Principle wem monitors the energy consumption for a single phase supply. The file may be stored either in the same directory as the mtr file meter file option or in a f ixed. Electronic meters consists of current and voltage sensors which sense the amount of current and voltage consumed and this analog signal is sampled and digitized using adcs. A rotating object can be a ceiling fan,it can be a car tyre etc. These meters digitally measure the energy and other factors like voltage, current, instantaneous power and show them on a lcd.
A single phase microcontroller based energy meter conference paper pdf available in conference record ieee instrumentation and measurement technology conference 2. How electronic energy meter works mohans electronics blog. Presentations ppt, key, pdf logging in or signing up. It is mainly used for robust applications as it is known for its durability and is very economical. Electronic energy meter industrial applications vishay. Energy meters are the basic part to measure the power consumption. The true power divided by the apparent voltamperes va is the power factor.
The voltage and current singles are received from pt and ct respectively. Types of energy meters and their working principles. As in the block diagram, the meter has a power supply, a metering engine, a processing and communication engine i. Automatic meter reading and theft control system by using. Digital energy meters by the millions analog devices. Vibrating tube densitometers working principle one of the many parameters that must be accurately measured for product quality control, custody transfer, process control, or liquid interface detection purposes is liquid density. As the name implies, it consists of an orifice plate which is the basic. Energy meter circuit detailed project with source code. It enables systematic pricing of energy consumed by individual consumer as it measures the amount of electrical energy consumed by a residence, business, or an electrically powered device 1. 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 and monitoring purposes. The principle of working of static abt meter is sampling. They are typically calibrated in billing units, the most common one being the kilowatt. It enables systematic pricing of energy consumed by individual consumer as it measures the amount of electrical energy consumed by a residence, business, or.
The reading in kwh is obtained by multiply the number of rotations of the disc with the meter. 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. Here we discuss the construction and working principle of induction type energy meter. An electric meter or energy meter is an essential device that goes with consumption of commercially distributed energy. In the release condition, pulse output potential is equal to 0. Digital multimeter working a digital multimeter dmm is an instrument that can measure several basic electrical quantities and shows the measurement with a number in a display.
Automatic meter reading and theft control system by using gsm p. Induction type energy meter used invariably to measure the energy consumed in any a. There are several adc available in the market, but we. Electrical energy meters principles and applications. The block diagram of a simple digital voltmeter is shown in the figure.
Digital meters are introduced, as are types of voltmeters and ammeters operating on different techniques of analogtodigital signal converters. The basic principles here apply equally to polyphase circuits. As shown in the above figure, the wattmeter has two sets of coils. Digital energy meters are the 2 nd generation of energy meters. Calculate the number of revolutions made by it, when connected to a load carrying 40 a at 230v and 0. Principle of working of abt meter the energy is recorded in terms of pulses per kwh. This application report has the complete metrology source code provided as a zip file.
If one uses one kilowatt in onehour duration, one unit of energy gets consumed. When used in electricity retailing, the utilities record the values measured by these meters to generate an invoice for the electricity. It is used in domestic and industrial ac circuit for measuring the power. A density meter, also known as a densimeter, is a device that measures the density. The basic unit of power is watts and it is measured by using a watt meter. Design and hardware implementation of a digital wattmeter. They can store energy consumption data up to 2 years in eeprom. To the other terminal of the gate, a pulse of 1 sec is applied as shown in the fig. So energy meters measure the rapid voltage and currents, calculate their product and give instantaneous power. A modern digital electronic wattmeter energy meter samples the voltage and current thousands of times a second. The average of the instantaneous voltage multiplied by the current is the true power.
What is the differance between digital energy meter. A typical multimeter may include features such as the ability to measure. Seethalakshmi2 1 school of computing, sastra university, tamil nadu, india 2professor, school of computing, sastra university, tamil nadu, india 1 rakesh. Energy meter or watthour meter is an electrical instrument that measures the amount of electrical energy used by the consumers. The electronic energy meter is also better protected against tampering than its mechanical predecessor, and units for prepaid operation e. The three phase meter is constructed by connecting the two single phase meter through the shaft. The digital signals are then processed using a dsp or a microcontroller, which then displays the amount of energy consumed on a lcd or a led display. Digital multimeter working principle analyse a meter. Digital voltmeter is the basic instrument used for measurement of voltage through the use of analog to digital converter. According to this principle, when a conductive medium passes through a magnetic field b, a voltage e is generated which is proportional to the velocity v of the medium, the density of the magnetic field and the length of the conductor.
To calculate power utilization, cost in a home and display its values, and also implement the prepaid card system using embedded system technology and also display using lcd. An electric meter or energy meter is a device that measures the amount of electrical energy supplied to or produced by a residence, business or machine. Implementation of a singlephase electronic watthour. The advantages of highly functional threephase meters for digital energy measurement have been demonstrated in north americas commercial and industrial. The rotation of this disk is base of energy measurement 8. The samples of these signal at a particular instant are collected by sample and hold circuit.
It is used everywhere, no matter how big or small consumption it is. This device is available in a purely electronic form too which is known as digital wattmeter. T he digital household energy meter had been configured as the view er of the. Microcontroller based wireless energy meter working. But these are now being gradually replaced by electronic digital energy meters. The signal waveform whose frequency is to be measured is converted into tngger pulses and applied continuously to one terminal of an and gate. Energy meter is an integrating instrument which measures the total quantity of electrical energy supplied to the circuit in given period. Principle of magnetic flow meter based on faradays law. Pdf a single phase microcontroller based energy meter. The basic principle behind digital multimeters is the analog to digital converter because without this we are not able to convert the analog output into digital form. Abt meters electrical substation analog to digital. Digital energy meters came in single phase and 3 phase both types.
The width and frequency of the rectangular pulse is controlled by the digital circuitry inside the. Electromechanical energy meters have been the standard for metering the electricity since billing began. It involve four steps in its working driving force moving system breaking system registering system 7. Magnetic flow meters works based on faradays law of electromagnetic induction. So the eem is known as static energy meter in eem the accurate functioning is controlled by a specially designed ic called asic application specified integrated circuit. Energy meter working principle and construction electronic. The construction of the single phase energy meter is shown in the figure. So, electronic type of threephase energy meter is explained below with its working principle. A multimeter ora multitester, also known as a voltohm meter or vom is, an. The total energy is the sum of the reading of both the elements. Design and implementation of wireless energy meter system. All multimeters measure ac and dc voltage voltmeter, ac and dc current ammeter, and resistance ohmmeter. It uses digital, analog or both techniques to generate a rectangular pulse. 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.
A list of some manufacturers of electronic voltmeters, ammeters, and oscilloscopes is. The meter which is used for measuring the power of three phase supply is known as the three phase energy meter. Handbook on electricity meters asiapacific economic cooperation. Energy is the product of current and voltagein the case of 3 phase supply power factor must be considered. The electricity consumption meter shown in the figure facilitates the billing of energy meter along with load control using wireless gsm technology. Pdf the energy metering technology used presently in nigeria is not highly. Electronic energy meter is based on digital micro technology dmt and uses no moving parts. Working principle and construction of energy meter video lecture of measurement of capacitance chapter in subject electronic. Some meters measured only the length of time for which charge flowed, with no measurement of the magnitude of voltage or current. Presented here is a simple energy meter using analog devices ade7757 chip for singlephase, 2wire phase and neutral systems used in households. This is a microcontroller based wireless energy meter, as 8051 microcontroller is used for controlling the entire system. Simultaneously, watt readings using a standard commercially available analogue wattmeter were also taken.
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