When the damage is discovered, make a written request for inspection by the carriers agent within. For power measurements involving large load currents, it is usually better to use a 5 a wattmeter in conjunction with a current transformer of suitable range. Electrodynamometer type, induction type, single phase and three phase wattmeter, compensation, energymeters. The two coils are connected in different circuits for measurement of power. Electrodynamometer types of instruments are used as a. So, we usually use this type of instrument as a standard instrument for calibrating other instruments. 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. Describe the principle of operation of the electrodynamic wattmeter.
Construction and working principle of electrodynamometer type wattmeter. There is a requirement of low power factor meter because, the usage of ordinary electrodynamometer. The working principle of the electrodynamometer wattmeter is very simple and easy. Dynamometer type wattmeter working your electrical guide. They are used as wattmeters, voltmeters and with some modification as power factor meters and frequency meters. To investigate the errors an electrodynamometer for use as a wattmeter is shown in fig. If two coils are connected such hence an electrodynamic instrument, when connected as shown in. While measuring power factor of a balanced load by 2 wattmeter method of 3. Electrodynamometer wattmeter pdf electrodynamometer wattmeter consists of two coils, pressure coil pc and current coil cc. Pressure coil is connected across the circuit whose power is to be measured and current coil is connected in series.
Electrodynamic wattmeter pdf the working principle of the electrodynamometer wattmeter is very simple disturbs the main magnetic field of the electrodynamic wattmeter. To change the order of your pdfs, drag and drop the files as you want. The working principle of the electrodynamometer wattmeter is very simple disturbs the main magnetic field of the electrodynamic wattmeter. They are used as wattmeters,varmeters and with some modification as power factor meters and frequency meters. Electrodynamometer wattmeter are often used for the measurement of power consumption. Type 2041 portable single phase low power factor wattmeter is a tautband suspension, electrodynamometer type wattmeter and is originally designed for. Electrodynamometer type, induction type, single phase and three. A carefully designed such an instrument can give a very accurate measurement. Electrodynamometer wattmeters these instruments are similar in design and construction to electrodynamometer type ammeters and voltmeters. For example, in using an electrodynamic wattmeter on direct current, two readings are taken, the direction of current flow through the instrument being reversed. This is a online courseware website for sns college students through this website student can access their materials. Electrodynamometer type wattmeter when a moving coil that is free to rotate is kept under the influence of a current carrying conductor, then automatically a mechanical force will be applied to the moving coil, and this force will make a little deflection of the moving coil.
Electrodynamic type instruments are similar to the pmmctype elements except that the an electrodynamometer for use as a wattmeter is shown in fig. The traditional analog wattmeter is an electrodynamic instrument. Electrostatic type wattmeter for small amount of a. These instruments are similar in design and construction to electrodynamometer type ammeters and voltmeters. Rf directional thruline wattmeter bird technologies. Dynamometer type wattmeter and its deflecting torque. Electrodynamometer wattmeter consists of two coils, pressure coil pc and current coil cc. The above circuit shows the circuit for an electrodynamometer wattmeter. Wattmeter design chapter 8 dc metering circuits pdf version. Lpf wattmeter pdf the instrument that measures the low value of power factor accurately is known as the low power factor wattmeter lpfw. Dynamometer type wattmeter electrical technology youtube.
The fixed coils of earlier wattmeters were designed to carry a current of 100 a but modem designs usually limit the maximum current ranges of wattmeters to about 20 a. Week 03 electrodynamometer as wattmeter ece2 3t 201415 free download as pdf file. The supply voltage is equal to the voltage across the pressure coil. Dynamometer type wattmeter electrical technology study buddy. It uses for measuring the power of both the ac and dc circuits. Dynamometer type instrument,electrical engineering. Pdf implementation of a digital wattmeter on fpga researchgate. Electrodynamometer wattmeter and low power factor lpf wattmeters are mostly similar in construction and operation, except for the following modifications are carried out in the electrodynamometer wattmeter to convert it into a lpf wattmeter. Study of ammeter, voltmeter and wattmeter connections. Pdf on oct 1, 2016, slami saadi and others published implementation of a digital. Dynamometer type wattmeter construction and working. Electrodynamometer type instruments download as powerpoint presentation.
