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In an Induction type meter, maximum torque is produced when the phase angle between two fluxes is
- a)0°
- b)45°
- c)60°
- d)90°
Correct answer is option 'D'. Can you explain this answer?
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Verified Answer
In an Induction type meter, maximum torque is produced when the phase ...
An induction type meter consists of two electromagnets, called shunt magnet and series magnet of laminated construction.
A coil having a large number of turns of fine wire is wound on the middle limb of shunt magnet. This coil is known as voltage coil or pressure coil and it is connected across the supply mains. It has many turns and is arranged to be as highly inductive as possible. This causes the current and therefore the flux, to lag the supply voltage by nearly 90°.
A coil having a large number of turns of fine wire is wound on the middle limb of shunt magnet. This coil is known as voltage coil or pressure coil and it is connected across the supply mains. It has many turns and is arranged to be as highly inductive as possible. This causes the current and therefore the flux, to lag the supply voltage by nearly 90°.
An adjustable copper shading rings are provided on the central limb of the shunt magnet to make the phase angle displacement between the magnetic field set up by shunt magnet and the supply voltage is approximately 90°.
The series electromagnet is energized by a coil which is known as current coil and it is connected in series with the load so that it carries the load current. The flux produced by this magnet proportional to and in phase with the load current.
The moving system essentially consists of a light rotating aluminium disk mounted on a vertical spindle or shaft. The fluxes produced by shunt and series magnet induce eddy currents in the aluminium disc. The interaction between these two magnetic fields and eddy currents set up a driving torque in the disc.
As in energy meter instrument, we have two fluxes and two eddy currents and therefore two torques are produced by
(i) First flux interacting with eddy current produced by second flux and
(ii) Second flux interacting with eddy currents generated by the first flux
Maximum torque is produced when the phase angle between these two fluxes is 90°
Most Upvoted Answer
In an Induction type meter, maximum torque is produced when the phase ...
The correct answer is:
a) 0
a) 0
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In an Induction type meter, maximum torque is produced when the phase angle between two fluxes isa)0°b)45°c)60°d)90°Correct answer is option 'D'. Can you explain this answer?
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