Advance researches on energy meter develop many new and cost efficient technologies to construct energy meter that help at the same time to improve the billing system as well as the payment system. The working principle of the electrodynamometer wattmeter is very simple and easy. Maybe you are happy with his answer about the meter test and maybe you are not. The two stationary coils, s and s 1, are connected in series in phase b. Wattmeter, energy meter, electrostatic instruments, rectifier type instruments, extension of ranges of voltmeters and ammeters.
Electrodynamometer type wattmeter in general, a watt meter is used to measure the electric power of a circuit, or sometime it also measures the rate of energy transferred from one circuit to another circuit. If you are already aware of constructional feature then you may proceed. These coils are called the current coils of electrodynamometer type wattmeter. Electrodynamometer types of instruments are used as a. Thus, the power factor of the wattmeter becomes lagging, and the meter reads high reading. In electrodynamometer type power factor meter there are further two types on the basis of supply voltage 1 single phase 2 three phase. Electrodynamometer by muhammad nur zakwan zainal on prezi. Power factor meters electrodynamometer type power factor meter. If you are in need of highquality used and refurbished power factor meters, come to valuetronics.
This is the case, for example, with voltohmmilliam meters mounted on newdesign interiorcommunication switchboards. Working power the true or real power used in all electrical appliances to perform the work of heating, lighting, motion, etc. It is recommended to read before going to understand the torque equation. The watt meter hour is the example of the integrating circuit.
Electrodynamometer article about electrodynamometer by. Hi friends, in this article, i am discussing the dynamometer type wattmeter working principle and related information, if you are interested in it then you at the right place these are basically moving coil instruments. Other meter movements the darsonval meter movement permanent. Electrometer, instrument designed to measure very small voltages and currents. Multiplying factor of electrodynamometer type wattmeter. Power factor measurement provides us the knowledge of type of loads that we are using and helps in calculation of losses happening during the power transmission system and distribution. Pressure coil a has a noninductive resistance r connected in series with it, and coil b has a highly inductive choke coil l connected in series with it. Pressure coil capacitance the pressure coil has capacitances along with the inductance. Principle of magnetic flow meter based on faradays law.
Electrodynamometer definition of electrodynamometer by. Earlier these fixed coils are designed to carry the current of about 100 amperes but now the modern wattmeter are designed to carry current of about 20 amperes in order to save power. Apr 24, 2018 torque equation in electrodynamometer instruments. As the name suggests the low power factor meter are the instruments that measures lower values of power factor accurately. Dynamometer type wattmeter working your electrical guide.
A dynamo meter type watt meter is used in various applications where the power or energy transfer has to be measured. The two coils are connected in different circuits for measurement of power. Hence an electrodynamic instrument, when connected as shown in fig. Electrodynamometer article about electrodynamometer by the. The small shield with significantly thinner walls can be set into the electricity meter to achieve the same result. Learn a little about induction motors in the process. Magnetic flow meters works based on faradays law of electromagnetic induction. The basic principle was laid out in an 1848 paper by wilhelm weber 18041891. This type of meter directly measures the energy in watt hour. The quadrant, lindermann, hoffman, and wulf electrometers measure electrical potential between charged elements e. Electrodynamometer type wattmeter construction and working.
It uses for measuring the power of both the ac and dc circuits. The meter tech watches the disk of the watthour meter spin or watches the display on the meter during the meter test and in about 2 minutes they tell you that the meter is just fine and that it tested somewhere close to 100. Electrodynamometertype meters the electrodynamometertype meter differs from the galvanometer types we have just studied in that two fixed coils are used to produce the magnetic field instead of a permanent magnet. May 15, 2018 in power transmission system and distribution system we measure power factor at every station and electrical substation using these power factor meters. This capacitance increases the power factor of the instrument. These are electromagnetic, electronic and smart meters. Dynamometer type wattmeter working principle electrodynamometer.
Electrodynamometer introduction it have nonuniform scale it is sensitive to overloads and any mechanical impacts. For sinusoidal alternating quantities the average power is vi cos. Two identical pressure coils a and b pivoted on a spindle constitute the moving system. If a residential meter does measure apparent power, will a housewide pf correction device i.
However, it is much more convenient to have an instrument that indicates power directly. Electrodynamometer type instruments construction and. Aug 14, 2016 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. An electrodynamic instrument connected as a wattmeter, with the main current flowing through the fixed coil, and a small current proportional to the voltage flowing through the movable coil. Power factor is a measure of how effectively you are using electricity. Electrodynamometer electrodynamics type instruments. Construction and working principle of electrodynamometer type wattmeter. This app covers entire aspects of the subject, from basic engineering to advanced and modern topics related to electrical engineering and technology. Electrodynamometer type meters the electrodynamometer type meter differs from the galvanometer types we have just studied in that two fixed coils are used to produce the magnetic field instead of a permanent magnet. Physical construction of dynamometer same as the fixed coil unless the facts that is will rotating during the flowing of the current that flow inside it.
