Induction type watthour meter electrical engineering. Pdf testing of energy meters under threephase determined. Electronic energy meters are accurate, precise and reliable type of measuring instruments when compared to electromechanical induction type meters. Single and three phase wattmeters and energy meters. Note down the reading of two meters in a given period of time, say 2 minutes. The operation of induction type energy meter depends on the passage of alternating current through two suitably located coils producing rotating magnetic field which interacts with a metallic disc suspended near to the coils and cause the disc to rotate.
An electricity meter, electric meter, electrical meter, or energy meter is a device that measures the amount of electric energy consumed by a residence, a business, or an electrically power devive. Types of electricity meters and precision classification. The most common type of electricity meter is still the electromechanical induction watt. Im transform electrical energy into mechanical energy.
Here we discuss the construction and working principle of induction type energy meter. Therefore, this type of meter is also called an integrating meter. Which is known as the general expression for the deflecting torque in the induction type meters. Calibration and testing of singlephase energy meter. Energy management, revenue metering and power quality monitoring. It uses ad7755, a singlephase energy measurement ic to acquire and process the. Single phase induction type energy meter is also popularly known as watthour meter. There are four main parts of the operating mechanism of single phase induction type. Thus we need an integrating instrument which can measure and record the energy consumed by the load under varying load condition.
Energy is total power delivered or consumed over a time interval, energy power x time. It is used in domestic and industrial ac circuit for measuring the power consumption. The energy measurements are done by combining the five entities. Single phase induction meters are very popular for domestic and industrial use because of its wide application as energy meter. It comprises a rotating aluminum disc placed on a spindle between two electromagnets. Additionally, transformers are able to send alternating currents from one electric circuit to another by means of electromagnet induction. Single phase induction type energy meters electrical. Electrical energy developed as work or dissipated as heat over an interval time t. Moreover, it may be used combining two or more meters. About electromegnet induction type energy meter in electromegnet induction type energy meter why the rotating alluminium disk is perforated. It consists of two electromagnets, called shunt magnet and series magnet, of laminated construction. Pdf study of active electric energy meters behavior of. The copper shading bands are also called the power factor compensator or compensating loop. An electricity meter, electric meter, electrical meter, or energy meter is a device that measures.
Procedure for calibration and testing of singlephase energy meter. Driving system moving system breaking system registering system 2. Handbook on electricity meters asiapacific economic cooperation. The principle of working and construction of induction type meter is very simple. This alternator type of device is the same one that is used in vehicles to produce a consistent stream of energy. The series electromagnet is energized and sets up a magnetic field cutting through the rotating disc, when load current flows through the current coil c. The meter which is used for measuring the power of three phase supply is known as the three phase energy meter.
The construction and principle of operation of single phase energy meters is explained below. When the energy meter is connected in the circuit, the current coil carries the load current and the pressure coil carries the current proportional to the supply voltage. This is used in each and every house and industry for calculating the energy consumed by them. Electromechanical meters the electromechanical induction meter operates by counting the revolutions of an aluminium disc which is made to rotate at a speed proportional to the power. The electronic energy meter is also better protected against tampering than its mechanical predecessor, and units for prepaid operation e. However, it differs from induction ammeter or voltmeter in so far that separate two coils are used to produced the.
If you understand the way the threephase motor operates, you will have no problem understanding the working principle of a phase rotation meter. The rotation speed of the disc is proportional to the power, and this power is integrated by the use of gear trains and counter mechanism. Energy is an integrating type of instrument used for measurement of energy in domestic and industrial ac circuits. Dynamometer type wattmeter electrical technology youtube. This will be converted into corresponding measurements in the display section. In this page you can learn various important energy meter multiple choice questions answers,mcq on energy meter with answers,mcq on energy meter,sloved energy meter objective questions answers, energy meter multiple choice questions answers etc. Once the mercury pool was exhausted, the meter became an open circuit.
They are typically calibrated in billing units, the most common one being the kilowatt hour kwh. It consists of rotating aluminum disc mounted on a spindle between two electro magnets. Overview of single phase induction type energy meter. The energy is the total power consumed and utilised by the load at a particular interval of time. In an induction type meter, creep is a phenomenon that can adversely affect accuracy, that occurs when the meter disc rotates continuously with. This maxim from the english mathematician and philosopher alfred north whitehead 18911947 perfectly applies to the history of the electricity meter, perfected through a series of inventions building on achievements and stimulating further development. Single phase electromechanical induction energy meter.
