The page covers the basic working principle and constructional features of dynamometer type wattmeter. Wattmeter definition of wattmeter by merriamwebster. End applications like commercial, industrial and domestic purpose. Working principle of voltmeter and types of voltmeter. This lets you remove the line section from the wattmeter housing for custom installation an d still make measurements.
These instruments are similar in design and construction to electrodynamometer type ammeters and voltmeters. Dynamometer type wattmeter construction and working principle. The dynamometer wattmeter works on the motor principle. The rf line section is precision machined to provide the best possible impedance match to the transmission line under test. Their working depends on the theory that the current carrying conductor placed in a magnetic field experiences a mechanical force. As shown in figure 318, it consists of a pair of fixed coils, known as current coils, and a moving coil, called the voltage potential coil.
The wattmeter is an instrument for measuring the electric power or the supply rate of electrical energy in watts of any given circuit. Safety symbols this symbol appears on the equipment indicating there is important information in the instruction manual regarding that particular area. For example, in using an electrodynamic wattmeter on direct current, two readings are taken, the direction of. It uses for measuring the power of both the ac and dc circuits. In this work, we present a design of a digital wattmeter pattern, implemented on a. It simultaneously measures the voltage and current values and. So it is a measuring instrument which measures the potential difference between the two points working principle of voltmeter. The fixed coils or field coils are connected in series with the load and so carry the. Also, on analog wattmeters, the potential coil carries a needle that moves over a scale to indicate. 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. Nov 03, 2019 the working principle of the electrodynamometer wattmeter is very simple disturbs the main magnetic field of the electrodynamic wattmeter. The electricity supply connection may be either single phase or three.
Electrodynamic wattmeters are a design that goes back to the early 20th century. A simple wattmeter method of measuring power involves two corrections. Thruline 4304a measuring instruments pdf manual download. When plugin element is removed from the rf line socket, the line section center conductor is exposed. Therefore this fixed coil is often called current coil or simply cc. Dynamometer type wattmeter working your electrical guide. Pdf on oct 1, 2016, slami saadi and others published. Given the two wattmeter readings from the twowattmeter method used on a threephase balanced load, it is possible to find the tangent of the phase impedance angle as times the ratio of the difference between the two wattmeter readings and their sum, based on equation 4. When working with rf powers of 200 watts or more, the potential of the center conductor of the line section will be over 100 volts. Simultaneously, watt readings using a standard commercially available analogue wattmeter were also taken. Construction and working principle advantages errors. As shown in the above figure, the wattmeter has two sets of coils. A wattmeter does a complex job, measuring the power flowing through an electrical circuit. Classification, absolute and secondary instruments, indicating instruments.
As evident from the name, a wattmeter is used for measuring the total power across any circuit. Energy meter or watthour meter is an electrical instrument that measures the amount of electrical energy used by the consumers. We have used several lamps having watt ratings of 40, 60 and 100watt as loads and measured real power dissipated at those loads using our designed digital wattmeter. Measurement of threephase power with the 2wattmeter. Pdf implementation of a digital wattmeter on fpga researchgate. Dynamometer type wattmeter and its deflecting torque about. Before we study the internal construction of electrodynamometer wattmeter, it very essential to know the principle of working of electrodynamometer type. A wattmeter is a tool used to measure the amount of electricity being used. Digital wattmeter with ad8307, pic16f876, lcd display. Now let us look at constructional details of electrodynamometer type wattmeter. We will discuss electrodynamometer type wattmeter working principle and its construction.
Dynamometer type wattmeter construction and working. 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. 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. Feb 20, 2018 in this video you will learn about how a wattmeter workand its construction. Technical aspects like single phases, three phases, high tension ht, low tension lt and accuracy class materials. Do not put fingers or other objects into the plugin element socket while rf power is applied. 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. Electrodynamometer wattmeter are often used for the measurement of power consumption. Do not touch the center conductor while rf power is on. 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. Wattmeter electric power is measured by means of a wattmeter.
Parallel connection is used because a voltmeter is constructed in such a way that it has a very high value of resistance. Due to this the sizes of earlier wattmeter were large. Hall effect multiplier construction, working principle. Electrodynamometer type wattmeter construction and working. For line to line voltages of 415v, phase current of 5a, phase angles of 80 capacitive. Theory of operation describes how the 43 wattmeter works and installation describes how to set up and prepare the 43 wattmeter for use. This mechanical force deflects the pointer which is mounted on the calibrated scale. At zero power factor, corresponding to a purely reactive load, both wattmeters will again have the same wattage indication but with the opposite signs, so that their algebraic sum will yield zero power absorbed, as it should. The traditional form of wattmeter is called as dynamometer wattmeter. Utilities are one of the electrical departments, which install these instruments at every place like homes, industries, organizations, commercial buildings to charge for the electricity consumption by loads such as lights, fans, refrigerator, and other home appliances.
Construction and working principle of electrodynamometer type wattmeter. 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. The threewire, threewattmeter connection has the advantages of indicating the power in each individual phase not possible in the twowattmeter connection and phase to neutral voltages. The three main types are electrodynamic, electronic and digital. The two coils are connected in different circuits for measurement of power. The fixed coils or field coils arc connected in series with the load and so carry the current in the circuit. Oct 22, 2019 the page covers the basic working principle and constructional features of dynamometer type wattmeter. It also shows the derivation for deflecting torque.
