The electronic energy meter
adopts large-scale integrated circuits and digital sampling processing technology. The whole machine is designed with a variety of anti-interference technologies. It is used for time-sharing measurement of AC active energy with rated frequency of 50Hz, which can better balance the grid load. The electronic watt-hour meter can be displayed with Chinese LCD, and has the function of measuring positive active energy, negative active energy and reactive energy. It can store its data and set the combined active power accordingly. Active electric energy accumulates and stores total, peak, peak, flat and valley electric energy according to corresponding time periods. It can have event recording function, and can have infrared, 485, carrier and Bluetooth communication functions. After power failure, the LCD will turn off automatically; After the LCD is turned off, the LCD can be waked up by pressing the key within 2 hours, lasting for 30 seconds each time. For example, Delixi's DDZY607 series single-phase charge-controlled smart electric energy meter has both the above functions. Now let's introduce the working principle of electronic watt-hour meter, and we have a specific concept. The electric energy meter consists of two main functions: one is the electric energy metering part, and the other is the microprocessor control part. The electric energy metering part of the electric energy meter uses large-scale dedicated integrated circuits to generate a pulse sequence indicating how much electricity is used and send it to the microprocessor for electric energy metering. After receiving the pulse signal, the microprocessor accumulates the number of input pulses, accurately measures the electric energy according to the pulse constant, and transfers data through various interfaces to achieve various control functions.
1 Metering function
1.1 It has the function of measuring positive active electric energy and negative active electric energy, can store its data, and can set combined active power accordingly.
1.2 With reactive energy metering, the four quadrants of reactive power can be measured separately. The reactive energy can be set as the sum of any four quadrant quantities, and the combined reactive energy can be set.
1.3 With time-sharing metering function, active electric energy accumulates and stores electric energy and total electric energy at peak, peak, flat and valley periods respectively.
1.4 It shall be able to store the total electric energy and electric energy at various rates for at least 24 accounting days; The dividing time of data storage is 0:00 at the beginning of the month, or the hour from the 1st to the 28th of each month.
1.5 If the settlement time is missed during the power failure, the settlement energy data shall be supplemented when the power is on, and the most recent 12 times shall be supplemented.
1.6 The current electric energy supports 4-digit decimal storage, allowing the decimal part to increase according to the electric energy represented by a single pulse each 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 electric energy meter.
3 Event record
3.1 Permanently record the occurrence time of the reset event of the electric energy meter and the electric energy data at the time of the reset.
3.2 Record the total number of programming times, the last 10 programming records, operator code, and data identification of programming items.
3.3 Record the total number of clock settings (excluding broadcast time calibration), the time before and after the last 10 times of time calibration, and the operator code.
3.4 Record the total times of broadcasting time calibration, the time before and after the last 100 times of time calibration, and the corresponding electric energy data.
3.5 Record the last 10 times of opening and closing events, and record the time of opening and closing events, electric energy and other data.
3.6 Record the total times of meter cover opening, the occurrence and end time of the last 10 meter cover opening events, as well as the corresponding electric energy data and other information; During the power outage, the electric energy meter only records the earliest event of opening the meter cover.
4 Rate and period function
4.1 Within one day, 12 rates can be set arbitrarily, including peak, peak, flat and valley rates; A maximum of 14 time periods can be set within 24 hours, and the minimum time period is 15min, which can be set across zero points. The settings of each time period are arranged from small to large.
4.2 The electric energy meter has two or more sets of time interval tables that can be programmed at will. Each set of time interval can have up to 8 daily time interval tables, and the second set of rate time interval can be started at the set time point.
4.3 The electricity meter supports the setting of special rate periods on holidays and weekends.
4.4 The electric energy meter supports modifying the time table through Bluetooth, RS485, carrier and other communication interfaces.