0
What type of current flows in stator and rotor winding of a dc shunt generator?
Wiki User
∙ 9y ago
The field winding in the stator is exposed to the full current generated by the rotor's winding.
Wiki User
∙ 9y ago
Wiki User
∙ 9y agoDirect current
Add your answer:
Earn +20 pts
Difference between squirrel cage and wound rotor induction motor?
Both have 3 a phase stator winding, the squirrel cage has a rotor with bars arranged around it's periphery, these bars are joined at both ends by a continuous ring. This forms a closed circuit of low resistance which is fixed. The wound rotor (slip ring motor) is similar in construction but the bars are replaced by copper windings, similar to those in the stator. They are star connected and the three ends are brought out to slip rings which allow an electrical connection to be made to the outside world. When no connection is made between these ends and the stator is energised, little current flows in the stator which does not turn, but when some resistance is inserted, current flows in the stator windings and the rotor rotates. As the rotor gains speed the resistance is taken out of circuit and the slip rings shorted together. The motor runs as a cage induction motor.
How tertiary winding of power transformer acts as stabilizing winding?
in star-star neutral transformer at unbalanced load condition zerosequnce current will be flows in secondary side but this current can not be balanced by primary side because its not having neutral to circulate zerosequence current.due to this unbalance voltage will appeared in primary side but the tertiary delta winding allows circulate the zerosequence current so the primary voltage will get stabilized.
What is the function of a generator?
There are several different types of generators. I'll explain how a "large" 3 phase synchronous generator works - the type that most likely is generating the power you're using at work or home. The generator is only a small part of a power plant. It is composed of two sets of windings, one on the stator, or stationary part of the generator, and the other mounted on the rotor, or rotating part of the generator. Usually the rotor windings have voltage applied to them by an outside source that is controllable by the power plant operators through what is called the "voltage regulator". A power source is used to spin the rotor. This can be a steam turbine, a wind turbine, and many others. As the rotor spins, it induces current in the stator windings in proportion to the amount of power applied to the rotor windings by the voltage regulator (VR). This current flows out of the stator windings, which are connected to a load through the transmission system. This current, in turn, induces a reverse force (called "back emf") on the rotor winding. The back emf causes the rotor to slow down. As the rotor slows down, the governor (a system that monitors the generator's speed, and keeps it within a certain range) kicks in to speed the generator back up.
What will happen to the transformer if rated voltage is applied to the winding during short circuit test?
If rated voltage is applied to Transformer during S/C test, The secondary winding will burn out due ta heavy current flow through the winding. During S/C test the secondary winding is short circuited so the impedance between phase and neutral is very low(only winding resistance). But the voltage across the secondary winding is rated hence heavy current flows through the winding, as I=V/Z. it depends which rated voltage is applied. if you are talking about primary winding voltage, transformer should withstand the primary rated voltage it's been designed for (OR it has been poorly designed). Otherwise, if rated voltage is the insulation voltage between a winding and earth OR winding-to-winding, you just have to check if: 1 - it is higher than the maximum primary winding voltage the transformer can withstand (could be, could not be..). Then, you can guess if your transformer is likely to burn or not. 2 - your test setup (usually a HV generator connected between primary and secondary winding) can deliver the requested current for the setup. I guess this won't be the case, since HV testers are usually designed to generate high voltages, but very small output currents.
What would the power loss be if the series field winding of dc motor connected directly across the 240 V dc supply?
Detailed Solution. For a constant back emf, flux is inversely proportional to the speed of the motor. If field winding is disconnected accidentally, the speed would dangerously increase in order to maintain the back emf of the motor
Working principle of ac motors?
Michael Faradeys laws of electromagnetic induction:When a current is passed through stator winding, an alternating flux created on the stator winding which in turn cuts a rotor winding(wire wound motor)/short circuited copper bar(squirrel cage motor), then a current flows through it and as above one motors works.
What kind of current flows in the armature conductor of a dc generator?
pogi current flow in the armature conductor
If 200V AC generator connected to 200V DC generator then what happens?
current flows in both directions, depending on the AC voltage, i.e when ac is higher, current flows to the dc side, and vice versa
How demagnetize an electric motor?
A transformer winding only produces a magnetic field when current flows through it. Switch the current off, and the magnetic field disappears. You do not need to 'demagnetise' a transformer winding.
