Power factor meters electrodynamometer type power factor meter. However, it is much more convenient to have an instrument that indicates power directly. Construction a dynamometer type power factor meter consists of two fixed coils ff. Electrodynamometer definition of electrodynamometer by the. 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. Hpcl instruments placement question paper sample model paper 2020. This video has described the construction and working of dynamometer type power factor meter. Earlier these fixed coils are designed to carry the electric current of about 100 amperes but now the modern wattmeter are designed to carry electric current of about 20 amperes in order to save power. What is the difference between electrodynamometer wattmeter. Electrodynamic power factor meter single phase and three. Two identical pressure coils a and b pivoted on a spindle constitute the moving system.
Electrodynamometer wattmeters a media to get all datas in. Electrodynamic electrodynamometer type power factor meters are used to. The moving coil and pointer, which are attached to the coil, are suspended between and connected in series with the two field coils. Apr 19, 2018 for the love of physics walter lewin may 16, 2011 duration. Difference between electrodynamometer wattmeter and low.
An electrodynamometer is an instrument used for measuring the electric power. 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. Understanding the power factor laurens electric cooperative. 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. Electrodynamometer, imperial units labvolt series by festo. The electrodynamometer is electrically powered from standard fixed ac line supply. An ohm meter, or a series of lights, can be used to detect the insulation strength of an ungrounded distribution system. Power factor is a measure of how effectively you are using electricity. A wattmeter, measures electric power of the given an electric apparatus or circuit. Hpcl instruments placement question paper sample model.
Electromagnetic wattmeters are used for measurement of utility frequency and audio frequency power. Dynamometer type wattmeter working your electrical guide. The fixed coil is splitted into two equal parts, which are placed parallel to each other. The general circuit diagram of single phase electrodynamometer power factor meter is given below. To measure the torque, this lever can be pushed to adjust and read the torque. Power factor meter incorporates two pressure coils one with noninductive. They are used as watt meters,varmeters and with some modification as power factor meters and frequency meters. Electrodynamometer article about electrodynamometer by the. It uses for measuring the power of both the ac and dc circuits. Electrodynamometer wattmeters a media to get all datas. Wind power plants with dfig interactive lab assistant. Single phase electrodynamometer type wattmeter the instrument used to measure active power p drawn by a load or circuit is called wattmeter. This is a online courseware website for sns college students through this website student can access their materials.
Induction type wattmeter, watthour meter, and dynamometer type power factor meter. This type of instrument can be used either as an ammeter or as a voltmeter, but is generally used as a wattmeter. Electronic measurement power factor meter slideshare. For the love of physics walter lewin may 16, 2011 duration. As the battery of the meter ages, its output voltage gradually decreases. The fixed coils or field coils are connected in series with the load and so carry the. This purpose is served by connecting a dynamometer type power factor meter in the circuit. Nov 30, 2015 single phase electrodynamometer type wattmeter the instrument used to measure active power p drawn by a load or circuit is called wattmeter. Instead, the meter will vibrate at or near the zero reading. If you apply alternating current to the standard galvanometertype meter, it will not produce a usable reading. It indicates the power factor of the circuit directly on the scale by the. Single phase electrodynamometer power factor meter scribd. The two fixed coils are aircored to avoid hysteresis effects when used on ac.
Mecog portable type instruments are electrodynamometer type instrument. Analog electrodynamometer portable type watt var power. Electrodynamometer type wattmeter working principle. The basic principle was laid out in an 1848 paper by wilhelm weber 18041891. Electrodynamometer electrodynamics type instruments. This coil is split up into two parts and carries the current of the circuit under. Electrodynamometer types of instruments are used as a. Dynamometer type wattmeter working principle electrodynamometer. Various types of power are at work to provide us with electrical energy. Electrodynamometer wattmeter consists of two coils, pressure coil pc and current coil cc. Definition of electrodynamometer in the dictionary. Electrodynamometer type instruments alternating current. Powerfactor meter article about powerfactor meter by the.
