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The braking torque of induction type single-phase energy meter is:
- a)Directly proportional to the square of the flux
- b)Directly proportional to the flux
- c)Inversely proportional to the flux
- d)Inversely proportional to the square of the flux
Correct answer is option 'A'. Can you explain this answer?
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The braking torque of induction type single-phase energy meter is:a)Di...
Energy meter:
Energy meter or Watt-hour meter is used to measure the energy in kWh.
It is an integrating type instrument.
Its working principle is similar to the transformer.
There are three essential mechanisms required in the energy meter named Driving torque, Braking torque, and registered mechanism.
Driving torque:
This torque is required to revolve the disc or rotate the disc.
It is obtained by the electromagnetic induction effect.
Braking torque:
It is required to rotate the disc at a constant speed.
It is obtained by using a permanent magnet placed inside the energy meter near the Aluminum disc.
Eddy currents have induced in the magnet due to the movement of the rotating disc through the magnetic field. This eddy current reacts with the flux and exerts a braking torque which opposes the motion of the disk. The speed of the disk can be controlled by changing flux.
Breaking torque of induction type single-phase energy meter is:
K = constant
ϕ = flux
N = speed in rpm
R = radius of the disc
Re = resistance in path of current (i.e. disc)
The braking torque of induction type single-phase energy meter is directly proportional to the square of the flux.
Registered mechanism:
It registers the no. of rotations or revolutions of the disc which is proportional to the energy consumed in kWh.
Meter constant = (No. of revolutions / kWh)
Points to remember:
Creeping:
Sometimes the disc of the energy meter makes the slow but continuous rotation at no load i.e. when the potential coil is excited but with no current flowing in the load called creeping error
This error may be caused due to overcompensation for friction, excessive supply voltage, vibrations, stray magnetic fields, etc
It can be reduced by making two opposite holes on the disc.
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The braking torque of induction type single-phase energy meter is:a)Di...
Braking torque in an induction type single-phase energy meter is directly proportional to the square of the flux. This can be explained by considering the principles of operation of an induction type energy meter.
Principles of operation of an induction type energy meter:
1. Induction principle: The energy meter operates on the principle of electromagnetic induction. When an alternating current flows through the meter, it produces a rotating magnetic field.
2. Eddy current effect: The rotating magnetic field induces eddy currents in the conductive disc of the energy meter. These eddy currents create their own magnetic field, which interacts with the rotating magnetic field.
3. Torque generation: The interaction between the rotating magnetic field and the eddy currents in the disc generates a torque. This torque causes the disc to rotate, and the rotation is proportional to the energy consumption.
Explanation of the braking torque:
1. Flux linkage: The flux linkage in an induction type energy meter is directly proportional to the flux. Flux linkage refers to the product of the magnetic flux and the number of turns of the disc. It represents the amount of magnetic field passing through the disc.
2. Eddy current effect: The magnitude of the eddy currents induced in the disc is directly proportional to the flux linkage. A higher flux linkage leads to a stronger eddy current effect.
3. Braking torque: The braking torque is the counteracting torque that opposes the rotation of the disc. It is produced by the interaction between the rotating magnetic field and the eddy currents.
4. Proportional relationship: The braking torque is directly proportional to the square of the flux linkage. This means that as the flux linkage increases, the braking torque increases proportionally, and the disc rotation is slowed down.
In conclusion, the braking torque of an induction type single-phase energy meter is directly proportional to the square of the flux. This is because the magnitude of the eddy currents induced in the disc, which generate the braking torque, is directly proportional to the flux linkage.
Principles of operation of an induction type energy meter:
1. Induction principle: The energy meter operates on the principle of electromagnetic induction. When an alternating current flows through the meter, it produces a rotating magnetic field.
2. Eddy current effect: The rotating magnetic field induces eddy currents in the conductive disc of the energy meter. These eddy currents create their own magnetic field, which interacts with the rotating magnetic field.
3. Torque generation: The interaction between the rotating magnetic field and the eddy currents in the disc generates a torque. This torque causes the disc to rotate, and the rotation is proportional to the energy consumption.
Explanation of the braking torque:
1. Flux linkage: The flux linkage in an induction type energy meter is directly proportional to the flux. Flux linkage refers to the product of the magnetic flux and the number of turns of the disc. It represents the amount of magnetic field passing through the disc.
2. Eddy current effect: The magnitude of the eddy currents induced in the disc is directly proportional to the flux linkage. A higher flux linkage leads to a stronger eddy current effect.
3. Braking torque: The braking torque is the counteracting torque that opposes the rotation of the disc. It is produced by the interaction between the rotating magnetic field and the eddy currents.
4. Proportional relationship: The braking torque is directly proportional to the square of the flux linkage. This means that as the flux linkage increases, the braking torque increases proportionally, and the disc rotation is slowed down.
In conclusion, the braking torque of an induction type single-phase energy meter is directly proportional to the square of the flux. This is because the magnitude of the eddy currents induced in the disc, which generate the braking torque, is directly proportional to the flux linkage.
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The braking torque of induction type single-phase energy meter is:a)Directly proportional to the square of the fluxb)Directly proportional to the fluxc)Inversely proportional to the fluxd)Inversely proportional to the square of the fluxCorrect answer is option 'A'. Can you explain this answer?
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