What is the function and working principle of electronic watt-hour meter
The electronic watt-hour meter adopts large-scale integrated circuit and digital sampling processing technology. The whole machine adopts a variety of anti-jamming technology design. It is used for time-of-use metering of AC active energy with a rated frequency of 50Hz, which can better balance the grid load. The electronic watt-hour meter can be displayed in Chinese liquid crystal, 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. The active energy stores the total, peak, peak, flat, and valley energy according to the corresponding time period. It can have event recording function, and can have infrared, 485, carrier, bluetooth communication functions. After power failure, the LCD will automatically turn off; after the LCD is turned off, the LCD can be woken up by pressing the button within 2 hours, each time lasting 30 seconds. For example, Delixi's DDZY607 series single-phase load-controlled smart energy meters have the above two functions. Now let's introduce the working principle of the electronic energy meter, and have a specific concept. The electric energy meter is composed of two main functions: one is the electric energy measurement part, and the other is the microprocessor control part. The energy measurement part of the electric energy meter adopts a large-scale application-specific integrated circuit to generate a pulse sequence indicating the amount of electricity consumption, and send it to the microprocessor for energy measurement. After the microprocessor receives the pulse signal, it accumulates the number of input pulses,
1 Metering function
1.1 It has the function of measuring positive active energy and negative active energy, can store its data, and can set the combined active power accordingly.
1.2 It has the function of reactive energy measurement, which can measure four quadrants of reactive power respectively. The reactive electric energy can be set as the sum of any four quadrants, and the synthetic reactive electric energy can be set.
1.3 It has a time-of-use metering function, and the active electric energy accumulates and stores electric energy and total electric energy during the peak, peak, flat, and valley periods respectively.
1.4 It should be able to store the total electric energy and electric energy of various rates for at least 24 accounting days; the division 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 a power outage, the settlement energy data needs to be supplemented when the power is turned on, and the last 12 supplements have been made.
1.6 The current electric energy supports 4-digit decimal storage, allowing the decimal part to increase according to the electric energy represented by each single pulse.
2 Measurement and monitoring functions
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 log
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 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 correction), the time before and after the last 10 time corrections, and the operator code.
3.4 Record the total number of broadcast time calibrations, the time before and after the last 100 time calibrations, and the corresponding power data.
3.5 Record the last 10 opening and closing events, record the opening and closing event time, electric energy and other data.
3.6 Record the total number of meter openings, the occurrence and end time of the last 10 meter opening events, and the corresponding power data and other information; during a power outage, the electric energy meter only records the earliest event of opening the meter cover.
4 Interest rates and periodic functions
4.1 12 tariffs can be set arbitrarily within a day, including peak, peak, flat and valley tariffs; up to 14 time periods can be set within 24 hours, the minimum time period is 15 minutes, and can be set across zero. The settings of each time period are arranged from small to large.
4.2 The energy meter has two or more time interval tables, which can be programmed arbitrarily. Each set of time intervals can have up to 8 daily time interval tables, and a second set of rate intervals can start at a set point in time.
4.3 The electric meter supports setting holidays and weekend special price periods.
4.4 The energy meter supports modifying the schedule through communication interfaces such as Bluetooth, RS485, and carrier.
4.5 The daily time slot table supports setting according to the actual number of time slots. After the setting is successful, subsequent time periods will be supplemented according to the time period of the last day.