Rf power meters radio frequency rf power meters are the electronic test equipment of choice to collect information, analyze rf power, and display information in an easytoread digital format. This type of meter directly measures the energy in. A dynamometer type power factor meter consists of two fixed coils ff connected in series carrying the load current or a definite fraction of it forming the current circuit, and two identical moving coils a and b fixed at the nearly right angle to each other pivoted on the same spindle forming the pressure circuit as shown in the figure. Dynamometer wattmeter electrical engineering assignment. For supplies with a current load up to 100 amps you can connect the cable directly into the meter, this is called a direct current or direct wire three phase meter. An electrodynamometer is an instrument used for measuring the electric power. Other features such as degree of enclosure, nature of mounting arrangements, sizes, ranges, grades, shock resistance and type of external power supply. Electromagnetic flow meters, simply known as mag flow meter is a volumetric flow meter which is ideally used for waste water applications and other applications that experience low pressure drop and with appropriate liquid conductivity required the device doesnt have any moving parts and cannot work with hydrocarbons and distilled water. The power factor meter determines the types of load using on the line, and it also calculates the losses occur on it. The fixed coils or field coils arc connected in series with the load and so carry the current in the circuit. It is necessary to protect only some weak places of the electricity meter. It is independent of the rate at which the total energy consumed. Single phase electrodynamometer power factor meter. Driscoll, measurement of current with a pellattype electrodynamometer, j res.
Electrodynamic wattmeter article about electrodynamic. They are used as wattmeters,varmeters and with some modification as power factor meters and frequency meters. Power wire kit digital multimeter appa 95 if possible wattmeter power strip suicide cord singlephase induction motor 3phase induction motor. An instrument which measures electrical energy in watt hours is essentially a wattmeter which accumulates or averages readings. Various types of flow meters and flow sensors are available, and only by selecting the appropriate device according to the targeted fluid and purpose will the required results be obtainable. In this paper, a new concept on energy meter has been explained using power factor meter and instrument transformer using embedded technology. Electrodynamometer wattmeters these instruments are similar in design and construction to electrodynamometer type ammeters and voltmeters. There is a requirement of low power factor meter because, the usage of ordinary electrodynamometer wattmeter to measure power factor of a low pf load gives inaccurate results. The fixed coils, therefore, form the current coil or simply c.
The power factor is the cosine of the angle between the voltage and current. Electrodynamometer definition is an ammeter or galvanometer in which the torque due to the reaction between two coils in series with each other is balanced by a spiral spring. Electrodynamometer instruments or electrodynamic instruments have fixed coil divided into two sections and a moving coil. Two movable coils are also used in the electrodynamometer meter.
But in these instruments, the operating field is produced by the fixed coil instead of a permanent magnet. The integrating instrument measures the total energy supplied by the circuit in a given interval of time. Mar 12, 2015 for ies student specially for hindi medium student. Engineers use power factor meters to log the power meter in transmission and distribution systems accurately. This page introduces the process for selecting a flow meter or flow sensor. All content on this website, including dictionary, thesaurus, literature, geography, and other reference data is for informational purposes only. Understanding the power factor laurens electric cooperative. Apr 19, 2018 for the love of physics walter lewin may 16, 2011 duration. Equipment and materials to be checked out from stockroom. L3electrodynamics indicators elapsed time meters status indicators developing and manufacturing high quality electronic systems and electromechanical and electromagnetic components since 1964, l3 communications electrodynamics l3edi continues to provide products and solutions for the military and aerospace markets. Engineers use rf power meters to measure and document pulsed. Apr 26, 2018 as the name suggests the low power factor meter are the instruments that measures lower values of power factor accurately. Before we study the internal construction of electrodynamometer type wattmeter, it is essential to know the working principle of electrodynamometer type wattmeter.
They are used as wattmeters, voltmeters and with some modification as power factor meters and frequency meters. 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 scale is marked with the effective value, even though it is the average value to which the meter is reacting. Now there are two types of power factor meters 1 electrodynamometer type and 2 moving iron type. For the love of physics walter lewin may 16, 2011 duration. Nov 30, 2015 multiplying factor of electrodynamo meter type watt meter. Difference between electrodynamometer wattmeter and low. Magnets the most modern methods of stopping electricity. Coils m and m 1 are mounted on a common shaft, which is free to move without restraint or control springs. The power factor multiplier is the adjustment factor used in determining the customers share of the financial burden that he or she has caused for the billing month. All articles of this app are totally based on practical experiences as well as a strong base of theoretical knowledge and is written in very simple and.
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. Apr 22, 2016 an electricity meter is a device which measures the total electrical energy or electricity consumed by the appliances which draw electrical energy from the main power supply at a house or an official space and so on. Power factor meters electrodynamometer type power factor. Symbol of power meter the traditional analog wattmeter is an electrodynamics instrument. Various types of power are at work to provide us with electrical energy. The method of connection of this type of power factor meter, in a 3 f circuit, is shown in figure 14. Now let us look at constructional details of electrodynamometer type wattmeter. An electricity meter is a device which measures the total electrical energy or electricity consumed by the appliances which draw electrical energy from the main power supply at a house or an official space and so on. Difference between electrodynamometer wattmeter and low power. Digital electronic instruments measure many parameters and can be used where a wattmeter is needed. This is a online courseware website for sns college students through this website student can access their materials. The watt hour meter is the example of integrating instruments. This type of meter is commonly found in industrial or commercial premises and used to power large motors and other heavy loads.
That is why an ac meter will give an incorrect reading if used to measure dc. Smart energy meter using power factor meter and instrument. This electronic test equipment is ideal when you need to measure, document, and collect information regarding the power factor of a device. 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. This method is used by developers of meters, and with the right design meters are well protected from strong permanent magnets.
Electrodynamometer definition of electrodynamometer by the. In power transmission system and distribution system we measure power factor at every station and electrical substation using these power factor meters. The general circuit diagram of single phase electrodynamometer power factor meter is given below. The motor used for this purpose is called a wattmeter, and the instrument that can be applied as a wattmeter is known as a dynamometer, or sometimes as an electrodynamic instrument. What is the difference between electrodynamometer wattmeter. Dynamometer type wattmeter working principle 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.
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