Function and working principle of electronic watt-hour meter

With the development of electronic technology, the standard electricity meter has also realized the transformation to digital and intelligent.

Compared with the traditional mechanical watt-hour meter, the electronic watt-hour meter has the advantages of high measurement accuracy, low power consumption, strong ability to prevent electricity theft and so on. So, how does an electronic electricity meter work? What function does it have?

What is an electronic electricity meter?

The electronic watt-hour meter adopts large-scale integrated circuit and digital sampling processing technology. The whole device is designed with a variety of anti-interference technology. It is used for time-sharing measurement of AC active power with rated frequency of 50Hz, which can better balance the grid load.

How does an electronic electricity meter work?

Function and working principle of electronic watt-hour meter

First, let's introduce the electronic electricity meter:

​electronic watt-hour meter can use Chinese liquid crystal display, with forward active energy, reverse active energy, reactive energy meter functions, can store its data, and can be set according to the combination of active power. According to the corresponding period of time, the total, peak, peak, flat, and valley electric energy are accumulated and stored respectively. ​can have event recording function, and can have infrared, 485, carrier and Bluetooth communication functions. After power failure, the liquid crystal display automatically shut down; ​after the LCD is closed, the key can be used to wake up the LCD within 2 hours, each time lasting 30 seconds. For example, the DDZY607 series single-phase cost-controlled intelligent power meter of Delisi has the above functions.

Now we will introduce the working principle of electronic electricity meter. There is a specific concept.

​electricity meter consists of two main functions: one is the electric energy measurement part, the other is the microprocessor control part. The energy meter part of the meter uses a large-scale ASIC to generate a pulse sequence indicating how much electricity is consumed, which is sent to a microprocessor for energy meter. After receiving the pulse signal, the microprocessor accumulates the number of input pulses and realizes the accurate measurement of electric energy according to the magnitude of pulse constant. It transmits data through various interfaces to realize various control functions. As shown in the picture.

At present, the precision of the metering and the power consumption and function of the control part of the electricity meter in the market do better have the pilot series of Delici products.

After introducing the working principle, then can the electronic electricity meter have what detailed functions?

1 Measurement function

1.1 With forward active energy, reverse active energy meter  function, can store its data, and can set the combination of active power.

1.2 With reactive power metering, reactive power can be measured separately in four quadrants. The reactive power can be set as the sum of any four quadrants, and the combined reactive power can be set.

1.3 With time-sharing measurement function, the active electric energy accumulates and stores the electric energy and the total electric energy in the peak, peak, flat, and valley periods, respectively.

1.4 It can store the total electric energy and each rate electric energy for at least 24 settlement days; ​the data storage demarcation time is 00:00 of the month, or on the hour between the 1st and 28th of each month.

1.5 If the settlement time is missed during power failure, complete the settlement energy data when the power is on, and make up the latest 12 times at most.

1.6 The current electrical energy can be stored in 4 decimal places, allowing the electrical energy to increase by a single pulse at a time.

2 Measurement and monitoring function

It CAN MEASURE, record and display the voltage, current (including zero-line current), power, power factor and other operating parameters of the current watT-hour meter.

3 Event Record

3.1 Permanently record the occurrence time of the electricity meter zero clearing event and the electricity energy data at the time of zero clearing.

3.2 Record the total number of programming, the last 10 programming records, operator codes, and data identification of programming items.

3.3 Record the total number of clock Settings (excluding broadcast calibration time), the time before and after the last 10 calibration times, and the operator code.

3.4 Record the total number of broadcasting hours, the time before and after the last 100 hours of broadcasting hours, and the corresponding electrical energy data.

3.5 Record the last 10 pulling and closing events, and record the occurrence time of pulling and closing events and the electrical energy.

3.6 Record the total number of meter cover opening, the occurrence and end time of the last 10 meter cover opening events, and the corresponding electrical energy data and other information; ​during a power outage, only the earliest cover opening event is recorded for an electricity meter.

4 Rate and time slot functions

4.1 12 rates such as peak, peak, flat and valley can be set arbitrarily in one day; ​a maximum of 14 time periods can be set within 24 days, and the minimum time period is 15 minutes. The time period can be set across the zero point. The Settings of each time period are arranged from the smallest to the largest.

4.2 The electricity meter has two or more sets of time tables that can be programmed at will. Each set of time tables has a maximum of 8 daily time tables, and the second set of rate time tables can be started at the set time point.

4.3 Electricity meters support the setting of special rate periods during holidays and weekdays.

4.4 Electricity meter The time table can be modified through Bluetooth, RS485, and carrier communication interfaces.

4.5 Daily Time Segment Table The value can be set based on the actual number of time segments. After the value is set, make up the subsequent time segments based on the last time segment.

5 Freezing Function

5.1 Timing Freeze: Freezes power data at the agreed time and interval. Store each frozen quantity at least 60 times.

5.2 Instantaneous freezing: freezing the current calendar, time, all electrical energy and important measurement data under abnormal conditions; ​instantaneous freezing capacity The data of the last three times is saved.

5.3 Agreed freezing: When the new and old rates/time periods are converted or the power company thinks there is a special need, the electric energy and other important data at the conversion time will be frozen.

5.4 Daily freezing: Storage of electrical energy at midnight every day, which can store data for 254 days.

5.5 Monthly freezing: The total power and power data of each rate at midnight of the first day of each month can be stored for 24 times.

5.6 Freezing at the hour: The total active energy at the hour or the half hour can be stored and 254 data can be stored.

​electronic watt-hour meter has many functions and large storage of data. Users can screen the functions according to their own needs. At present, there is a wide variety of meters on the market, and the quality is uneven. The choice of big brands is the priority option. If you have more detailed and personalized use needs, you can also choose some big brands such as Deli Electric, for smart meter function customization.

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