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Flashing the field of DC generator means:
- a)Neutralising residual magnetism
- b)Creating residual magnetism by a DC source
- c)Making the magnetic losses of force parallel
- d)ncreasing flux density by adding extra turns of windings on poles
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
Flashing the field of DC generator means:a)Neutralising residual magne...
Residual magnetism in the generator exciter field allows the generator to build up voltage during starting. This magnetism is sometimes lost due to improper operation. Restoring this residual magnetism is possible by using a DC source. It is sometimes referred to as flashing the exciter field.
Most Upvoted Answer
Flashing the field of DC generator means:a)Neutralising residual magne...
Explanation:
Flashing the field of a DC generator means creating residual magnetism by a DC source. This is done to initiate the generation process, as the generator needs a magnetic field to start generating electricity. The following are the details about flashing the field of a DC generator:
Creating Residual Magnetism:
To flash the field of a DC generator, a DC source is connected to the field winding of the generator. The DC source creates a magnetic field in the field winding, which induces magnetic flux in the poles. This magnetic flux induces residual magnetism in the poles, which stays even after removing the DC source.
Initiating Generation Process:
The residual magnetism in the poles helps in initiating the generation process. When the generator is started, the residual magnetism induces a small amount of voltage in the armature winding. This voltage is enough to excite the field winding, which in turn, strengthens the magnetic field. This strengthens the voltage induced in the armature winding, which further strengthens the magnetic field. This process continues until the generator reaches its rated voltage.
Neutralizing Residual Magnetism:
If the residual magnetism in the poles is in the opposite direction, it can cause a decrease in the output voltage of the generator. In such cases, flashing the field of the generator helps in neutralizing the residual magnetism.
Conclusion:
Flashing the field of a DC generator is an important process as it helps in initiating the generation process. It is done by creating residual magnetism in the poles by connecting a DC source to the field winding of the generator.
Flashing the field of a DC generator means creating residual magnetism by a DC source. This is done to initiate the generation process, as the generator needs a magnetic field to start generating electricity. The following are the details about flashing the field of a DC generator:
Creating Residual Magnetism:
To flash the field of a DC generator, a DC source is connected to the field winding of the generator. The DC source creates a magnetic field in the field winding, which induces magnetic flux in the poles. This magnetic flux induces residual magnetism in the poles, which stays even after removing the DC source.
Initiating Generation Process:
The residual magnetism in the poles helps in initiating the generation process. When the generator is started, the residual magnetism induces a small amount of voltage in the armature winding. This voltage is enough to excite the field winding, which in turn, strengthens the magnetic field. This strengthens the voltage induced in the armature winding, which further strengthens the magnetic field. This process continues until the generator reaches its rated voltage.
Neutralizing Residual Magnetism:
If the residual magnetism in the poles is in the opposite direction, it can cause a decrease in the output voltage of the generator. In such cases, flashing the field of the generator helps in neutralizing the residual magnetism.
Conclusion:
Flashing the field of a DC generator is an important process as it helps in initiating the generation process. It is done by creating residual magnetism in the poles by connecting a DC source to the field winding of the generator.
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