Single phase electrodynamometer power factor meter. The current i1 and i2 are not determined by the phase splitting circuit. Working power the true or real power used in all electrical appliances to perform the work of heating, lighting, motion, etc. Apr 08, 2018 electrodynamometer wattmeter consists of two coils, pressure coil pc and current coil cc. Hpcl instruments placement question paper sample model paper 1 instrument is a device for determining a the magnitude of a quantity b the physics of a variable c either of the above d both a and b 2 electronic instruments are preferred because they have a no. The answer is that a power factor is a unit of measurement of various electric drives like. These coils are called the electric current coils of electrodynamometer type wattmeter. The fixed coils or field coils arc connected in series with the load and so carry the current in the circuit. In electrodynamometer type power factor meter there are further two types on the basis of supply voltage 1 single phase 2 three phase. T1t2r1r2no of hrs 12 unit iii measurement of power and energy power in dc ac from chem as. Thus circuit voltage is impressed across the pc and cc carries the circuit current. The primary advantage of the electrodynamometer type meter movement is that it can be used to measure alternating as well as direct current.
Information and translations of electrodynamometer in the most comprehensive dictionary definitions resource on the web. 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. Low power factor wattmeter if an ordinary electrodynamometer wattmeter is used for measurement of power in low power factor circuits, pf pdf from eee 360 at arizona state university. 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. Hpcl instruments placement question paper sample model paper. In power transmission system and distribution system we measure power factor at every station and electrical substation using these power factor meters. Pressure coil is connected across the circuit whose power is to be measured and current coil is connected in series. The instrument whose working depends on the reaction between the magnetic field of moving and fixed coils is known as the electrodynamometer wattmeter. Electrodynamometer wattmeters these instruments are similar in design and construction to electrodynamometer type ammeters and voltmeters. 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. Encyclopedia article about electrodynamometer by the free dictionary. A damper lever is located underneath the dynamometer to prevent oscillation if the power supply is applied while the dynamometer is turning. 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.
Electrodynamometer definition of electrodynamometer by. The power factor meter measures the power factor of a transmission system. Two movable coils are also used in the electrodynamometer meter. Wattmeter, energy meter, electrostatic instruments, rectifier type instruments, extension of ranges of voltmeters and ammeters. Power factor meters electrodynamometer type power factor. Low power factor wattmeter if an ordinary electrodynamometer wattmeter is used for measurement of power in low power factor circuits, pf power supply is applied while the dynamometer is turning. Active servo softwared,gb,f,e,rubber coupling sleeve, 1kw, coupling guard, 1kw, quick chart, servomachine test stand safety and operating instructions, interactive lab assistant.
The pressure coil circuit of induction type instrument is made as inductive as possible so. 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. The two coils are connected in different circuits for measurement of power. Figure 14 3 f power factor meter schematic ground detector the ground detector is an instrument which is used to detect conductor insulation resistance to ground. 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. Electrodynamometer type instruments construction and. Powerfactor meters ppt inductor electric current scribd.
Electrodynamometer type wattmeter construction and working. The wattmeter is an instrument for measuring the electric power or the supply rate of electrical energy in watts of any given circuit. Difference between electrodynamometer wattmeter and low power. Mar 20, 2020 hpcl instruments placement question paper sample model paper.
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. 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. 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. These instruments are similar in design and construction to electrodynamometer type ammeters and voltmeters. The different types of power factor meter are explained below in details. They are used as wattmeters, voltmeters and with some modification as power factor meters and frequency meters. Threephase power measurement objective to measure power in a threephase circuit using the two wattmeter. Sep 16, 2016 as the name suggests the low power factor meter are the instruments that measures lower values of power factor accurately. The power factor is the cosine of the angle between the voltage and current. Before we study the internal construction of electrodynamometer type wattmeter, it is essential to know the working principle of electrodynamometer type wattmeter. We will discuss electrodynamometer type wattmeter working principle and its construction. They can be used in single phase, three phase three wire and three phase four wire system and are designed to be used in horizontal positions.
The power factor meter determines the types of load using on the line, and it also calculates the losses occur on it. 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. As the name suggests the low power factor meter are the instruments that measures lower values of power factor accurately. 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. T1t2r1r2no of hrs 12 unit iii measurement of power and. Electrodynamometer type wattmeter electrical study app by. The electrodynamometer movement meter has the same basic operating principle as the darsonval meter movement, except that the permanent magnet is replaced by fixed coils. If you apply alternating current to the standard galvanometer type meter, it will not produce a usable reading.
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