Jun 15, 2018 working principle of voltmeter the main principle of voltmeter is that it must be connected in parallel in which we want to measure the voltage. The transition from a negative to a positive value occurs. The wattmeter measures the electricity used in terms of the number of watts used. Electromagnetic wattmeters are used for measurement of utility frequency and audio frequency power. The main cpu board is mounted directly on the display. Now let us see the construction and working of hall effect multiplier. Nov 29, 2014 the traditional form of wattmeter is called as dynamometer wattmeter. On this page you can read or download disadvantages of a wattmeter in pdf format. The wattmeter software source code files can be downloaded from the free downloads section of the elektor electronics website.
Types of energy meters and their working principles elprocus. Bird model 43 wattmeter ii safety symbols this symbol appears on the equipment indicating there is important information in the instruction manual regarding that particular area. Electrodynamometer type wattmeter working principle. The input board is a small pcb mounted directly on the connector. The current coils are connected in series with the circuit, while the potential coil is connected in parallel. Wattmeter definition is an instrument for measuring electric power in watts. The threewire, three wattmeter connection has the advantages of indicating the power in each individual phase not possible in the two wattmeter connection and phase to neutral voltages. The traditional analog wattmeter is an electrodynamic instrument. The current and voltage of the fixed and moving coil generate the two magnetic fields.
Design and hardware implementation of a digital wattmeter. A wattmeter is an instrument used to measure electrical power consumed i. Measurement of threephase power with the 2wattmeter method. Number of wattmeters required in a singlephase system there are just two wires.
Bird model 43 wattmeter 2 a shielded cable connects the rf line section to the rest of the wattmeter. Electrodynamometer type, induction type, single phase and three phase wattmeter. This device is available in a purely electronic form too which is known as digital wattmeter. Apr 26, 2019 electrodynamometer wattmeter are often used for the measurement of power consumption. For example, in using an electrodynamic wattmeter on direct current, two readings are taken, the direction of current flow through the instrument being reversed. The main principle of voltmeter is that it must be connected in parallel in which we want to measure the voltage. Power factor meter working principle the basic working principle of power factor meter is similar to that of dynamometer type wattmeter i. It is also used in the resistive circuit which has a power factor range from 0. It consists of following parts there are two types of coils present in the electrodynamometer. Bird model 43 wattmeter ii resuscitation personnel working with or near high voltages should be. Do not open the instrument safety symbols warning notes call attention to a procedure, which if. Dynamometer type wattmeter and its deflecting torque.
Dec 21, 2019 the working principle of the electrodynamometer wattmeter is very simple and easy. Introduction describes the features of the 43 wattmeter, lists equipment supplied and optional equipment, and provides powerup instructions. In this post we are going to understand how wattmeter works. Do not open the instrument safety symbols warning notes call attention to a procedure, which if not correctly performed, could result in personal injury. Caution for low reflection measurements, do not rotate the reflected power element to read forward power. The fixed coils or field coils are connected in series with the load and so carry.
First, for the power expended upon the fixed coil of the wattmeter. Digital wattmeter english mainpage vis dansk oversat side new software available 28 okt 2008. Moving coil moves the pointer with the help of spring control instrument. Dynamometer wattmeter working principle,construction. Their working depends on the theory that the current carrying conductor. When a current carrying conductor is placed in a magnetic field, a transverse effect is noted. Types of energy meters and their working principles. Rf directional thruline wattmeter model 43 repeater builder. Hall effect multiplier is also used where the multiplication of signals over a wide range of amplitudes is performed. Given the two wattmeter readings from the two wattmeter method used on a threephase balanced load, it is possible to find the tangent of the phase impedance angle as times the ratio of the difference between the two wattmeter readings and their sum, based on equation 4. It simultaneously measures the voltage and current values and multiplies them to give power in watts. Utilities are one of the electrical departments, which install these instruments at every place like homes.
This type of watt meter consists of two types of coil, more specifically current coil and voltage coil. View and download bird thruline 4304a operation manual online. Bird model 43 wattmeter personnel working with or near high voltages should be familiar with modern methods of resuscitation. The instrument that measures the low value of power factor accurately is known as the low power factor wattmeter lpfw. The working principle of the electrodynamometer wattmeter is very simple disturbs the main magnetic field of the electrodynamic wattmeter. Be sure transmission line is terminated into a load or antenna. Jun 08, 2019 before we study the internal construction of electrodynamometer type wattmeter, it is essential to know the working principle of electrodynamometer type wattmeter 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. The instrument whose working depends on the reaction between the magnetic field of moving and fixed coils is known as the electrodynamo meter wattmeter. The low power factor meter is used for measuring the power of the highly inductive circuit. Personnel working with or near high voltages should be familiar with modern methods of resuscitation. Chapter 4 operating instructions warning when working with rf powers of 200 watts or more, the potential of the center conductor of the line section will exceed 100 volts.
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