Difference between squirrel cage and wound rotor induction motor?
Both have 3 a phase stator winding, the squirrel cage has a rotor with bars arranged around it's periphery, these bars are joined at both ends by a continuous ring. This forms a closed circuit of low resistance which is fixed. The wound rotor (slip ring motor) is similar in construction but the bars are replaced by copper windings, similar to those in the stator. They are star connected and the three ends are brought out to slip rings which allow an electrical connection to be made to the outside world. When no connection is made between these ends and the stator is energised, little current flows in the stator which does not turn, but when some resistance is inserted, current flows in the stator windings and the rotor rotates. As the rotor gains speed the resistance is taken out of circuit and the slip rings shorted together. The motor runs as a cage induction motor.
Fundamental principle of current transducer?
The basic principle of current transformer is same as that of the power transformer. Like the power transformer current transformer also contains a primary and a secondary winding. Whenever an alternating current flows through the primary winding alternating magnetic flux is produced, which then induces alternating current in the secondary winding. In case of current transformers the load impedance or "burden" is very small. Therefore the current transformer operates under short circuit conditions. Also the current in the secondary winding does not depend load impedance but depends on the current flowing in the primary winding.
Is current from a generator flows through the phase line and return through neutral to generator?
Yes, except that the correct term is 'line' conductor, not a 'phase' conductor.
Why are the compensating winding used in dc motor?
compensating winding is used for equal load sharing of two generators running in parallel. while interpole winding is used to minimise the effect of armature reaction by supporting the main field.
How ac generators and dc generators are alike and how they are different?
They both have rotor and stator windings. They create a magnetic field and move a coil of wire through it, thus producing electricity.The AC generator rotates a mageting field inside the stator. As the poles have both a north and south end, the field generated in staor coils is an AC waveform, as the poles reverse the current at each half turn. The power for the rotating coils are supplied with DC current via slip rings and the (excitation) current can be varied to control the output.A DC generator has the magnetic field supplied by the stator coils. The induced current of the rotor windings is taken from the rotating shaft via a commutator, a brush and secored contact area. The induced current therefore is only produced over a small arc of the rotor and thus has the same polarity, (albeit interrupted) DC.
How tertiary winding of power transformer acts as stabilizing winding?
in star-star neutral transformer at unbalanced load condition zerosequnce current will be flows in secondary side but this current can not be balanced by primary side because its not having neutral to circulate zerosequence current.due to this unbalance voltage will appeared in primary side but the tertiary delta winding allows circulate the zerosequence current so the primary voltage will get stabilized.
What is the function of a generator?
There are several different types of generators. I'll explain how a "large" 3 phase synchronous generator works - the type that most likely is generating the power you're using at work or home. The generator is only a small part of a power plant. It is composed of two sets of windings, one on the stator, or stationary part of the generator, and the other mounted on the rotor, or rotating part of the generator. Usually the rotor windings have voltage applied to them by an outside source that is controllable by the power plant operators through what is called the "voltage regulator". A power source is used to spin the rotor. This can be a steam turbine, a wind turbine, and many others. As the rotor spins, it induces current in the stator windings in proportion to the amount of power applied to the rotor windings by the voltage regulator (VR). This current flows out of the stator windings, which are connected to a load through the transmission system. This current, in turn, induces a reverse force (called "back emf") on the rotor winding. The back emf causes the rotor to slow down. As the rotor slows down, the governor (a system that monitors the generator's speed, and keeps it within a certain range) kicks in to speed the generator back up.
Why ca you not use a transformer on a DC circuit?
Transformer can not be connected to DC supply because of the reason described as below:In case of AC Supply to the transformer, Current flows through the primary winding when the primary winding is given V1 voltage. So the alternating flux is produced in the core. This flux links with the winding and the emf E1 is used in the winding, which lags V1 by 180 degree. So only magnetizing current is drawn from the supply ( at no load ), whose value is very less.Now if the primary winding is connected to the DC supply, unidirectional flux is produced in the core, which does not induce emf in the primary winding. So the current is limited by the resistance of the winding only. Now the resistance of the winding is very less so it takes large current. So the fuse blows off as soon as the DC supply is given. If the thick fuse wire is used, the primary winding burns out.
