It should be noted that both fixed and moving coils are air-cored. are proportional to the total ENERGY, or watt-hours, consumed during that Instantaneous value of voltage across PC = 2VSinwt, As a high value of series resistance is connected in series with the PC, therefore PC circuit can be assumed purely resistive. Hence metal parts should be kept as minimum as possible. pointer depends upon the power factor of the circuit as well as upon the voltage and A complete revolution Figure 1-45 shows the proper way This means that the torque in electrodynamometer instruments must have a finite value and unidirectional for AC and DC quantity unlike PMMC instruments . WATTMETER . Construction of Electrodynamometer Instruments, Torque Equation of Electrodynamometer-type Instruments, Advantages of Electrodynamometer-type Instruments, Disadvantages of Electrodynamometer-type Instruments, Comparison of Various Types of Instruments, Moving Iron Instruments - Attraction and Repulsion Type, Damping Systems - Air friction, Fluid Friction & Eddy Current Damping, Facts Everyone Should Know About Trailer Wires, 2 Important Distribution Transformer Testing Methods. 1-46) registers 1 kilowatt-hour, or 1,000 Dynamometer type wattmeter works on very simple principle and this principle can be stated as when any current carrying conductor is placed inside a magnetic field, it experiences a mechanical force and due to this mechanical force deflection of conductor takes place. How to Test Percentage Impedance of Transformer? Thus we see that, angular deflection of electrodynamometer is proportional to the active power being measured. The electrodynamometer is a transfer-type instrument. safe rating is generally given on the face of the instrument. Now let’s discuss why PMMC Instruments cannot be used for AC Measurements. A complete revolution of the hand on this dial will move the hand of the second dial as purely resistive as possible. Q.60 Why would you use a hook-on voltameter instead of a multimeter? The schematic diagram of the electrodynamic instrument and a practical meter is shown. //--> Accordingly, you must read the hands from left to right, and add three zeros to the This principle is used in the electrodynamometer type instrument. Thus mmf = NI hence current through moving coil should be high or the number of turns should be large. This makes the system heavy reducing torque to weight ratio. Thus, the instantaneous value of the deflecting torque is proportional to the instantaneous power. However, for an ordinary meter, the inertia is so great that on power frequencies the pointer does not go very far in either direction but merely stays (vibrates slightly) around zero. coil. The actuating force of a wattmeter comes from the field of its current coil and the conducting material to completely remove the electrostatic effects. Therefore controlling torque Tc = kθ where k = spring constant (N-m/rad). For DC use, the deflection is thus proportional to the square of the current and hence the scale non-uniform and crowded at the ends. It uses for measuring the power of both the AC and DC circuits. These vanes move in sector-shaped chambers. The electrodynamic or dynamometer-type instrument is a moving-coil instrument but the magnetic field, in which the coil moves, is provided by two fixed coils rather than by permanent magnets (eg: PMMC instruments). Laboratory standard instruments are usually contained in highly polished wooden cases. Commentdocument.getElementById("comment").setAttribute( "id", "aa93a955da3171d45585bfb48484d491" );document.getElementById("dfed9c1d96").setAttribute( "id", "comment" ); Subscribe to our mailing list and get interesting stuff and updates to your email inbox. But the moving system due to its inertia cannot follow such rapid variations in the instantaneous torque and responds only to the average torque. Light but rigid construction is used for the moving coil. Working Principle of Electrodynamometer Instruments. The average deflecting torque over a complete cycle is given by: where T is the time period for one complete cycle. The moving system also carries the counterweights and truss type pointer. In the wattmeter, both the current and These vanes move in a sector-shaped chamber. to connect a wattmeter in various circuits. Thus, the instrument indicates the power. The potential coil consists of many turns potential circuits may be carrying such an overload that their insulation is burning, and Let the rms voltage of circuit is V and current flowing is I.
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