from the main stator, some provide a separate stator winding just for field excitation, and others provide a separate stator winding and rotating permanent magnets (called PMG) for field excitation. The generators that do not have permanent magnets rely on residual magnetism for the initial voltage to start the system or may provide initial voltage from the engine's starting battery.
How can a 24 v battery start a 80 kw emergency generator?
The 24v battery is used to provide the initial field current. This couples to the stator windings, and as the generator spins induces a voltage on the stator windings, which causes back EMF onto the field windings (when load is present), which slows the generator's spin until the governor kicks in to bring it back up to speed. The important thing to note is the output power of the generator is not a factor of the 24v field voltage, it is directly dependent upon the fuel being used to get the generator spinning. The 24 volts just "jump starts" the field voltage. Think of it as synonymous with the 12 volt battery that starts your car.
What thing can we do to increase the size of the current the generator produces?
To increase the size of the current the generator produces, you can increase the strength of the magnetic field, increase the speed of rotation of the generator, or increase the number of turns in the generator coil. These factors all contribute to the overall output of the generator.
How can you increase the amount of electric current produce by generator?
To increase the amount of electric current produced by a generator, you can increase the rotational speed of the generator, increase the strength of the magnetic field within the generator, or increase the number of turns in the generator coils. These methods will result in a higher induced voltage and therefore a higher electric current output.
How do you increase the amount of current created by a generator?
You can use a transformer to increase the current. Note that this will also decrease the voltage. The total energy will not increase; it will decrease slightly, due to losses in the transformer.
What are two ways you can change a generator to generate more electricity?
Increase the rotational speed of the generator by using a more powerful prime mover like a larger engine or turbine. Increase the strength of the magnetic field within the generator by adding more coils of wire or using stronger magnets.
How can increase strength of magnetic field?
To increase the strength of a magnetic field, you can use a stronger magnet or increase the current flowing through a wire in an electromagnet. You can also increase the number of coils in an electromagnet to enhance its magnetic field strength. Additionally, bringing magnetic materials closer to the magnet can also increase the overall magnetic field strength.
The amount of voltage output of the AC generator is related to?
field strength
What affect does a changing magnetic field strength have on an ac generator power output?
By increasing the field current (current flowing through the rotor windings), the magnetic field generated by these windings will increase. This increased magnetic field will result in a larger current flow in the stator windings (the output of the generator). This in turn causes a larger pull against the rotation of the rotor, causing it to slow down. The governor will then kick in, allowing more steam/ power to the prime mover to keep speed steady. Assuming all is working correctly, the output power will increase as the magnetic field is increased (to a limit).
What are Two ways for increasing strength of an electric field?
Increasing the voltage or decreasing the distance between the charges will increase the strength of an electric field. Additionally, increasing the amount of charge that creates the field will also increase its strength.
What determines the strength of two fields in a generator?
The strength of two fields in a generator is determined by the amount of current flowing through the coils of wire creating the fields and the number of turns in the coils. Additionally, the strength of the magnetic field can be affected by the type of materials used in the construction of the generator.
How is the induced voltage of separately excited dc generator affected if the exciting current is reduced?
In a separately excited DC generator, the induced voltage is directly related to the magnetic field strength produced by the field winding, which is influenced by the exciting current. If the exciting current is reduced, the magnetic field strength decreases, leading to a reduction in the induced voltage. Consequently, the output voltage of the generator will decrease as the field strength diminishes, assuming all other factors remain constant.
What would you do to change the direction and increase the strength of the field?
To change the direction of the magnetic field, you can reverse the direction of the current flow in a wire or change the orientation of the magnet. To increase the strength of the magnetic field, you can increase the current flow in a wire, increase the number of coils in a solenoid, or use a stronger magnet.
Why magnetic field lines are closer at the bottom?
Magnetic field lines are closer at the bottom of a magnet because the magnetic field strength is stronger in that region. This increase in field strength causes the field lines to compress closer together. The field lines spread out as they move away from the magnet, resulting in the characteristic pattern of magnetic field lines emerging from the poles and converging at the other side.
