Check our new membership plans and prices! Single phase induction type energy meter is also popularly known as watt-hour meter.
Types of Energy Meters and Their Working Principles
This name is given to it. This article is only focused about its constructional features and its working. Induction type energy meter essentially consists of following components:. Driving system 2.
Moving system 3. Braking system and 4. Registering system. A coil having large number of turns of fine wire is wound on the middle limb of the shunt magnet.
This voltage coil has many turns and is arranged to be as highly inductive as possible. In other words, the voltage coil produces a high ratio of inductance to resistance. An adjustable copper shading rings are provided on the central limb of the shunt magnet to make the phase angle displacement between magnetic field set up by shunt magnet and supply voltage is approximately 90 degree. The copper shading bands are also called the power factor compensator or compensating loop.
The flux produced by this magnet is proportional to, and in phase with the load current.
Types of Energy Meters
The moving system essentially consists of a light rotating aluminium disk mounted on a vertical spindle or shaft. The shaft that supports the aluminium disk is connected by a gear arrangement to the clock mechanism on the front of the meter to provide information that consumed energy by the load.
The time varying sinusoidal fluxes produced by shunt and series magnet induce eddy currents in the aluminium disc. The number of rotations of the disk is therefore proportional to the energy consumed by the load in a certain time interval and is commonly measured in kilowatt-hours Kwh.
Damping of the disk is provided by a small permanent magnet , located diametrically opposite to the a. The disk passes between the magnet gaps.
The movement of rotating disc through the magnetic field crossing the air gap sets up eddy currents in the disc that reacts with the magnetic field and exerts a braking torque. By changing the position of the brake magnet or diverting some of the flux there form, the speed of the rotating disc can be controlled. The registering or counting system essentially consists of gear train, driven either by worm or pinion gear on the disc shaft, which turns pointers that indicate on dials the number of times the disc has turned.
The energy meter thus determines and adds together or integrates all the instantaneous power values so that total energy used over a period is thus known. Lets have a look over these mechanism in few words:. Which is made to rotate at a speed proportional to the power. The metallic disc is acted upon by two coils. One coil is connected 0r arranged in such a way that it produces a magnetic flux in proportion to the voltage and the other produces a magnetic flux in proportion to the current.
The field of the voltage coil is delayed by 90 degrees using a lag coil.
Working of Single phase induction type Energy Meter
A permanent magnet exerts an opposing force proportional to the speed of rotation of the disc — this acts as a brake which causes the disc to stop spinning when power stops being drawn rather than allowing it to spin faster and faster. This causes the disc to rotate at a speed proportional to the power being used.
MICROCONTROLLER BASED SINGLE PHASE DIGITAL ENERGY METER SIMULATION ON LABVIEW
Based on number of rotation of aluminum disc. The aluminum disc is supported by a spindle which has a worm gear which drives the register.
The register is a series of dials which record the amount of energy used. The dials may be of the cyclometer type, an odometer-like display that is easy to read where for each dial a single digit is shown through a window in the face of the meter, or of the pointer type where a pointer indicates each digit.
It should be noted that with the dial pointer type, adjacent pointers generally rotate in opposite directions due to the gearing mechanism. If the permanent magnet move towards the aluminium disc the speed of disc will increase or decrease. Good morning everyone, if you connected three energy kWh meters class 2 on a say consuming circuit that will run maybe 21 days, what is the expected kWh readings between each one of them.
It is also theoretically unaffected by non linearity. What will happen if the current direction reverses in energy meter? Is it possible that meter starts rotating in reverse direction? The answer to your question is yes. In a typical residential, single phase meter Form 2S type the upper two lugs are connected to utility source and lower lugs are connected to the house branch circuit panel.
If the meter is inserted in the socket upside down, it will in fact rotate backward and subtract apparent energy usage from the register. If installed upside down, a meter with a detent will simply not turn at all. Prior to that, an electrochemical technique using electrolytic cells were sometimes used that required weighing the migration of a metal, such as zinc or mercury, from anode to cathode.
Another method used Kelvin heating but I am not sure how this worked.
Single phase digital energy meter pdf to word
These techniques were purported to be labor intensive as well as inaccurate. Modern, Shallenberger type meters are extremely accurate if applied correctly. This is a non-North American meter since it is 50 Hz. I am from the U.
Assuming this the case, this meter is rated for nominally 10 amperes, or a maximum of 20 amperes for rated metering accuracy. If I have this correct, in the U. Current transformers are required in the main service wires, to scale the large current down to much lower current value, nominally 5 amperes. Is this right?
I am looking to design an eddy current drive for a truck wheel that is still mounted on its hub or axle and suspended in air as in a situation to change the tire. The idea is simple. The supply voltage is single phase; or V, 3 phase.
Search for:. Premium Membership. More Information. Single-phase induction kilowatt hour meter Single phase induction type energy meter is also popularly known as watt-hour meter.
1-Phase Power Meter Catalog
This causes the current and therefore the flux, to lag the supply voltage by nearly 90 degree. The interaction between these two magnetic fields and eddy currents set up a driving torque in the disc. This produces eddy currents in the disc and the effect is such that a force is exerted on the disc in proportion to the product of the instantaneous current and voltage.
Related EEP's content with sponsored links.
1-Phase Power Meter
It helps you to shape up your technical skills in your everyday life as an electrical engineer. Saiful Islam Apr 17, Leave a Comment Cancel Reply. Subscribe to Weekly Digest Get email alert whenever we publish new electrical guides and articles. The content is copyrighted to EEP and may not be reproduced on other websites. Facebook Linkedin Linkedin Twitter.