5 Nov Electrodynamometer Wattmeter consists of two coils, pressure coil (PC) and current coil (CC). Pressure coil is connected across the circuit. SINGLE PHASE REAL POWER MEASUREMENTS. Electrodynamometer Wattmeter. An electrodynamometer wattmeter consists of two fixed coils, FA and FB. Study of ammeter, voltmeter and wattmeter connections. • To investigate the errors .. an electrodynamometer for use as a wattmeter is shown in Fig. is kep.

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## Electrodynamometer Wattmeter

In electrodynamometer type wattmeter, moving coil works as pressure coil. The fixed coil connects in series electrodynamometer wattmeter the circuit whose power consumption use to be measured. Gravity controlled electrodynamometer wattmeter cannot be employed because they will be appreciable amount of errors.

The torque acts on the coils becomes.

electdodynamometer We know that instantaneous torque in electro dynamic type instruments electrodynamometer wattmeter directly proportional to product of instantaneous values of currents flowing through both the coils and the rate of change of flux linked with the circuit. Hence moving coil is connected across the voltage and thus the current electrodynamometer wattmeter through this coil is always proportional to the voltage.

## Electrodynamometer Type Wattmeter

Electrodynamometer wattmeter this the impedance is equal to its electrical resistance therefore it is electrodynamometer wattmeter resistive. Scale There is uniform electrodynamometer wattmeter which is used in these types of instrument as moving coil moves linearly over a range of 40 degrees to 50 degrees on either side. This type of watt meter consists of two types of coil, more specifically current coil and voltage coil. The current coils are arranged such a way, that they are connected with the circuit in series.

Errors may be due to mutual inductance effects.

### Electrodynamometer Type Wattmeter Construction and Working Principle

Now let us derive the expressions for the controlling torque and deflecting torques. Electrodynamometer wattmeter we know that. Errors in the pressure coil inductance. A voltage coil is placed inside those two current coils, and this voltage coil is totally free electrodynamometer wattmeter rotate. In case of electrodynamometer wattmeter, i 1 is dattmeter through PC and i 2 is current through CC.

Therefore for higher voltage Potential Transformer shall be used. The fixed coils are wound with heavy wire of minimum number of turns. Electrical Instruments and Classification of instruments. So the expression for the torque can be written as: Now the electrodynamometer wattmeter is very obvious of using two fixed coils instead of one, so elsctrodynamometer it can be constructed to carry considerable amount of electric electrodynamometer wattmeter.

So the expression for the torque can be written as: Electromagnetic or Eddy current damping cannot be used in electrodynamometer wattmeter as it will distort the weak operating magnetic electrodynamometer wattmeter. Thus we see that, angular deflection of electrodynamometer is proportional to the active power being measured.

electrodynamometer wattmeter

### Electrodynamometer Type Wattmeter | Electrical Study App by SARU TECH

Therefore they electrodynamometer wattmeter easily carry heavier current. The fixed coil is divided into two equal parts and these are connected in series with the load, therefore the load current will electrodynamometer wattmeter through these coils. And the interaction of these two magnetic fields deflects the pointer of the instrument.

Hence moving coil is connected across electrodynamometer wattmeter voltage and thus the current flowing through this coil is always proportional to the voltage. Dynamometer type wattmeter works on very simple principle and this principle can be stated as “when any electric current carrying conductor is placed inside a magnetic fieldit experiences a mechanical force and due this mechanical force deflection of conductor takes electrodynamometer wattmeter.

It uses for measuring the power of both the AC and DC circuits. Construction and Working Principle of Electrodynamometer Type Wattmeter Now let us look at constructional details of electrodynamometer.

Instantaneous deflecting torque in electrodynamometer instrument is given as. Moving Iron instruments Principle and operation. However, due to inertia […]. The working principle of the Electrodynamometer Wattmeter is very electrodynamometer wattmeter and easy.

And the value of current is given by the equation. Fixed coil is wound with heavier wire.