5 Types of Electric Energy Meters Based on Power Supply Methods
Electric energy meters are instruments used to measure electric energy, also known as an electric watt-hour meter, a fire meter, or kilowatt-hour meter.
Electric energy metering is an important link in the production and operation activities of electric power enterprises and the safe operation of power grids. Trade settlement and assessment of economic and technical indicators of the power system must rely on accurate and complete electric energy metering devices. The performance and management level of electric energy meters are not only related to the development of the electric power industry and the image of electric power enterprises, but also affect the accuracy and fairness of trade settlement, and involve the fundamental interests of the majority of electric power customers.
For ordinary people, electric energy meters are both familiar and unfamiliar. They all know that electric energy meters are useful in their homes, but most people have never cared about these electric energy meters. There are many types of energy meters, and different countries and regions have their own requirements.
This article will introduce the types of energy meters from the perspective of power supply methods.
Single-phase two-wire watt-hour meter, referred to as single-phase watt-hour meter (220V or 110V), live line L, neutral line N, the voltage between live line and neutral line is 220V~230V in 4/5 countries in the world, and 110V in some countries, such as the United States and Japan. Single-phase electric energy meters are used to measure and charge electricity for residential users. It has a large volume and a wide range, which is directly related to the interests of thousands of households, and is also related to the stable and safe operation of the power sector.
Single-phase three-wire watt-hour meter (120/240V), 2 live wires L, 1 neutral wire N, 120V between the neutral wire and the live wire, and 240V between the live wire and the live wire; Philippines, Japan, and Taiwan all use single-phase three-wire Energy Meter.
Two-phase three-wire watt-hour meter (2*120/208V), 2 live wires, 1 neutral wire, 120V between the neutral wire and the live wire, and 208V between the live wire and the live wire; South America will use a two-phase three-wire watt-hour meter.
Three-phase three-wire watt-hour meter (3*100V), 3 live wires without neutral wire, delta connection, 100V between live wires, used for power generation, transmission, and high voltage side of power transformation, PT and CT is required for use.
Three-phase four-wire watt-hour meter, referred to as single-phase watt-hour meter (3*220/380V), 3 live wires, 1 neutral wire, star connection, 220V between the neutral wire and the live wire, 380V between the live wire and the live wire; It is mostly used for industrial power consumption or large user power consumption.
DC energy meters are mostly used in new energy power generation, telecommunication base stations, subways, DC charging piles, and other applications. With the development of new energy power generation and electric vehicles, the consumption of DC energy meters is also growing rapidly.
Although the electric energy meter is small, it is a metering product related to people’s livelihood, so it has high requirements for it. With the advancement of science and technology, the manufacturing and design level of the electric energy meter has also been continuously improved. Various types of energy meters (prepaid, multi-rate), smart meters, etc., are to meet the growing market demand.