The current flowing through the armature conductors creates a magnetic field, which is called as armature flux. This armature flux distorts and weakens the magnetic flux produced by the main poles. This effect of armature flux on the main flux is known as armature reaction.
How armature reaction is produced in DC generator?
How an armature reaction is produced?
What is armature reaction and commutation in a DC machine?
What is armature reaction and how many kinds of armature reactions are there?
There are two types of magnetic fluxes working in DC generator like the main flux & armature flux. Here the primary flux will occur due to the stator poles whereas the second flux will occur due to the flow of current within the armature.
What voltage of on load tap changer is required for unit transformer?
On-load tap-changer is controlled by CBM IED (110 kV) or on-load tap-changer control IED (220 kV), (6) The on-load tap-changer control is implemented via the logical node ATCC.
What is main field flux?
The current flowing through the armature conductors creates a magnetic field, which is called as armature flux. This armature flux distorts and weakens the magnetic flux produced by the main poles. This effect of armature flux on the main flux is known as armature reaction.
How do you measure the speed of a DC motor?
Speed of a DC Motor
For a given DC motor, the (60A/PZ) = K (say) is a constant. Hence, the speed of a DC motor is directly proportional to back emf and is inversely proportional to flux per pole.
What is back emf in motor?
Back EMF is the system in the coil of an electric motor that opposes the current flowing through the coil, when the armature rotates. When the speed varies, the winding characteristics may fluctuate, resulting in variation of back EMF.
What is use of transformer oil?
Transformer oil is used to insulate high-voltage electrical infrastructure such as transformers, capacitors, switches and circuit breakers. Transformer oils are designed to operate effectively at very high temperatures, cooling, insulating, and stopping corona discharges and arcing.
How is an armature reaction created in a DC generator?
The current flowing through the armature conductors creates a magnetic field, which is called as armature flux. This armature flux distorts and weakens the magnetic flux produced by the main poles. This effect of armature flux on the main flux is known as armature reaction.
What’s a armature?
Definition of armature
1 : an organ or structure (such as teeth or thorns) for offense or defense. 2a : a piece of soft iron or steel that connects the poles of a magnet or of adjacent magnets.
How does a separately excited DC motor work?
A separately excited dc motor is a motor whose field circuit is supplied from a separate constant-voltage power supply, while a shunt dc motor is a motor whose field circuit gets its power directly across the armature terminals of the motor.
How do you find the pole of a motor?
The actual running speed is the synchronous speed minus the slip speed. To determine the number of poles, you can read the data plate directly or calculate it from the RPM stated on the data plate or you can count the coils and divide by 3 (poles per phase) or by 6 (pairs of poles per phase).
How do you change the rotation of a DC motor?
Of course, the direction of current is controlled by the polarity of the voltage. So in order to change the direction of rotation, we can simply reverse the voltage, causing the current to flow in the opposite direction, changing the force by 180 degrees and the motor to be driven ‘backwards’.
What is the difference between DC generator and DC motor?
A dc motor is a machine powered by electricity to produce mechanical energy. A dc generator is a machine powered by mechanical energy to produce electricity. A dc motor and a dc generator are the two sides of the same coin.
Can transformer oil catch fire?
The temperature of the mineral oil inside the transformer tank increases, forming flammable vapour that is suddenly released from an opening in the tank into the surrounding atmosphere. Although the probability of transformer fires and explosions is relatively low, it is not negligible.
Is transformer oil edible?
It is not exactly edible, though, as the transformer oil contains toxic polychlorinated biphenyls (PCBs), which have been illegal in the U.S. since 1979. But still, chefs are using the stolen oil to make chips and other fried foods.
How does a booster transformer work?
How Does it Work? A buck-boost transformer works by taking input voltage from the primary side of the transformer and stepping it up or down – depending on the preferred configuration. Rectified voltage is then provided on the secondary side (output), where it can be used by a connected device or machine.
How do you adjust a transformer tap?
The easiest way to change the output of a transformer is by either changing its input voltage or by changing the number of turns in the windings. Tap changer switches provide an external means to accomplish this voltage adjustment.