Types of Energy Meters
Energy Meters are devices that measure the amount of electricity being used in an area. They allow buildings and businesses to record their energy consumption and to know the overall cost of electricity. These meters can also help identify areas for energy savings and to improve the efficiency of electrical assets.
Electricity meters are electromechanical devices that read voltage and current to determine the energy used (in joules, kilowatt-hours, etc.). They are commonly located in line with service conductors, though meters for larger loads may be connected to power-supply transformers to be located somewhere other than in line with the supply.
There are several types of electric meters, ranging from simple plug-in meters that only measure the consumption of an individual appliance to sophisticated smart meters that use wireless technologies to send meter readings to your energy supplier at frequent intervals. Smart meters can also alert you when there is a power outage in your area, helping to keep your home safe.
The basic electromechanical watt-hour meter is like a small motor that operates at a speed proportional to the power passing through it. There are two sets of coils one for potential flux interaction with the meter disc or rotor and one for current flux interaction, and a series of gears that move a set of dials on the meter register.
Another type of meter is an induction watt-hour meter that uses electromagnetic induction to measure energy. It consists of a non-magnetic, but electrically conductive metal disc that is made to rotate at a speed proportional to the amount of power passed through it. This number of revolutions is then used to calculate the watt-hours that have been used in the meter.
A third type of meter is an induction current meter that combines the power measurement capabilities of the previous two types. It consists of a metal disc that is made to rotate at alternating speeds proportional to the amount of current flowing through it. The meter uses a relay that changes state with each full or half rotation of the disc, allowing it to calculate the kW and kWh of the meter.
Induction watt-hour meters are more complex than the previous two types, but still relatively straightforward to design. They use a non-magnetic, but electricity-conductive metal disc that is made to rotate at an alternating speed proportional to the amount of power that passes through it. The meter uses a series of gears that change the revolutions of the disc to calculate the watt-hours that are being used in the meter.
Digital Energy Meters are electronic meters that are designed to be more accurate than mechanical meters. They have a range of sensors that detect electrical flow from the grid into your house and then use an analog-to-digital converter (ADC) to convert these measurements into a digital signal.
These meters are typically used to monitor a commercial, industrial, or domestic electricity supply and can be installed in remote locations. They can be operated with a handheld controller or a PC or tablet computer, and are often used to monitor the energy usage of multiple loads within a single building.