The electrodynamometer type instrument is a transfer instrument. A transfer instrument is one which is calibrated with a d.c. source and used without any. An electrodynamic type instrument consists of Two Fixed Coil, flux is used in Electrodynamic or Electrodynamometer type instrument. This means that the torque in electrodynamometer instruments must have . Electrodynamometer type voltmeters are the most accurate type of.

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The instrument whose working depends leectrodynamometer the reaction between the magnetic field of moving and fixed coils is known as the Electrodynamo-meter Wattmeter. It uses for measuring the power of both the AC and DC circuits.

The working principle of the Electrodynamometer Wattmeter is very simple and easy. Their working depends on the theory that the current carrying conductor placed in a magnetic field experiences a mechanical force. This mechanical force deflects the pointer which is mounted on the calibrated scale.


Electrodynamometer Type Wattmeter

The Electrodynamometer Wattmeter has two types of coils; fixed and the moving coil. The fixed coil connects in series with the circuit whose power consumption use to be measured.

The supply voltage applies to the moving coil. The resistor controls the current across the moving coil, and it is connected in series with it. The pointer is fixed on the moving coil which is placed between the fixed coils. The current and voltage of the fixed and moving coil generate the two magnetic slectrodynamometer.

And the interaction of these two magnetic fields deflects the pointer of the instrument. The deflection of the pointer is directly proportional to the power flows through it.

The instantaneous torque acts on the pointer of the wattmeter and is given by the equation. The voltage across the pressure coil of the circuit is given as. If the pressure coil is purely resistive, then their current is in phase with the voltage. And the value of current is given by the equation. The value of the current in the pressure coil is very small.


Electrodynamic Type Instrument – Construction and Working Principle | Electrical Concepts

Hence the current flows through the pressure coil is considered as the total load current. The torque acts on the coils becomes. The average deflection torque is obtained by integrating the torque from 0 to T limit. The average deflection torque of the coil is given as.

Electrodynamometer type Instruments – Construction and Operation

The controlling torque exerted on the spring is given by. Please keep doing this. Your email address will not be published.

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