It is used everywhere, no matter how big or small consumption it is. Pl explain 3 phase energy meter working principle and how can reduce. What are the advantages and disadvantages of usual energy meters. Induction type energy meter essentially consists of following components. If a meter is used in combination with a current transformer. The principle of operation of an induction wattmeter is same as that of induction ammeters and voltmeters i. An energy meter is used to measure the energy consumed in the kilowatt hours. In this paper, an experimental investigation has been carried out to analyze the performance of singlephase watthour induction and electronic types energy meters that are being used in pakistan. Induction type measuring instrument energy meter 1. Induction type energy meter used invariably to measure the energy consumed in any a.
What is the solution for the drawbacks of commonly used energy meters. Induction type energy meter it is the popularly known and most common type of age old watt hour meter. The simplest such instrument is single phase induction type energy meter. Electrical energy is measured in kilo watthours kwh by this energy meter. Single phase induction type energy meter construction,working principle,operation,creeping,torque equation the measurement of energy is the same process as measurement of power except that the instrument not merely indicates the power or rate of supply of energy but must take into account also the length of time for which the rate of energy is continued. Some of the common errors in energy meter and their remedial measures are discussed below. I have a 43 watt light bulb connected for the load in the picture which is showing 44 watts. There are several types of energy meters single phase induction type energy meter are very commonly used to measure electrical energy consumed in domestic and commercial installation. A induction machine can be used as either a induction generator or a induction motor.
Analysis of present state of the digital power meter field calibration. So, electronic type of threephase energy meter is explained below with its working principle. The number of revolutions is thus proportional to the energy usage. The great invention of the nineteenth century was the method of invention. The conventional mechanical energy meter is based on the phenomenon of magnetic induction. Give the connections as per the circuit diagram above. Energy is the product of power and time for which power is used i. It is a wellknown and most common type of ageold energy meter. When the energy meter is connected in the circuit, the current coil carries the load current and the pressure coil carries the current proportional to.
Direct metering of neutral circuit and calculated ground current value to avoid overload and. There are four main parts of the operating mechanism i driving system ii moving system iii braking system. Now there are two types of induction meters and they are written as follows. Pdf electric energy meters are designed to account energy under. C to the pressure coil circuit by means of phase shifting transformer. An electricity meter, electric meter, electrical meter, or energy meter is a device that measures the amount of electric energy consumed by a residence, a business, or an electrically powered device electric utilities use electric meters installed at customers premises for billing purposes. The three phase meter is constructed by connecting the two single phase meter through the shaft. The meter which is used for measuring the energy utilises by the electric load is known as the energy meter. Working on a 240v meter in a box which i will have done soon to test my amateur radio linear amplifier. Im is a type of asynchronous ac motor where power is supplied to the rotating device by means of electromagnetic induction. The below figure shows the watthour meter circuit implemented by using atmel avr. This interface is used exclusively for joining the 20xrfc daughter card to the. Energy meter is an integrating instrument which measures the total quantity of electrical energy.
Drm121, mqxenabled mcf51em256 singlephase electricity meter. In addition to the types of meter described above which directly measure the amount of energy used, other types of meter are available. Induction meter includes types such as induction voltmeters, induction ammeters and induction watthour meters. Ecostruxure for your business ecostruxure lets you thrive in todays digital world. Study of single phase induction type energy meter or watt. Energy meter an energy meter is a device that measures the amount of electrical energy consumed by a residence, business, or an electrically powered device. The movement in the energy meter development is moving in the forward direction and has come a long way towards a loss free and a hassle free energy usage across the world. Combine alarms using boolean logic and to create alarm levels. A 3phase energy meter has same elements as in case of a singlephase energy meter. Energy meter is an integrating instrument which measures the total quantity of electrical energy supplied to the circuit in given period. Working of single phase induction type energy meter the basic working of single phase induction type energy meter is only focused on two mechanisms. What is an energy meter and what are the basic types of. When connected to loads, they consume less power and start measuring instantaneous. Rotating type the phase rotation meter works on the same principle as induction motors.
The series electromagnet is energized by a coil, known. Induction type energy meter ii electrical technology ii unit 3 duration. Type c solid core current transformer cable profile. Westinghouse induction type overcurrent and directional overcurrent relays fig. Electrical energy meters principles and applications. Energy meter multiple choice questions mcq and answers. Here we are going to discuss about the single phase induction type in detail. Induction type energy meter ii electrical technology ii unit 3 s. Principle of operation of a induction kwhr energy meter. Design and implementation of a highfidelity ac metering network. Dinrail energy meters for singlephase circuits up to 63a. Operating principle of single phase induction type energy meter.
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