and can moves freely. • In electrodynamometer type wattmeter, moving coil works as pressure coil. • Hence moving coil is connected across the voltage and thus. Study of ammeter, voltmeter and wattmeter connections. • To investigate the errors .. an electrodynamometer for use as a wattmeter is shown in Fig. is kep. 5 Nov Electrodynamometer Wattmeter consists of two coils, pressure coil (PC) and current coil (CC). Pressure coil is connected across the circuit.

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Transfer chute design using rocky software Posted 10 days ago. The current and voltage of the fixed and moving coil generate the two magnetic fields.

Fixed Coil The fixed coil is divided into two equal parts and these are connected in series with the load, therefore the load current will flow through these coils. Stay ahead in your courses Sign UP now. electrodynamometed

Electrodynamometer Type Wattmeter

Notify me when new comments are added. It is divided into two halves.

Construction and Working Principle of Electrodynamometer Type Wattmeter Now let us look at constructional details of electrodynamometer. This site uses Akismet to reduce spam. Gravity controlled system cannot be employed because there will be appreciable amount of errors.

A “MEDIA TO GET” ALL DATAS IN ELECTRICAL SCIENCE!!: Electrodynamometer Wattmeters

Circuit Globe All wsttmeter Electrical and Electronics. The scale of the instrument can be calibrated to indicate watts, and thus it becomes a dynamometer wattmeter. Therefore controlling torque Tc is given as. Therefore this fixed coil is often called Current Coil or simply CC.

The dynamometer instrument can also be employed as a voltmeter or ammeter. Therefore the current flowing through the PC is in phase with the electrodynamkmeter voltage V and given as. It uses for measuring the power of both the AC and DC circuits. Wattjeter me when new comments are added. It consists of following parts There are two types of coils present in the electrodynamometer.


The deflection of the pointer is directly proportional to the power flows through it. Moving coil is connected across the supply voltage. For the control of movement spring is used. Instantaneous deflecting torque in electrodynamometer instrument is given as. Where, x is the angle.

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Hence the instantaneous value of torque can be written as Average value of deflecting torque can be obtained by integrating the instantaneous torque from limit 0 to T, where T is the time period of the cycle. Fixed electtrodynamometer is chosen as a current coil as it can be made more massive.

The pressure coil current wzttmeter a low pf wattmeter may be as much as 10 times the value used for ordinary wattmeters.

Dynamometer Type Wattmeter Working Principle | Electrodynamometer | Electrical A2Z

Ask a Question Submit Now. Errors may be due connections. Electrodynamometer Wattmeter are often used for the elecyrodynamometer of power consumption. Hence moving coil is connected across the voltage and thus the electric current flowing through this coil is always proportional to the voltage.

Leave a Reply Cancel reply Your email address will not be published. Control System Out of two controlling systems i. Electromagnetic or Eddy aattmeter damping cannot be used in electrodynamometer wattmeter as it will distort the weak operating magnetic flux. If there is phase difference between voltage and electric current, then expression for instantaneous current through current coil can be written as As current through the pressure coil is very very small compared to the current through current coil hence current through the current coil can be considered as equal to total load current.


Following are the errors in the electrodynamometer type wattmeters: Posted 2 days ago. Errors in Electrodynamometer Type Wattmeter Following are the errors in the electrodynamometer type wattmeters: Because the meter deflection is proportional to the field coil current and to the moving-coil current.

Pressure coil is connected electrodynammoeter the circuit whose power is to be measured and current coil is connected in series. Before we study the internal construction of electrodynamometer wattmeterit very essential to know the principle of working of electrodynamometer type wattmeter. One coil is fixed and another coil is moving.

Electrodynamometer Wattmeter

An electrodynamometer wattmeter have two types of coils. Get homework help anytime, anywhere! Fixed coil or CC is carries the circuit current.

Consequently, current I v through the moving coil is directly proportional to the load voltage. So the expression for the torque can be written as: Therefore, for higher voltages, PC is designed for V.

Therefore they can easily carry heavier current. The supply voltage applies to the moving coil. Learn how your comment data is processed.

In order to derive these expressions let us consider the circuit diagram given below: Power is measured by means of an electrodynamometer instrument that has similarities to a PMMC instrument. Your email address will not be published. Basic construction of a dynamometer instrument.