FREQUENTLY ASKED QUESTIONS
1. What is an electricity meter?
An electricity meter is a mechanical or electronic measuring device that records the electrical energy generated or consumed by an installation. It may be connected to the main supply in homes and workplaces, or directly to a device or system when individual consumption must be monitored.
2. What types of electricity meters are available?
Meters are classified as direct-connected or instrument-transformer-connected. Direct-connected models are used up to approximately 120 A. For higher currents, an X/5 A current-transformer connection is preferred. They are also classified as single-phase or three-phase, and as active-energy or active-reactive (combi) meters.
3. What does demand mean on an electricity meter?
Demand is the highest average active power calculated during a defined measurement interval, commonly 15 minutes, and recorded in kW. It is not instantaneous power; it helps evaluate peak power requirements and how closely consumption approaches the contracted power limit.
4. What is contracted power?
Contracted power is the maximum power accepted for use under the electricity subscription agreement. Maximum-demand records allow actual use to be compared with this limit and help ensure that the connection capacity is correctly planned.
5. How do electronic electricity meters measure energy?
Current and voltage are sampled rapidly and simultaneously through a measuring resistor or current transformer. A microcontroller calculates power from these signals and integrates it over time to determine electrical energy. Results are recorded in Wh, kWh or, for high-consumption installations, MWh.
6. What is inside an electricity meter?
A mechanical meter uses a mechanical register. An electronic meter includes an LCD, measurement circuit, processor, memory, real-time clock and, depending on the model, communication interfaces. Its display button can show total energy consumption, power, time, date and other supported parameters.
7. How is an electricity meter read?
Mechanical meters are read locally from the front register. Electronic meters can be read from the LCD and, on supported models, through the optical port with a reader such as Optus or remotely over RS485 using a suitable modem or gateway such as Wport24 or E Port. USOBIM collects consumption, status and notification data from multiple meters at a central point.
Source: Adapted from the technical explanations on Makel’s Electronic Electricity Meters page.
END-TO-END METERING WITH ARET ENGINEERING
Aret Engineering provides end-to-end planning for meter selection, measurement architecture, RS485/Ethernet/2G–4G communication, Optus field reading, Wport24/E Port integration and USOBIM commissioning across residential, commercial, hotel and industrial projects.