Voltage Build Up Process Of Dc Generator. Generated voltage vs filed current curve [1]. This process is continued till the generator builds up the rated voltage.
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When the armature is rotated, the residual flux in the field winding will induce a small voltage in the armature. The voltage regulation of a dc generator is the change in voltage. As there is small voltage is there across the terminals of dc shunt generator and switch s is closed, therefore a small current will start flowing through the field circuit of dc shunt generator which in turn will produce magnetic flux and if the produced magnetic flux adds the residual magnetic flux then net flux will increase and the generated voltage (e a = k a øω m).
Self Excited Dc Generator [2].
The simple parallel connection plays a major role in voltage built up in the shunt generator. If the poles lost its residual magnetism it cant start voltage build up process. This article describes the flashing system and output build up process for many dc generator machines that also produce ac auxiliary power.
How The Voltage Is Built Up In A Dc Shunt Generator?
The connections of the field winding should be such that the field current strengthens the residual magnetism. As there is small voltage is there across the terminals of dc shunt generator and switch s is closed, therefore a small current will start flowing through the field circuit of dc shunt generator which in turn will produce magnetic flux and if the produced magnetic flux adds the residual magnetic flux then net flux will increase and the generated voltage (e a = k a øω m). Voltage building in shunt generator:
Conditions For Voltage Build Up The Presence Of Residual Flux.
The process of voltage building, in the case of these generators requires that the field system should always have some residual magnetism. Machines may be magnetized by current obtained from a separate source, such as a battery or an auxiliary dynamo called an exciter, or may generate their own magnetizing current. 3.total field circuit resistance must be less than t critical value 4.armature speed must be very high
Voltage Build Up Process Fig.2:
The voltage regulation of a dc generator is the change in voltage. When the load is reduced from rated value to zero expressed as a percentage of voltage regulation. 1.there must be some residual flux 2.field winding mmf must aid the residual.
This Process Is Continued Till The Generator Builds Up The Rated Voltage.
We will see about what are the interesting things happen in magnetization and load characteristics of self excitation machine. When this voltage is fed back to the field circuit it. The voltage build up in a dc generator depends upon the presence of the residual flux in the field poles of the generator.
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