This instrument can measure ac as well as dc quantities. What links here related changes upload file special pages permanent link page information wikidata item cite this page. Once you merge pdfs, you can send them directly to your email or download the file to our computer and view. A wattmeter, measures electric power of the given an electric apparatus or circuit. These instruments are similar in design and construction to electrodynamometer type ammeters and. To understand the basic construction of a dynamometer instrument.
Now the reason is very obvious of using two fixed coils instead of one, so that it can be constructed to carry considerable amount of electric current. Electrodynamometer instruments are widely used as an ammeter, voltmeter and wattmeter. Also, on analog wattmeters, the potential coil carries a needle that moves over a scale to indicate. Electrodynamometer type wattmeter construction and working. Electrodynamometer electrodynamics type instruments. It is intended for use on cw, am, fm, ssb, tv, and pulse signals only. Electrodynamometer wattmeters a media to get all datas. A transfer instrument is one which is calibrated with a d. The electrodynamometer type instrument is a transfer instrument. The fixed coils or field coils arc connected in series with the load and so carry the current in the circuit. Electrodynamometer type instruments pdf the electrodynamometer type instrument is a transfer instrument. We know that instantaneous torque in electrodynamic type instruments is directly. Pdf merge combine pdf files free tool to merge pdf online.
Electrodynamometer type wattmeter can measure ac and dc power with equal accuracy. Before we study the internal construction of electrodynamometer type wattmeter, it is essential to know the working principle of electrodynamometer type wattmeter. Hence moving coil is connected across the voltage and thus. In this post we will be discussing the torque equation in. In electrodynamometer type wattmeter, moving coil works as pressure coil. Bookmark file pdf electrodynamo type wattmeter electrodynamo type wattmeter following are the advantages of electrodynamometer type wattmeter and they are written as follows. Wvf file data conversion sample program optical interface driver. Thus circuit voltage is impressed across the pc and cc carries the circuit current. This document does not claim any originality and cannot be used as a substitute.
For example, in using an electrodynamic wattmeter on direct current, two readings are taken, the direction of. Merge pdf files combine pdfs in the order you want with the easiest pdf merger available. The instrument whose working depends on the reaction between the magnetic field of moving and fixed coils is known as the electrodynamometer wattmeter. A electrodynamometer wattmeter is used for the measurement for. Which type of damping is preferred in electrodynamometer type instruments. Rearrange individual pages or entire files in the desired order. The device consists of a pair of fixed coils, known as current coils, and a movable coil known as the potential coil the current coils are connected in series with the circuit, while the potential coil is connected in parallel.
Now let us look at constructional details of electrodynamometer. Moving coil moving coil moves the pointer with the help of spring control instrument. The model 4314b thruline wattmeter is an insertion type rf wattmeter designed to measure power flow and load match in 50 ohm coaxial transmission lines. Once files have been uploaded to our system, change the order of your pdf documents. Electrodynamometer type instruments construction and. There are two types of coils present in the electrodynamometer. If two coils are connected such that, current proportional to the load voltage, flows through one coil and current proportional to the load current, flows through another coil, the meter can be calibrated directly in watts. What links here related changes upload file special pages permanent link page. Week 03 electrodynamometer as wattmeter ece2 3t 201415.
They can be used for both to measure ac as well dc quantities as scale is calibrated for both. In these wattmeters, the field produced by the currentcarrying moving coil tries to come in line with the field produced by the currentcarrying fixed coil, and a deflecting torque is exerted on the moving system. Wattmeter design dc metering circuits electronics textbook. The wattmeter is an instrument for measuring the electric power in watts of any given circuit.